##### Table of Contents





SECURITIES AND EXCHANGE
COMMISSION

Washington, D.C. 20549

FORM 20-F

(Mark One)

|   |  |                                                                                               
|-- |  | ----------------------------------------------------------------------------------------------
| ̈  |  | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934
|  
|OR
|   | 
|þ  |  | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934          
|   | 
|   |  | For the fiscal year ended 31 March 2013                                                       
|  
|OR
|   | 
| ̈  |  | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934      
|  
|OR
|   | 
| ̈  |  | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934   
|   | 
|   |  | Date of event requiring this shell company
report                                             
|   | 
|   |  | For the transition period from  to                                                            

Commission file number: 001-14958

NATIONAL GRID PLC

(Exact name of Registrant as specified in its charter)

England and Wales

(Jurisdiction of incorporation or organization)

1-3 Strand, London WC2N 5EH, England

(Address of principal executive offices)

Alison Kay

011 44 20 7004 3000

Facsimile No. 011 44 20 7004 3004

Group General Counsel and Company
Secretary

National Grid plc

1-3 Strand London WC2N 5EH, England

(Name, Telephone, E-mail and/or
Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to
Section 12(b) of the Securities Exchange Act of 1934:



|                                                   |  |                                          
|-------------------------------------------------- |  | -----------------------------------------
|Title of each class                                |  | Name of each exchange on which registered
|Ordinary Shares of 11 17/43 pence each             |  | The New York Stock Exchange*             
|American Depositary Shares, each representing five |  | The New York Stock Exchange              
|Ordinary Shares of 11 17/43 pence each             |  |                                          
|6.625% Guaranteed Notes due 2018                   |  | The New York Stock Exchange              
|6.30% Guaranteed Notes due 2016                    |  | The New York Stock Exchange              
|Preferred Stock ($100 par value-cumulative):       |  |                                          
|3.90% Series                                       |  | The New York Stock Exchange              
|3.60% Series                                       |  | The New York Stock Exchange              





| | * | Not for trading, but only in connection with the registration of American Depositary Shares representing Ordinary Shares pursuant to the requirements of the Securities
and Exchange Commission.
| | - | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------



Securities registered or to be registered pursuant to Section 12(g) of the Securities Exchange Act of 1934:None.

Securities for which there is a reporting obligation pursuant to Section15(d) of the Securities Exchange Act of
1934:None.

The number of outstanding shares of each of the issuers classes of capital or common stock as of
March 31, 2013 was

|                                       |  |              
|-------------------------------------- |  | -------------
|Ordinary Shares of 11 17/43 pence each |  | 3,794,575,998

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in
Rule 405 of the Securities Act: Yes þ  No  ̈

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file
reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934.  Yes  ̈  No þ

Note  Checking the box above will not relieve any registrant required to file reports pursuant to Section 13
or 15(d) of the Securities Exchange Act of 1934 from their obligations under those Sections.

Indicate by
check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to
file such reports), and (2) has been subject to such filing requirements for the past 90 days:  Yes þ  No  ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate website, if any, every
Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files):  Yes  ̈  No  ̈

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of accelerated filer and large accelerated
filer in Rule 12b-2 of the Exchange Act.

|                          |  |                     |  |                        
|------------------------- |  | ------------------- |  | -----------------------
|Large accelerated filer þ |  | Accelerated filer  ̈ |  | Non-accelerated filer  ̈

Indicate by check mark which basis of accounting the registrant has used to prepare the
financial statements included in this filing:

U.S.
GAAP  ̈    International Financial Reporting Standards as issued by the International Accounting Standards Board þ     Other  ̈

If Other has been checked in response to the previous question, indicate by check mark which financial statement item the registrant has elected to follow.  Item 17  ̈    Item 18  ̈

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act).  Yes  ̈  No þ

This constitutes the annual report on Form 20-F of National Grid Plc (the Company) in accordance with the requirements of the US Securities and Exchange Commission (the SEC) for
the year ended 31 March 2013 and is dated 10 June 2013. Details of events occurring subsequent to the approval of the annual report on 15 May 2013 are summarised in section Further Information which forms a part of this
Form 20-F . The content of the Groups website (www.nationalgrid.com/uk) should not be considered to form part of this annual report on Form 20-F.









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##### Table of Contents

Form 20-F Cross Reference Table



|     |  |                                                       |  |                                                                                                                                                                                                                                                               |  |  |                      | 
|---- |  | ----------------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  | -------------------- | 
|Item |  | Form 20-F caption                                     |  | Location in the document                                                                                                                                                                                                                                      |  |  | Page                 | 
|1    |  | Identity
of directors, senior management and advisors |  | Not
applicable                                                                                                                                                                                                                                                |  |  |                     | 
|2    |  | Offer
statistics and expected timetable               |  | Not
applicable                                                                                                                                                                                                                                                |  |  |                     | 
|3    |  | Key Information                                       |  |                                                                                                                                                                                                                                                               |  |  |                      | 
|     |  | 3A Selected financial data                            |  | Summary consolidated financial information                                                                                                                                                                                                                  |  |  | 194-195              | 
|     |  |                                                       |  | Financial reviewFinancial performance                                                                                                                                                                                                                      |  |  | 46-51                | 
|     |  |                                                       |  | Additional informationOther disclosuresExchange rates                                                                                                                                                                                                     |  |  | 186                  | 
|     |  |                                                       |  | Exchange Rates                                                                                                                                                                                                                                              |  |  | FurtherInformation | 
|     |  | 3B Capitalization and indebtedness                    |  | Not applicable                                                                                                                                                                                                                                                |  |  |                     | 
|     |  | 3C Reasons for the offer and use of proceeds          |  | Not applicable                                                                                                                                                                                                                                                |  |  |                     | 
|     |  | 3D Risk Factors                                       |  | Additional informationBusiness information in detailRisk Factors                                                                                                                                                                                          |  |  | 176-178              | 
|4    |  | Information on the company                            |  |                                                                                                                                                                                                                                                               |  |  |                      | 
|     |  | 4A History and development of the company             |  | Delivering our strategyWhat did we achieve?                                                                                                                                                                                                                |  |  | 36-43                | 
|     |  |                                                       |  | Financial reviewFinancial position and resourcesSummarised balance sheet                                                                                                                                                                                  |  |  | 52-56                | 
|     |  |                                                       |  | Additional informationKey milestones                                                                                                                                                                                                                       |  |  | 187                  | 
|     |  |                                                       |  | Useful information                                                                                                                                                                                                                                          |  |  | 196                  | 
|     |  |                                                       |  | Additional informationOther disclosuresGeneral                                                                                                                                                                                                            |  |  | 184                  | 
|     |  | 4B Business overview                                  |  | Where we operate                                                                                                                                                                                                                                            |  |  | 17                   | 
|     |  |                                                       |  | What we do                                                                                                                                                                                                                                                  |  |  | 12-16                | 
|     |  |                                                       |  | Principal operations                                                                                                                                                                                                                                        |  |  | 18-25                | 
|     |  |                                                       |  | Operating environment                                                                                                                                                                                                                                       |  |  | 10-11                | 
|     |  |                                                       |  | Additional informationBusiness information in detailRegulation                                                                                                                                                                                            |  |  | 170-175              | 
|     |  |                                                       |  | Additional informationBusiness information in detailRisk factorsInfrastructure and IT systemsWe may suffer a major network failure
or interruption, or may not be able to carry out critical non network operations and Customers and counterparties |  |  | 176, 178             | 
|     |  | 4C Organizational structure                           |  | Note 33 to the consolidated financial statementsSubsidiary undertakings, joint ventures and associatesPrincipal subsidiary
undertakings                                                                                                                   |  |  | 155                  | 
|     |  | 4D Property, plants and equipment                     |  | Where we operate                                                                                                                                                                                                                                            |  |  | 17                   | 
|     |  |                                                       |  | Principal operations                                                                                                                                                                                                                                        |  |  | 20-24                | 
|     |  |                                                       |  | Our vision and strategyOur vision and strategic objectivesEmbed sustainability and Drive growth                                                                                                                                                        |  |  | 9                    | 
|     |  |                                                       |  | Operating environmentEnergy policy                                                                                                                                                                                                                         |  |  | 10-11                | 
|     |  |                                                       |  | Financial reviewFinancial position and resourcesSummarised balance sheetProperty, plant and equipment                                                                                                                                                    |  |  | 52                   | 
|     |  |                                                       |  | Additional informationOther disclosuresProperty, plant and equipment                                                                                                                                                                                      |  |  | 187                  | 
|     |  |                                                       |  | Note 10 to the consolidated financial statements Property, plant and equipment                                                                                                                                                                             |  |  | 123                  | 



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|     |  |                                                         |  |                                                                                                                                                                                                                              |  |  |                      | 
|---- |  | ------------------------------------------------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  | -------------------- | 
|Item |  | Form 20-F caption                                       |  | Location in the document                                                                                                                                                                                                     |  |  | Page                 | 
|     |  |                                                         |  | Note 19 to the consolidated financial statementsBorrowings                                                                                                                                                                |  |  | 134-135              | 
|4A   |  | Unresolved staff comments                               |  | Additional informationOther disclosuresUnresolved SEC staff comments                                                                                                                                                     |  |  | 189                  | 
|5    |  | Operating and financial review and
prospects            |  |                                                                                                                                                                                                                              |  |  |                      | 
|     |  | 5A Operating results                                    |  | Financial ReviewFinancial performance                                                                                                                                                                                     |  |  | 46-51                | 
|     |  |                                                         |  | Principal operations                                                                                                                                                                                                       |  |  | 18-25                | 
|     |  |                                                         |  | Financial ReviewFinancial position and resourcesNet debt                                                                                                                                                                 |  |  | 53-55                | 
|     |  |                                                         |  | Note 30 to the consolidated financial statementsFinancial risk(a) Market risk(i) Foreign exchange risk                                                                                                                  |  |  | 147-148              | 
|     |  |                                                         |  | Operating environment                                                                                                                                                                                                      |  |  | 10-11                | 
|     |  | 5B Liquidity and capital resources                      |  | Financial reviewFinancial performanceFinancial position and resources                                                                                                                                                    |  |  | 52-57                | 
|     |  |                                                         |  | Delivering our strategyWhat did we achieve?Driving growth and What are the risks?An inability to access capital markers
at commercially acceptable interest rates could affect how we maintain and grow our business |  |  | 42-4333              | 
|     |  |                                                         |  | Financial reviewFinancial position and resourcesCommitments and Contingencies                                                                                                                                         |  |  | 57                   | 
|     |  |                                                         |  | Additional informationDirectors report disclosuresMaterial interests in shares                                                                                                                                          |  |  | 183                  | 
|     |  |                                                         |  | Material Interests in Shares                                                                                                                                                                                               |  |  | FurtherInformation | 
|     |  |                                                         |  | Note 19 to the consolidated financial statementsBorrowings                                                                                                                                                                |  |  | 134-135              | 
|     |  | 5C Research and development, patents and licenses, etc. |  | Additional informationDirectors report disclosuresResearch and development                                                                                                                                              |  |  | 183                  | 
|     |  | 5D Trend information                                    |  | Financial ReviewFinancial performance                                                                                                                                                                                     |  |  | 46-57                | 
|     |  |                                                         |  | Principal operations                                                                                                                                                                                                       |  |  | 18-25                | 
|     |  |                                                         |  | Operating environment                                                                                                                                                                                                      |  |  | 10-11                | 
|     |  | 5E Off-balance sheet arrangements                       |  | Financial ReviewFinancial position and resourcesOff-balance sheet items                                                                                                                                                  |  |  | 57                   | 
|     |  | 5F Tabular disclosure of contractual obligations        |  | Note 27 to the consolidated financial statementsCommitments and contingencies                                                                                                                                             |  |  | 143                  | 
|     |  | 5G Safe Harbor                                          |  | Important notice                                                                                                                                                                                                           |  |  | 1                    | 
|     |  |                                                         |  | Cautionary Statement                                                                                                                                                                                                       |  |  | Back cover           | 
|6    |  | Directors, senior management and
employees              |  |                                                                                                                                                                                                                              |  |  |                      | 
|     |  | 6A Directors and senior management                      |  | Our Board Additional informationDirectors report disclosuresBoard biographies                                                                                                                                         |  |  | 26-27180-182         | 
|     |  | 6B Compensation                                         |  | Remuneration Report                                                                                                                                                                                                        |  |  | 68-90                | 



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|     |  |                                                   |  |                                                                                                                                                                                                                                                        |  |  |                           | 
|---- |  | ------------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |  |  | ------------------------- | 
|Item |  | Form 20-F caption                                 |  | Location in the document                                                                                                                                                                                                                               |  |  | Page                      | 
|     |  |                                                   |  | Note 2 to the consolidated financial statementsOperating costs(c) Key management compensation                                                                                                                                                      |  |  | 109                       | 
|     |  |                                                   |  | Note 22 to the consolidated financial statementsPensions and other post-retirement benefits                                                                                                                                                         |  |  | 136-138                   | 
|     |  |                                                   |  | Note 29 to the consolidated financial statementsActuarial information on pensions and other post-retirement benefits                                                                                                                                |  |  | 144-147                   | 
|     |  |                                                   |  | Share Ownership                                                                                                                                                                                                                                      |  |  | FurtherInformation      | 
|     |  | 6C Board practices                                |  | Corporate GovernanceThe Board                                                                                                                                                                                                                       |  |  | 59-60                     | 
|     |  |                                                   |  | Corporate GovernanceBoard and Committee Membership and attendance                                                                                                                                                                                   |  |  | 62                        | 
|     |  |                                                   |  | Corporate GovernanceAudit Committee                                                                                                                                                                                                                 |  |  | 63-65                     | 
|     |  |                                                   |  | Corporate GovernanceRemuneration ReportsRemuneration Committee                                                                                                                                                                                     |  |  | 68                        | 
|     |  |                                                   |  | Our Board Our governance structure Additional
informationDirectors report disclosures                                                                                                                                                          |  |  | 26-2728-29
180-182        | 
|     |  |                                                   |  | Remuneration ReportExecutive Directors service contracts, external appointments and retention of fees policy, termination and mitigation
and Non-executive Directors fees and letters of appointment                                           |  |  | 78-79                     | 
|     |  | 6D Employees                                      |  | Note 2 to the consolidated financial statements(b) Number of employees                                                                                                                                                                              |  |  | 109                       | 
|     |  |                                                   |  | Additional informationOther disclosuresEmployees                                                                                                                                                                                                   |  |  | 186                       | 
|     |  | 6E Share ownership                                |  | Remuneration ReportAll-employee share plans
Remuneration ReportImplementation Report 2012/13 Shareholding for Executive Directors                                                                                                               |  |  | 7482                      | 
|     |  |                                                   |  | Remuneration ReportImplementation Report 2012/13Remuneration
during the year ended 31 March 2013Directors interests in share options, Directors interests in the LTPP, PSP and DSP, and Directors beneficial interests
Share ownership |  |  | 86-90FurtherInformation | 
|7    |  | Major shareholders and related party
transactions |  |                                                                                                                                                                                                                                                        |  |  |                           | 
|     |  | 7A Major shareholders                             |  | Additional informationDirectors report disclosuresMaterial interests in shares                                                                                                                                                                    |  |  | 183                       | 



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|     |  |                                                            |  |                                                                                                                                                                              |  |  |                      | 
|---- |  | ---------------------------------------------------------- |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  | -------------------- | 
|Item |  | Form 20-F caption                                          |  | Location in the document                                                                                                                                                     |  |  | Page                 | 
|     |  | 7B Related party transactions                              |  | Note 28 to the consolidated financial statementsRelated party transactions                                                                                                |  |  | 144                  | 
|     |  | 7C Interests of experts and counsel                        |  | Not applicable                                                                                                                                                               |  |  |                     | 
|8    |  | Financial information                                      |  |                                                                                                                                                                              |  |  |                      | 
|     |  | 8A Consolidated statements and other financial information |  | Audit opinion for Form 20-F Basis of preparation                                                                                                                         |  |  | 9597-98              | 
|     |  |                                                            |  | Recent accounting developments                                                                                                                                             |  |  | 99                   | 
|     |  |                                                            |  | Consolidated primary statements                                                                                                                                            |  |  | 100-104              | 
|     |  |                                                            |  | Notes to the consolidated financial statements                                                                                                                             |  |  | 105-142              | 
|     |  |                                                            |  | Notes to the consolidated financial statementssupplementary information                                                                                                   |  |  | 143-164              | 
|     |  |                                                            |  | Chairmans Statement                                                                                                                                                       |  |  | 2-3                  | 
|     |  | 8B Significant changes                                     |  | Subsequent Events                                                                                                                                                          |  |  | FurtherInformation | 
|9    |  | The offer and listing                                      |  |                                                                                                                                                                              |  |  |                      | 
|     |  | 9A Offer and listing details                               |  | Additional informationOther disclosuresThe offer and listingPrice history                                                                                               |  |  | 189                  | 
|     |  |                                                            |  | Price History                                                                                                                                                              |  |  | FurtherInformation | 
|     |  |                                                            |  | Useful informationShare price                                                                                                                                             |  |  | 196                  | 
|     |  |                                                            |  | Exchange Rates                                                                                                                                                             |  |  | FurtherInformation | 
|     |  | 9B Plan of distribution                                    |  | Not applicable                                                                                                                                                               |  |  |                      | 
|     |  | 9C Markets                                                 |  | Useful informationShare price                                                                                                                                             |  |  | 196                  | 
|     |  | 9D Selling shareholders                                    |  | Not applicable                                                                                                                                                               |  |  |                     | 
|     |  | 9E Dilution                                                |  | Not applicable                                                                                                                                                               |  |  |                     | 
|     |  | 9F Expenses of the issue                                   |  | Not applicable                                                                                                                                                               |  |  |                     | 
|10   |  | Additional information                                     |  |                                                                                                                                                                              |  |  |                      | 
|     |  | 10A Share capital                                          |  | Not applicable                                                                                                                                                               |  |  |                     | 
|     |  | 10B Memorandum and articles of association                 |  | Additional information Other disclosuresArticles of association and Corporate governance practices: differences from New York
Stock Exchange (NYSE) listing standards |  |  | 184-185              | 
|     |  |                                                            |  | Additional informationDirectors Report disclosuresShare capital                                                                                                         |  |  | 183                  | 
|     |  | 10C Material contracts                                     |  | Additional informationOther disclosuresMaterial contracts                                                                                                                |  |  | 187                  | 
|     |  | 10D Exchange controls                                      |  | Additional informationOther disclosuresExchange controls                                                                                                                 |  |  | 186                  | 
|     |  | 10E Taxation                                               |  | Additional informationOther disclosuresTaxation                                                                                                                         |  |  | 187-189              | 
|     |  | 10F Dividends and paying agents                            |  | Not applicable                                                                                                                                                               |  |  |                     | 
|     |  | 10G Statement by experts                                   |  | Not applicable                                                                                                                                                               |  |  |                     | 
|     |  | 10H Documents on display                                   |  | Additional informationOther disclosuresDocuments on display                                                                                                              |  |  | 186                  | 
|     |  | 10I Subsidiary information                                 |  | Not applicable                                                                                                                                                               |  |  |                     | 
|11   |  | Quantitative and qualitative disclosures about
market risk |  |                                                                                                                                                                              |  |  |                      | 
|     |  | 11A Quantitative information about market risk             |  | Note 14 to the consolidated financial statementsDerivative financial instruments                                                                                          |  |  | 127-129              | 



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|     |  |                                                                              |  |                                                                                                                                                                 |  |  |         | 
|---- |  | ---------------------------------------------------------------------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  | ------- | 
|Item |  | Form 20-F caption                                                            |  | Location in the document                                                                                                                                        |  |  | Page    | 
|     |  |                                                                              |  | Note 30 to the consolidated financial statementsFinancial risk                                                                                               |  |  | 147-152 | 
|     |  |                                                                              |  | Note 31 to the consolidated financial statementsCommodity risk                                                                                               |  |  | 153-154 | 
|     |  |                                                                              |  | Financial reviewFinancial position and resources                                                                                                             |  |  | 52-57   | 
|     |  | 11B Qualitative information about market risk                                |  | Note 14 to the consolidated financial statementsDerivative financial instruments                                                                             |  |  | 127-129 | 
|     |  |                                                                              |  | Note 30 to the consolidated financial statementsFinancial risk                                                                                               |  |  | 147-152 | 
|     |  |                                                                              |  | Note 31 to the consolidated financial statementsCommodity risk                                                                                               |  |  | 153-154 | 
|     |  |                                                                              |  | Financial reviewFinancial position and resources                                                                                                             |  |  | 52-57   | 
|     |  |                                                                              |  | Delivering our strategyWhat are the risks?                                                                                                                   |  |  | 32-33   | 
|12   |  | Description of securities other than equity
securities                       |  |                                                                                                                                                                 |  |  |         | 
|     |  | 12A Debt securities                                                          |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 12B Warrants and rights                                                      |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 12C Other securities                                                         |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 12D American depositary shares                                               |  | Additional informationOther disclosuresDescription of securities other than equity securities; depositary fees and
charges                                  |  |  | 186     | 
|     |  |                                                                              |  | Additional informationOther disclosuresDepository payments to the Company                                                                                   |  |  | 185     | 
|     |  |                                                                              |  | Definitions and glossary of terms                                                                                                                             |  |  | 190     | 
|13   |  | Defaults, dividend arrearages and delinquencies                              |  | Not
applicable                                                                                                                                                  |  |  |        | 
|14   |  | Material
modifications to the rights of security holders and use of proceeds |  | Not
applicable                                                                                                                                                  |  |  |        | 
|15   |  | Controls
and procedures                                                      |  | Additional informationControlsInternal control over financial reporting, Disclosure controls and
Changes to internal control over financial reporting |  |  | 179     | 
|16   |  | 16A Audit committee financial expert                                         |  | Corporate GovernanceAudit CommitteeExperience                                                                                                               |  |  | 63      | 
|     |  | 16B Code of ethics                                                           |  | Additional informationDirectors report disclosuresCode of Ethics                                                                                           |  |  | 185     | 
|     |  | 16C Principal accountant fees and services                                   |  | Corporate GovernanceAudit CommitteeExternal Audit                                                                                                           |  |  | 64      | 
|     |  |                                                                              |  | Note 2 to the consolidated financial statements(e) Auditors remuneration                                                                                    |  |  | 110     | 
|     |  | 16D Exemptions from the listing standards for audit committees               |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 16E Purchases of equity securities by the issuer and affiliated purchasers   |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 16F Change in registrants certifying accountant                             |  | Not applicable                                                                                                                                                  |  |  |        | 
|     |  | 16G Corporate governance                                                     |  | Additional disclosuresOther DisclosuresCorporate governance practices: differences from New York Stock Exchange (NYSE) listing
standards                    |  |  | 185     | 
|     |  | 16H Mine safety disclosure                                                   |  | Not applicable                                                                                                                                                  |  |  |        | 
|17   |  | Financial statements                                                         |  | Not
applicable                                                                                                                                                  |  |  |        | 



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|     |  |                      |  |                                                                            |  |  |           | 
|---- |  | -------------------- |  | -------------------------------------------------------------------------- |  |  | --------- | 
|Item |  | Form 20-F caption    |  | Location in the document                                                   |  |  | Page      | 
|18   |  | Financial statements |  | Company accounting policies
Basis of Preparation                       |  |  | 165
97-98 | 
|     |  |                      |  | Recent accounting developments                                           |  |  | 99        | 
|     |  |                      |  | Consolidated primary statements                                          |  |  | 100-104   | 
|     |  |                      |  | Notes to the consolidated financial statements                           |  |  | 105-142   | 
|     |  |                      |  | Notes to the consolidated financial statementssupplementary information |  |  | 143-164   | 
|     |  |                      |  | Report of Independent Registered Public Accounting Firm                  |  |  | 95        | 
|19   |  | Exhibits             |  | Filed with the SEC                                                         |  |  |          | 



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|LOGO |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         | Headlines |                                                                                                                                                                                                                                                        | 
|     | £3,644m+4%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           | £3,754m+6%                                                                                                                                                                                                                                            
|     | Adjusted operating profit2011/12: £3,495m                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           | Operating profit 2011/12: £3,539m                                                                                                                                                                                                                     
|     | 56.1p+12%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 62.6p+13%                                                                                                                                                                                                                                             
|     | Adjusted earnings per share2011/12: 50.0p (i)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |           | Earnings per share 2011/12: 55.6p (i)                                                                                                                                                                                                                 
|     | £23.8bn+7%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           | $15.0bn+4%                                                                                                                                                                                                                                            
|     | UK regulatory asset value 2011/12: £22.2bn                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              |           | US rate base 2011/12: $14.5bn                                                                                                                                                                                                                         
|     | 40.85p+4%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               |           | 11.2%                                                                                                                                                                                                                                                 
|     | Ordinary dividends 2011/12: 39.28p                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      |           | Group return on equity 2011/12: 10.9%                                                                                                                                                                                                                 
|     |     Excludes the impact of exceptional items, remeasurements and stranded
cost recoveries. See page 50 for more information about these adjusted profit measures. 
(i)   Comparative earnings per share data has been restated for the impact of the scrip
dividend issues.  Our financial results are reported in sterling. The
average exchange rate, as detailed on page 50 was $1.57 to £1 in 2012/13 compared with the average rate of $1.60 to £1 in 2011/12. Except as otherwise noted, the figures in this Report are stated in sterling or US dollars. All
references to dollars or $ are to the US currency.
|     | Segmental reporting
 The performance of our principal businesses is reported by segment,
reflecting the management responsibilities and economic characteristics of each activity. 
Throughout this Report, the following colours are used to indicate references to a particular segment:
 LOGO
 UK Transmission  LOGO
 UK Gas Distribution  LOGO
 US Regulated  Activities which do not
fall within these segments are reported separately and are identified as:  LOGO
 Other activities  Discussion relating
to the Company as a whole is identified as:  LOGO
 Company activities                                  |           | Important dates
 5 June 2013
Ordinary shares go ex-dividend for 2012/13 
24 July 2013 Scrip election
date  29 July 2013
Annual General Meeting and interim management statement 
21 August 2013 2012/13 final
dividend paid to qualifying shareholders
|     | LOGO                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
|     |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |           | www.nationalgrid.com                                                                                                                                                                                                                                  



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Contents We have changed the way we present our Annual Report and Accounts so we can describe strategic information and our business model in a way
that we believe is easier to understand. This information is set out in our Strategic Review, with more detailed information, where relevant, included in Additional Information. We use a number of technical terms and abbreviations within this document. In the interest of saving paper, we do not define terms or provide
explanations every time they are used; please refer to the glossary on pages 190 to 193 for this information. Directors
Report The Directors Report, prepared in accordance with the requirements of the Companies Act 2006 and the UK Listing
Authoritys Listing, and Disclosure and Transparency rules, comprising pages 6 to 91 and 170 to 189, was approved by the Board and signed on its behalf by: Alison Kay Group General
Counsel & Company Secretary Company number 4031152 15 May 2013 Important
notice This document contains certain statements that are neither reported financial results nor other historical information. These
statements are forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. For a description of factors that could
affect future results, reference should be made to the full cautionary statement on the back cover of this document and to the risk factors section on pages 176 to 178.    Copyright National Grid plc 2013 ©, all rights reserved. The commission of any unauthorised act in relation to this document may result in
civil and/or criminal action.
 Strategic Review pages 01 to 5702

Chairmans statement04

Chief Executives review06

Financial review  in brief08

Our vision and strategy10

Operating environment12

What we do17

Where we operate18

Principal operations26

Our Board28

Our governance structure30

Internal control and risk management32

What are the risks?34

How executive remuneration aligns to Company strategy36

What did we achieve?44

Measuring performance  our KPIs46

Financial reviewCorporate Governance pages 58 to 91The Corporate Governance Report, introduced by the Chairman, contains details on the activities of the Board and its committees during the year,
including reports from the Nominations, Audit and Remuneration Committees, as well as details of our shareholder engagement activities.58

Corporate Governance contents59

Cross reference to Directors Report statutory and other disclosures68

Remuneration Report91

Shareholder engagementFinancial Statements pages 92 to
169Including the Independent Auditors
reports, consolidated financial statements prepared in accordance with IFRS and notes to the consolidated financial statements, as well as the Company financial statements prepared in accordance with UK GAAP.92

Introduction to the financial statements93

Statement of Directors responsibilities94

Audit opinions96

Contents of financial statementsAdditional Information pages 170 to 196Additional disclosures and information, definitions and glossary of terms, summary consolidated financial information and other useful
information for shareholders including contact details for more information or help.170

Contents of additional information190

Definitions and glossary of terms


LOGO






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Strategic Review Chairmans statement LOGO  The Board is
proposing a recommended final dividend of 
26.36p 2011/12: 25.35p Impressions and reflections on 2012/13 This has been a significant year for National Grid, which has seen substantial change in both the UK and US. One of the most important changes we have seen is Ofgems introduction of RIIO, a new eight year regulatory framework in the UK. In
February 2013, we agreed all the UK RIIO price control arrangements proposed by Ofgem. The Board believes the combination of revenue allowances and incentive mechanisms provides a good opportunity to earn appropriate returns for investors, while
delivering essential infrastructure investment for the benefit of consumers and the UK economy. The Board has seen improved
operational performance in the US, as well as the outcome of important rate filings, as Steve describes in his review on page 05. Also in the US, our response to Superstorm Sandy showed we have made improvements in our operational processes and
the way we interact with our stakeholders.
 Superstorm Sandy was a significant example of the changing weather patterns that we are
increasingly seeing in both the UK and US, with 2012 being one of the wettest years on record in the UK. This creates considerable operational challenges for our business and, when severe weather events occur, we need to be able to respond
effectively and efficiently. We announced our new dividend policy in March 2013. This has been a top priority for the Board over
the last year and is an important part of the way we create shareholder value. The new policy will aim to grow the ordinary dividend at least in line with the rate of RPI inflation each year for the foreseeable future. It will also support
our long-term ambition to target a sustainable dividend in real terms for our shareholders, while helping us maintain the strong balance sheet we need to fund the business. The Board has recommended an increase in the final dividend to 26.36p
per ordinary share, ($2.0088 per American Depositary Share), in line with our one year policy of targeting 4% growth in the year 2012/13, bringing the full year dividend to 40.85p per ordinary share. Being a responsible business We
contribute to our communities directly and indirectly in many ways. We maintain and operate the critical infrastructure needed to keep the lights on and the heating working across the UK and northeastern US, we employ more than 25,000 people and in
2012/13 contributed £1.2 billion in taxes in the UK alone.








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Our contribution goes further. For example, we estimate we support around 30,000 jobs in the first tier of our supply chain  in other
words, jobs in companies that are our suppliers across the globe. We are proud of our role serving the communities in which
we operate. We strive to be a responsible business, seeking to balance the need to build infrastructure efficiently with consideration for the environment. We are constantly looking for new ways to build and maintain our networks, applying innovative design and being both creative and flexible in
our approach to connecting people to the energy they need. The way in which we conduct business with our partners is equally
important. Our aim of forging strong relationships built on trust is reflected in our refreshed vision statement. It is also reflected in our line of sight  the framework that we use to link our objective setting right back to our
strategy and vision. In addition to focusing on what we must do to achieve our vision, we are now placing even greater emphasis on how we do it. I firmly believe that a company needs to act and behave responsibly in seeking to meet the varied needs of its many stakeholders, and our role as
an essential utility reinforces that requirement. To this end, we are implementing a comprehensive communications programme in 2013/14 to help remind all employees of the standards that are expected of us collectively and as individuals. Effective governance We are
implementing the phased transition of the Boards membership that I set out in last years Annual Report and Accounts. The challenges we have over the coming years in the UK and US require a fresh focus, so we have been investing time and
effort to develop the Board, refreshing its balance of skills, experience, knowledge and diversity. This brings a broad range of perspectives and challenge, which together with strong teamwork are important factors that I believe contribute to an
effective board. Over the year we have welcomed Nora Mead Brownell, Mark Williamson and, most recently, Jonathan Dawson to our Board
as Non-executive Directors. You can read more about the committees they have joined on page 62, as well as the appointment process on page 67. As a result of the Boards transition, Stephen Pettit and Linda Adamany stepped down from the Board in 2012 and Ken Harvey and George Rose will step down at this years AGM. Ken has been the Senior Independent Director since 2004 and chairman of the Remuneration Committee since 2011. Mark Williamson will succeed Ken as
Senior Independent Director and Jonathan Dawson will take over from him as chairman of the Remuneration Committee. George has been chairman of the Audit Committee for more than 10 years and Mark Williamson will take over this
role when George steps down. Chairmanship of these committees plays an important role in making sure the Board meets its responsibilities to shareholders and stakeholders. I would like to thank Ken and George for their commitment to the Board and the very valuable contribution they have made.
 LOGO In January 2013, Helen Mahy left the Company after 11 years. I would like to thank Helen for her valuable
contribution and commitment to the Company and the Board. We have appointed Alison Kay as our new Group General Counsel & Company Secretary. See page 182 for her biography. Looking ahead As we enter a new
phase for National Grid, I believe we are well positioned for the future. We have a refreshed Board that is operating effectively and will continue to set the tone at the top, helping us to meet the challenges we have on both sides
of the Atlantic. On many occasions during the year  in particular during Superstorm Sandy  our employees
dedication to customers has been outstanding. I am confident that our people will continue to help make National Grid a company we can all be proud of and I thank all our employees for their hard work and commitment to our success.  LOGO Sir Peter Gershon  LOGO


LOGO






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Strategic Review Chief Executives review  LOGO  Impressions and reflections on 2012/13 It has been another hugely important year for National Grid, both in the UK and US. We have been working hard to secure appropriate
regulatory arrangements while bedding down significant organisational changes on both sides of the Atlantic. These activities create
the foundation for our long-term success, in continuing to meet the needs of our customers, delivering our targeted returns and securing long-term financing for important investments. In the US, following our restructuring and cost reduction programme, we have continued to embed the process changes we have introduced. Superstorm Sandy tested the improvements we had made to our emergency response processes. Throughout 2012, we worked to improve
these processes, from training and customer communications through to the way we work on damage assessment, repairing assets and providing accurate estimated times of restoration.
 We also had to respond to a significant snowstorm in the US during the early part of 2013. As with
Sandy, our employees hard work and dedication made sure that we were able to restore power to our customers quickly and efficiently. How we performed during 2012/13 After a challenging 2011/12, we boosted our efforts to improve our safety
performance. Regrettably, in early April 2013 one of our contractors was fatally injured while working on a gas main upgrade near Albany, New York. We have been thoroughly investigating this tragic event in order to learn from it and prevent a
recurrence. Safety is not just about keeping our people safe. It is also about making sure members of the public are not put at risk
by our operations and we have seen significant progress in this area, with a 41% reduction in injuries to members of the public compared with last year.








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We are committed to raising the standards of visible safety leadership across the business and
supporting a culture of instinctive safety in our people. We have also been maintaining a relentless focus on process safety, supported by a new process safety management system. We have delivered good financial performance across our businesses with a 12% increase in adjusted earnings per share. For more information on our
financial results see page 06. I am delighted that we received commendations for our contribution to the success of the London 2012
Olympic and Paralympic Games, working closely with the London Organising Committee to safely ensure resilient energy supplies to the venues. However, there are areas that we need to improve. For example, in the UK we have a massive challenge to deliver the energy infrastructure the country needs, while minimising the impacts on communities and the environment. We know we
need to change the way we engage with our stakeholders and the public about our infrastructure plans. We are making efforts to focus on this through a campaign called Powering Britains Future. We have held a number of forums bringing together
leaders from across the energy industry with stakeholders from government, consumer and environmental groups. Our aim is to develop a clearer energy story and explain the difficult decisions that need to be taken when balancing the need for, and
cost of, this new infrastructure with protecting the landscape. We are encouraging a national conversation about the UK
energy challenge and a platform for people to share their ideas is provided at www.poweringbritainsfuture.co.uk. In the US,
we updated and consolidated our many legacy systems on to one single platform. With a system implementation of this scale and complexity we expected some difficulties following go live. We have, however, experienced operational difficulties that
significantly exceeded our expectations and we have devoted significant time and resources to resolving these. Learning from these
challenges and events is particularly important if we are to drive continuous improvement. Changes in regulation We are restructuring our UK business, which includes focusing the organisation on four main end-to-end processes that deliver our regulatory
outputs and value to our customers. The changes aim to make sure we are well positioned to deliver value under RIIO, the new
regulatory framework, and are prepared for our potential new role under Electricity Market Reform (EMR). This is intended to provide greater financial certainty to generation companies and aid growth of greener sources of power that
will need connecting to the grid. In the US, we will continue to submit rate filings so we can appropriately recover our cost of
operations and invest so we can provide for the safe, reliable and efficient delivery of energy to customers. Over the past year, we received unanimous approval from RIPUC for rates that took effect in February 2013. Our New York filing also
received unanimous approval, with new rates taking effect in April 2013. People I am committed to developing all our employees to the best of their abilities. I am also determined to create an inclusive, high performance
culture at National Grid. We need people with the right skills and experience to meet the current and future requirements of our business. This will include a mixture of
 experienced engineers and development programme trainees, from apprentices to graduates. That means we need people with STEM (science, technology, engineering and mathematics) skills, so I
believe it is important for us to continue the work we are doing with schools, to inspire the next generation of engineers and technicians. This will help us achieve our refreshed vision  connecting you to your energy today, trusted to help you meet your energy needs tomorrow. The results of our 2013 employee opinion survey, completed by 79% of our employees, included an engagement score of 63%. This is an important
measure. It highlights, for example, the extent to which employees would recommend National Grid to others as a place to work, as well as giving their time and energy to make it a success. For more information see page 39. In the previous years survey, employees told us we could increase the opportunities we provide for personal development. Consequently, among
the initiatives we have introduced is the development of an academy  a global, centralised hub of all our learning and development. This provides a clear learning path for all our employees that is aligned to the needs of the business. It
brings together and shares best practice from our own Company, as well as from our external partners. I am proud of all our
employees who have volunteered in their local communities, giving their time, skills and enthusiasm to support a wide range of projects. These ranged from environmental initiatives to projects helping young people improve their STEM skills, as
well as supporting our various partner charities, such as Special Olympics GB, Girls Inc. in the US and City Year in both countries. I would like to take this opportunity to say thank you to everyone who has been involved in these valuable
initiatives. Our priorities for next year  

Safety  our safety performance is moving in the right direction but it remains a top priority for us as we seek to achieve a world-class safety level; 

Execution  we will only succeed if we deliver on our commitments consistently, effectively and efficiently. Performance matters and we have to push ourselves as hard as we can to drive
the performance edge we will need this year; and 

Customer and communities  we have refined a lot of our processes so customers and communities are at the heart of our focus, but we still have a lot more to do.  LOGO Steve Holliday  LOGO


LOGO






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Strategic Review Financial review  in brief This year has seen good financial performance. Our financial measures have mostly improved compared with the prior year and we continue to see
opportunities for growth in the future.  52%+100 bps Total shareholder return
 £3,644m+4% Adjusted operating profit*
 56.1p+12% Adjusted
EPS*  £4,037m-10% Cash generated from operations
 13.6%+60 bps
UK return on equity 
9.2%+40 bps
US return on equity 
£33.7bn+8%
Regulated assets: UK RAV and sterling equivalent of US rate base
 *   Items presented as
adjusted exclude exceptional items, remeasurements and stranded cost recoveries. See pages 50 and 51 for further details
   Comparative
 amounts have been restated to reflect the impact of additional shares issued as scrip dividends Total shareholder return (TSR) We measure TSR as a key performance indicator (KPI) on a cumulative three year basis. The measure reflects changes in our share price and
also assumes dividends paid to shareholders over that period were reinvested in our shares. Cumulative TSR for the period 1 April 2010 to 31 March 2013 was 52% (1 April 2009 to 31 March 2012: 51%; 1 April 2008 to 31 March
2011: 4%). This reflects our strong dividend yield as well as the recovery in the financial markets since 2008/09.
 Earnings measures Adjusted operating profit Our
adjusted operating profit has increased 4% to a record high of £3,644 million, driven by higher net regulated income in our UK Transmission and UK Gas Distribution businesses of £277 million and £85 million
respectively, as a result of the impact of inflation and other price control allowances. Our US Regulated business further contributed as a result of higher Niagara Mohawk deferral recoveries and higher revenues from the increase in rate bases
of our FERC regulated entities. Major storms in the US (Superstorm Sandy and Storm Nemo) had an adverse impact on operating
profit of £136 million in 2012/13, £20 million higher than the costs of Tropical Storm Irene and the Massachusetts October snowstorm in 2011/12. Timing benefits of £16 million in 2012/13 were in line with the
£18 million net benefit in 2011/12. The £105 million decrease in adjusted operating profit for 2011/12 compared
with 2010/11 was due to adverse timing differences of £256 million and higher storm costs in the US of £116 million (due to Tropical Storm Irene and the October snowstorm in Massachusetts). These were partially offset by an
increase in UK regulated revenues of £220 million and improved results from other activities. Adjusted earnings
and EPS Our adjusted net interest charge remained broadly level with 2011/12 at £920 million, with a reduction in the cost
of our index-linked debt offsetting the impact of higher debt levels and loss on disposal of financial instruments. The £217 million decrease in adjusted net finance costs in 2011/12 to £917 million was mainly due to:
lower interest rates on short term instruments; lower debt repurchase costs; the benefit of lower average net debt as a result of those debt buy backs; and a favourable variance in pension interest due to a higher than expected rate of return
on US pension assets. Our adjusted tax charge was £69 million lower than 2011/12, mainly due to changes in tax provisions
in respect of prior years and a 2% decrease in the UK statutory corporation tax rate in the year, partially offset by increased taxes on higher taxable profits. As a result of this, our effective tax rate for 2012/13 was 25.0% (2011/12: 29.2%;
2010/11: 29.2%). The 2011/12 effective tax rate before exceptional items, remeasurements and stranded cost recoveries did not change from 2010/11 because a fall in prior period tax credits was primarily offset by a 2% reduction in the UK corporation
tax rate and a change in the UK/US profit mix. The above earnings performance has translated into adjusted EPS growth in 2012/13 of
6.1p (12%) (adjusted EPS growth in 2011/12 of 0.4p (1%)). The impact of the movements above on adjusted EPS for 2011/12 and 2012/13 has been shown in the chart opposite:








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LOGO Cash generated from operations Cash generated from operations was £4,037 million (2011/12: £4,487 million; 2010/11: £4,854 million). Adjusted
operating profit before depreciation, amortisation and impairment increased by £228 million year on year, however this was offset by a year-on-year reduction in working capital of £556 million and the cessation of stranded cost
recoveries in 2012/13 (£247 million received in 2011/12). The adverse working capital is driven by the US, due to the timing of cost recoveries from LIPA relating to Superstorm Sandy, as well as increased receivables due to a colder winter and
higher commodity prices in 2013 compared with 2012. The reduction in cash generated from operations from 2010/11 to 2011/12 reflected
lower operating profits, unfavourable movements in the UK due to higher Gas Distribution receivables, higher pension deficit payments and lower stranded cost recoveries than in 2010/11. These were offset by working capital movements due to the
weather in the US (including lower receivables due to the milder winter, lower gas costs and improved collections). Asset return
measures UK return on equity The UK ROE has increased 60 bps to 13.6%, mainly driven by outperformance in the gas transmission and distribution businesses against allowed returns, as well as the benefit of a lower tax charge in the period. Our electricity
transmission returns have remained broadly constant year on year. The UK ROE for 2012/13 has now returned to the same level as 2010/11, following UK RAV growth driven by RPI and investment in 2011/12.  LOGO
 US return on equity The US ROE has increased 40 bps to 9.2%, mainly driven by customer growth in our Massachusetts Gas business and recognition of the full allowed
return in our Niagara Mohawk electricity business following the reversal of a prior period provision. The increase of 50 bps from 2010 to 2011 mainly related to the impact of our restructuring savings and the full-year impact of our new
Massachusetts Gas rate plan which was effective from November 2010. LOGO Regulated assets Our regulated assets have increased by £2.5 billion, reflecting the continued high levels of investment in our network in both
the UK and US. The UK RAV increased by £1.6 billion reflecting inflation and significant capital expenditure in our UK Transmission business in particular. The US rate base increased by £0.9 billion, £0.5 billion due to
foreign exchange movements and £0.4 billion due to investment in our networks and working capital movements. LOGO      LOGO


LOGO






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Strategic Review Our vision and strategy Our vision sets out our intentions and aspirations at the highest level, while our strategic objectives outline what we need to do to achieve that
vision.  LOGO








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What our vision and strategic objectives mean to us Our vision sets out our intentions and aspirations at the highest level. Our strategic objectives set out what we believe we need to achieve
to deliver our vision and be recognised as a leader in the development and operation of safe, reliable and sustainable energy infrastructure. Deliver operational excellence  achieve excellent levels of safety, reliability, security and customer service. Our customers, communities and other stakeholders demand safe, reliable and secure supply of their energy. This is reflected in our regulatory contracts where we are measured and rewarded on the basis of meeting our commitments to
customers and other stakeholders. Excellence in operational processes should allow us to manage our assets efficiently, deliver
network improvements quickly and provide services that meet the changing demands of customers. Engagement with our customers and communities will make sure our outputs reflect their needs and priorities. It will help maximise the benefits our
stakeholders derive from the value we deliver. Engage our people  create an inclusive, high performance culture by
developing all our employees. It is through the hard work of our employees that we will achieve our vision, respond to the needs
of our stakeholders and create a competitive advantage. Creating an engaged and talented team that is aligned with our strategic objectives is vital to our success. Our presence within the communities we serve, the people we work with and our
opportunities to grow both individually and as a business are all important to making National Grid a good place to work. Stimulate
innovation  promote new ideas to work more efficiently and effectively. Our commitment to promoting innovation underpins how
we will run our networks more efficiently and effectively and deliver on our regulatory incentives. Across our business, we will explore new ways of thinking and working to benefit every aspect of how we deliver on our customer and stakeholder
commitments. Embedding innovation and new technology into our operations makes sure we deliver continuous improvements in the quality
and cost of our services. Engage externally  work with external stakeholders to shape UK, EU and US energy policy. Policy decisions by regulators, governments and others directly affect our business. We engage widely in the energy policy
debate, making sure our position and perspective shape future policy direction. We also engage with our regulators to manage uncertainty and provide the right mechanisms so we can deliver infrastructure that meets the demands of a changing energy
landscape. Embed sustainability  integrate sustainability into our decision making to create value, preserve natural
resources and respect the interests of our communities. Our long-term sustainability strategy sets our ambition to deliver these aims
and to embed a culture of sustainability within our organisation. That culture will make sure we make decisions that protect and preserve natural resources and benefit the communities in which we operate. We remain committed to our targets of a
45% reduction in Scope 1 and 2 greenhouse gas emissions by 2020 and 80% by 2050.
 Drive growth  grow our core businesses and develop future new business options. We continue our aim of gaining the best possible value from our existing portfolio while exploring and evaluating opportunities
for growth. Making sure our portfolio of businesses maintains the appropriate mix of growth and cash generation is necessary to meet the expectations of our shareholders. We review investment opportunities carefully and will only invest where we can reasonably expect to earn an adequate return. Combining this
disciplined approach with operational and procurement efficiencies gives us the best possible opportunity to drive strong returns and meet our commitments to investors. How our strategy creates value Our vision and strategic objectives explain what is important to us, so we can meet our commitments and deliver value. Shareholder value Regulatory
frameworks  operating under robust regulatory frameworks can help to reduce cash flow volatility. Shaping these frameworks to maintain a balance of risk and return underpins our investment proposition. Reputation, safety and capability  our approach to safety and our reliability record underpin our reputation and brand. These are
important factors that enable positive participation in regulatory discussions and the pursuit of new business opportunities. Efficient operations  efficient capital and operational expenditure allows us to deliver regulatory outputs at a lower cash cost and
reduces working capital requirements. Maximising revenues  positive performance under incentive mechanisms, and
delivery of the outputs our customers and regulatory stakeholders require, helps us to maximise allowed revenue. Funding and cash
flow management  positive net cash flows and an innovative funding strategy help to deliver long-term growth. Outperforming the allowed cost of debt can provide improved profitability. Disciplined investment  we can achieve future revenue and earnings growth by increasing our regulatory asset value and rate base in
line with regulatory capital allowances. Investment in non-regulated assets helps us to use and enhance our core capabilities with the aim of delivering attractive returns. Customer and community value Safety and reliability  providing reliable networks in a safe way is at the core of customer expectations. Affordability  providing services in a cost efficient way helps to reduce the impact on customer bills. Customer service  providing reliable services that meet the needs of our customers and communities is a crucial part of
the value they receive from us. Environmental sustainability  we aim to protect the environment and preserve
resources for current and future generations. Emergency services  we provide telephone call centres, coordinate the
response to make safe unplanned gas escapes and respond to severe weather events. Community engagement  we listen to the
communities we serve and work to address concerns about the development of our networks. Our people volunteer for community based projects and we support educational initiatives in schools.


LOGO






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Strategic Review Operating environment Our operations are influenced and affected by what is going on in the world around us. We shape our decision making to try and balance the impact
of these external factors, so we can deliver value for our customers, shareholders and other stakeholders.  Macroeconomic factors Our rate plans and price controls are agreed against the backdrop of the broader macroeconomic environment. In the UK, low economic growth is projected in 2013 and, as a result, it is unlikely that we will see a significant decline in the
unemployment rate during 2013. Unemployment in the US has seen a slow but steady decline throughout 2012. However, with only modest
growth forecast for 2013 this is likely to remain high for a while. In the US, we retain some risk of bad debts when customers are unable to pay their bills, so these conditions can have a more direct impact on our financial performance. In the US, consumer confidence has remained weak, with more people believing that business conditions will worsen
in the short term than those believing they will improve. This view puts considerable downward pressure on bills. We must accommodate our customers affordability concerns while fulfilling our obligations to provide
safe and reliable services and making necessary system investments. The environment for infrastructure investment in the UK and
Europe is evolving, with new investors continuing to be attracted to regulated assets. Sovereign wealth and infrastructure funds are becoming more prominent investors in UK assets. In the US, we saw a number of major utility mergers during 2012 as our peers and competitors sought to gain efficiencies from greater scale and
position themselves for growth opportunities. We have also seen independent transmission developers pursuing large scale projects connecting wind power across the country, as well as prominent utilities investing capital in non-regulated solar
assets. Changing energy mix Our networks exist to transmit and distribute energy from its source to its place of use. Changes to the energy mix and location of centres of supply and demand will create pressures on our networks. We may need to continue to
invest in our networks to meet these challenges. In the UK, some older coal fired power stations are closing to comply with the Large
Combustion Plant Directive and recent fuel prices have reduced the economic viability of gas fired power stations to the point where some are now being mothballed or closed. Looking further ahead, a continued decline in fossil fuel fired electricity
generation is to be expected if the governments carbon reduction targets are to be met.
 New low carbon generation will not necessarily be located in the same place as existing plant
and will probably require new connections. Where gas comes into the UK is also changing with forecast reductions in North Sea production and increased reliance on imported gas. We will need to adapt our network to ensure sufficient
capacity is in place to move gas from these different source locations to the demand centres. In the US, increased gas supplies,
resulting from developments in shale gas, have led to lower gas prices and created increased demand. This is fuelling growth of gas distribution as customers convert to gas. Additionally, our electricity distribution customers benefit from lower electricity prices as gas fired generation often sets the market price for
electricity in the northeastern US. As more generation plants convert to low priced natural gas, opportunities for investment in additional gas network capacity may arise. Energy policy Policy decisions
by governments, government authorities and others can have a direct impact on our business. They can affect the amount and location of investment required in our networks and the way we operate. They can also change our compliance obligations.
Understanding the evolving policy environment is important to understanding the challenges and opportunities we have ahead. In
the UK, energy policy continues to evolve from the Climate Change Act 2008 which commits the UK government to reducing UK greenhouse gas emissions to a level at least 80% lower than a 1990 baseline by 2050. In November 2012, the Energy Bill, which implements the main aspects of Electricity Market Reform (EMR), was introduced to parliament. EMR
seeks to set out the future industry context and promote investment in low carbon generation by providing greater financial certainty to investors. The Energy Bill is expected to receive Royal Assent this year. At a European level, the three cornerstones of sustainability, security of supply and affordability underpin energy policy. Greater levels of
market integration, interconnection and renewable generation are fundamental to achieving these policy objectives. While European developments present challenges, the significant level of investment required may create opportunities for growth.








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In the US, many of the developments at a federal level have been through federal agency regulations
and Presidential executive orders. We have supported some additional requirements, such as those of the Environmental Protection Agency (EPA) to implement new air and water quality regulations. We are also working with EPA to ensure our
Long Island power generation fleet complies with any new regulations and to remediate contaminated sites where we hold legacy liability. At a state level, energy policy continues to evolve in the northeastern US. This is driven by interest in promoting energy efficiency, maintaining reliability and deploying renewable technologies that help meet environmental and
energy diversity goals. All of the states in which we operate have standards that meet or exceed EPAs regulations. In
particular, the nine northeastern states that participate in the Regional Greenhouse Gas Initiative agreed to reduce power plant emissions and increase funding for energy efficiency and clean energy. Regulatory developments In the
UK, the regulatory focus during the year has been the finalisation of the new RIIO price controls. RIIO gives greater focus to incentives and innovation than the previous regulatory regime. The projected increase in offshore wind generation and interconnection has created a debate on the regulatory approach to electricity
transmission investment  a debate we are fully engaged in. Competition is already in place for offshore development in the UK and Ofgem has stated its intent to retain the option of using greater competition for certain large onshore
projects. In the US, we have completed new rate filings for our gas and electricity businesses in New York and Rhode Island. In
Massachusetts, we are actively involved with the Massachusetts Commission and neighbouring utilities in the grid modernisation notice of inquiry. This addresses grid reliability during extreme weather conditions, system efficiency and
interconnection of distributed generation. We are also actively involved in the New York Energy Highway initiative to examine new
ways of delivering infrastructure in the state. All these initiatives will present new opportunities to respond to customers needs and build the necessary infrastructure to address these needs. In addition to the investment required for new connections and to meet the challenges of changing supply and demand patterns, we need to
replace ageing infrastructure in both the UK and US. Cast iron gas mains still in use can be more than 100 years old and over time can create a safety risk and also contribute to greenhouse gas emissions through leaks. The recent severe weather in the US has also highlighted the potential need for additional investment in network resilience. Regulators and
policymakers are beginning to ask utilities to put plans in place to strengthen their networks ability to withstand the effects of severe weather.
 Innovation and technology New technology can change the way we do business. The pace of technological development in the energy sector is accelerating as new technologies
take shape and approach commercial viability. HVDC technology could play an important part in the development of a more integrated electricity grid, particularly the extension of offshore links. While carbon-based generation is likely to
remain a significant part of the global energy mix, carbon capture and storage technologies may become critical to governments achieving their climate change targets. Technologies such as energy storage, electric transportation
and distributed generation, all have the potential to affect our networks significantly. The development of smart grids will
change how loads are balanced across the distribution network. It will allow our customers to make smarter energy choices and will increase network flexibility. New consumer products, such as alternative fuelled vehicles and distributed generation,
will increase demand and require new infrastructure. Innovation goes further than new technology. We need to increase the
flexibility of our infrastructure to respond to developments as they arise. This can mean managing energy and networks differently, rather than creating new infrastructure to meet supply and demand changes.


LOGO






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Strategic Review What we do Electricity The electricity
industry connects generation sources to homes and businesses via transmission and distribution networks. Electricity is sold to consumers by companies who have bought it from the generators and pay to use the networks across which it is transmitted.  LOGO








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LOGO


LOGO






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Strategic Review What we do Gas The gas industry connects
producers, processors, storage, transmission and distribution network operators, as well as suppliers to industrial, commercial and domestic users.  LOGO








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LOGO


LOGO






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Strategic Review What we do How we make money from our regulated assets  LOGO








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Where we operate  LOGO


LOGO






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Strategic Review Principal operations UK Transmission  What we do We own the electricity transmission system in England and Wales. Our networks comprise approximately 7,200 kilometres (4,470 miles) of overhead
line, 1,400 kilometres (870 miles) of underground cable and 329 substations. We are also the national electricity transmission system operator, responsible for both the England and Wales transmission system, and the two high voltage
transmission networks in Scotland, which we do not own. Day-to-day operation of the system involves the continuous real-time
matching of demand and generation output. We are also designated as system operator for the new offshore electricity transmission regime. We own and operate the gas national transmission system in Great Britain, with day-to-day responsibility for balancing demand. Our network comprises approximately 7,660 kilometres (4,760 miles) of high pressure pipe and 23
compressor stations. Principal risks  

The energy landscape in the UK and Europe is changing. These changes could have an impact on our business so it is important that we are involved in the discussions surrounding their development. 

In order to deliver strong financial and operational performance under RIIO, we will need to successfully complete multiple complex business improvement and transformation activities that will
affect our people, processes and systems. 

Delivery of construction projects, to which we are committed, may be affected if we are unable to obtain planning consents in a timely manner. 

Our operations could be disrupted by industrial action by employees. Where we are heading 2012/13 has been a significant year, marking the start of a major transformation programme that
will enable us to respond to our changing external and internal operating environment. Having established an operating model that
allows us to see and understand more clearly the performance of our regulated businesses, we are now focused on driving performance to make sure we meet the needs of our customers and stakeholders and deliver value under the new price
controls. In particular we will need to be sharper in our commercial relationships, driving the performance of our contractors. We have been asked by DECC to act as delivery body for its potential electricity market reforms (see page 10). We will carry out
analysis to help inform Government decisions on energy policy, as well as administering key parts of the enduring regime.  LOGO
 LOGO How we are progressing  

Delivered strong safety, operational, customer and financial performance in 2012/13. 

Secured new eight year price controls for electricity transmission and gas transmission. 

Emphasised end-to-end electricity and gas transmission processes in our organisational design. 

Refined our organisational design and appointed managers into their roles. We are reducing the number of manager roles by 22% and, at the same time, we have clearly articulated peoples
accountabilities. 

Fundamentally changed our partnering approach for delivering major transmission capital projects. This involves revised contracts with our electricity alliance partners that make accountability
clearer. We have also introduced additional layers of competition for delivery of some aspects of our work. Priorities
for the year ahead  

Continue to improve safety performance and maintain focus on specific areas including induced voltage. 

Build on the foundations we have established during 2012/13 and deliver under the first year of our new price control. 

Embed the organisational design through all layers of our business. 

Define and embed new ways of working. 

Continue to enhance our capabilities in process and performance excellence, as well as commercial and contract management. 

Increase innovation to help us meet the output measures we are committed to delivering under RIIO. 

Continue to work closely with DECC and Ofgem to help inform and manage security of supply through a period of significant change in the UK energy market.








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UK Transmission The
results of the UK Transmission segment for the years ended 31 March 2013, 2012 and 2011 were as follows:  Years ended 31 March2013
£m


2012
£m


2011  £mRevenue


4,246



3,804



3,484Operating costs excluding exceptional items


(2,637
)


(2,450
)


(2,121)Adjusted operating profit


1,609



1,354



1,363Exceptional items


(43
)






(70)Operating profit


1,566



1,354



1,293 Principal movements (2010/11  2012/13)  LOGO


LOGO






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Strategic Review Principal operations UK Gas Distribution  What we do We own and operate four of the eight regional gas distribution networks in Great Britain. Our networks comprise approximately 131,000 kilometres
(82,000 miles) of gas distribution pipeline and we transport gas from the gas national transmission system to around 10.9 million consumers on behalf of 26 gas shippers. Gas consumption in our UK networks was 306 TWh in 2012/13
compared with 259 TWh in 2011/12. We manage the national gas emergency number (0800 111 999). This service, along with the enquiries
lines, appliance repair helpline and meter enquiry service, handled 2,480,669 calls during 2012/13. Principal risks  

The potentially dangerous nature of our activities, for our employees, contractors and the public, drives us to stay focused on process and personal safety. 

Our ability to deliver our operational performance and standards of service relies on the underlying availability, accuracy and integrity of our businesses systems and data. 

In order to deliver strong financial and operational performance under RIIO, we will need to realise the benefits of our end-to-end business processes and new contractual arrangements with our
alliance partners. 

Our operations could be disrupted by industrial action by employees. Where we are heading Two years into our transformation programme in Gas Distribution, we have established the
foundations for success under RIIO. We will now build on this so we can meet the needs of our customers and stakeholders and deliver value under the new price control. Our customers and stakeholders have told us what they expect of us through the RIIO talking networks consultation, so we will continue
to make sure we can provide a safe and reliable service at the right cost. To make sure our transformation is sustainable we will
continue to develop a culture of process and performance excellence so that all our people, including supervisors and field force, are empowered to innovate and improve our business. We will also increase our commercial and contract management capability to make sure we can drive the performance of our contractors who deliver a
significant proportion of our work.  LOGO
 LOGO How we are progressing  

Delivered strong safety, operational, customer and financial performance in 2012/13. 

Secured a new eight year price control for Gas Distribution. 

Completed the roll out of new systems and processes through our Gas Distribution front office (GDFO) project  a significant milestone in our transformation programme. All four of our
gas distribution networks are now using GDFO systems to help deliver our major processes: emergency response, repair, mains replacement and connections. 

Maintained our focus on process and performance excellence by continuing to build skills and capabilities and further strengthening a culture of continuous improvement. 

Agreed new terms and conditions with our 1,900 directly employed field force employees. The new arrangements support improved productivity and increased flexibility, so we can perform under
RIIO. 

Agreed new contracts to deliver £3.5 billion of investment (primarily mains replacement and connections). These Gas Distribution strategic partnerships align our contract partners
incentives with the way we are incentivised under RIIO. Priorities for the year ahead  

Continue to improve safety performance and maintain focus on specific areas, including reducing cable strikes and safer operation of road vehicles. 

Maintain a strong focus on the service we provide to our customers, including improving our response to complaints and enquiries and showing our customer facing employees how customers rate the
service they provide. 

Continue to build our capabilities in process and performance excellence, as well as commercial and contract management. 

Work closely with our Gas Distribution strategic partners so we change to the new contracts quickly and smoothly. An effective transition will help make sure we maintain a high standard of work,
strong safety and customer performance and continue to meet work delivery targets. 

Increase innovation to help us meet the output measures we are committed to delivering under RIIO.








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UK Gas Distribution The
results of the UK Gas Distribution segment for the years ended 31 March 2013, 2012 and 2011 were as follows:  Years ended 31 March2013
£m


2012
£m


2011  £mRevenue


1,714



1,605



1,524Operating costs excluding exceptional items


(920
)


(842
)


(813)Adjusted operating profit


794



763



711Exceptional items


(31
)


(24
)


(40)Operating profit


763



739



671 Principal movements (2010/11  2012/13)  LOGO


LOGO






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Strategic Review Principal operations US Regulated  What we do We own and operate electricity distribution networks in upstate New York, Massachusetts, and Rhode Island. Through these networks we serve
approximately 3.4 million electricity consumers in New England and upstate New York. We also own and operate 50 electricity
generation units on Long Island that together provide 3.8 GW of power under contract to LIPA. Our plants consist of oil and gas fired steam turbine, gas turbine and diesel driven generating units ranging from 2 MW to 385 MW. Our US gas distribution networks provide services to around 3.5 million consumers across the northeastern US, located in service territories
in upstate New York, New York City, Long Island, Massachusetts and Rhode Island. We added 29,925 new gas heating customers in these areas in 2012/13. We are responsible for billing, customer service and supply services. We forecast, plan for and procure approximately 13.9 billion standard cubic metres of gas and 30 TWh of electricity annually across three states. We own and operate an electricity transmission system of approximately 14,000 kilometres (8,700 miles) spanning upstate New York, Massachusetts,
Rhode Island, New Hampshire and Vermont operating nearly 160 kilometres (100 miles) of underground cable and 522 substations. We also maintain and operate the electricity transmission and distribution system on Long Island owned by LIPA, covering 3,185 square kilometres
(1,230 square miles). Our contract with LIPA expires on 31 December 2013, and we will continue to service and provide support during the transition process. Principal risks  

The potentially dangerous nature of our activities, for our employees, contractors and the public, drives us to stay focused on process and personal safety. 

Our approach to preventing and responding to catastrophic gas or electricity network interruptions is affected by the increasing frequency and severity of storms and evolving stakeholder
expectations. 

The transformation of our information systems may fail to deliver anticipated benefits, which could affect our US business plan or cause delays to financial reporting that breach our debt
covenants. 

Our ability to recover incurred expenditure in a timely manner may be affected by the changes in regulation or decisions by regulators on regulatory filings.  LOGO
 LOGO Where we are heading Having reorganised our US businesses in 2011 under a model that acknowledges our regulatory jurisdictions, we have introduced a programme that
aims to make sure operational excellence is a hallmark of our processes and culture by 2015. We call this journey towards operational
excellence Elevate 2015 and it focuses on eight end-to-end business processes. During 2012/13, we focused on our meter to cash and emergency response processes. Others are now taking shape, including workplace safety, network operations, rate case
management, customer service and asset maintenance. As we enhance each business process, our decision-making criteria are governed by
four main principles: safety and reliability, stewardship, customer responsiveness and cost competitiveness. How we are
progressing  

Overall reliability improved for our electricity and gas businesses despite the severe weather events experienced. 

Significant improvements to our emergency preparedness processes to better address safety, customer satisfaction and restoration response time. During Superstorm Sandy (see page 37) and Storm Nemo
our restoration efforts were lauded by community leaders, regulatory officials and customers for our emergency preparedness, community outreach and communication, as well as relatively swift restoration times. 

New rate cases filed for our upstate New York and Rhode Island gas and electricity businesses, each of which was approved by its respective regulatory body. Officials praised the quality of the
Companys rate case plan and supporting data as well as our community outreach and communications. 

We implemented our new enterprise resource planning system in November and December which, in time, is expected to enable further operational efficiencies and support process
improvements. Priorities for the year ahead  

Drive our focus and behaviours to prevent injuries and safeguard the public. 

Improve the customer experience through end-to-end process excellence and delivery of our work plan on time and on budget. 

Embed the new system into our end-to-end processes and begin to extract value from this investment in line with our plan. 

Embed a regulatory focus and rate case readiness into our business practices and systems. Commence preparations for expected rate case filings in calendar year 2014 for the electricity
business in Massachusetts and the gas businesses in downstate New York and Long Island. 

Increase the level of our engagement with and volunteering in our communities.








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US Regulated The
results of the US Regulated segment for the years ended 31 March 2013, 2012 and 2011 were as follows:  Years ended 31 March2013
£m


2012
£m


2011  £mRevenue excluding stranded cost recoveries


7,918



7,516



8,391Operating costs excluding exceptional items, remeasurements and stranded cost recoveries


(6,665
)


(6,326
)


(6,984)Adjusted operating profit


1,253



1,190



1,407Exceptional items and remeasurements


170



(296
)


(51)Stranded cost recoveries


14



260



348Operating profit


1,437



1,154



1,704 Principal movements (2010/11  2012/13)  LOGO


LOGO






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Strategic Review Principal operations Other activities  Grain LNG Grain LNG is one of three LNG importation facilities in the UK. It was constructed in three phases becoming operational in 2005, 2008 and
2010 respectively. It operates under long-term contracts with customers and provides importation services, storage and send out capacity on to the national transmission system. We are exploring with customers a number of developments to the Grain
site to enhance its revenue earning capability. BritNed BritNed is a joint venture between National Grid and TenneT, the Dutch transmission system operator, which built, and now owns and operates a
1,000 MW subsea electricity link between the UK and the Netherlands, which is approximately 260 kilometres (162 miles) in length. BritNed, which entered commercial operations on 1 April 2011, is a merchant interconnector that sells
its capacity via a range of explicit and implicit auction products. Metering National Grid Metering (NGM) provides installation and maintenance services to energy suppliers in the regulated market in Great Britain. It
maintains an asset base of around 15 million domestic, industrial and commercial meters. Through Ofgems Review of Metering Arrangements, National Grid has been appointed National Metering Manager to facilitate the transition to smart
metering in the domestic sector. NGM has also been leading a pricing consultation to define the tariff caps to apply in future to
traditional domestic gas metering. This process is due to conclude in summer 2013. In addition, NGM has been further developing its services in the industrial and commercial market. NGM achieved its highest customer satisfaction scores for the last six years for both domestic, and industrial and commercial businesses. UK Property National
Grid Property is responsible in the UK for the management, clean up and disposal of surplus sites, most of which are former gasworks. This year has seen us embedding our outsourcing agreement with Capita Symonds that was signed in May 2012 and our
new tender arrangements for the clean up of contaminated land. Both of these have started to deliver operational and financial efficiencies in managing and cleaning up our surplus estate.  LOGO
 LOGO Xoserve Xoserve delivers transactional services on behalf of all the major gas network transportation companies in Great Britain, including National Grid. Xoserve is jointly owned by National Grid, as majority shareholder, and the
other gas distribution network companies. US non-regulated businesses Some of our US businesses are not subject to state or federal rate-making authority, including interests in certain of our LNG road
transportation, certain gas transmission pipelines (the Millennium and Iroquois gas transmission pipeline projects are regulated by FERC, however our minority equity interests in them are not), and certain commercial services relating
to solar installations, fuel cells and other new technologies. Corporate activities Corporate activities comprise central overheads, insurance and expenditure incurred on business development.








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Other activities The results of our other activities segment for the years ended 31 March 2013, 2012 and 2011 were as follows:  Years ended 31 March2013










2012










2011£m










£m










£mRevenue


642











715











678Operating costs excluding exceptional items


(654
)










(527
)










(559)Adjusted operating (loss)/profit


(12
)










188











119Exceptional items














104











(42)Operating (loss)/profit


(12
)










292











77 Principal movements (2010/11  2012/13)  LOGO


LOGO






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Strategic Review Our Board    The successful delivery of our strategy is dependent upon attracting and retaining the right
talent. This starts with our Board; a broad range of expertise and backgrounds ensures a good balance of skills, expertise and knowledge. However, creating a high performing Board where directors work well together is not just about skills and
experience; it is also about behaviours and dynamics. As already highlighted, the Board has been in a state of transition recently.
This has allowed us to think hard about creating an inclusive and diverse culture that fosters positive behaviour and encourages dynamics to come to the fore of all boardroom interactions. We have used the opportunity of the Board refresh to
widen the range of knowledge and background of the members. The appropriate skills base is complemented by a diversity of thinking styles. Hence, lively debate and constructive challenge is encouraged at all times; the boardroom is a
place where questions are valued, no debate is discouraged and all Non-executive Directors have an equal voice regardless of their background, expertise and tenure.
 This enables the Board to be a sounding board for ideas. Management are encouraged to
bring their proposals before the Board during the development phase to allow the Non-executive Directors the opportunity to input, challenge and review prior to a project seeking full financial sanction. In this way, the Board works
collectively to challenge the Company to deliver superior performance and enhances the Companys ability to understand and anticipate opportunities and challenges. On these pages we set out the age, committee membership and tenure of our Board members. For their full biographical details, see pages 180
to 182.
    LOGO








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LOGO  Our
Chairmanis responsible for the leadership and management of the Board and its governance. By promoting a culture of openness and debate, he facilitates the effective contribution of all Directors and helps maintain
constructive relations between Executive and Non-executive Directors.  Our Chief Executiveis responsible for the executive leadership and day-to-day management of the Company, to ensure the delivery of the strategy agreed by the Board. Through
his leadership of the Executive Committee, he demonstrates commitment to safety, operational and financial performance.



Our Senior Independent
Directoracts as a sounding board for the Chairman and serves as an intermediary for the other Directors, as well as shareholders as required.
 Independent of management, our Non-executive
Directorsbring diverse skills and experience, vital to constructive challenge and debate. Exclusively, they form the Audit, Nominations, Remuneration and SEH Committees, and have a key role in developing
proposals on strategy.


LOGO






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Strategic Review

Our governance structure







|                    |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  |                                                                                                                                                                                                                                                                                        |  |  |  |                                                                                                                                                                                                                                                                                                          |  | 
|------------------- |  | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | 
|Our Board           |  | Our Board is collectively
responsible for the effective oversight of the Company and its businesses. It also determines the strategic direction and governance structure that will help achieve the long-term success of the Company and deliver sustainable shareholder
value. The Board sets the risk appetite for the Company and takes the lead in areas such as safeguarding the reputation of the Company and financial policy, as well as making sure we maintain a sound system of internal control (see page 30). The
Boards full responsibilities are set out in the matters reserved for the Board, available on our website. 
In line with these responsibilities and the key challenges and opportunities facing the Company, the Chairman sets the Boards agenda,
making sure adequate time is available to discuss all agenda                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |  | 
|                    |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  |                                                                                                                                                                                                                                                                                        |  |  |  |                                                                                                                                                                                                                                                                                                          |  | 
|Committee oversight |  | The Board delegates authority
to its committees to carry out certain tasks on its behalf, so that it can These operate committees efficiently are summarised and give the below right level and their of attention full terms and of consideration reference are to available
relevant on matters. our website. The committees communicate and work together where required  for example, on some risk matters the Safety, Environment and Health Committee collaborates with the Audit Committee.
 Committee agendas and schedules of items to be discussed at future meetings
are prepared in line with the terms of reference of each committee.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |  | 
|                    |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  | 
|                    |  | Audit Committee                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  | Finance Committee                                                                                                                                                                                                                                                                      |  |  |  | Nominations
Committee                                                                                                                                                                                                                                                                                    |  | 
|                    |  | Oversees the Companys financial reporting, and internal controls and their effectiveness, together with the procedures for identifying,
assessing and reporting risks. It also oversees the services provided by the external auditors and their remuneration.                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  | Sets policy and grants authority for financing decisions, credit exposure, policy for hedging and foreign exchange transactions, guarantees and
indemnities. It also approves other treasury, tax, pensions and insurance strategies or, if appropriate, recommends them to the Board. |  |  |  | Responsible for considering the structure, size and composition of the Board and committees, and succession planning. It also identifies and
proposes individuals to be Directors and executive management reporting directly to the Chief Executive, and establishes the criteria for any new position. |  | 
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|                    |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  |                                                                                                                                                                                                                                                                                        |  |  |  |                                                                                                                                                                                                                                                                                                          |  | 
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|Management          |  | Executive Committee                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |  | 
|                    |  | Led by the Chief Executive, the Executive Committee oversees the safety, operational and financial performance of the Company. It is responsible for making day-to-day management and operational decisions it considers necessary to
safeguard the interests of the Company and to further the strategy, business objectives and targets established by the Board. The committee plays a key role in the development of our people and driving a high performance culture. In line with
common practice, the Executive Committee has ceased to be a committee of the Board; its levels of authority, role and responsibilities remain unchanged. 
It approves expenditure and other financial commitments within its authority levels and discusses, formulates and approves proposals to be
considered by the Board.  There are currently ten members of the
committee. They have a broad range of skills and expertise, which are updated through training and development. Some members also hold external non-executive directorships, giving them valuable board experience. The committee also considers
succession planning and the talent pipeline to the committee.  The
committee officially met 11 times this year, but the members interact much more regularly. Those members of the committee who are not Directors all regularly attend Board and committee meetings with Alison Kay, Group General Counsel & Company
Secretary, secretary to the Board and Nominations Committee. This means that knowledge is shared and every member is kept up to date with business activities and developments. |  | 
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items, including strategic
issues. In order to operate effectively, the Board receives accurate, timely and clear information, including updates on legal, regulatory, corporate governance and best practice matters and presentations by internal and external advisors. To
strengthen the Directors knowledge and understanding of the Company, Board meetings regularly include updates and briefings on specific aspects of the Companys activities. Additionally, the Non-executive Directors are expected to visit
at least one operational site to meet local management teams and discuss aspects of the business with employees. 
Attendance at Board and committee meetings during the year is set out on page 62.



LOGOTo support discussion and
decision-making, committee members receive papers in advance of meetings so they can prepare for and consider agenda items. Where appropriate, subject matter experts give presentations and provide the opportunity for directors to ask questions.
Following discussion, as appropriate, matters are endorsed, approved or recommended to the Board by the committee. The chairman of each committee provides the Board with a summary of the main decisions and discussion points so the other
directors are updated.  For more information about the Board and
its committees and examples of the matters that they have considered during the year, see Corporate Governance from page 58.Remuneration
Committee



Safety,
Environment and Health
CommitteeDetermines remuneration policy and practices to attract, motivate and retain high-calibre executive directors and other senior employees to
deliver value for shareholders and high levels of customer service, safety and reliability.



In relation to safety, environment and health, the committee reviews the strategies, policies, initiatives, risk exposure, targets and
performance of the Company and, where appropriate, of its suppliers and contractors. It also monitors the resources we use for compliance and driving improvement in these areas.LOGOManagement
CommitteesTo help make sure we allocate time and expertise in the right way, the Company has a number of management committees, which include the Disclosure Committee (see page 65 for more details), Business Conduct Committees and the Global
Retirement Plan Committee. These management committees provide reports, where relevant, to the appointing committee in line with our governance framework on the responsibilities they have been delegated.


LOGO






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Strategic Review Internal control and risk management   The
Board is committed to protecting our reputation and assets, as well as safeguarding the interests of our shareholders. We achieve this through maintaining a sound system of internal control.  LOGO








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Our system of internal control and, in particular, our risk management process, has been designed
to support our strategic and business objectives as well as internal control over financial reporting. We aim to do this through:  

mitigating risk; 

making sure our information, including financial reporting, is accurate and reliable; 

complying with our obligations  both internal and external; 

applying sound governance practices; and 

making informed and timely decisions to further our objectives. As
we have shown in the diagram opposite, the Board establishes the control environment. Supported by dedicated, specialist teams, it sets risk appetite, approves policies and monitors performance. Where appropriate it delegates authority to its
committees. Combined with the assessments completed by process owners, this top down and bottom up approach is used to maintain
quality within the internal control process. Our internal controls are designed to manage rather than eliminate material risks. We
balance the costs of internal controls with the magnitude and likelihood of the risks being managed in light of our risk appetite.  LOGO Accurate and reliable information plays a vital role in our decision making, while education, training and
awareness are all important elements that help us maintain effective internal controls. Our internal control process
starts with identifying risks, compliance matters and other issues. We do this through routine reviews carried out by process owners and facilitated by relevant dedicated, specialist teams. We record risks in our risk register, assess the
implications and consequences for the Group and determine the likelihood of occurrence.
 We put in place action plans, controls and other process improvements designed to address the risks
and issues we have identified. We assess the effectiveness of our controls regularly and seek independent assurance where it is appropriate to do so. We formally report the outcomes of our risk identification and control assessments to senior management and the relevant oversight bodies. This informs our decision-making and provides assurances about our internal controls to
management and the Board. We regularly monitor our action plans, other process improvements and the status of risks. The results
of our review help update the process as the cycle continues. Internal control over financial reporting We have specific internal mechanisms to govern the financial reporting process and the preparation of the Annual Report and Accounts. Our
financial controls guidance sets out the fundamentals of internal control over financial reporting which are applied across the Group and the group accounting guides provide guidance on our accounting policies. Within our processes we have system, transaction and oversight controls. In addition, our businesses prepare detailed monthly management reports
which include analysis of their results along with comparisons to relevant budgets, forecasts and prior year results. These are presented to and challenged by senior management within Finance. The Finance Director, in turn, presents a consolidated
management report to the Board. These reviews are supplemented by quarterly performance reviews, attended by the Chief Executive and
Finance Director. They discuss historical results and expected future performance and involve senior management from both operational and financial areas of the business. Reviewing the effectiveness of our internal control Each year the Board reviews the effectiveness of our internal control process, including financial reporting, to make sure it remains robust. The latest review covered the financial year to 31 March 2013 and the period to
the approval of this Annual Report and Accounts. It included:  

the receipt of a letter of assurance from the Chief Executive which consolidates the main matters of interest raised through the year-end assurance process; 

where appropriate, assurance from our committees, with particular reference to the reports received from the Audit and SEH Committees on reviews undertaken at their meetings; and 

assurances about the certifications required under Sarbanes-Oxley as a result of our US reporting obligations.  Our internal control processes comply with the Turnbull guidance on internal control and the requirements of the UK Corporate Governance Code. They are also the basis of our compliance with obligations set by the Sarbanes-Oxley Act
2002 and other internal assurance activities.    LOGO


LOGO






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Strategic Review What are the risks?   Below
is an overview of some of the main risks we face that could have a material adverse effect on our business, financial condition, results of operations and reputation, as well as the value and liquidity of our securities. For a more comprehensive
description, please see pages 176 to 178. We have included some examples of the actions implemented to address these risks. It is not always possible to eliminate a risk even where a response is in place and considered effective.  Some of our main risksRisk description

Examples of mitigating actionsAspects of the work we do could potentially harm employees, contractors, members of the public
and the environment

  We have established safety and occupational health plans, programmes and procedures that are aimed at
continuous improvements in safety performance.  Group wide initiatives are supplemented with specific regional safety programmes. These
are aimed at addressing specific areas so that safety is at the forefront of every employees mind. We also benchmark against other industry groups to seek and implement best practice.  We continue to focus on process safety, aimed at preventing major incidents. This
includes the process and procedures governing the development and design of our assets, as well as the competence of the people who will build, operate and maintain them.  We monitor employee lost time injury frequency rate as a key performance indicator
(KPI) as described on page 45. We also have other measures relating to personal and process safety, and use them to understand our safety strengths and identify any weaknesses we need to address.Events outside our control, such as malicious attacks (including cyber security breaches) or severe storms, could cause a major network failure or compromise the security of our physical assets, processes, systems and
data

  We use industry best practices as part of our cyber security policies, processes and
technologies. We continually invest in cyber strategies that are commensurate with the changing nature of the security landscape.  Following the major US storms of 2011, we overhauled our emergency response processes
and have since used the improved processes, tools and approach during our response to Superstorm Sandy and other severe weather events. We are using the lessons we have learnt to further refine the end-to-end process.Our core business and growth strategies may be affected negatively by changes to our legal and regulatory framework and future energy policies

  We participate in regulatory and energy policy development and implementation to help
shape the outcomes.  In the UK, we are working with DECC on its proposals relating to Electricity Market
Reform. We have also restructured our business so we are prepared for our potential new role under Electricity Market Reform and to make sure we are well positioned to deliver value under RIIO.  Our UK price controls have reopeners for some categories of expenditure
where costs and volumes are currently uncertain; we can use these reopeners in certain circumstances to request additional allowances and output targets to be set when the cost and volumes become clear.  In the US, we are maintaining our jurisdictional focus and we will continue to file new
rate cases so our businesses can earn a fair and reasonable rate of return. Our rate filings include structural changes where appropriate, such as revenue decoupling mechanisms, capital trackers, commodity related bad debt true ups and pension
and other post-employment benefit true ups, as described on pages 173 to 175.Current and future business performance may not meet our expectations or those of our stakeholders

  We have restructured our UK business as described above, establishing end-to-end
process teams aimed at improving customer service and efficiency and building a culture of continuous improvement.  We have a three-year US strategy (Elevate 2015) focused on safety and reliability,
customer responsiveness, stewardship and cost competitiveness, with performance measures that are tracked and reported monthly. US jurisdictional presidents continue to develop strong relationships with local regulators and
communities.  Our US business has implemented a new enterprise resource planning system. The
successful delivery of this programme is seen as a key enabler for delivering our strategic objectives in the US.  We monitor network reliability, regulated controllable operating costs and customer
satisfaction as KPIs, as described on pages 44 and 45.








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Some of our main risksRisk description

Examples of mitigating actionsBusiness development decisions may not deliver targeted outcomes or meet all stakeholder
expectations

  We regularly monitor and analyse market conditions, competitors and their potential strategies, as well
as the performance of our Group portfolio. We are also looking to access new sources of finance and capabilities through partnering.  We have internal processes for the review and approval of investments in new
businesses, disposals of existing ones and organic growth investment opportunities. These are reviewed and revised from time to time to ensure our approach supports our short- and long-term strategies. We undertake due diligence exercises on
acquisition or partnering opportunities and carry out post-investment reviews to make sure lessons are learnt for the future.Fluctuations in external market conditions, including foreign exchange, interest rates and commodity prices, could affect our financial position

  Our treasury function manages financial risks, including foreign currency and interest
rate risks, to within pre-authorised parameters and under policies and guidelines approved by the Finance Committee.  For our US-based regulated businesses, within predefined risk parameters, we use
forward purchase contracts for electricity, gas and electricity capacity, as well as derivative instruments linked to those commodities.An inability to access capital markets at commercially acceptable interest rates could affect how we maintain and grow our business

  We identify short-term liquidity and long-term funding requirements by regularly
producing short- and long-term cash flow forecasts, along with undertaking financial headroom analysis. The assessment of our liquidity takes into account the regulatory requirements that may restrict our ability to pay dividends from some of our
operating businesses.  We maintain a number of commercial paper and medium-term note programmes to facilitate
short- and long-term debt issuance.  We manage refinancing risk by limiting the amount of debt maturities on borrowings in
each financial year.Customers and counterparties may fail to meet their obligations such as paying bills or delivering contracted services

  Security deposits or other forms of collateral may be obtained from commercial and
industrial customers to reduce the risk from customer default.  In the US, we have processes and programmes aimed at minimising bad debts from
retail customers.  We maintain a diverse range of commodity suppliers to reduce the credit or non
performance risk from the failure of any one supplier.  The Finance Committee has agreed a policy for managing financial counterparty risk.
This sets exposure limits based on an individual counterpartys credit rating from independent rating agencies. We also consider other leading indicators of counterparty financial distress and reduce exposure below the approved limits, if
appropriate.  Where multiple financial transactions are entered into with a single financial
counterparty, a netting arrangement is usually put in place to reduce our exposure to the credit risk.We may fail to attract, develop and retain employees and leadership with the competencies, values and behaviours required to deliver our strategy and vision

  We introduced a new global leadership development framework in 2012.  We are developing a global, centralised academy to allow us to gather and share best
practice from within National Grid and from our external partners. This should help us build the skills and capabilities our business will need in the future, as well as contributing to employee development.  We have described on pages 38 and 39 some of the ways we seek to engage employees,
including how we promote inclusion & diversity.  We monitor employee engagement as a KPI, as described on page 45, and formally solicit
employee opinions via a Group wide employee survey annually.


LOGO






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Strategic Review How executive remuneration aligns to Company strategy  The Remuneration Committee aligns the remuneration policy to our Company strategy and main business objectives. Performance-based incentives
are earned through achieving demanding targets for short-term business and individual performance, as well as creating long-term shareholder value.  LOGO








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The Remuneration Committee determines remuneration policy and practices through which we aim
to attract, motivate and retain high-calibre Executive Directors and other senior employees to deliver value for shareholders and high levels of customer service, safety and reliability. Alignment to strategy While
aligning the remuneration policy to our strategic objectives, the Remuneration Committee aims to ensure the policy:  

reflects shareholders and customers interests; 

takes into account risk-related factors; and 

contributes to driving the highest possible ethical standards. Each
year we review our incentive plans, ie the APP and LTPP, to confirm the performance measures remain closely aligned with the Companys strategic objectives. APP  SteveHollidayandAndrewBonfield

NickWinser

Tom KingFinancial measures for 2012/13 (i)

AdjustedEPS

Adjusted EPS

Adjusted EPSConsolidatedcash flow

Consolidated cash flow

Consolidated cash flowUK ROE

UK adjusted operating profit

US operating profit (US GAAP basis)US ROE

UK ROE

US cash flowN/A

N/A

US ROE (i) Financial measures represent 70% of the APP. Individual performance objectives in the APP reflect 30% of the plan and are defined in terms of target and stretch performance requirements. The
performance objectives change each year, depending upon business priorities. Examples of individual objectives include regulatory management, business development activities and customer satisfaction improvement programmes. The Remuneration Committee may use its discretion to reduce APP awards to take account of significant safety or service standard incidents. In
addition, the Remuneration Committee considers environmental, social and governance issues in its assessment of performance.
 LTPP  Performance measure

Definitions andperformance
period

WeightingAdjusted EPS

Threshold performance

50% of the plan where EPS growth exceeds RPI growth by 3%Upper target performance where EPS growth exceeds RPI growth by 8%Performance period 3 yearsRelative TSR compared with the FTSE 100

Threshold performance

25% of the plan where TSR is at the median of the FTSE 100Upper target performance where TSR performance is 7.5% above that of the median company in the FTSE 100Performance period 3 yearsUK and US ROEs  based on UK Transmission and UK Gas Distribution ROEs and on US
Regulated returns

Threshold performance

25% of the plan where allowed regulatory returns are achieved (UK) and -1% (US)Upper target performance where allowed regulatory returns are out-performed by 2% (UK) and 1% (US)Performance period 4 years If the Remuneration Committee considers the underlying financial performance of the Company does not justify the
vesting of LTPP awards, even if some or all the performance measures are satisfied in whole or in part, it can declare that some or all the awards lapse. Overall, the Remuneration Committee believes the measures offer a balance between meeting the needs of all our stakeholders and incentivising Executive Directors to achieve sustainable performance. LOGO


LOGO






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Strategic Review What did we achieve?   It has
been another important year for National Grid as we secured appropriate regulatory changes and continued to bed down organisational change in both the UK and US. Here, we highlight some of the work we did, and initiatives we introduced, during
2012/13 to support delivery of our strategy.   Delivering operational excellence Safety remains a top priority for us and we strive to improve our performance. We also recognise the vital importance of good customer service and
community relationships. Our licences and regulatory agreements set our reliability targets and these are linked to our revenue streams. Safety Our ambition is to
achieve a world-class safety level by 2015, featuring a lost time injury frequency rate of below 0.1. We intend to achieve this through a relentless leadership focus, robust safety management systems and tactical actions focused on our main risks,
which may vary between regions and business areas. Our employee lost time injury frequency rate for 2012/13 was 0.17, compared with
0.18 in 2011/12. While this represents a marginal improvement we recognise that we need to do more to achieve our ambition. We have included below some examples of our main safety initiatives, which aim to reduce incidents. In the UK, we introduced our Take Care campaign, which focused on cable avoidance in our UK Gas Distribution business. We also updated our
overhead line rules for work at height and guidance about the use of equipment at height. We connect office-based employees to the
safety aspects of our operational activities through targeted campaigns, raising the profile of safety in the workplace and behaviours at home. Examples of our initiatives during 2012/13 include interactive experiences, screen savers and
seasonal safety messages. In the US, we launched an initiative aimed at reducing and eliminating risks associated with securing loads.
This involved upgrading vehicles and improving load securing devices, as well as training and exercises. At a local level, we
developed safety plans that gave supervisors and crew leaders greater authority to take action to address their most pressing safety needs. We also arranged a number of sessions in which survivors of utility industry accidents shared how their
lives had changed in an instant and talked to employees about how they can make a personal commitment to safety. In 2012/13, we
published our Company wide process safety management system and updated our process safety commitment statement. We have modified our global incident reporting system so we can better differentiate process related incidents to improve communication,
enhance visibility and share information relating to process safety events. We have been continually increasing awareness and
developing our safety culture through training initiatives, including elearning.
 Delivering customer service We measure the success of our customer service initiatives through the Ofgem customer satisfaction studies and independent customer research in
the UK. In the US, several independent customer research studies and other measures are used to supplement the four J.D. Power and Associates customer satisfaction studies. The results of the studies can be found on page 45. In the UK, our customer satisfaction results have demonstrated improvement in some areas in Transmission and Gas Distribution. In the
US, although the overall JD Power residential customer satisfaction quartile results remained unchanged and commercial studies saw a decline, we achieved significant improvements in key internal transaction studies including website satisfaction and
electricity order fulfilment. Work continues to enhance service to our customers as part of our Elevate 2015 programme, large end-to-end process review and improvement activities, customer callback programme, and our more actionable
approach to measuring customer satisfaction. LOGO








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One area in which we have been improving how we communicate with customers is our response to
storms. Through Twitter and Facebook we are now providing real-time weather updates, safety tips, outage reporting, restoration times and community resources before, during and after a storm. We are also using YouTube and Flickr to illustrate,
through videos and photos, how we prepare for storms and restore service. More than 104,000 US customers are enrolled in our broadcast text alert programme, which we activate during major storms to provide outage updates and safety tips. During
2012/13, we launched a further texting programme that provides area specific outage numbers and estimated restoration times. From
their mobile devices, US customers can now report and check the status of their outages, as well as view important safety tips, contact information and outage data including maps, online via m.nationalgrid.com. During the February 2013 snowstorm,
more than 11,000 customers reported outages through this website, which received around 205,000 visits. As part of our preparations to
respond to Superstorm Sandy, the most devastating storm to hit the US eastern seaboard in more than 100 years, more than 250 employees supported the community liaison effort, assigned to the towns expected to be hardest hit by the storms. Reliability We aim
to deliver reliability by: planning our capital investments to meet challenging demand and supply patterns; designing and building robust networks; risk-based maintenance and replacement programmes; and detailed and tested incident response
plans. In the UK, we are pleased to report that our Gas Distribution business successfully met all its regulatory standards of service
again this year with all networks running on Gas Distribution front office systems for emergency, repair, mains replacement and connections activities. In the US, we met all but three of our regulatory reliability and service replacement targets. In New York, two gas metrics were slightly below target due to the severe impact of Superstorm Sandy and we have
petitioned for an exemption on these measures in light of the special circumstances. In Massachusetts, we missed one of our electricity circuit level metrics and avoided a financial penalty due to earned offsets for good performance on the
system metrics. For further details on our reliability performance, see page 45. UK business changes We are
restructuring our UK business so that we are well positioned to deliver value under RIIO and are ready for our potential new role under Electricity Market Reform. We have completed our UK organisational design for senior leaders. We are consulting UK Transmission employees on a number of changes which,
if agreed, will reduce costs and increase efficiency. We have redefined our organisational design, reducing the number of manager roles by 22%. During the year, new terms and conditions of employment have been agreed for around 1,900 Gas Distribution directly employed field staff. The changes focus on rewarding individual rather than collective performance.
 From 1 April 2013, UK Gas Distribution entered into contracts with Balfour Beatty Utility
Solutions and a joint venture of Morrison Utility Services and Skanska Construction UK Limited called tRIIO, to replace our previous alliance and coalition arrangements. Mainly covering our mains replacement programme, the contractual framework is
aligned to the new regulatory incentives regime.  LOGO US storm response updates Superstorm Sandy was a significant test for our emergency response processes, which we overhauled following the major storms of 2011. Throughout
2012, we focused on employee development and training and upgrading our restoration processes and equipment. We improved the way we work on damage assessment, customer communications, securing restoration resources, repairing assets and
providing accurate estimated times of restoration. Before Sandy made landfall, we had thousands of employees ready in support roles, a
full complement of line and tree crews, as well as hundreds of supplemental crews from across 40 states and five provinces in Canada. Upstate New York, Massachusetts and Rhode Island had about 530,000 electricity outages and around 700 flood related gas outages (mainly in Rhode
Island). We completed restoration in these service territories in six days. In downstate New York, it took more than two weeks to
restore the LIPA served Nassau and Suffolk Counties, which saw around 1.1 million wind and flood related electricity outages. These same counties, along with Brooklyn, Queens and Staten Island, experienced more than 140,000 flood related
gas outages. The Governor of New York has established a commission (commonly referred to as the Moreland Commission) to review the
response of New York utility companies to storms in recent years. That Commission has indicated that it will conclude its work in late spring or early summer. In December 2012, MADPU issued an order detailing penalties associated with the response
by a number of utilities to Tropical Storm Irene and the October snowstorm in 2011. This included a penalty of around $19 million relating to our Massachusetts Electric business. We are appealing this decision, as are the other utilities involved.


LOGO






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Strategic Review

What did we achieve?

Continued



US foundation programme We have continued work on our US foundation programme throughout the year. The programme relates to the development and implementation of our new
US enterprise resource planning system, which went live during November and December 2012. The successful delivery of this programme is seen as a key enabler for delivering our strategic objectives in the US, by creating an integrated platform that
allows process and system standardisation across our activities. The new system replaced two legacy and a number of ancillary systems and will support business processes for finance, human resources, supply chain and certain elements of our
operational systems such as fleet and inventory management. As with many system implementations of this magnitude and complexity, we
expected some degree of difficulty in the months following go live. We have, however, experienced operational difficulties that significantly exceeded our expectations. The most substantial of these related to our payroll processing, where
we experienced a number of errors in employee pay and delays in providing employees with their statutory tax statements. We implemented an extensive stabilisation programme to identify and resolve or mitigate these payroll issues and by
year end they were substantively resolved. These and other system conversion difficulties and their consequential impacts have delayed production of local financial reporting. As a result, we have sought extensions of time relating to the filing of
certain financial reports and other related regulatory filings from our US regulators, from some finance providers and other parties requiring financial statements from some of our operating companies. Recognising the importance of these issues we have focused considerable efforts on their resolution, together with external support. We have
undertaken a review of the project implementation to identify lessons learnt, particularly focused on the payroll issues, and this has been presented to the Audit Committee. We will continue to assess these lessons and identify changes to processes
for other similar programmes in the future. Engaging our people Engaging our people helps to retain the best possible range of talent and experience, which will be necessary to meet the needs of our business. We
are committed to developing our employees to the best of their abilities and to creating an inclusive and diverse culture. We measure
employee engagement through our employee opinion survey. Below we describe the results of this years survey and highlight some of the actions that have been taken in response to previous ones. Development The results of our
2012 survey showed that one of the three main factors driving engagement in our Company was having opportunities for personal development. To develop the leadership capability of our next generation of managers and middle level leaders, we introduced a new global leadership development framework in 2012.
 LOGO Our UK business has developed an education and readiness programme to raise everyones awareness and
understanding of RIIO, and how we will need to change the way we work both as an organisation and as individual employees. In the
UK, our graduate retention levels are consistently high, standing at 85% in January 2013. We also achieved a number of awards (see panel  External recognition). We provide training and other support so that our people can build, maintain and operate our networks safely and reliably. During 2012/13, we provided around 150,000 days of training for our employees and 20,000 days of training for non employees globally. We also
increased the amount of specialist technical training delivered in-house, to reduce costs. Appreciate The results of past employee surveys showed us that employees see recognition as an important part of engagement. So, we have launched
appreciate, a global recognition programme that encourages our people to recognise and reward their colleagues for a job well done. Features include career milestones and the Chairmans Awards, as well as an online system employees
can use to send and receive feedback on great work they see. The system also administers non-financial awards.  External recognition  Some of the awards
and other means of external recognition we have received over the last year include: 
   Inclusion in the Times Top 50 Employers for Women 2013. We have appeared in the
list since 2006.    A ranking of 84 in the Times Top 100 Graduate
Employers  up 11 places from 2011.    Moving from 14 to 3 in The
Job Crowd Top 50 Companies for Graduates to work for and first place for working within the energy and science sector.
   Recognised by Diversity Inc. magazine as one of the top seven regional utilities
for diversity in the US, as well as by Diversity Careers in Engineering/Technology as a best diversity company.








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Promoting inclusion & diversity We aim to develop and operate our business with an inclusive and diverse culture, with equal opportunity in recruitment, career development,
training and reward. This applies to all employees regardless of race, gender, nationality, age, disability, sexual orientation, gender identity, religion and background. Where existing employees become disabled, our policy is to provide continued
employment and training wherever practical. These policies support the attraction and retention of the best people, improve
effectiveness, deliver superior performance and enhance our success. We promote inclusion & diversity both within and outside
our Company. In the US, we recognise the markets in which we conduct business are becoming increasingly diverse. We reflect this through our supplier diversity programme, through which we invite small businesses, as well as ones owned by women,
veterans or people from minority groups, to participate in our sourcing opportunities. This means we can provide a fair, competitive environment that includes all firms in the communities we serve. Our female employees are able to access the
Springboard and Spring Forward development programmes in the UK and Women Empowered in the US. On the basis of headcount, the percentage of women in management positions is 25.5%, a figure we intend to improve, and 22.7% of employees throughout
the Company are women. In the US, we attended 41 recruiting events focused on people with disabilities, ethnic diversity, women and
veterans. Our employee survey The results of our 2013 survey, which was completed by 79% of our employees, have helped us identify specific areas where we are performing well and those areas we need to improve. Our engagement index has fallen by three points to 63%. It is fair to assume the problems we experienced with payroll in the US and the extensive
changes we have introduced in the UK have contributed to the fall in our engagement score. Managers receive a simple scorecard that
aims to create greater leadership accountability and we produce survey reports and action plans at Company, regional, business unit, function and team levels. Managers also have access to an engagement framework. This provides them with practical
tools and guidance to support them when developing action plans for their teams. Attracting the best people During 2012/13, we received more than 90,000 applications for jobs and have welcomed nearly 2,000 new employees globally. We have introduced a web-based recruitment system to improve our hiring process in the UK and are planning a similar initiative in the US. In the UK, we have continued our programmes designed to inspire the engineers and scientists of the future. Last year, around 6,500
young people discovered more about energy through National Grid employees, and thousands more visited our website www.nationalgrideducation.co.uk. In the US, we face similar challenges in attracting top quality, well trained candidates so we can maintain the number and quality of our workforce. Over the next 10 years, we expect to fill a significant number of
management roles that require an engineering background, delivering a number of initiatives similar to those in the UK.
 We also completed the third year of our engineering pipeline programme, which aims to inspire
promising students to become engineers and provide them an opportunity for fast tracked employment with National Grid. During the year we selected 40 high calibre, high school students into the programme. Stimulating innovation Encouraging and adopting new ideas helps us to work efficiently and effectively. This in turn helps us to access investment and growth
opportunities as well as to engage with our regulators. It is essential to efficiently deliver what is required. New sources of funds This year we issued more than £5 billion in new bonds and other debt to raise new capital as well as to refinance maturing debt.
As we continue to invest in our networks and other assets, we will need to raise new financing in the future. To attract good pricing for our debt and maintain a strong balance sheet, we consider different options for how and where to do this. Over the past year we achieved two firsts for National Grid. We issued our largest maple bond  one that is issued by a foreign company in the Canadian market for Canadian investors. We achieved a
nominal amount of C$750 million  the largest ever corporate maple bond at the time  and followed this two months later with a second maple bond with a nominal amount of C$400 million. We also issued our first hybrid bonds, achieving nominal amounts of £1 billion and
1.25 billion  both with very good pricing. A hybrid bond has certain characteristics of both debt and equity and, as a result, is treated by our rating agencies as half
equity and half debt in their analysis. This in turn helps us maintain our credit ratings, while securing the funding we need. LOGO


LOGO






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Strategic Review

What did we achieve?

Continued



UK innovation initiatives We have commissioned a study highlighting a least cost route to how the UK can meet its 2020 renewable and 2050 carbon targets. The study
paid particular attention to heat and described the transitional and long-term role gas has to play as part of a balanced approach. The analysis has been adopted by DECC and has been used extensively in the development of the governments heat
policy paper The Future of Heating: Meeting the Challenge, published in March 2013. We have been involved in a project that is
investigating the feasibility of injecting hydrogen gas, generated from electrolysis fed from excess renewables, into the UK gas networks. The project includes preliminary research into the application for the UK market and the creation of a
generation simulation model. This aims to identify the possible scale of production and financially viable production facilities, as well as options for use. We are also a partner in the European Gas Research Group, investigating the safe transportation, network developments and implications for
customer appliances of hydrogen enriched natural gas. We have continued to make good progress on developing the T-pylon and reached a
major milestone this year by erecting the first full size prototype suspension pylon in January followed in April by the tension pylon. We are now conducting mechanical tests to verify the pylons capabilities. You can read more about the
project in our T-pylon blog, available on our website. Our partnership with Manchester University in the UK has seen the
development of an electrically insulating composite cross arm for transmission pylons. In future this may allow us to increase the voltage on overhead lines from 275 to 400 kV without replacing the existing pylons with taller structures. Smart grid pilot in Massachusetts We received approval of our $43.6 million (£27.8 million) smart grid pilot programme in August 2012. The pilot will be conducted in the US city of Worcester, Massachusetts. It will test customer acceptance of new technology,
ranging from new meters to devices on our grid, to in-home devices that should help them save energy. Plans are under way to open a
new sustainability hub that will provide customers with an opportunity to see new technology and find out more about environmental issues. In May 2012 we announced that we will participate in the Green Button initiative, a programme inspired by the White Houses challenge to the energy industry. It is a joint effort among several utilities, technology companies
and the federal government to help consumers save energy and money by providing access to standardised, routine, easy to understand data relating to their energy usage. We plan to offer Green Button to the 15,000 customers who will be included in our smart grid pilot in Worcester.
 LOGO Real-time information sharing In the US, we have developed new technology to help keep our community liaison employees up to date with near real-time information during
storms. Developed at a cost of less than $150,000, it displays information from many systems, from estimated restoration times to the location of crews, hospitals, schools and our lines, using a geographic mapping application. Using the same technology, we built a damage assessment application to help better forecast restoration times. Employees and contractors use
tablets or smartphones to collect information about parts of the system that are damaged. This information is instantly shared with our command centre and our jurisdictional presidents. It is also used to provide information to crews, which helps us
to provide quicker restoration responses. IdeasNet Our strategy recognises that innovation must go beyond new technologies, as we look to embrace continuous improvement within everything we do. During the year, we trialled programmes aimed at helping us improve the way we collaborate, share knowledge, generate ideas and
exchange good practices. This involved using online social tools, including IdeasNet, which encourages employees to submit ideas that will improve the efficiency and effectiveness of our processes. In the UK for example, many employees responded to a challenge to find ways of digging fewer and smaller holes as part of the work we do in our
Gas Distribution business. A number of these ideas have been taken forward to the next stage of development.








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Engaging externally We work with external stakeholders to shape energy policy as these decisions directly affect our business. We seek to understand the expectations
of all our stakeholders so we can deliver a service that meets their needs. Regulatory agreements In the UK, we have agreed all the price control arrangements Ofgem has proposed for RIIO. In the US, we reached agreement on our rate case filings
in Rhode Island and New York. We expect to file our next round of rate cases in 2014, including filings for our electricity business in Massachusetts and our downstate gas businesses in New York. More details on these filings can be found
on pages 172 to 175. Our objective is to have the right cost of service with the ability to earn a fair and reasonable rate of return while providing a safe and reliable service to customers. Powering Britains Future In the UK, we have launched a nationwide conversation about the challenges we face in delivering the energy infrastructure the country needs and
minimising the impacts on communities and the environment. Our Powering Britains Future campaign aims to raise awareness about
the scale of the energy challenge facing the UK and find common ground with stakeholders and the public so we can work together to find solutions. The campaign started with a stakeholder forum in London, bringing together senior representatives from bodies including the Campaign to Protect Rural England, the consumer group Which? and the National Trust, as well as industry and
government leaders. You can find out more about the campaign at www.poweringbritainsfuture.co.uk. Our Brussels office In 2012, we
opened an office in Brussels to give us a closer insight into the evolution of EU policy and legislation in the energy sector.  LOGO
 Talking networks Consulting with the people who have a stake in what we do has always been fundamental to National Grid. In preparing for the new UK regulatory framework RIIO, we wanted to make sure we fully understood our stakeholders priorities and could take
their views into account when shaping our delivery plans. We have continued our talking networks initiative to gather
views from consumers, government, the energy sector and environmental organisations through workshops, surveys, meetings and forums. We have published the outcome of our consultations on the talking networks section of our website, describing
the feedback we received and the action we are taking as a result. Stakeholder engagement is an enduring approach that will continue
through the RIIO period and beyond. Through talking networks we continue to encourage our stakeholders to let us know how we are doing, how they would like to engage with us and where we should focus our resources. Doing the right thing Conducting
our business in an ethical manner is extremely important to us and at the heart of our policy of doing the right thing. We were very disappointed when we fell short of the standards we expect during some interactions with New York state
employees. Following our disclosure to and continued cooperation with regulators, we agreed to pay a fine of $1.67 million to NYPSC. We have updated our internal policies and enhanced our business ethics training to help prevent a recurrence.
We have also completed an independent review of our ethics and compliance programme. The Joint Commission on Public Ethics has not yet concluded its review of this matter. Engaging customers in the US Our
US tagline  Here with You, Here for You  reflects our renewed commitment to customers and local communities. In 2012, we engaged with customers at nearly 280 local events, including county fairs in New York,
Massachusetts and Rhode Island. Through these events, we highlighted our legacy in each respective community and talked to customers about safety and energy efficiency. We are confident that, because of our ongoing presence, customers view us as a
local company with deep roots in our communities.


LOGO






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Strategic Review

What did we achieve?

Continued



Embedding sustainability By embedding sustainability into our decision-making we aim to create value, preserve natural resources and respect the interests of our
communities. Our approach to sustainability has involved developing our long-term strategy under the banner of Our Contribution. This
responds to external drivers and input from stakeholders, drives efficiency, supports growth and profitability, and aims to:  

build a culture of sustainability within our organisation; and 

integrate sustainability into our decision-making and everyday activities, so we can protect and preserve natural resources, as well as respect the interests of the communities in which
we operate. Through our sustainability summit we worked with many of our external stakeholders to discover and
define our long-term ambition for National Grids climate change, sustainability and environmental strategy. The initial programme to deliver Our Contribution builds on projects developed through the summit. Among the initiatives has been the launch of a competition for our UK suppliers. We have challenged them to find innovative ways of implementing
the principles of the circular economy, promoted by the Ellen MacArthur Foundation, into the design of the materials, plant, processes and equipment they supply to us. We have robust investigation and remediation programmes to clean up waste. We also have controls in place to minimise or mitigate
releases to the environment during remediation activities. These range from containment to spill response contracts and equipment. We
called on these controls following a spill of suspected gas condensate and oily water in the Paerdegat Basin area of Brooklyn, New York during our operations there. We engaged a clean up contractor to clean out an affected sewer and used
sweeps and booms to capture floating material in the basin. We will also consider whether a longer-term sampling and remediation effort is needed. Our actions and investigations continue but we may be subject to financial penalties as a
result of this incident. LOGO
 Climate change This year our business units have continued their focus on reducing greenhouse gas emissions and we remain on target to achieve our 2020 and 2050
targets of a 45% and 80% reduction in emissions. We measure and report our emissions of the six Kyoto greenhouse gases using the
methodologies set out in the WRI/ WBCSD Greenhouse Gas Protocol: A Corporate Accounting and Reporting Standard (Revised Edition). Our total Scope 1 and 2 greenhouse gas emissions (excluding line losses) for 2012/13 were around 8.2 million tonnes carbon dioxide equivalent, representing a 58% reduction compared with our 1990 baseline. This equates to an
intensity of 569 tonnes per £million of revenue. Our Scope 1 and 2 greenhouse gas emissions are independently verified; a copy
of the verification statement is available on our website. We have continued our investigations into new technology
and processes in areas such as capturing SF6 emissions and replacements for SF6 used in switchgear, where promising alternatives include CF3I (trifluoroiodomethane) and vacuum circuit breaker technology. As SF6 is 23,900 times more potent than
CO2 any reduction or elimination will play a significant role in future emission reduction programmes. Our Gas Distribution mains
replacement programmes in the UK and US have continued to deliver a reduction in emissions due to gas leaks in line with expectations. In the UK, investment in pressure management equipment and an increased focus on system operating pressures
has also helped reduce leakage. In the US, we have completed the first phase of a project designed to identify vulnerable redundant
oil filled electrical assets and remove them from the system. Our US electricity generation operations have also been incorporated into our US environmental management system, further extending the coverage of our operations certified to
the international standard ISO 14001. Driving growth Growing our core businesses and developing future new business options depend on delivery of our investment plans. Combining this with operational
and procurement efficiencies contributes to our ability to achieve strong returns and meet our commitment to investors. Capital expenditure in the UK Capital expenditure in the UK this year was £2.5 billion. Much of this work involves asset replacement but there are also a number of new
initiatives. Two significant projects we have been working on are the Western Link and London power tunnels. Western Link:The Western Link is a joint project with SP
Transmission, part of Iberdrola Group. It will bring renewable energy from Scotland to homes and businesses in England and Wales, via a pair of HVDC cables, approximately 422 kilometres long, between Hunterston in Scotland and Deeside in North
Wales. The cable will travel for 385 kilometres under the Irish Sea before coming ashore on the Wirral and travelling underground to Deeside.








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At present, the Scotland and England power transmission networks are connected by two overhead
power lines and some smaller 132 kV circuits across the boundary which are of limited capacity. The Western Link will provide a further connection, easing pressure on the existing bottlenecks and helping to bring more renewable energy
through the system. A contract valued at more than £1 billion has been let by the joint venture to a consortium which will
design, manufacture and construct the link. Planning applications and easements are in progress and work has started on site. The project is expected to become operational in 2016. Upgrading to natural gas in New York We have begun work on a project to connect our existing distribution systems in Brooklyn and Queens, New York  the first pipeline to be
installed in the area in 50 years. Known as the Brooklyn/Queens Interconnect, it will help meet future energy needs for customers. This project will allow for more conversions to natural gas. The additional capacity will give New York City property owners a lower-cost
alternative as they consider ways to comply with the citys Clean Heat initiative, which we support. Power supply agreement with
LIPA We have a new agreement with LIPA that we filed with FERC that when effective will give Long Island better options for
updating and modernising our power plants through repowering existing facilities while reducing energy costs, further improving environmental performance, and removing uneconomic generation. This is an important part of the effort to enhance
the overall efficiency of Long Islands power supply resources.  LOGO
 Strategic workforce planning To help drive growth, we need to consider our long-term workforce needs. Our strategic workforce planning approach allows us to look ahead up to
ten years and forecast these needs, based on our business plans and an ageing workforce. In the UK, the approach has allowed us to plan for RIIO, identifying any gaps we may have in terms of skills and experience to meet new ways of working
under the new regulatory arrangements. We are now taking the same strategic workforce planning approach in our US business, beginning
with our network strategy and operations teams. In 2012, we implemented a global workforce planning analytics tool and expect to develop our plans further by building on what we have learnt in the UK. Clean Line investment In
November 2012 we announced a $40 million equity investment, of which $12.5 million was invested in 2012/13, in Clean Line, a developer of long distance, HVDC transmission projects to move renewable energy to market. This investment provides an
avenue into a potential growth market for us. Carbon capture and storage Carbon capture and storage (CCS) is an innovative technology designed to capture, transport and permanently store carbon dioxide emissions beneath
the seabed. The UK is well placed for the deployment of CCS technology as there are clusters of power generation and industrial
carbon dioxide emitters with nearby storage. At National Grid, we are looking to use our high pressure gas pipeline and wider project experience to create the initial infrastructure for CCS. By doing this, we believe we can demonstrate its potential
and provide a basis for deployment. During 2012/13, we have secured a storage site in the North Sea which has the capacity to
support a network in the Yorkshire and Humber region and potentially beyond  we are now further appraising the site to confirm its suitability. We have also consulted further on the proposed onshore pipeline route and have identified
sites for above ground infrastructure. Power stations and industry in the Yorkshire and Humber area produce around 15% of the
countrys carbon dioxide emissions. So, the decarbonisation of this cluster would bring significant benefits to the UK and help meet statutory targets to reduce greenhouse gas emissions by 80% by 2050.


LOGO






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Strategic Review Measuring performance  our KPIs    Financial KPIsStrategic
element #

KPI

DefinitionAll

Total
shareholder return

Average of the
closing daily TSR levels for the 30 day period up to and including that date, assuming dividends have been reinvestedAll

Adjusted
earnings per share

Adjusted earnings~
divided by the weighted average number of sharesAll

Group return on
equity

Adjusted earnings~
with certain regulatory- based adjustments divided by equityStimulate innovation: drive growth

Regulated controllable operating costs

Regulated controllable operating costs, excluding bad debts, as a proportion of
regulated assets   We measure the achievement of our objectives, make operational and investment decisions and reward our employees using both
qualitative assessments and quantitative indicators. To provide a full and rounded view of our business, we use non-financial as well as financial measures. Although all these measures are important, some are considered to
be more significant than others, and these are designated as KPIs.  KPIs are used to measure our progress on strategic priorities, aligning with those activities that combine to deliver our strategy. Non-financial KPIs are often leading indicators of future financial performance as improvements
in these measures build our competitive advantage, for example through attractive regulatory arrangements and in competition for future growth opportunities. Financial KPIs are trailing indicators of the success of past initiatives and specific
programmes. They also highlight areas for further improvement and allow us to ensure our actions are culminating in sustainable long-term growth in shareholder value.

LOGOWe have started a review to determine whether the current
Group KPIs remain relevant under RIIO, as the way our allowed revenues are calculated and how they will vary according to our actual performance has changed. 
It is possible that this may lead to increased volatility in our statutory revenue figures or some changes to the balance between operating
and capital expenditure in the business. We will report on the new KPIs when they have been agreed by the Board. 
Commentary on our overall financial results can be found on pages 46 to 57, and information on the performance and financial results of
each business area is set out on pages 18 to 25.

#    Refers to the six elements of our strategy: operational excellence; engage our
people; stimulate innovation; engage externally; embed sustainability; and drive growth 
~    Adjusted earnings exclude exceptional items, remeasurements and stranded cost
recoveries 
    Comparative data has been restated for the effect of the bonus element of the
rights issue and the scrip dividend issues à    From continuing operations
*    Rebased for rights issue
   Prior years have been restated for consistency
D   Prior
 years have been restated on a constant currency basis








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Non-financial KPIsStrategic element

KPI

DefinitionDeliver operational excellence

Employee lost time injury frequency rate

Number of employee lost time injuries per 100,000 hours worked on a 12 month basisDeliver operational excellence

Network reliability targets

Various definitions appropriate to the relevant business areaEngage our people

Employee engagement index

Employee engagement index calculated using responses to our employee surveyDeliver operational excellence

Customer satisfaction

Our position in customer satisfaction surveysEmbed sustainability

Greenhouse gas emissions

Percentage reduction in greenhouse gas emissions against our 1990 baseline  LOGO  Network reliabilityPerformance


Measure


Target2008/09


2009/10


2010/11


2011/12


2012/13





2012/13Electricity transmission  UK



99.9999



99.9999



99.9999



99.999999



99.99999



%



99.9999Gas transmission  UK


100



100



100



100



100



%



100Gas distribution  UK


99.9999



99.999



99.999



99.999



99.999



%



99.999Electricity transmission  US



266



147



414



518
(i)


346



MWh losses



*Electricity distribution  US



114



114



123



121



105
(ii)


Minutes of outage



**Targets
are set jurisdictionally by operating company (i) 2011/12 result restated to reflect final data.
(ii) 2012/13 result excludes New Hampshire which was sold during the year. See pages 22 and 37 for additional details on Elevate 2015 and network reliability, respectively  Customer satisfactionPerformance (quartile)





Measure


Target2009/10


2010/11

2011/12


2012/13UK Gas Distribution


4th


4th


3rd



3rd



Quartile ranking



ImproveGas distribution  US:
Residential


3rd


2nd


3rd



3rd



Quartile ranking



ImproveGas distribution  US:
Commercial


2nd


4th


3rd



4th



Quartile ranking



ImproveElectricity  US: Residential



4th


3rd


3rd



3rd



Quartile ranking



ImproveElectricity  US: Commercial


3rd


2nd


2nd



3rd



Quartile ranking



Improve


LOGO






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Strategic Review Financial review Financial performance   ContentsFinancial performance47

Measurement of financial performance47

Key performance indicators (KPIs)47

Other performance measures48

Earnings48

Timing48

Major storms49

Adjusted earnings49

Exceptional items49

Commodity remeasurements49

Exceptional finance costs and other remeasurements49

Stranded cost recoveries49

Exceptional taxation49

Taxation49

Tax strategy49

Total tax contribution49

Tax transparency50

Tax losses50

Development of future tax policy50

Use of adjusted profit measures50

Exchange rates51

Reconciliations of adjusted profit measuresFinancial position and resources52

Summarised statement of financial position52

Goodwill and intangibles52

Property, plant and equipment52

Investments and other non-current assets53

Current assets53

Current liabilities53

Deferred tax liabilities53

Provisions and other non-current liabilities53

Net debt55

Net pension and other post-retirement obligations57

Off balance sheet items57

Commitments and contingencies57

Going concern    LOGO
 LOGO Andrew Bonfield
Finance Director 
Introduction 
This year has seen good financial performance across our business. Notwithstanding the impact of major storms in the US, we have seen a year of
record adjusted operating profits. Adjusted earnings per share at 56.1p has increased by 12%, reflecting solid operational performance across all our regulated businesses and driven by increased revenue from RPI indexation and the rollover of the
transmission price control in the UK and increased deferral recoveries in upstate New York in the US. Adjusted earnings also benefited from a lower effective tax rate and flat net finance costs, partially offset by increased costs for the
implementation of our new enterprise resource planning system in the US and other higher operating costs. 
In the coming year, we will seek to extract additional value from the investments we have been making through our transformation programmes
and restructurings, our focus on end-to-end process improvements and our new US back office system. Coupled with the new RIIO price controls in the UK and the rate plans agreed in New York and Rhode Island in the US, we are well positioned for the
future.  Our confidence in the outlook for the Group has allowed
the Board to agree a new dividend policy to grow the dividend at least in line with RPI inflation each year for the foreseeable future. Our dividend is an important part of our returns to shareholders along with growth in the value of the asset
base attributable to equity holders.  Continuing to deliver an
attractive, growing dividend while maintaining a strong balance sheet are key targets for us in the coming years. We aim to do this through growth in assets, earnings and cash flows, supported by improved cash efficiency. Together with robust
regulatory frameworks we are confident that we can maintain strong, stable credit ratings and a prudent level of gearing, while delivering attractive returns to shareholders.LOGO  Andrew Bonfield








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Measurement of financial performance We principally discuss our results on an adjusted basis. The rationale for using adjusted measures is explained on page 50. Results on an adjusted
basis are presented before exceptional items, remeasurements and stranded cost recoveries. See pages 50 and 51 for further details and reconciliations from the adjusted profit measures to IFRS, under which we report our financial results and
position. Key performance indicators (KPIs) Our financial KPIs are set out on page 44. Details of the total shareholder return (TSR) and adjusted earnings per share have been discussed in
the financial review  in brief section on pages 06 and 07. Group return on equity We measure our performance in generating value for our shareholders by dividing our annual return by our equity base. Group ROE has increased in the year to 11.2%, reflecting our focus on driving efficient growth in our business. The increased return in 2012/13
was driven by higher revenues in the UK, due to inflation and other allowances in our price controls, higher US deferrals income and lower taxes due to a reduction in UK corporation tax rates and changes to tax provisions. Offsetting
these, the return in 2012/13 was constrained by the impact of major storms in the year. Excluding these major storm costs, 2012/13 ROE was 11.7% (2011/12: 11.3%; 2010/11: 10.8%). LOGO Regulated controllable operating costs We measure regulated controllable operating costs as a proportion of our regulated assets, as measured by our UK RAV and our US rate base. This ratio reduced to 6.6% in 2012/13, compared with 6.8% in 2011/12 and 7.3% in 2010/11 on a constant currency basis, reflecting our
continued focus on cost optimisation (particularly in our US business) and our continued efficient investment in regulated assets.
 Other performance measures Return on capital employed RoCE
is designed to provide a performance comparison between our regulated UK and US businesses and is one of the measures that we use to make strategic and investment decisions around our portfolio of businesses. The table below shows the RoCE for our businesses over the last three years:  RoCE

Years ended 31 March2013
%

2012
%

2011
%UK
regulated

8.8

8.6

8.5US regulated

7.1

6.8

7.1 The UK RoCE has increased from 8.6% to 8.8% in 2012/13 mainly due to the benefits of inflation on our RPI-X price
controls together with strong performance under incentive schemes and the decrease in the UK corporation tax rate from 26% to 24%. The increase in the US RoCE from 6.8% to 7.1% is primarily due to increased deferral recoveries for Niagara Mohawk.
Excluding the impact of major storm costs, the US RoCE would have been 7.7%, an increase of 0.1% compared with 2011/12 (7.6%). Interest cover In order to
continue to deliver sustainable growth, we remain disciplined in the way we manage our balance sheet. The principal measure we use to monitor financial discipline is interest cover, being a measure of the cash flows we generate compared with the net
interest cost of servicing our borrowings. The table below shows our interest cover for the last three years:  Years ended 31 March2013
times

2012
times

2011
timesInterest cover

3.9

3.9

3.8 Interest cover for 2012/13 has remained the same at 3.9 times, reflecting flat finance costs year on year. The primary reasons for the increase in 2011/12 were a fall in finance costs driven by interest rates on short-term instruments
combined with benefits from our 2010/11 debt buy back programme partially offset by a small decrease in our operational cash inflows for the year. Our target long-term range for interest cover is between 3.0 and 3.5, which we believe is consistent with single A range long-term senior unsecured debt credit ratings within our main UK operating companies, National Grid
Electricity Transmission plc (NGET plc) and National Grid Gas plc (NGG plc). Some of our regulatory agreements impose lower limits for
the long-term senior unsecured debt credit ratings that certain companies within the group must hold or the amount of equity within their capital structures. These requirements are monitored on a regular basis in order to maintain compliance. One of
the key limits requires National Grid plc to hold an investment grade


LOGO






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Strategic Review

Financial review

Continued



long-term senior unsecured debt credit rating. We believe our aim of maintaining single A range
long-term senior unsecured debt credit ratings within our main UK operating companies is consistent with this. Further details on credit ratings can be found on the debt investors section of our website. Dividends and dividend cover The proposed total ordinary dividend for 2012/13 amounts to £1,494 million or 40.85 pence per ordinary share. This represents an increase of 4% over the previous years ordinary dividend per share of 39.28 pence.  Years ended 31 MarchDividends

2013pence

2012pence

2011pence

2010pence

2009    penceInterim

14.49

13.93

12.90

13.65

12.64Final

26.36

25.35

23.47

24.84

23.00Total

40.85

39.28

36.37

38.49

35.64Dividendsper ADS

$

$

$

$

$Interim

1.15

1.10

1.02

1.15

0.95Final

2.01

2.02

1.90

1.77

1.74Total

3.16

3.12

2.92

2.92

2.69 Dividends expressed in dollars per ADS in the table above reflect the amounts paid or payable to ADS holders,
rounded to two decimal places. The final dividend proposed in respect of each financial year is reported in the financial statements
for the following year. Therefore, the proposed final dividend for 2012/13 of 26.36 pence per share, amounting to approximately £967 million (assuming all dividends are settled in cash), will be reported in the financial statements
for the year ending 31 March 2014. Dividend cover  Years ended 31 MarchTotal ordinary dividends covered by:

2013
times

2012
times

2011    timesAdjusted earnings

1.4

1.3

1.4Earnings

1.5

1.5

1.8 Scrip take up  Dividend

Proportion taking up scrip2010/11 final

34%2011/12 interim

7%2011/12 final

48%2012/13 interim

35%
 Earnings The following chart shows the five year trend in adjusted profit attributable to equity shareholders of the parent (adjusted earnings) and
adjusted earnings per share. LOGO In accordance with IAS 33, all earnings per share and adjusted earnings per share amounts for comparative
periods have been restated as a result of shares issued via scrip dividends and the bonus element of the rights issue. Diluted
adjusted earnings per share and diluted earnings per share are shown in the table below:  Years ended 31 March2013pence

2012pence

2011    penceAdjusted diluted earnings per
share

55.8

49.7

49.3Diluted earnings per share

62.3

55.4

60.9 Timing As discussed on page 16, our allowed revenues are set in accordance with our regulatory price controls or rate plans. We calculate the billing
rates we charge our customers based on the estimated volume of energy we believe will be delivered during the coming period. The actual volumes delivered will differ from this estimate and therefore our total actual revenue will be different from
our total allowed revenue. These differences are commonly referred to as timing differences. If we collect more than the allowed level of revenue, the balance must be returned to customers in subsequent periods, and if we collect less than the
allowed level of revenue we may recover the balance from customers in subsequent periods. In addition, in the US, a substantial portion of our costs are pass-through costs (including commodity and energy efficiency costs) and are fully recoverable
from our customers. Timing differences between costs of this type being incurred and their recovery through revenue are also included in timing. The amounts calculated as timing differences are estimates and subject to change until the variables
that determine allowed revenue are final. Our operating profit for the year includes an estimated in year over collection of
£16 million (2011/12: £18 million; 2010/11: £274 million) and our closing balance at 31 March 2013 was £126 million over-recovered. All other things being equal, the majority of that balance would normally
be returned to customers in the following year. Major storms In 2012/13, two major storms in the US, Superstorm Sandy and Storm Nemo, had a material effect on the results of National Grid. These two major
storms reduced operating profit by £136 million. In 2011/12, results were also affected by two major storm events, Tropical Storm Irene and the October 2011








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snowstorms in Massachusetts, which reduced operating profit in 2011/12 by £116 million. There
were no major storms in 2010/11. The table below shows adjusted operating profit and operating profit excluding the impact of timing
differences and major storms.  Years ended 31 MarchExcluding the impact of timingdifferences and major storms

2013£m


2012£m


2011  £mAdjusted operating
profit


3,764



3,593



3,326Operating profit


3,874



3,637



3,471 Adjusted earnings The significant drivers affecting our adjusted earnings including impacts on adjusted operating profit, adjusted net interest charge and adjusted
tax charge have been discussed in the financial review  in brief section on pages 06 and 07. Exceptional items Exceptional charges of £84 million in 2012/13 consisted of restructuring costs of £87 million less a gain on sale of our EnergyNorth gas business and Granite State electricity business in New Hampshire of
£3 million. Exceptional charges of £122 million in 2011/12 consisted of restructuring charges of
£101 million, environmental charges of £55 million and impairment charges of £64 million, offset by net gains on the disposals of subsidiaries of £97 million and other net gains of £1 million. Exceptional charges of £350 million in 2010/11 consisted of restructuring costs of £89 million,
environmental charges of £128 million, impairment costs and related charges of £133 million and other charges of £15 million, offset by net gains on disposals of three subsidiaries and an associate
of £15 million. Commodity remeasurements Remeasurements on commodity contracts represent mark-to-market movement on certain physical and financial commodity contract obligations in the
US. 2012/13 included a gain of £180 million (2011/12: loss of £94 million; 2010/11: gain of £147 
million). Exceptional finance costs and other remeasurements There were no exceptional finance costs in 2012/13 or 2011/12. There were £73 million of exceptional finance costs during 2010/11
relating to the early redemption of debt following the rights issue in June 2010, offset by £43 million of exceptional interest income relating to tax settlements in the US. Financial remeasurements relate to net gains and losses on
derivative financial instruments, 2012/13 included a gain of £68 million (2011/12: £70 million loss; 2010/11: £36 million gain). Stranded cost recoveries Stranded cost recoveries were substantially recovered in prior years, the £14 million recognised in 2012/13 represents the release of an unutilised provision recognised in prior years related to the disposed plants
(2011/12: £260 million; 2010/11: £348 million). Exceptional taxation Taxation related to exceptional items, remeasurements and stranded cost recoveries changes each year in line with the nature and amount of
transactions recorded.
 In addition, exceptional tax from 2012/13 included an exceptional deferred tax credit of
£128 million arising from a reduction in the UK corporation tax rate from 24% to 23% applicable from 1 April 2013. Similar reductions in the UK corporation tax rate in 2011/12 from 26% to 24% and in 2010/11 from 28% to 26%
resulted in £242 million and £226 million deferred tax credit respectively. More information on exceptional
items, remeasurements and stranded cost recoveries can be found in note 3 to the consolidated financial statements on page 112. Taxation Tax strategy We manage our tax affairs in a proactive and responsible way in order to comply with all relevant legislation and minimise reputational risk.
We have a good working relationship with all relevant tax authorities and actively engage with them in order to ensure that they are fully aware of our view of the tax implications of our business initiatives. Responsibility for our tax strategy
rests with the Finance Director and the Global Tax and Treasury Director who monitor our tax activities and report to the Finance Committee. Total tax contribution We have taken the decision to provide additional information on our
total UK tax contribution. The total amount of taxes which we pay and collect in the UK year on year is significantly more than the corporation tax which we pay on our UK profits. Within the total, we include significant other taxes paid such as
business rates and taxes on employment together with employee taxes and other indirect taxes. For 2012/13 our total tax contribution
to the UK Exchequer, inclusive of taxes collected and taxes borne, was £1.2 billion. Taxes borne by the Company directly in 2012/13 were £678 million, a 12% increase on taxes borne in 2011/12 of £603 million, due to
higher corporation tax payments in the current year. Our 2011/12 total tax contribution was £1.1 billion. The Hundred Groups 2012 Total Tax Contribution Survey ranked National Grid as the 16th highest contributor of UK tax. The
most significant amounts making up the 2012/13 amount were as follows: LOGO Tax transparency The UK tax charge for the year disclosed in the accounts in accordance with accounting standards and the UK corporation tax paid during the year
will differ. For transparency, we have included a reconciliation on page 50 of the tax charge for the income statement to the UK corporation tax paid in 2012/13.


LOGO






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Strategic Review

Financial review

Continued



The tax charge for the Group as reported in the income statement is £624 million
(2011/12: £521 million). The UK tax charge as per note 5 to the accounts is £332 million (2011/12: £175 million) and UK corporation tax paid was £243 million (2011/12: £170 million), with the
principal differences between these two measures as follows:  Years ended 31
MarchReconciliation of UK total tax charge peraccounts note 5 to UK corporation tax paid

2013£m


2012  £mTotal UK tax charge per accounts note 5 (current tax £289 million (2012: £181 million) and
deferred tax £43 million (2012: £6 million credit))


332



175Adjustment for non cash deferred tax items


(43
)


6Adjustments for accounts current tax charge relating to prior years


17



5UK current tax charge


306



186UK corporation tax instalments not payable until following year


(155
)


(92)UK corporation tax instalments of prior years paid in current year


92



76UK corporation tax paid


243



170 Tax losses We have total unrecognised deferred tax assets in respect of losses of £335 million (2011/12: £362 million) of which
£319 million (2011/12: £353 million) are capital losses in the UK. These losses arose as a result of the disposal of certain businesses or assets and may be available to offset against future capital gains in the UK. Development of future tax policy We believe the continued development of a coherent and transparent tax policy in the UK is critical to help drive growth in the economy. As a
result, we are actively contributing to the development of tax policy by engaging with government officials to promote sustainable investment. We also contribute to research into the structure of business taxation and its economic impact by contributing to the funding of the Oxford University Centre for Business Taxation at the Saïd Business School. We are a member of a number of industry groups which participate in the development of future tax policy, including the Hundred Group, which
represents the views of Finance Directors of FTSE 100 companies and several other large UK companies and of which our Finance Director is Chairman of its Tax Committee. This helps to ensure that we are engaged at the earliest opportunity on taxation
issues which affect our business.
 Use of adjusted profit measures In considering the financial performance of our businesses and segments, we analyse each of our primary financial measures of operating profit,
profit before tax, profit for the year attributable to equity shareholders and earnings per share into two components. The first of
these components is referred to as an adjusted profit measure, also known as a business performance measure. This is the principal measure used by management to assess the performance of the underlying business. Adjusted results exclude exceptional items, remeasurements and stranded cost recoveries. These items are reported collectively as the second
component of the financial measures. Note 3 on page 111 explains in detail the items which are excluded from our adjusted profit
measures. Adjusted profit measures have limitations in their usefulness compared with the comparable total profit measures as they
exclude important elements of our financial performance. However, we believe that by presenting our financial performance in two components it is easier to read and interpret financial performance between periods, as adjusted profit measures are
more comparable having removed the distorting effect of the excluded items. Those items are more clearly understood if separately identified and analysed. The presentation of these two components of financial performance is additional to, and not a
substitute for, the comparable total profit measures presented. Management uses adjusted profit measures as the basis
for monitoring financial performance and in communicating financial performance to investors in external presentations and announcements of financial results. Internal financial reports, budgets and forecasts are primarily prepared on
the basis of adjusted profit measures, although planned exceptional items, such as significant restructurings, and stranded cost recoveries are also reflected in budgets and forecasts. We separately monitor and disclose the excluded items as a
component of our overall financial performance. Reconciliations of adjusted profit measures to the total profit measure,
that includes both components can be found on page 51. Exchange rates Our financial results are reported in sterling. Transactions for our US operations are denominated in dollars and so the related amounts that
are reported in sterling depend on the dollar to sterling exchange rate. As the average rate of the dollar at $1.57:£1 in 2012/13 was stronger than the average rate of $1.60:£1 in 2011/12, the same amount of revenue, adjusted
operating profit and operating profit in dollars earned in 2011/12 would have been reported as £150 million, £21 million and £22 million higher respectively if earned in 2012/13. In 2010/11, the average rate was
$1.57:£1; if the revenue, adjusted operating profit and operating profit in dollars recognised in 2010/11 was earned in 2011/12 it would have been reported as £135 million, £21 million and £26 million lower
respectively. The balance sheet has been translated at an exchange rate of $1.52:£1 at 31 March 2013 ($1.60:£1
at 31 March 2012).








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Reconciliations of adjusted profit measuresReconciliation of adjusted
operating profit to total operating profit




Reconciliation of adjusted
earnings per share to earnings per shareAdjusted operating profit is presented on the face of the income statement under the
heading operating profit before exceptional items, remeasurements and stranded cost recoveries.




Adjusted earnings per share is presented in note 6 to the consolidated financial
statements.Years ended 31 MarchYears ended 31 March






2013


2012


20112013
£m


2012
£m


2011
£m






pence


pence


penceAdjusted earnings per share


56.1



50.0



49.6Adjusted operating
profit


3,644



3,495



3,600




Exceptional items


2.0



4.7



(0.5)Exceptional
items


(84
)


(122
)


(350)




Remeasurements


4.3



(3.3
)


6.2Remeasurements
 commodity contracts


180



(94
)


147




Stranded cost recoveries


0.2



4.2



5.9Stranded cost
recoveries


14



260



348




Earnings per share


62.6



55.6



61.2Total operating
profit


3,754



3,539



3,745Reconciliation of adjusted
operating profit to adjusted earnings and earnings  Adjusted
earnings is presented in note 6 to the consolidated financial statements, under the heading adjusted earnings.

Reconciliation of
adjusted operating profit excluding timing differences and major storms to total operating profit 
Adjusted operating profit excluding timing differences and adjusted operating profit excluding timing differences and major storms are discussed
on pages 48 and 49.Years ended 31 March2013
£m


2012
£m


2011
£mAdjusted operating
profit


3,644



3,495



3,600







Years ended 31 MarchAdjusted net finance costs


(920
)


(917
)


(1,134)







2013£m



2012£m



2011  £mShare of post-tax results of joint ventures


18



7



7




Adjusted operating profit excluding timing differences and major storms


3,764



3,593



3,326Adjusted profit before tax


2,742



2,585



2,473




Major storms


(136
)


(116
)


Adjusted taxation


(686
)


(755
)


(722)




Adjusted operating profit excluding
timing differences


3,628



3,477



3,326Adjusted profit
after tax


2,056



1,830



1,751




Timing differences


16



18



274Attributable to non-controlling interests


(1
)


(2
)


(4)




Adjusted operating profit


3,644



3,495



3,600Adjusted earnings
 Exceptional items
 Remeasurements
 Stranded cost
recoveries


2,055 
75 
156 
9



1,828 
174 
(122 
156
)


1,747 
(16) 
219 
209




Exceptional items, remeasurements and stranded cost recoveries


110



44



145Total operating profit


3,754



3,539



3,745Earnings


2,295



2,036



2,159


LOGO






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Strategic Review Financial review Financial position and resources   Summarised statement of financial position  As
at 31 March2013£m


2012  £mGoodwill and intangibles


5,617



5,322Property, plant and equipment


36,592



33,701Investments and other non-current assets


753



687Pension assets


195



155Current assets*


3,201



2,611Current liabilities*


(3,282
)


(3,155)Deferred tax liabilities


(4,076
)


(3,738)Provisions and other non-current liabilities


(3,644
)


(3,652)Net debt


(21,429
)


(19,597)Pensions and other post-retirement obligations


(3,694
)


(3,088)Net assets


10,233



9,246  *
Excludes amounts related to net debt and provisions reported in other lines and includes assets and liabilities of businesses held for sale Goodwill and intangibles Goodwill and intangibles increased by £295 million to £5,617 million as at 31 March 2013. This increase primarily relates to foreign exchange movements of £266 million and software additions of
£175 million offset by amortisation of £101 million. In 2011/12, goodwill and intangibles increased by £45 million to £5,322 million as a result of software additions offset by amortisation and the
impairment of the acquisition-related intangible asset of £64 million. This related to the contract to operate and maintain the electricity distribution network on behalf of LIPA, which will not be renewed on
expiry in December 2013. Property, plant and equipment Property, plant and equipment increased by £2,891 million to £36,592 million as at 31 March 2013. This was principally
due to capital expenditure of £3,511 million on the extension of our regulated networks and foreign exchange movements of £680 million, offset by £1,281 million of depreciation in the year. Property, plant
and equipment increased by £1,745 million to £33,701 million for the year ended 31 March 2012 due to capital expenditure of £3,172 million partially offset by £1,212 million of depreciation
and net disposals of £279 million, primarily the disposal of OnStream in October 2011.
 The table below shows our capital expenditure, including expenditure on both property, plant and
equipment and intangibles, over the last five years, by segment. The largest area of organic growth is in the UK Transmission segment, and we expect that to remain the case for the next few years.  LOGO Capital expenditure increased in each of the three regulated businesses including record amounts in our UK
Transmission and US Regulated businesses. As a result of capital expenditure in 2012/13, and after allowing for depreciation, foreign
exchange movements and in the UK, inflation, we estimate that our regulated assets have increased by approximately £2.5 billion (2011/12: £1.5 billion). Investments and other non-current assets Investments and other non-current assets have increased by £66 million to £753 million. This is principally due to changes in the
fair value of our US commodity contract assets and available-for-sale investments, and an equity investment in Clean Line Energy Partners LLC of $12.5 million by 31 March 2013. For the year ended 31 March 2012, investments and other
non-current assets decreased by £41 million to £687 million principally due to a £58 million decrease in the fair value of our US commodity contract assets driven by a fall in electricity prices partially offset
by an increase in other receivables.








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Current assets Current assets have increased by £590 million to £3,201 million at 31 March 2013. Driven by the US, this primarily
reflects the timing of cost recoveries from LIPA relating to Superstorm Sandy and an increase in trade receivables due to colder weather in February and March 2013 compared with 2012, which also led to an offsetting decrease in inventories
which were £85 million lower. For the year ended 31 March 2012, current assets decreased by £211 million to £2,611 million. This was due to a fall in trade receivables of £230 million, primarily
reflecting the impact of warmer weather in March 2012 on our US Regulated segment revenues. Current
liabilities Current liabilities have increased by £127 million to £3,282 million due to increased payables and
accruals relating to Superstorm Sandy and Storm Nemo. Current tax liabilities were £152 million lower primarily due to higher tax payments made in 2012/13 and larger prior year tax credits arising in 2012/13, although these were partially
offset by a larger current year tax charge. For the year ended 31 March 2012, current liabilities decreased by £286 million to £3,155 million. Trade payables were £190 million lower, reflecting the impact of lower
commodity prices in our US Regulated segment. Current tax liabilities were £120 million lower primarily due to tax payments made in 2011/12. Deferred tax liabilities The net deferred tax liability increased by
£338 million to £4,076 million. The main reasons for this movement were the £508 million deferred tax charge, including the impact of the reduction in the statutory tax rate for future periods of
£128 million, partially offset by the deferred tax credit on actuarial losses on pensions and other post-retirement benefits. For the year ended 31 March 2012, the deferred tax liability decreased by £28 million to
£3,738 million. This decrease mainly arose from the deferred tax charge for the year of £381 million being more than offset by the £403 million deferred tax credit arising on actuarial losses relating to pensions and
other post-retirement benefits. Provisions and other non-current liabilities Provisions and other non-current liabilities decreased slightly by £8 million to £3,644 million as at 31 March 2013.
Total provisions increased by £29 million in the year. The underlying movements include additions of £92 million and £83 million to the environmental and other provisions respectively, as well
as foreign exchange movements of £65 million. The other provisions additions include £33 million of increased liabilities insured by our insurance subsidiaries. These are offset by payments of £231 million in
relation to all classes of provisions. Other non-current liabilities have decreased by £37 million reflecting changes in the fair value of US commodity contract liabilities. For the year ended 31 March 2012, provisions and other
non-current liabilities decreased by £106 million to £3,652 million. Additions to environmental provisions were £58 million primarily due to revisions to our cost estimates. This was offset by payments
in relation to provisions totalling £228 million.
 Net debt Funding and liquidity risk management Funding and liquidity risk management is carried out by the treasury function under policies and guidelines approved by the Finance Committee of the Board. The Finance Committee is responsible for the regular review
and monitoring of treasury activity and for the approval of specific transactions, the authority for which fall outside the delegation of authority to management. The primary objective of the treasury function is to manage our funding and liquidity requirements. A secondary objective is to manage the
associated financial risks, in the form of interest rate risk and foreign exchange risk, to within pre-authorised parameters. Some examples of the management of funding and liquidity are given on page 33 and details of the main risks
arising from our financing and commodity hedging activities can be found in the risk factors discussion starting on page 176 and in notes 30 and 31 to the consolidated financial statements. Surplus funds Investment
of surplus funds, usually in short-term fixed deposits or placements with money market funds that invest in highly liquid instruments of high credit quality, is subject to our counterparty risk management policy. Net debt trend  LOGO The trend in net debt as shown in the chart above highlights our rights issue in June 2010 and the significant
capital expenditure programme we have had in the last few years. Composition of net debt Net debt is made up as follows:  As at 31 March2013 £m


2012  £mCash, cash equivalents and financial
investments


6,102



2,723Borrowings and bank overdrafts


(28,095)



(23,025)Derivatives


564



705Total net debt


(21,429)



(19,597)


LOGO






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##### Table of Contents





Strategic Review

Financial review

Continued





The increase in net debt of £1,832 million to £21,429 million is explained in
the chart below:  LOGO Factors decreasing net debt Our primary source of cash relates to operating cash flows as detailed separately below. Factors increasing net debt Our primary use of cash is for capital expenditure and other investing activities. This has increased by £214 million year on year primarily due to increased investment in our UK Transmission business. We also utilised
cash for dividends which decreased by £196 million year on year. The decrease in cash dividends is due to significantly higher scrip take up in the year compared with 2011/12. This is offset by the growth in the dividend. Net
interest paid was £38 million higher than prior year, reflecting higher average net debt during the year. Tax paid was £28 million higher than prior year primarily due to higher taxable profits. Non cash movements related
to increases in the value of inflation linked debt and remeasurements and movements in the sterling to dollar exchange rate. Operating cash flows   LOGO Cash flows from our operations are largely stable over a period of years. Our electricity and gas
transmission and distribution operations in the UK and US are subject to multi-year rate agreements with regulators. In the UK, we have largely stable annual cash flows. However, in the US our short-term cash flows are dependent on the price of gas
and electricity and the timing of customer payments. The regulatory mechanisms for recovering costs from customers can result in significant cash


flow swings from year to year. Changes in volumes in the US, for example as a consequence of abnormally mild or extreme weather or economic conditions affecting the level of demand, can
affect cash inflows in particular. For the year ended 31 March 2013, cash flow from operations decreased by
£450 million to £4,037 million as detailed on page 07. For the year ended 31 March 2012, cash flow from operations decreased by £367 million to £4,487 million due to lower operating profits,
unfavourable working capital movements, higher pension payments and lower stranded cost recoveries. The increase of
£482 million in 2010/11 to £4,854 million was due to higher operating profits and lower pension payments. Borrowings The Finance
Committee controls refinancing risk by limiting the amount of our debt maturities arising from borrowings in any one year which is demonstrated by our maturity profile. The maturity profile of gross borrowings by our major entities is illustrated below:  LOGO






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During the year we continued to refinance where attractive opportunities arose, including issuing
our first hybrid bonds worth £2.1 billion in March 2013. In total, we received £5.1 billion of proceeds from new loans and debt issuance, including a C$750 million bond in NGET in September 2012, and 1.25 billion and £1 billion from the hybrid bonds in NGG Finance in March 2013. We also repaid a total of £1.2 billion of borrowings during the year. As at 31 March 2013, total borrowings of £28,095 million (2012: £23,025 million) including bonds, bank loans, commercial
paper, finance leases and other debt had increased by £5,070 million representing our new loans and debt issuances in the year. We expect to repay £3,448 million of our maturing debt in the next 12 months including
commercial paper and we expect to be able to refinance this debt through the capital and money markets. Further information on
borrowings can be found on the debt investors section of our website and in note 19 of the consolidated financial statements. Derivatives  2013£m


2012  £mInterest rate swaps


303



187Cross-currency interest rate swaps


512



740Foreign exchange forward contracts


(48
)


59Forward rate agreements


(5
)


(5)Inflation linked swaps


(198
)


(276)Total as at 31 March


564



705 We use derivative financial instruments to manage our exposure to risks arising from fluctuations in interest
rates and exchange rates. We value our derivatives by discounting all future cash flows by externally sourced market yield curves at the reporting date, taking into account the credit quality of both parties. The decrease in our derivatives of
£141 million therefore represents movements as a result of underlying market variables and the composition of the derivative portfolio. The currency exposure on our borrowings is managed through the use of cross-currency swaps and results in a net debt profile post-derivatives that is almost entirely sterling/dollar. The impact on net debt from our use of derivatives can be seen in the currency and interest rate profiles shown below:  LOGO
 The interest rate profile of net debt is actively managed under the constraints of our
interest rate risk management policy as approved by the Finance Committee. Our interest rate exposure, and therefore profile, will change over time. The chart below shows the interest rate profile of our net debt before derivatives.  LOGO We have invested some of the proceeds from the issuance of our hybrid bonds in short-term money funds at
floating interest rates. As a result, we are currently in a net asset position on floating instruments and our exposure is shown as a negative in the chart above. The charts below show the impact, as at 31 March 2013, of derivatives on our net debt for 2013/14 and future years. The 2013/14 position
reflects the use of derivatives, including forward rate agreements to lock in interest rates in the short term. The effective interest rate on treasury managed debt for the year was 5.1% (2011/12: 5.4%). The future years position excludes
derivatives that mature within the next year.  LOGO Further details on our foreign currency and interest rate risk management can be found in the risk factors
discussion on pages 33 and 177 and in note 30(a) of the consolidated financial statements. Net pension and
other post-retirement obligations We operate pension arrangements on behalf of our employees in both the UK and US and also provide
post-retirement healthcare and life insurance benefits to qualifying retirees in the US. In the UK, the defined benefit section of the
National Grid UK Pension Scheme and the National Grid Electricity Group of the Electricity Supply Pension Scheme are closed to new entrants. We have started discussions with our employees and our trade union partners to ensure our defined benefit
pension schemes are affordable and sustainable for the future. Membership of the defined contribution section of the National Grid UK Pension Scheme is offered to all new employees in the UK. We are currently reviewing the defined contribution
arrangement we offer to employees and new hires in the UK.


LOGO






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Strategic Review

Financial review

Continued







In the US, we operate a number of pension plans, which provide both defined benefits and defined
contribution benefits. We also provide post-retirement benefits other than pensions to the majority of employees. Benefits include healthcare and life insurance coverage to eligible retired employees. Pension plan assets are measured at the bid market value at the reporting date. Plan liabilities are measured by discounting the best estimate of
future cash flows to be paid out by the plans using the projected unit method. Estimated future cash flows are discounted at the current rate of return on high quality corporate bonds in UK and US debt markets of an equivalent term to the liability. A summary of the total UK and US assets and liabilities and the overall net IAS 19 accounting deficit is shown below:  Net plan liability

UK
£m


US
£m


Total
£mAs at 1 April 2012


(668
)


(2,265
)

(2,933)Exchange movements






(112
)

(112)Current service cost


(90
)


(130
)

(220)Expected return less interest


66



3


69Curtailments, settlements and other


(15
)


(45
)

(60)Actuarial gains/(losses) on plan assets


1,028



148


1,176 on plan liabilities


(1,691
)


(415
)

(2,106)Employer contributions


201



486


687As at 31 March 2013


(1,169
)


(2,330
)

(3,499)Represented by:Plan assets


17,392



5,893


23,285Plan liabilities


(18,561
)


(8,223
)

(26,784)Net plan liability


(1,169
)


(2,330
)

(3,499) The principal movements in net obligations during the year arose as a consequence of a decrease in the discount
rate following declines in corporate bond yields. Actuarial gains on plan assets reflected improvements in financial markets. Plan
assets are predominantly invested in equities, corporate bonds, gilts, property and short-term investments. Our plans are trustee administered and the trustees are responsible for setting the investment strategy and monitoring fiduciary investment
performance, consulting with us where appropriate.


The investment profile of our pension plan assets is illustrated below:   LOGO Further information on our pension and other post-retirement obligations, including details of
the actuarial valuations that are performed for our UK pensions can be found in note 29 to the consolidated financial statements. Actuarial valuation of UK pensions A triennial valuation is carried out for the trustees of
our two UK defined benefit schemes by professionally qualified actuaries and agreed with us following consultation. The next full actuarial valuations of both the National Grid UK Pension Scheme and the National Grid Electricity Group of the
Electricity Supply Pension Scheme are to be performed as at 31 March 2013 with the valuation results expected to be agreed by mid 2014. Further detail on the results of the last full triennial valuations performed as at 31 March 2010 can be found in note 29 to
the consolidated financial statements.






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##### Table of Contents

Off balance sheet items There were no significant off balance sheet items other than the contractual obligations shown in note 30(d) to the consolidated
financial statements, and the commitments and contingencies discussed below. Commitments and
contingencies The following table summarises the commitments and contingencies outstanding at 31 March 2013 and 2012.  2013    £m


2012
£mFuture capital expenditure contracted but not provided for


3,011


2,728Operating lease commitments


742


706Energy purchase commitments


3,995


4,174Guarantees and letters of credit


1,332


1,344 The increase in capital expenditure contracted but not provided for is a result of the continued ramp up in
our capital investment programme. The energy purchase commitments reflect obligations to purchase energy under long-term contracts.
These contracts are used in respect of our normal sale and purchase requirements and do not include commodity contracts carried at fair value. Substantially all our costs of purchasing electricity and gas supply for our customers are recoverable at
an amount equal to cost. The timing of recovery can vary between financial periods leading to an under- or over-recovery within any particular financial period (see timing differences as discussed on page 48). We propose to meet all our commitments, as well as working capital requirements, from existing cash and investments, operating cash flows,
existing credit facilities, future facilities and other financing that we reasonably expect to be able to secure in the future. Through the ordinary course of our operations, we are party to various litigation, claims and investigations. We do not expect the ultimate
resolution of any of these proceedings to have a material adverse effect on our results of operations, cash flows or financial position. Further information on commitments and contingencies can be found in note 27 to the consolidated financial statements.
 Going concern 
Having made enquiries, the Directors consider that the Company and its subsidiary undertakings have adequate resources to
continue in business for the foreseeable future, and that it is therefore appropriate to adopt the going concern basis in preparing the consolidated and individual financial statements of the Company. The Directors consider that a robust going
concern assessment process was undertaken and the results were discussed and challenged formally at the Audit Committee in May 2013, who recommended the Boards approval at the meeting in May 2013 prior to approving the Annual
Report and Accounts.  The process undertaken
involved consideration of the forecasts produced for the UK and US businesses for a period to March 2015. This period is considered to be the foreseeable future as required for this going concern assessment only, and is in accordance
with company law, accounting standards and the Listing Rules. The forecasts include the impact of the RIIO price control framework on our UK regulated businesses and the impact of agreed and ongoing rate plan filings with the relevant US state
and federal bodies for our US businesses. While we have forecasts that extend to the end of each of our current rate plans (for example until 2021 for the UK regulated businesses), we have not considered going concern formally for these
periods, due to the increased forecasting risk and uncertainty involved. 
This assessment also considered the significant solvency and liquidity risks involved in delivering our forecasts for the
foreseeable future. These are wider than the current global economic uncertainty and include recognising the risks around the continued significant investment programme that the Group has committed to and the potential risk that the credit ratings
on some of our issued debt are changed. Any change would increase the cost of servicing this debt, therefore reducing the overall profitability of the Group. The assessment also considered the Groups ability to obtain additional funding across
a number of scenarios reflecting the current economic uncertainty, especially in Europe. This analysis also noted the fact that the debt markets remained a viable source of funding for the Group even at the height of the credit crunch in 2007 and
2008. Given the significance of maintaining our overall credit rating, the Group has policies and procedures in place to help mitigate this risk as far as possible, as described on page 33. Additional oversight is also provided by the Finance
Committee (see page 66).  More detail on our
financial risks, including liquidity and solvency, is provided in note 30 to the consolidated financial statements. There have been no major changes to the Groups significant liquidity and solvency risks in the year.


LOGO






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Corporate Governance Corporate Governance  LOGO  Chairmans
foreword  As part of the Board transition
programme I reported last year, Nora Mead Brownell, Mark Williamson and Jonathan Dawson have joined our Board. We said goodbye to Stephen Pettit and Linda Adamany in 2012, with Ken Harvey and George Rose stepping down from the Board following the
conclusion of this years AGM.  On behalf
of the Board, I would like to thank Ken and George for their commitment to the Company and the valuable contribution they have made as Non-executive Directors  they have carried out their duties with diligence and care. Ken has been Senior
Independent Director since 2004 and Remuneration Committee chairman since 2011, while George has been chairman of the Audit Committee for more than ten years. These are important roles in ensuring the Board meets its responsibilities to shareholders
and stakeholders. The Nominations Committee report on page 67 sets out the recruitment processes followed for our new Non-executive Directors. 
The fresh insight and external perspectives that Nora, Mark and Jonathan bring are complemented by the accumulated
Company knowledge and understanding that our longer serving Directors provide. With the changes in membership, skills, experience and dynamics arising from the refreshing of the Board, we felt it would be timely to undertake an external review of
the Board and its committees performance and effectiveness. The review was conducted with a focus on inclusion & diversity. Further details of the process, as well as examples of agreed actions, are set out on pages 60 and
61.  Following the publication of a new edition
of the UK Corporate Governance Code last autumn, we have produced this years Annual Report and Accounts in line with the updated requirements. This is part of our continuing commitment to best practice in corporate governance
and I am pleased to tell you that we comply in full with the new requirements as detailed in our compliance statement. 
Additionally, we have made some changes to the presentation, structure and content of the Annual Report and Accounts.
Our approach takes on board elements of the draft regulations on narrative reporting and directors remuneration, published by the Department for Business Innovation and Skills in the last year.
 I hope you find the changes helpful to your understanding
of our strategy and performance, as well as how these link to Directors remuneration. 
LOGO Sir Peter Gershon
Chairman
 Governance
contents58

Governance framework59

The Board59

The Board and its committees59

Board composition59

Director induction and development59

Non-executive Director independence60

Board evaluation and effectiveness60

Director election and re-election62

Board and committee membership and attendance63

Audit Committee66

Finance Committee66

Safety, Environment and Health Committee67

Nominations Committee68

Remuneration Report91

Shareholder engagement Governance framework  Compliance statement 
The Board considers that it complied in full with the provisions of the UK Corporate Governance Code 2010 (the Code) and,
additionally, the new edition of the UK Corporate Governance Code 2012 (the new Code) during the financial year being reported taking account of the transitional arrangements suggested by the Financial Reporting Council for external audit
tendering. This report explains key features of the Companys governance structure to provide a greater understanding of
how the main principles of the Code and the new Code have been applied and to highlight areas of focus during the year. The report also includes items required by the Disclosure and Transparency Rules. The index at the top of the next page sets
out where to find each of the disclosures required in the Directors Report. As required by the Code, our business model is explained starting on page 08. A full description of the matters reserved for the Board, together with other documentation relating to the Companys governance, is
available on our website. Examples of changes during the year On Stephen Pettits departure, the Risk & Responsibility Committee which he chaired was replaced by a new committee, the Safety,
Environment and Health (SEH) Committee chaired by Philip Aiken, to get a sharper focus on safety, environment and health matters. The areas of responsibility previously covered by the Risk & Responsibility Committee, and which are not
within the remit of the SEH Committee, including security, corporate responsibility (beyond the specific areas of safety, environment and health), business conduct and inclusion & diversity, are now within the remit of the Board and other
committees. Additionally, in line with common practice, the Executive Committee is no longer a committee of the Board, although its
levels of authority, role and responsibilities remain unchanged. For more information on the role and responsibilities of the Executive Committee, see page 28. In relation to compliance with the new Code, the Board has considered and endorsed the arrangements to enable it to confirm the Annual Report and
Accounts, taken as a whole, is fair, balanced and understandable and no changes to the assurance processes are required.








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##### Table of Contents

Directors Report statutory and other disclosures (starting on page indicated)91

Annual General Meeting

182

Conflicts of interest

53

Financial instruments

183

Political donations and180

Articles of Association

170

Contractual and other

08

Future developments



expenditure65

Audit information



arrangements

30

Internal control

08

Principal activities and26

Board of Directors

183

Directors indemnity

183

Material interests



business review182

Change of control

87

Directors share interests



in shares

183

Research andprovisions

48

Dividends

38

People



development182

Charitable donations

183

Events after the reporting

183

Policy and practice on

30

Risk management185

Code of Ethics



period



payment of creditors

183

Share capital  The Board The Board reserves a number of matters for its sole consideration where these matters impact the strategic direction, effective oversight and
reputation of the Company. Examples of Board focus during the year  

visible safety leadership and embedding genuine learning to help prevent repeat injuries through safety initiatives; 

RIIO and US rate cases; 

major storm activity lessons learnt; 

US foundation programme systems implementation; 

the 2013 strategic business plan assumptions; 

Electricity Market Reform, including future generation scenarios; 

Group financing strategy; 

the new dividend policy; 

refreshed corporate vision statement; 

results of 2012 employee opinion survey, including proposed high level actions to address key themes globally; and 

executive succession, including the results of external assessment and benchmarking of high performing individuals. Examples of expected Board focus for next year  

review of safety performance and initiatives; 

strategy sessions; 

change programmes in the UK business to reflect RIIO and Elevate 2015 in the US; 

UK security of supply; 

US foundation programme post systems implementation review; 

UK and US operational deep dives; 

talent management update, including regeneration of ageing workforce, capabilities, and inclusion & diversity; and 

results of 2013 employee opinion survey and proposed high level actions. The Board and its committees In order to operate efficiently and to give appropriate attention and consideration to
matters, the Board has delegated authority to its committees to carry out tasks as defined in the committees terms of reference, which are available on our website. Details about the workings of the Board and the committee
structure are set out in summary on pages 28 and 29 with reports from each Board committee together with details of their activities during the year on pages 63 to 90. The Executive Committee has responsibility for making management and operational decisions about the day-to-day running of the Company. Further
information on the membership and operation of the Executive Committee is included on pages 28 and 29. Board composition The phased and orderly transition of the Board has continued as detailed in the Chairmans foreword to this report, noting that Maria
Richter is expected to step down from the Board in July 2014. The Nominations Committee and the Board consider balance as a key requirement for the composition of the Board, not only in terms of the number of Executives and Non-executives, but also
with regard to the mix of skills, experience, knowledge, independence and diversity. Biographical and experience details for current Directors are set out on pages 180 to 182. The Directors during the year are set out on page 62 together with
details of committee membership and attendance. For further details regarding the Directors service contracts and letters of appointment, see pages 78 and 79 in the Remuneration Report.
 Director induction and development The Chairman, with the support of the Group General Counsel & Company Secretary, is responsible for the induction of new Directors and
ongoing development of all Directors. Personal development and training needs were discussed at the one-to-one meetings with the Chairman as part of the Board performance evaluation process. As the internal and external business environment changes, it is important to ensure the Directors skills and knowledge
are refreshed and updated regularly. Updates on corporate governance and regulatory matters are provided at Board meetings, with details of development opportunities available in our online document library.  Non-executive Directors induction programme
 On appointment to the Board, new Non-executive Directors
receive an induction programme including:      Directors information pack to provide background information on our businesses and operations, policies and procedures as well as guidance on statutory duties as a director and
other corporate governance matters;     one-to-one meetings with
other Directors and senior management in the UK and US; and
    operational site visits.
 Programmes are tailored depending on the experience and
background of each individual and the committees on which they serve. 
Recognising that Noras experience is predominantly in the US, her induction included a meeting with our external legal
advisors to discuss the duties and requirements of being a director in the UK. 
As Mark is chairman designate of the Audit Committee, he has met with members of senior management from the
finance team including the Finance Director, Group Financial Controller, Director of Corporate Audit and US Chief Financial Officer. He has also met with our external auditors, analysts and brokers.
 Jonathan has met our external remuneration advisors
and senior management involved with the Remuneration Committee as he will be taking over as committee chairman. His induction programme includes meetings covering the regulatory environment in which we operate and our
regulated businesses. Non-executive Director independence The independence of the Non-executive Directors is considered at least annually along with their character, judgement, commitment and performance
on the Board and relevant committees. The Board, in its deliberations, specifically took into consideration the Code and examples of indicators of potential non independence, including length of service. Following the annual evaluation of
independence, with a particularly rigorous review for those Directors who have served greater than six years, each of the Non-executive Directors, with the exception of the Chairman, at year end has been determined by the Board to be
independent. The experience and knowledge of Ken Harvey, George Rose and Maria Richter, who have each served on the Board for
more than nine years, have been key to the orderly succession of our Board, facilitating a structured handover and continuity during this period of change.


LOGO






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Corporate Governance

Corporate Governance

Continued



Board evaluation and effectiveness The Board agreed this year it would be beneficial and timely, given the changes in Board composition, to undertake an external evaluation of Board
and committee performance to provide fresh insight and objectivity to the process. Schneider Ross was appointed to conduct an evaluation of the Board and its committees, having previously provided inclusive leadership training to the Company in
2009. The Board agreed this previous relationship would not impact in any way the independence of the review. The Board recognises the
value of inclusive leadership and a diverse Board. In considering the review process this year, it noted the anticipated benefits to be gained by undertaking an external review from an inclusion & diversity perspective.   LOGO Schneider Ross held confidential one-to-one interviews with 24 people comprising Directors and members of
the leadership team. Mark Williamson and Jonathan Dawson did not participate due to the timing of their appointments. The focus for these discussions was on the behavioural aspects of Board effectiveness such as:  

how the Board works together as a unit; 

the quality of inputs, discussions and decision-making; 

the leadership demonstrated both individually and collectively; and 

specific themes, for example differences in perspectives between male and female Board members and more recently appointed Non-executive Directors were asked about their integration and induction
to the Board. Questionnaires were designed to gather views and feedback on the overall effectiveness, performance
and processes of the Board and each of the committees including the Executive Committee. Additionally this year, regular attendees of the Board and committee meetings were surveyed to gain a different perspective and a more holistic picture of
performance.
 In total 47 people, including regular attendees and two external advisors, were invited to
complete questionnaires anonymously online. Schneider Ross presented the key conclusions of the evaluation at a meeting of the
Nominations Committee with the Executive Directors present. Findings, which were debated openly, had been grouped into three themes:  

Mechanics: for example the role, composition and processes of the Board and its committees. 

Dynamics: such as teamwork, quality of discussions, debate and decision-making. 

Specifics: including leadership, succession planning, risk appetite and reporting, and inclusion & diversity. As a result of their evaluation, Schneider Ross commented: With the Board in the later stages of its transition, the boardroom dynamic continues to evolve. We have made a set of
recommendations which, taken together, we believe should drive progress towards a truly high performing, inclusive Board  where constructive challenge from a diverse group of Non-executive Directors makes its full contribution to excellent
decision-making. Each committee chairman was requested to prepare an action plan for their respective committee for presentation
to the April Board meeting. Noting the suggestions, the Board agreed areas of improvement and actions for further enhancements. Progress against all action plans will be monitored throughout the year; see table opposite for examples. In addition to the review by Schneider Ross and on receipt of its findings, Sir Peter met with each Board member to discuss their individual
performance, with the exception of Ken Harvey and George Rose as they will not be standing for re-election at this years AGM. Progress against the examples from the combined action plan reported last year, which includes items identified from the performance evaluation
process together with Sir Peters complementary review, is set out opposite. Director election and re-election At a private meeting of the Non-executive Directors, Ken Harvey, as Senior Independent Director, led a review of Sir Peters performance. In
their deliberations the Non-executive Directors, with input from the Executive Directors, assessed his ability to fulfil his role as Chairman. They concluded that Sir Peters performance and contribution are strong and that he demonstrates
effective leadership. Ken also met privately with Schneider Ross to discuss feedback on the Chairman obtained from their review, which Ken then discussed with Sir Peter. Following recommendations from the Nominations Committee, the Board considers all Directors continue to be effective, committed to their roles and
have sufficient time available to perform their duties. There have been no significant changes to Sir Peters commitments during the year and the arrangements he has in place to fulfil his role given he is also chairman of another FTSE 100
company are considered effective. Therefore, in accordance with the Code, all Directors, with the exception of Ken Harvey and George Rose, will seek election or re-election as set out in the Notice of the 2013 AGM.









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##### Table of Contents

Area

Actions for 2013/14Mechanics

Chief Executive to meet with Executive
Directors immediately after each Board meeting to discuss how the Board operated as a team and contributions from Directors, and reflect on any learning. Feedback from these meetings to be shared as appropriate with the Chairman.Responsibility:Chief ExecutiveReview and build on the one page
executive summary for non standard papers introduced in July 2012 and consider its effectiveness in providing the Board with key information and clarity around requested contribution or action.Responsibility:Chairman and Chief ExecutiveAll committees, except the Nominations
Committee and Executive Committee, to get together immediately before or after their meetings to discuss papers, presenters contribution and any matters they wish to consider without management present.Responsibility:Committee chairmenThinking styles of candidates to the
Board and Executive Committee to be taken into consideration once skill set and experience confirmed.Responsibility:Nominations
CommitteeDynamics

Schedule a development session for the
Board which may include thinking styles, inclusive leadership and exploring positive challenge through questioning techniques.Responsibility:Chairman and Group General Counsel & Company SecretaryReview the following months agenda
and communicate to the Executive Directors the areas that presenters are to focus on.Responsibility:Chairman and
Chief ExecutiveSpecifics

Facilitate increased interaction between
Non-executive Directors and high potential employees during site visits and presentations at Board meetings.Responsibility:Executive DirectorsAppoint a taskforce to review gender
diversity and employee turnover.Responsibility:Chief ExecutiveImplement an inclusion & diversity
scorecard and review progress with the Board.Responsibility:Executive
Committee  Area

Actions from 2012/13

CommentaryBoard and committee
performance evaluationMembershipand
attendees

During this period of Board transition,
membership of all committees is to be reviewed to ensure appropriate alignment of skills and knowledge.
Responsibility:Nominations Committee

As the Board transitions, committee
composition has been reviewed to ensure the right balance of skills and experience is maintained taking into account the role and responsibilities of the committee and the existing membership.Training and
development

Training and development is key for all
members of the Board. Formal training plans will be agreed between each Director and the Chairman.
Responsibility:Board members

A record of training and development
activities undertaken by Directors has been maintained throughout the year; for example external briefings and seminars, which have been complemented by technical and market updates to Board and committee meetings.Role
andstructure

To review the terms of reference and
remit of the Risk & Responsibility Committee, including the advice sought from external advisors.
Responsibility:Chairman, Chief Executive and Company Secretary
& General Counsel

The new SEH Committee focusing on safety,
environment and health issues only, was formed at the end of July 2012 in place of the broader Risk & Responsibility Committee. The new committee considered its external advisors. The additional areas previously reviewed by the Risk &
Responsibility Committee were reallocated between the Board, Audit Committee and Executive Committee.Complementary
reviewRole
andstructure

Enable the Board and its committees to
focus appropriately on addressing the key challenges and opportunities.

Together with the formation of the new
SEH Committee, agendas were updated having reviewed the frequency with which items should be considered during the year.Non-executiveDirectors

Facilitate an appropriate level of input
and constructive challenge from the Non-executive Directors.

To facilitate preparations for and input
to meetings, a secure online document library has been introduced providing access to Board and committee papers and reference materials.Role
andstructure

Establish more clarity about the levels
of assurance the Board needs in areas outside the remit of the Audit Committee.

A project is ongoing to review key data
provided to external parties and the associated assurance processes.Non-executiveDirectors

Increase Non-executive Director
engagement with the operations.

Following positive feedback, the
programme of Non-executive Director visits to Company sites in the UK and US will be continued.Role
andstructure

Increase the effectiveness of scrutiny
of operations and business processes.

The SEH Committee provides more focused
scrutiny of operations and business processes in relation to safety, environment and health.


LOGO






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Corporate Governance

Corporate Governance

Continued



Board and committee membership and attendance

Listed below is the Board and committee membership and attendance. Instances of non attendance during the year were considered and determined as being reasonable due to the individual circumstances. Should any Director be unable to
attend a meeting, the Chairman and committee chairman are informed and the absent Director is encouraged to communicate opinions and comments on the matters to be considered.



|                              |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|----------------------------- |  | -------- |  | --------------------------------------------------------------- |  | ---------------- |  | ------------------------ |  | ----------------------- |  | ----------------- |  | ------------------------ |  | 
|                              |  |          |  | Board and committee membership, attendance (i) and independence |  |                 
|                              |  |          |  |                                                                 |  |                  |  |                         
|                              |  | Board    |  | AuditCommittee                                                  |  | FinanceCommittee |  | Nominations    Committee |  | Remuneration  Committee |  | SEHCommittee (ii) |  | ExecutiveCommittee (iii) |  | 
|                              |  |         
|Non independent               |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Non-executive Chairman        |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Sir Peter Gershon             |  | 11 of 11 |  |                                                                 |  |                  |  | 7 of 7                   |  |                         |  |                   |  |                          |  | 
|Chief Executive               |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Steve Holliday                |  | 11 of 11 |  |                                                                 |  | 4 of 4           |  |                          |  |                         |  |                   |  | 3 of 3                   |  | 
|Executive Directors           |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Andrew Bonfield               |  | 11 of 11 |  |                                                                 |  | 4 of 4           |  |                          |  |                         |  |                   |  | 2 of 3                   |  | 
|Tom King                      |  | 11 of 11 |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  | 3 of 3                   |  | 
|Nick Winser                   |  | 11 of 11 |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  | 3 of 3                   |  | 
|                              |  |         
|Independent                   |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Non-executive Directors       |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Ken Harvey                    |  |          |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|(Senior Independent Director) |  | 11 of 11 |  |                                                                 |  |                  |  | 7 of 7                   |  | 6 of 6                  |  | 3 of 3            |  |                          |  | 
|Philip Aiken                  |  | 11 of 11 |  | 6 of 6                                                          |  |                  |  | 6 of 7                   |  |                         |  | 3 of 3            |  |                          |  | 
|Nora Mead Brownell (iv)       |  | 9 of 9   |  |                                                                 |  |                  |  | 5 of 6                   |  | 4 of 4                  |  | 3 of 3            |  |                          |  | 
|Jonathan Dawson (v)           |  | 1 of 1   |  |                                                                 |  |                  |  |                          |  |                         |  |                   |  |                          |  | 
|Paul Golby                    |  | 11 of 11 |  |                                                                 |  |                  |  | 7 of 7                   |  | 6 of 6                  |  | 3 of 3            |  |                          |  | 
|Ruth Kelly                    |  | 11 of 11 |  | 6 of 6                                                          |  | 4 of 4           |  | 7 of 7                   |  |                         |  |                   |  |                          |  | 
|Maria Richter                 |  | 11 of 11 |  | 6 of 6                                                          |  | 4 of 4           |  | 7 of 7                   |  |                         |  |                   |  |                          |  | 
|George Rose                   |  | 10 of 11 |  | 6 of 6                                                          |  |                  |  | 6 of 7                   |  | 6 of 6                  |  |                   |  |                          |  | 
|Mark Williamson (vi)          |  | 6 of 6   |  | 4 of 4                                                          |  | 2 of 2           |  | 5 of 5                   |  |                         |  |                   |  |                          |  | 
|                              |  |         
|Linda Adamany (vii)           |  | 6 of 6   |  | 3 of 3                                                          |  |                  |  | 3 of 3                   |  |                         |  | 1 of 1            |  |                          |  | 
|Stephen Pettit (viii)         |  | 4 of 4   |  |                                                                 |  | 2 of 2           |  | 1 of 1                   |  | 3 of 3                  |  |                   |  |                          |  | 
|                              |  |         
|Total number of meetings      |  | 11       |  | 6                                                               |  | 4                |  | 7                        |  | 6                       |  | 3                 |  | 3                        |  | 
|                              |  |         
|                              |  |         
|                              |  |         



|(i) | Attendance is expressed as number of meetings attended out of number possible or applicable for the individual Director.
|--- | ------------------------------------------------------------------------------------------------------------------------

|(ii) | The SEH Committee replaced the Risk & Responsibility Committee in July 2012. The Risk & Responsibility Committee held one meeting during the year, chaired by Stephen Pettit and
attended by all other members: Linda Adamany; Philip Aiken; Paul Golby and Ken Harvey.
|---- | -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

|(iii) | Meeting attendance is reported until June 2012, after which the Executive Committee ceased to be a committee of the Board.
|----- | --------------------------------------------------------------------------------------------------------------------------

|(iv) | Nora Mead Brownell was appointed to the Board on 1 June 2012.
|---- | -------------------------------------------------------------

|(v) | Jonathan Dawson was appointed to the Board on 4 March 2013.
|--- | -----------------------------------------------------------

|(vi) | Mark Williamson was appointed to the Board on 3 September 2012.
|---- | ---------------------------------------------------------------

|(vii) | Linda Adamany stepped down from the Board on 31 October 2012.
|----- | -------------------------------------------------------------

|(viii) | Stephen Pettit stepped down from the Board on 30 July 2012.
|------ | -----------------------------------------------------------



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##### Table of Contents

Audit CommitteeLOGO George Rose Committee chairman  Consistent with the early
adoption of the new Code, we have included additional information this year. We hope you find this helpful in better understanding the work of the committee. 
We have continued to closely monitor our US financial controls programme that began during the last financial year. Given the importance of this
project, in June, I and two of my fellow committee members met representatives from the US finance team for an update on the progress of preparations and training, ahead of the implementation of a new enterprise resource planning system.
 Following the reallocation of the responsibilities of the Risk &
Responsibility Committee at the end of July, the committees remit was expanded to include reporting on our standards of ethical business conduct. This aligns well with the other work the committee reviews on fraud, bribery and internal
controls.  During the year, we have said goodbye to Linda Adamany
and welcomed Mark Williamson to the committee. Mark has a wealth of financial experience and will take over as committee chairman when I stand down in July. To help with the handover of responsibilities, I felt it was important for the
committee, especially Mark, to be involved in the development of the committees action plan which stems from the results of this years performance evaluation review. Mark has already made a tangible contribution to the committee and I
have no doubt it will continue to perform effectively and evolve under his leadership.  LOGO George Rose 
Review of the year 
Some of the significant issues the Audit Committee considered in relation to the financial statements during the year are set
out below: 
   US financial controls programme;
   environmental provision;
   pensions; and
   recoverability and disclosure of storm costs.
 Examples of other matters the Audit Committee reviewed:
    the revised
corporate risk policy;    Sarbanes-Oxley Act 2002 (SOX Act) testing and
attestations;    data assurance processes and the programme to improve
the Company wide framework; and    business conduct reports, including
employee survey results in relation to questions on ethics, disciplinary statistics and activities of the business conduct committees.
 Experience The Board has determined that George Rose and Mark Williamson have recent and relevant financial experience and are suitably qualified audit
committee financial experts, within the meaning of the SEC audit committee financial expert requirements. The Board also considers George and Mark to be independent within the meaning of the New York Stock Exchange listing rules. Mark Williamson joined the committee on 3 September 2012 and will take over as chairman of the Audit Committee following the AGM
on 29 July 2013. A tailored induction programme has been developed, see page 59 for details. In support of this, Mark has been introduced to senior finance team members to enhance his understanding of the finance function. At Georges
invitation he also attended meetings in May 2013 between the committee chairman and management, and between the committee chairman and the external auditors to strengthen the transfer of knowledge and further develop key relationships. The composition of the committee during the year is set out on page 62, with biographical details and experience of members on pages
180 to 182 respectively. Financial reporting The committee monitors the integrity of the Companys financial information and other formal documents relating to its financial performance
and makes appropriate recommendations to the Board before publication. A key factor in the integrity of financial statements is
ensuring that suitable and compliant accounting policies are adopted and applied consistently on a year-on-year basis and across the Company. In this respect, the committee also considered the estimates and judgements made by
management when accounting for non-standard transactions, the treatment of exceptional items and in provision calculations. These
considerations are supported by input from other assurance providers, for example the group controls, risk management and ethics and compliance teams, corporate audit and the SEH Committee as well as our external auditors. In addition, the
committee also considers reports of the Disclosure Committee, see page 65 for more information. Summarised below are some of the
significant issues the committee considered in relation to the financial statements during the year. US
financial controls programme:An important milestone of the programme took place when we implemented a new enterprise resource planning system, which went live during November and December
2012. A status update was provided at the January committee meeting and initial findings on the lessons learnt, in particular in relation to payroll processing, were presented to the committee in March. At that meeting the committee discussed the initial findings and noted the Executive Committee would review in depth the lessons learnt
and how these could be applied across the business. An update will be provided to the Board in June this year.


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Corporate Governance

Corporate Governance

Continued



Environmental provision:at the half year and year end we reviewed the Companys environmental provision to ensure that it remained appropriate. A deep dive on the process of calculating the environmental provision
summarising the accounting requirements, the judgements involved in estimating environmental liabilities and how these change over the life of the site to which the liabilities relate, was presented at the September meeting. The committee noted the
report and agreed the environmental provision recognised is appropriate; no follow up action was required. Pensions:movements in the market value of plan assets and changes in economic assumptions, principally the discount rate, were noted along with their
consequential impact on net pension and other post-retirement liabilities. Input from external actuaries provided additional assurance over these assumptions. The committee noted the proposed accounting treatment and accepted the judgements of
management. Recoverability and disclosure of storm costs:the committee discussed the disclosures around the financial impact of Superstorm Sandy in our half year results statement, and the impact of storm costs on cash flows and working capital. The committee
noted the position in relation to these evolving disclosures with subsequent approval of the half year results by the Board. Confidential reporting procedures and whistleblowing The integrity of the financial statements is further supported by the confidential reporting and whistleblowing procedures in place. The committee reviews these procedures once a year to ensure that appropriate processes are in
place to treat complaints confidentially and implement proportionate, independent investigation in all cases. Internal (corporate)
audit The committee receives twice yearly reports on the control environment from the Director of Corporate Audit. These reports
highlight key improvement themes and recommend areas for business focus, with additional analysis provided around causal factors such as knowledge and responsibility transfer. In addition, the committee has visibility of management responsiveness in
addressing audit actions. The audit plan, which contains mandatory, risk-based and cyclical reviews, was approved by the committee in March 2012, and was built around focus areas such as organisational change, major system change, security and
business resilience, and capital spend. Corporate audit continue to plan on a risk-based approach for the majority of work, but have
introduced greater structure to the smaller cyclical element of their work programme to ensure coverage of key processes over a defined period. The inherent risk of each process is assessed and in turn is used to inform audit frequency, with
elements of higher risk processes being audited on a more frequent basis. The committee supports this approach which was used for the first time in developing the plan for the year ending March 2014.
 External audit The committee is responsible for overseeing relations with the external auditors, including the approval of fees, and
makes recommendations to the Board on their appointment and reappointment. Details of total remuneration for auditors for the
year, including audit services, audit related services and other non-audit services, can be found in note 2(e) of the consolidated financial statements on page 110. Auditor independence and objectivity The independence of the external auditors is essential to the provision of an objective opinion on the true and fair view presented in the financial statements. Auditor independence and objectivity is safeguarded by limiting
the nature and value of non-audit services performed by the external auditors, ensuring that employees of the external auditors who have worked on the audit in the past two years are not appointed to senior financial positions within the Company,
and the rotation of the lead engagement partner at least every five years. The current lead engagement partner has held the position for three years.  Non-audit services provided by the external
auditors  Non-audit services provided by the external auditors
require approval by the committee. Approval is given on the basis the service will not compromise independence and is a natural extension of the audit or if there are overriding business or efficiency reasons making the external auditors most suited
to provide the service. Certain services are prohibited from being performed by the external auditors, as required under the SOX Act. 
Total non-audit services provided by PwC during the year ended 31 March 2013 were £2.3 million (2012: £3.8 million) which
comprised 23% (2012: 44%) of total audit and audit related fees. Total audit and audit related fees include the statutory fee and fees paid to PwC for other services which the external auditors are required to perform, for example regulatory audits
and SOX Act attestation. Non-audit fees represent all other services provided by PwC not included in the above. 
Significant non-audit services provided by PwC in the year included quality assurance provided on the US financial controls improvement
programme (£0.7 million) and tax compliance services in territories other than the US (£0.5 million). 
PwC were engaged on the US financial controls improvement programme, as they were best placed to provide valuable insight on the programme, given
their in depth knowledge of our control environment and relevant utilities experience. They were appointed in an advisory capacity only and were not involved in designing or implementing new controls and processes, thereby helping to safeguard
independence and objectivity.  The committee considered that tax
compliance services were most efficiently provided by the external auditors as much of the information used in preparing computations and returns is derived from audited financial information. In order to maintain the external auditors
independence and objectivity, management reviewed and considered PwCs findings and PwC did not make any decisions on behalf of management.









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Audit quality To maintain audit quality and provide comfort on the integrity of financial reporting, the committee reviews and challenges the proposed external
audit plan to ensure that PwC have identified all key risks and developed robust audit procedures. The committee also considers PwCs response to accounting, financial control and audit issues as they arise, and meets with them at least
annually without management present providing the external auditors with the opportunity to raise any matters in confidence. Auditor
appointment An annual review is conducted by the committee of the level and constitution of the external audit and non-audit fees
and the effectiveness, independence and objectivity of the external auditors. The annual review includes consideration of:  

the external audit process globally; 

the auditors performance; 

the expertise of the firm and our relationship with them; and 

the results of questionnaires completed by National Grid employees engaged with the audit and members of the Audit Committee. Following this years annual review, the committee is satisfied with the effectiveness, independence and objectivity of the external
auditors, and recommend to the Board their reappointment for a further year. A resolution to reappoint PwC and giving authority to the Directors to determine their remuneration will be submitted to shareholders at the 2013 AGM. Audit tender PwC have been the
Companys external auditors since the merger with Lattice Group plc in 2002, having been the incumbent external auditors of both the merging parties. The new Code requires FTSE 350 companies to put the audit services contract out to tender at
least once every ten years, to enable the committee to compare the quality and effectiveness of the services provided by the incumbent auditors with those of other audit firms. Transitional arrangements provided by the Financial Reporting Council
indicate the Company should tender the audit, at the latest, at the time of the next audit partner rotation currently scheduled for 31 March 2015. We may, however, put the audit out to tender at any time before this date. There are no contractual obligations restricting our choice of external auditors and no auditor liability agreement has been entered into. Audit information Having made
the requisite enquiries, so far as the Directors in office at the date of the approval of this report are aware, there is no relevant audit information of which the auditors are unaware and each Director has taken all reasonable steps to make
themselves aware of any relevant audit information and to establish that the auditors are aware of that information.
 Internal control, risk and compliance We consider regularly the effectiveness of financial reporting, internal controls and compliance with applicable legal and internal requirements.
We also review the procedures for the identification, assessment, mitigation and reporting of risks. To continuously improve and
remain at best practice levels, the risk management team reviews risk standards, emerging trends and concepts being driven by the main consultancy firms and look to apply these as appropriate. The standards issued by the Committee of Sponsoring
Organizations of the Treadway Commission (COSO) and the international risk standard ISO 31000 are used to inform the principles of our risk management process as appropriate. Specific improvements delivered during the year, and ongoing, to address
key concepts within the standards were noted by the committee at its meeting in September. Details of our internal control and risk management systems, including over the financial reporting process can be found on pages 30 and 31 and page 179 with
our risk factors in full on pages 176 to 178. The changes to the compliance management process reported last year are now
embedded and continue to evolve. During the year the global ethics and compliance team has focused on promoting improved consistency across compliance reports and changes are being trialled in relation to fraud and bribery returns. The committee
received a paper on the Companys anti-bribery procedures and reviewed the adequacy of these. It noted that no material instances of non compliance had been identified and that progress continued on the minor improvements recommended to
the Board as a result of the prior years review. Disclosure Committee The role of the Disclosure Committee is to assist the Chief Executive and the Finance Director in fulfilling their responsibility for oversight of
the accuracy and timeliness of the disclosures made, whether in connection with our presentations to analysts, financial reporting obligations or other material stock exchange announcements. This year the committee met for the purposes of considering the announcements of the full and half year results and the interim management
statements and reported on the matters arising to the Audit Committee. In doing so it spent time considering the Companys disclosure obligations relating to RIIO, US rate filings and the effects of Superstorm Sandy. The committee also reports
the results of its evaluation of the effectiveness of the Companys disclosure controls to the Audit Committee. The committee is
chaired by the Finance Director and its members are the Group General Counsel & Company Secretary, the Global Director of Tax and Treasury, the Group Financial Controller, the Director of Investor Relations, the Director of Corporate Audit
and the Deputy Group General Counsel, with other attendees as may be appropriate.


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Corporate Governance

Corporate Governance

Continued



Finance CommitteeLOGOMaria Richter Committee
chairman  Following the departure of Stephen Pettit in July, we
have welcomed Mark Williamson and Jonathan Dawson to the Finance Committee.  This year we have continued to focus on funding plans to take into account international debt market conditions. The committee received regular reports on treasury, tax, insurance and pensions activities to keep us advised of
progress and we approved recommendations where appropriate. 
External advisors gave presentations relating to the eurozone crisis and the potential impact of worldwide derivatives legislation from the G20
Accord in Pittsburgh. Additionally, to ensure the committee was advised on the progress of transactions such as the issuance of Canadian dollar, US dollar and Hong Kong dollar bonds and floating-rate instruments, updates were circulated between
meetings.  Some items the committee considered and approved, due
to their nature, were also presented to the Board such as the renewal of the SEC debt shelf, a legal requirement, and the funding strategy. As a number of new Non-executive Directors have joined the Board over the year, a presentation on the
work and remit of the committee was given to the Board in April 2013. This was aimed at helping all Directors understand the role and responsibilities of the Finance Committee.
 LOGO  Maria Richter
 Review of the year
 Examples of matters the Finance Committee considered during the year
include:


long-term funding requirements, including the issuance of new hybrid bonds, the largest bond issue by us to date, and new maple
bonds, one of which was the largest corporate maple transaction of its kind in Canadian history at the time;


setting and reviewing treasury policies;


treasury performance updates provided at each meeting;


UK and US tax updates;


activities of the Energy Procurement Risk Management Committee in the US;


foreign exchange policy;


underlying financial assumptions in the business plan;


pensions updates including funding of the Companys pension deficits; and

insurance renewal strategy.
 Safety, Environment and Health CommitteeLOGOPhilip Aiken Committee
chairman  At the end of July last year, I was appointed as
chairman of the new Safety, Environment and Health (SEH) Committee which replaced the Risk & Responsibility Committee. The new committee focuses on these three areas in greater detail rather than looking at all non-financial risks and
compliance matters as its predecessor did. It also monitors investigations into, and measures taken following, major incidents. 
In terms of safety, we have looked at the trends in high potential incidents and how progress can be made in eliminating avoidable significant
injuries. We have also followed progress with the new process safety management system, introduced to improve management of the major hazard assets across our businesses.
 In relation to environmental matters, we have considered our strategy
and approach to sustainability following the sustainability summit held in September 2012. In particular, we have looked at how to replicate successful projects and share learning.
 We have continued to monitor the measures taken to promote the health and
wellbeing of our employees. This included a focus on mental wellbeing with the Elephant in the Room campaign, the introduction of fast track physiotherapy facilities and cardiovascular risk management programmes, encouraging employees to
increase their physical activity.  LOGO  Philip Aiken
 Review of the year
 Examples of matters the SEH Committee reviewed during the year
include:


safety training session focusing on effective safety discussions and process safety;


lessons learnt and steps taken following the
fatalities in the UK and US during 2011/12;


update on the UK safety strategy;


safety leadership initiatives implemented, such as senior employee safety days and unannounced safety visits;


in depth review of our approach to safety in the US,
and how this compares with our peers;


climate change strategy, including performance against emissions targets and carbon budgets; and

environmental incidents such as the Paerdegat Basin
spillage, see page 42.









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Nominations CommitteeLOGOSir Peter Gershon
Committee chairman 
As the phased transition of the Board has progressed, we have continued to focus on the relevant skills, knowledge and experience
required to create a balanced and effective Board. In selecting candidates for Non-executive Director appointments, we considered not only qualifications but independence, time commitment and how their personal attributes would complement and
enhance the diversity already on the Board.  Most recently,
Jonathan Dawson has joined the Board and he will take over as chairman of the Remuneration Committee when Ken Harvey steps down. Jonathan brings a wealth of corporate finance knowledge and significant plc board experience which we are confident will
enable him to contribute effectively to our Board.  In the search
for our new Audit Committee chairman to take over from George Rose, the balance between job experience and personal style was key, noting Mark Williamsons previous role as an audit committee chairman, international expertise and sector
experience together with his strong communication skills and personal motivation.  As reported last year, we welcomed Nora Mead Brownell to the Board. She has actively contributed to discussions, is willing to challenge during debates and brings to the table a wealth of US regulatory and utilities expertise which
has proved invaluable.  LOGO  Sir Peter Gershon
 Review of the year
 Examples of matters the Nominations Committee considered during the year
include:


succession planning, identified the core capabilities of a chief executive to align with the Companys future
strategic ambitions;


recommendation to the Board of the change in Company Secretary and Non-executive Director appointments;


approval of board diversity policy, see opposite column for details; and


review of Board and committee evaluation process and results, see page 60 for more information.
 Recruitment Processes 
Non-executive Directors
The recruitment processes undertaken for the appointment of Nora, Mark and Jonathan were formal, rigorous and transparent. The Nominations
Committee appointed an executive search consultancy, Spencer Stuart, JCA Group and Russell Reynolds Associates respectively, and the following process was undertaken:

a role profile was prepared against which potential candidates were considered;

from a long list of candidates, a shortlist of preferred candidates was selected;

Sir Peter Gershon and a minimum of two other members of the committee together with Steve Holliday interviewed the shortlisted candidates. Additionally, Andrew
Bonfield met the shortlisted candidates for the future Audit Committee chairman position;

the committee considered the candidates against the objective criteria set out in each profile, with due regard to diversity;

a preferred candidate recommendation was made by the committee to the Board for consideration and approval; and

the Board agreed to the appointments as recommended.Spencer Stuart, JCA Group and Russell Reynolds
Associates only provide recruitment consultancy services to the Company.  Board diversity and the Davies Review  The board
diversity policy reaffirms our aspiration to meet the target of 25% of Board positions to be held by women by 2015, as set out by Lord Davies and continues to support the engagement of executive search firms who have signed up to the Voluntary Code
of Conduct on gender diversity and best practice.  The Nominations
Committee is responsible for developing measurable objectives to support the implementation of the board diversity policy and for monitoring progress towards the achievement of these objectives.
 We currently have 21.4% women on our Board, which will change to 25% on the
departure of Ken and George, and 20% women on our Executive Committee. The Board expects the diversity of the executive and leadership population to improve by 2015. The number of women in management positions and throughout the organisation is set
out on page 39 along with initiatives to develop women and promote diversity throughout our organisation. 
Our executive and leadership population is regularly and rigorously assessed against achievement of individual objectives and key leadership
qualities to help build a sustainable development and succession plan.  We have a programme of executive sponsorship and mentoring of high potential female and minority ethnic managers in order to ensure increased diversity throughout our leadership.


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Corporate Governance

Remuneration Report

Pay policy report 2012/13







Remuneration CommitteeLOGO  Ken Harvey Committee
chairman  I am pleased to present the Remuneration Report for
2012/13. We have made no major changes to our remuneration policy during the year. However, you will find changes to the format of this years Remuneration Report where we have followed some of the key reporting principles from the draft
regulations published by the Department for Business, Innovation & Skills (BIS). The format of the report is, therefore, a policy report detailing the remuneration policy (pages 68 to 79) and an implementation report (pages 80 to 90) which
details the changes in the financial year, such as salary changes, Annual Performance Plan (APP) payments and vested Performance Share Plan (PSP) awards. 
While we have adopted some of the BIS principles on a voluntary basis this year, some elements of the draft regulations (at the time of going to
print) are subject to further amendment and therefore full adoption will be implemented in a future years report when the regulations become effective. 
Examples of new areas of disclosure to be found in this report include: the single figure table (page 83), the Chief Executives total
remuneration over the last five years (page 84) and the spend on Executive Director pay relative to key metrics (page 85). 
Our policy of relating pay to the Companys business priorities and its performance continues to be the strong principle underlying the
Remuneration Committees consideration of executive remuneration. 2012/13 was a year of good financial and operational performance. This included strong earnings growth, the approval of a number of important regulatory arrangements in the UK
and US, strong reliability performance



and continued delivery of the significant investment programme that will drive our long-term shareholder value. However, the implementation of our
enterprise resource planning system in the US did not proceed in the way envisaged. These things are taken into consideration when remuneration decisions are made. 
Overall, we aim to ensure the Company continues to attract, motivate and retain high calibre individuals to deliver the highest possible
performance for our shareholders and customers. We believe the mix of our remuneration package provides an appropriate and balanced opportunity for executives and their senior teams. Our incentive plans are reviewed annually to ensure
they remain closely aligned with the Companys strategic objectives and our shareholders interests, while continuing to motivate and engage the team leading the Company to achieve stretching targets.
 The remuneration framework for Executive Directors remains relatively
straightforward. Our incentive plans comprise of the APP with a compulsory share deferral element and the Long Term Performance Plan (LTPP). We have clawback provisions for both those plans in the event of financial misstatement. We have meaningful
share ownership requirements for Executive Directors which are exceeded in all cases (except for Andrew Bonfield who is building up his shareholding), and the dilution levels from our share plans remain well below prescribed limits. We operate a
mitigation policy in the event of early termination by the Company of an Executive Directors employment. 
Following the introduction of the new UK regulatory framework (RIIO  see pages 171 and 172 for further details), we have commenced a review
to assess its implications for our remuneration strategy and, in particular, to examine whether the performance measures used in the incentive plans align with the optimum outcome for National Grid and all our stakeholders. This work will continue
over the coming months and any changes will be presented to shareholders next year.  LOGO  Ken Harvey  Remuneration Committee The Remuneration Committee members are Ken Harvey, George Rose, Paul Golby, Nora Mead Brownell and Jonathan Dawson. Each of these
Non-executive Directors served throughout the year, except Nora and Jonathan who joined the Board on 1 June 2012 and 4 March 2013 respectively. Stephen Pettit stepped down from the Board and the Committee on 30 July 2012. The Global Human Resources Director and Global Head of Compensation & Benefits provide advice on remuneration policies and
practices and are usually invited to attend meetings, along with the Chairman, Chief Executive and Group General Counsel & Company Secretary. No Director or other attendee is present during any discussion regarding his or her own remuneration. As well as having regular meetings during the year, we have an annual review and strategy meeting where we review our
remuneration practices and incentive plans to ensure they remain aligned to the Companys strategic goals. We also
 take the opportunity to assess external trends and best practice, and undertake an in depth review of a particular remuneration element each year. Alignment of the remuneration policy with the Company strategy The Remuneration Committee aims to align the remuneration policy to our Company strategy and key business objectives. Therefore, the performance
criteria in our incentive plans, both short- and long-term, are designed to underpin the Company vision and strategy. When aligning
the remuneration policy to our strategic objectives, the Committee aims to ensure the policy reflects our shareholders, customers and regulators interests. In addition, the Committee ensures the policy adheres to our internal
control, risk and compliance processes.  LOGO








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Remuneration policy The Remuneration Committee determines remuneration policy and practices with the aim of attracting, motivating and retaining high calibre
Executive Directors and other senior employees to deliver value for shareholders, and high levels of customer service, safety and reliability in an efficient and responsible manner. The Remuneration Committee sets remuneration policies and practices
in line with the Companys strategy and best practice in the markets in which the Company operates. Remuneration policies continue to be framed around the following key principles:  Competitive package with cost management

Total rewards are set at levels that are
competitive in the relevant market. For UK-based Executive Directors, the primary focus is placed on companies ranked (in terms of market capitalisation) 11-40 in the FTSE 100. This peer group is considered to be appropriate for a large, complex,
international but predominately regulated business. For US-based Executive Directors, the primary focus is placed on US utility companies.Sustainable growth

A significant proportion of the Executive
Directors total reward should be performance based. Performance based incentives are earned through the achievement of demanding targets for short-term business and individual performance as well as long-term shareholder value
creation.  Incentive plans, performance measures and targets are
stretching and aligned as closely as possible with shareholders long-term interests.Motivation and risk management

Remuneration structures should motivate
employees to enhance the Companys performance without encouraging them to take undue risks, whether financial or operational. The Remuneration Committee is briefed on key remuneration policy changes affecting employees more generally in the
Company and depending on the scope of that change its approval is sought. Having this wider insight into remuneration practices across the Company means the Remuneration Committee can take this information into consideration when making decisions
about the Executive Directors remuneration. The key elements of the remuneration package for Executive Directors are shown in
the tables below:  SalaryPurpose and link to strategy

To attract, motivate and retain high
calibre Executive Directors and other senior employees to deliver value for shareholders, and high levels of customer service, safety and reliability in an efficient and responsible manner.Operation

Salaries are reviewed annually with
changes effective from 1 June. Business and individual performance, skills, the scope of the role and the individuals time in the role are taken into account when assessing salaries; as is market data for similar roles in the relevant
comparator group (see details in the table above).Opportunity

Salaries are targeted broadly at market
median and any annual increases are aligned fully with salary increases applied to other employees across the Company. 
Adjustments in excess of the above may be made where there is a significant change in responsibilities.Performance metrics

None, other than day-to-day performance
expectations in the role.Changes in the year

See Implementation report on page
80.Page

See page 80 and Table 1A on page 86,
footnote (i).


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Corporate Governance

Remuneration Report

Pay
policy report 2012/13

Continued



Annual Performance Plan (APP) including Deferred Share Plan (DSP)Purpose and link to strategy

To reward the achievement of annual
financial and strategic business measures, and the delivery of individual objectives.  Deferred element encourages long-term shareholding and discourages excessive risk taking.Operation

APPThe APP is designed to drive short-term performance against annual performance measures, variants of which are
cascaded down the organisation to all employees in the plan to provide a line of sight for employees to connect day-to-day activities with our vision, strategy and key financial and service provision metrics.
 For Executive Directors, 70% of the APP is based on performance against
financial measures and 30% on individual objectives.  The chairman
of the Audit Committee and a minimum of one member of the Safety, Environment and Health Committee are members of the Remuneration Committee and therefore they are able to provide input from those committees.
 The Remuneration Committee retains the right, in exceptional circumstances,
to reclaim any monies based on financial misstatement and/or the misconduct of an individual through means deemed appropriate to those specific circumstances. 
Awards for UK-based Executive Directors are not pensionable but, in line with current US market practice, US-based Executive Directors
awards are pensionable.DSP
50% of any award under the APP is deferred compulsorily into shares and held for three years before release, subject to forfeiture on leaving in
certain circumstances.  The Remuneration Committee may, at the time
of release of the shares, use its discretion to pay a cash amount equivalent to the value of the dividends that would have accumulated on the deferred shares. 
The deferred shares may be forfeited if the Executive Director ceases employment during the three year deferral period as a bad
leaver, for example resignation.  The Remuneration Committee
believes that requiring Executive Directors to invest a substantial amount of their APP award in National Grid shares increases the proportion of rewards linked to both short-term performance and longer term total shareholder return (TSR). This
practice also ensures that Executive Directors share a significant level of risk with the Companys shareholders and their interests are aligned.Opportunity

Maximum of 150% of salary.
 Achievement of target performance results in payment of 40% of the maximum
possible.Performance metrics

The financial measures of Company
performance in 2012/13 were adjusted EPS (see page 48 for further details) and consolidated cash flow. 
The main divisional measures were operating profit, UK ROE and US ROE targets, with some employees having slightly different targets depending on
their role and area of the business. For more details on return measures see page 07.  Individual objectives are defined in terms of target and stretch performance requirements, and change each year depending on strategic business priorities.
 When setting financial targets and individual objectives, and when reviewing
performance against them, the Remuneration Committee takes into account the long-term impact and any risks that could be associated with those targets and objectives. 
As part of a balanced scorecard approach, the Remuneration Committee may use its discretion to reduce payments to take account of significant
safety or service standard incidents, environmental, social and governance issues when determining payments to Executive Directors. Those principles may then be cascaded down the organisation to appropriate employee groups based on the specific
circumstances.Changes in the year

None.Page

Details of performance under the APP for
2012/13 can be found in the Implementation report on page 81.








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Long Term Performance Plan (LTPP)Purpose and link to strategy

The LTPP is designed to drive medium- to
long-term performance, aligning key strategic objectives to shareholder interests. This plan replaced the Performance Share Plan (PSP).Operation

Executive Directors and approximately 400
other senior employees who have significant influence over the Companys ability to meet its strategic objectives may receive an award which vests subject to the achievement of performance conditions set by the Remuneration Committee at
the date of grant.Shares vest (over three or four years
depending on the performance measure) conditional upon the satisfaction of the relevant performance criteria. TSR and EPS targets are measured over a three year performance period and ROE is measured over four years which more readily reflects the
nature of that metric.This will result in partial vesting after
three years, subject to performance, and the remainder relating purely to ROE after four years.25% of the shares awarded subject to each
measure vest for threshold performance.For performance between threshold and the
upper target, the number of shares released is pro rated on a straight-line basis.In order to align better the interests of
participants with those of shareholders, the rules of the LTPP allow the Remuneration Committee to determine that dividends accrue on the shares comprised in the award. The dividends are released in shares when the award vests, if and to
the extent the performance criteria are achieved.See further details in the notes to this
table below, including information on the PSP and the common policy elements of both plans.Opportunity

The value of shares (ADSs for US-based
Executive Directors and relevant employees) constituting an award (as a percentage of salary) varies by grade and seniority.The maximum award level for Executive
Directors is 200% of salary (225% of salary for the Chief Executive, to further emphasise longer term performance related pay in his package).The provisions in the LTPP rules allow
awards up to a maximum value of 250% of salary to provide a degree of flexibility for the future.Performance
metrics

The same performance measures are
cascaded to all participants in the LTPP.The performance measures are defined on
page 72 and are calculated by reference to:  the annualised growth of the Companys adjusted EPS (50% of the
award);  the Companys TSR performance when compared with the FTSE 100 at the date of grant
(25% of the award); and  ROE, measuring performance against allowed regulatory returns established through price
control reviews in the UK and rate case settlements in the US (25% of the award).It is believed the level of challenge for
the ROE performance ranges in the UK and US are broadly similar, to provide stretch in both cases while at the same time being motivational for participants. The performance ranges reflect the different impacts of regulated incentives in the UK and
US.Changes in the year

None.Page

Details of the awards vested and granted
during 2012/13 can be found in the Implementation report on pages 82, 88 and 89.


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Corporate Governance

Remuneration Report

Pay
policy report 2012/13

Continued



Additional notes to the LTPP and PSP LTPP Details regarding
the LTPP performance measures and vesting requirements are provided in the table below:  Performance measure



Definitions and measurement

Vesting requirementsEPS



The EPS measure is calculated by reference to annualised growth in adjusted EPS (on a
continuing basis and excluding exceptional items, remeasurements and stranded costs) over a three year performance period. See page 48 for further details.

Threshold performance  25% of the shares subject to this measure will vest where EPS growth exceeds
RPI growth by 3 percentage points.  
Upper target performance  100% of the shares subject to this measure will vest where EPS growth exceeds RPI growth by 8 percentage
points.TSR



In calculating TSR (on an annualised compound basis) it is assumed that all dividends are reinvested. No
shares will be released under the TSR part of the award if the Companys TSR over the three year performance period, when ranked against that of the FTSE 100 comparator group, falls below the median.

Threshold performance  25% of the shares subject to this measure will vest for TSR at
median.  
Upper target performance  100% of the shares subject to this measure will vest where National Grids TSR performance is 7.5 percentage
points above that of the median company in the FTSE 100.ROE



The ROE measure is derived from the returns on page 07. In the UK, this is based on the UK Transmission
and UK Gas Distribution ROEs. For the US, it is based on US regulated returns by jurisdiction. There is a four year performance period. The Chief Executive and Finance Director are targeted on both the UK and US ROEs. For the UK- and
US-based operational Directors, they are targeted on their respective UK or US ROEs.

Threshold performance  25% of the shares subject to this measure will vest where the allowed
regulatory returns in the UK are achieved and 1 percentage point below the allowed regulatory returns in the US. 
 Upper target performance  100% of the shares subject
to this measure will vest for out-performance of regulatory returns by 2 percentage points in the UK and 1 percentage point in the US. PSP (the predecessor to the LTPP) operated for awards between 2003 and 2010 inclusive 

The general operation of the PSP is similar to that detailed above under the LTPP, as is the population who participate in the plan. 

The value of shares (ADSs for US-based Executive Directors and relevant employees) constituting an award (as a percentage of salary) varied by grade and seniority subject to a maximum, for all
Executive Directors, of 200% of salary. The provisions in the PSP rules allowed awards up to a maximum value of 250% of salary, although no awards were made above 200%. 

Shares vest after three years, conditional upon the satisfaction of the relevant performance criteria. Vested shares must then be held for a further period (the retention period) after which they
are released to the participant on the fourth anniversary of the date of grant. During the retention period, the Remuneration Committee has discretion to pay an amount, in cash or shares, equivalent to the dividend which would have been paid on the
vested shares. 

Awards vest based on the Companys TSR performance when compared with the FTSE 100 at the date of grant (50% of the award) and the annualised growth of the Companys EPS (50% of the
award). The same performance criteria are cascaded to all participants in the plan. Details regarding the PSP
performance measures and vesting requirements are provided in the table below:  Performance measure



Definitions and measurement

Vesting requirementsEPS



The EPS measure is calculated by reference to annualised growth in adjusted EPS (on a continuing basis
and excluding exceptional items, remeasurements and stranded costs) over a three year performance period. See page 48 for further details.

Threshold performance  30% of the shares subject to this measure will vest where EPS growth exceeds
RPI growth by 3 percentage points.  Upper target
performance  100% of the shares subject to this measure will vest where EPS growth exceeds RPI growth by 8 percentage points.TSR



In calculating TSR (on an annualised compound basis) it is assumed that all dividends are reinvested. No
shares will be released under the TSR part of the award if the Companys TSR over the three year performance period, when ranked against that of the FTSE 100 comparator group, falls below the median.

Threshold performance  30% of the shares subject to this measure will vest for TSR at
median.  
Upper target performance  100% of the shares subject to this measure will vest where National Grids TSR performance is 7.5 percentage
points above that of the median company in the FTSE 100.









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Common policy elements of the LTPP and PSP 

The Remuneration Committee believes the measures offer a balance between meeting the needs of shareholders (by measuring TSR performance against other large UK companies) and providing a measure of
performance (EPS growth and including ROE for the LTPP) over which the Executive Directors have direct influence. All these measures are key financial performance indicators for the Company, our shareholders and/or our regulators. 

No re-testing of performance is permitted for the awards that do not vest after the performance periods and any such awards lapse. 

If the Remuneration Committee considers, in its absolute discretion, the underlying financial performance of the Company does not justify the vesting of awards, even if some or all the performance
measures are satisfied in whole or in part, it can declare that some or all the award lapses. 

In addition, the Remuneration Committee retains the right, in exceptional circumstances, to reclaim any monies based on financial misstatement and/or the misconduct of an individual through means
deemed appropriate to those specific circumstances. 

Under the terms of the LTPP and PSP, the Remuneration Committee may allow shares to vest early to departing participants, including Executive Directors, to the extent the performance conditions
have been met, in which event the number of shares that vest will be pro rated to reflect the proportion of the performance period that has elapsed at the date of departure.  BenefitsPurpose and link to strategy

To attract, motivate and retain high calibre Executive Directors and other senior employees to deliver value for shareholders
and high levels of customer service, safety and reliability in an efficient and responsible manner.Operation

The Company provides competitive benefits to Executive
Directors. Business expenses incurred are reimbursed in such a way as to give rise to no benefit to the Executive Director.Flexible benefits planAdditional benefits may be purchased under the flexible benefits plan in which UK-based Executive Directors, along with all other UK employees, have been given the
opportunity to participate. The plan operates by way of salary sacrifice, that is, the participants salaries are reduced by the monetary value used to purchase benefits under the plan.Similar plans are offered to US-based employees. However,
they are not salary sacrifice plans and therefore do not affect salary values. Tom King was a participant in such a plan during the year.Opportunity

Benefits include a fully expensed car or a cash alternative
in lieu of a car, use of a driver when required, private medical insurance and life assurance.Many of the flexible benefits are linked to purchasing
additional healthcare and insurance products for employees and their families. Andrew Bonfield participates in this plan and the impact on his salary is shown in Table 1A on page 86.Performance metrics

None.Changes in the year

None.Page

See page 86.


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Corporate Governance

Remuneration Report

Pay
policy report 2012/13

Continued



All-employee Share PlansPurpose and link to strategy

The all-employee share plans allow UK or US-based employees to participate in either HM Revenue &
Customs (UK) or Internal Revenue Service (US) approved plans. We believe by offering participation in such plans, it encourages all employees (including Executive Directors) to become shareholders in National Grid.Operation

Sharesave:Employees resident in the UK are eligible to participate in the Sharesave plan. Under this plan, participants may contribute between £5 and
£250 in total each month, for a fixed period of three years, five years or both. Contributions are taken from net salary.SIP:Employees resident in the UK are eligible to participate in the SIP. Contributions up to £125 are deducted from participants gross
salary and used to purchase ordinary shares in National Grid each month. The shares are placed in trust.US Incentive Thrift
Plans:Employees of National Grids US companies are eligible to participate in the Thrift Plans, which are tax-advantaged savings plans (commonly
referred to as 401(k) plans). They are defined contribution pension plans that give participants the opportunity to invest up to applicable federal salary limits. The federal limits for calendar year 2012 are: for pre-tax contributions a
maximum of 50% of salary limited to $17,000 for those under the age of 50 and $22,500 for those over 50; for post-tax contributions, up to 15% of salary limited to the lesser of 100% of compensation or $50,000. For calendar year 2013, participants
may invest up to the applicable federal salary limits ie for pre-tax contributions a maximum of 50% of salary limited to $17,500 for those under the age of 50 and $23,000 for those over 50; for post-tax contributions up to 15% of salary limited
to the lesser of 100% of compensation or $51,000.ESPP:Employees of National Grids US companies are eligible to participate in the ESPP (commonly referred
to as a 423(b) plan). Eligible employees have the opportunity to purchase ADSs on a monthly basis at a 15% discounted price. Under the plan employees may contribute up to 20% of base pay each year up to a maximum annual contribution of
$18,888 to purchase ADSs in National Grid.Opportunity

Sharesave:At the end of the savings period, contributions can be used to purchase ordinary shares in National Grid at
a discount capped at 20% of the market price set at the launch of each savings period. 
SIP: If the shares are
left in trust for at least five years, they can be removed free of UK income tax and National Insurance Contributions. 
US Incentive Thrift Plans:
Employees may invest their own and Company contributions in National Grid shares or various mutual fund options. The Company matches 50% of the
first 8% of salary contributed.  ESPP:
Any ADSs purchased through the ESPP may be sold at any time, however, there are tax advantages for ADSs held for at least two years from the offer
date.Performance metrics

None for any of the all-employee share plans.Changes in the year

None for any of the all-employee share plans.Page

See pages 87 and 90 for details of participation by the Executive Directors.









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Share Ownership GuidelinesPurpose and link to strategy

The Remuneration Committee believes the
requirement to build up and maintain shareholding ensures that Executive Directors share a significant level of risk with the Companys shareholders and their interests are aligned.Operation

The Chief Executive is required to build
up and retain a shareholding representing at least 200% of annual salary. For other Executive Directors the requirement is 125% of salary. This will be achieved by retaining at least 50% of the after-tax gain on any options exercised or shares
received through the long-term incentive or all-employee share plans and will include any shares held beneficially. 
In addition, senior managers in the Company are encouraged to build up and retain a shareholding representing at least 100% of annual
salary.Opportunity

N/A.Performance metrics


None.Changes in the year

None.Page

See the shareholding table on page
82.


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Corporate Governance

Remuneration Report

Pay policy report 2012/13

Continued



PensionPurpose and link to strategy

To reward sustained contribution, and
assist attraction and retention. The National Grid Electricity Group of the Electricity Supply Pension Scheme (NGEG of ESPS) is a defined benefit scheme which provides legacy benefits which were available to all employees at the time Steve Holliday
and Nick Winser joined the Company. The scheme along with the National Grid UK Pension Scheme  defined benefit section (NGUKPS-DB) is now closed to new members and new employees are offered membership of the NGUKPS defined contribution section
(NGUKPS-DC).Operation

Steve Holliday and Nick Winser are
provided with final salary pension benefits. Within the NGEG of ESPS the pensionable salary is normally the base salary in the 12 months prior to leaving the Company, however, the rules allow for indexed prior salaries to be used. Both Executive
Directors participate in Flexible Pension Savings (FPS), a salary sacrifice arrangement available to all members of the Companys UK pension schemes.Steve Holliday and Nick Winser have
elected to participate in the unfunded scheme in respect of any benefits in excess of the Lifetime Allowance or their Personal Lifetime Allowance. An appropriate provision in respect of the unfunded scheme has been made in the Companys balance
sheet. Alternatively, these Executive Directors are able to cease accrual in the pension schemes and take a 30% cash allowance in lieu of pension if they so wish. This option is offered to current senior employees in the Company, except the cash
allowance varies depending upon organisational grade.Andrew Bonfield is a member of the
NGUKPS-DC. He has chosen to participate in FPS.The benefits offered to Andrew Bonfield
are in line with those offered to current senior employees in the Company, except the total value of the Company contribution and cash allowance varies depending upon organisational grade.Following the changes to pensions tax
relief introduced from April 2011, the Company reviewed the pension benefits offered to members. The Company agreed that senior employees most likely to be affected by the legislative changes will be offered more flexibility to take cash in lieu of
Company contributions. The total level of benefits offered in the form of cash and/or pension contributions will not change. The Company continues to honour existing unfunded promises, however, no new unfunded promises have been granted since April
2006.Tom King participates in a qualified
pension plan and an executive supplemental retirement plan provided by National Grids US companies. These plans are non-contributory defined benefit arrangements. The qualified plan is directly funded, while the executive supplemental
retirement plan is indirectly funded through a rabbi trust.US benefits are calculated using a
formula based on years of service and highest average compensation over five consecutive years. In line with many US plans, the calculation of benefits under the arrangements takes into account salary, APP awards and incentive share awards (DSP),
but not share options or LTPP/PSP awards.Opportunity

For UK-based Executive Directors, the
final salary pension schemes are designed to provide a pension of one thirtieth of final salary at age 60 for each year of service subject to a maximum of two thirds of final salary, including any pension rights earned in previous employment.
Life assurance provision of four times pensionable salary and a spouses pension equal to two thirds of the Executive Directors pension are provided on death.Under the DC arrangement, if the
Executive Director chooses to pay the maximum standard contribution of 5% of salary, the Company will typically pay a pension contribution of 30%. Alternatively, the Company will pay a non-pensionable cash allowance to ensure the total value of the
Company contribution (not including contributions paid via FPS) and the cash allowance is equal to 30% of base salary. The latter option was chosen by Andrew Bonfield. Life assurance provision of four times pensionable salary and a spouses
pension equal to one third of the Executive Directors base salary are provided on death.The normal retirement age for the
US-based Executive Director under the qualified pension plan is 65. The executive supplemental retirement plan provides unreduced pension benefits from age 55. On the death of the Executive Director, the plans also provide for a spouses
pension of at least 50% of that accrued by the Executive Director. Benefits under these arrangements do not increase once in payment.Performance metrics


None.Changes in the year

None.Page

See pages 83 and 87.








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Performance elements in the Executive Directors remuneration package Illustrated below is the current remuneration package for the Chief Executive and other Executive Directors (excluding pensions,
all-employee share plans and non-cash benefits) for assuming on target performance and maximum stretch performance for the incentive plans (APP and LTPP). The assumptions for at threshold are based on 6.66% of maximum (10% of salary) for the APP and 25% of maximum (50% of salary) for LTPP
awards. For the Chief Executive, due to the higher LTPP award level, the at threshold assumption is 56.25% of salary. The
assumptions used for target performance are based on 40% of maximum (60% of salary) for the APP and 50% of maximum (100% of salary) for LTPP awards. For the Chief Executive, due to the higher LTPP award level, the target assumption is 112.5% of
salary.  Executive Directors remuneration package (key
elements expressed as a percentage of the package)  LOGO


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Corporate Governance

Remuneration Report

Pay policy report 2012/13

Continued



Executive Directors service contracts, external appointments and retention of fees policy, termination and mitigationPurpose and link to strategy

In its consideration of these matters the
Remuneration Committee takes into account the Companies Act 2006, the UK Listing Authoritys Listing Rules, the UK Corporate Governance Code and other requirements of legislation, regulation and good governance.Operation

Service contracts for all Executive
Directors provide for one years notice by either party, which aligns to best practice. Participation in our incentive and pension plans is governed by the policy for those plans (as detailed in the policy tables on pages 70 to 76) and the
respective plan rules. Participation in incentive plans is totally at the discretion of the Remuneration Committee and is not a contractual right.With respect to external appointments,
with the approval of the Board, Executive Directors may normally accept one external appointment as a non-executive director of another company and retain any fees received for the appointment.Opportunity

In the event of early termination by the
Company of an Executive Directors employment, contractual base salary only reflecting the notice period would normally be payable.The Remuneration Committee operates a
policy of mitigation in these circumstances with any payments being made on a monthly basis. The departing Executive Director would generally be expected to mitigate any losses where employment is taken up during the notice period, however, this
policy remains subject to the Remuneration Committees discretion, based on the circumstances of the termination.On cessation of employment, outstanding
awards under the share plans will be treated in accordance with the relevant plan rules approved by shareholders. Generally, good leaver provisions apply for retirement, redundancy, disability and ill health purposes where awards will be
released to the departing Executive Director. For PSP and LTPP, awards are released subject to performance at the time of leaving and time pro ration based on the number of completed months that have elapsed during the performance period, from
the date of award to the termination date.In the case of resignation, shares
generally lapse under the share incentive plans, including those awarded under the DSP.At the absolute discretion of the
Remuneration Committee, a departing Executive Director may receive a pro rated APP payment based on the number of months that have elapsed during the performance period at the time of leaving. Any such payment is subject to performance achieved
against the financial measures and individual performance objectives for that year.Performance metrics


None other than those detailed
immediately above.Changes in the year

None.Page

For service contract dates, please see
the table immediately below. In addition, details of those Executive Directors who served as non-executive directors in other companies during the year ended 31 March 2013 can be found in the Implementation report on page 84.    Executive Directors

Date of contract

Notice periodSteve Holliday

1 April 2006


12 monthsAndrew Bonfield

1 November 2010


12 monthsNick Winser

28 April 2003


12 monthsTom King

11 July 2007


12 months








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Non-executive Directors fees and letters of appointmentPurpose and link to strategy



To remunerate Non-executive Directors, as
Board members, to deliver value for shareholders and high levels of customer service, safety and reliability in an efficient and responsible manner.Operation



Non-executive Directors
remuneration comprises a basic fee, a Committee membership fee per membership and for those who are chairmen of committees, an additional fee.Non-executive Directors do not
participate in the APP or LTPP, nor do they receive any pension benefits from the Company.The Chairman is covered by the
Companys personal accident and private medical insurance schemes. In addition, he may have a fully expensed car or cash in lieu of a car (with the use of a driver when required).The Chairmans letter of appointment
provides for a period of six months notice by either party to give the Company reasonable security with regard to his service. The terms of engagement of Non-executive Directors other than the Chairman are also set out in letters of
appointment. For all Non-executive Directors, including the Chairman, their initial appointment and any subsequent reappointment is subject to election by shareholders. The letters of appointment do not contain provision for termination
payments.Opportunity



The Chairman receives a single fee for
undertaking all his duties.For Non-executive Directors the fees
include: a basic fee; committee membership fees; a fee for those who chair a committee and a fee for the role of the Senior Independent Director.Performance metrics



None.Changes in the year



None.Page



For dates of appointment to the Board and
dates of next election, please see the table immediately below.  Non-executive Directors

Date of appointment to the Board



Date of next electionSir Peter Gershon

1 August 2011




2013 AGMKen Harvey (i)

21 October 2002




Philip Aiken

15 May 2008




2013 AGMNora Mead Brownell

1 June 2012




2013 AGMJonathan Dawson

4 March 2013




2013 AGMPaul Golby

1 February 2012




2013 AGMRuth Kelly

1 October 2011




2013 AGMMaria Richter

1 October 2003




2013 AGMGeorge Rose (i)

21 October 2002




Mark Williamson

3 September 2012




2013 AGMLinda Adamany (ii)

1 November 2006




Stephen Pettit (iii)

21 October 2002




  (i)
Ken Harvey and George Rose will step down from the Board at the close of the 2013 AGM. (ii)
Linda Adamany stepped down from the Board on 31 October 2012. (iii)
Stephen Pettit stepped down from the Board on 30 July 2012.


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Corporate Governance

Remuneration Report

Implementation report 2012/13



Review of the year During the
year, the following regular agenda items have been discussed:  

review and approval of salary increases for Executive Directors and direct reports to the Chief Executive including the salary budget for all non unionised employees in the Company; 

approval of the Remuneration Report and analysis of associated AGM voting levels; 

review of achievement for financial measures and individual objectives under the outgoing years APP; 

approval of the forthcoming years APP financial measures and individual objectives; 

review and approval of awards made under the LTPP; 

review of all share plan performance measures including the annual vesting of the PSP awards; 

review of Executive Director and senior management shareholding guidelines including achievement against them; 

review of risk matters in incentive plans; 

review of dilution levels; and 

review of the code of conduct for the independent remuneration advisors to the Remuneration Committee. Annual review and strategy meeting (to ensure remuneration practices are reviewed and align to Company strategy)  

consideration of current guidelines by advisory bodies and institutional investors regarding executive remuneration, including a detailed review of the draft BIS regulations; 

review of the Remuneration Report disclosures and voluntary early adoption of some of the key areas under the draft BIS regulations; 

review of external market data for all areas of remuneration including performance measures used in incentive plans and plan design; and 

discussion regarding performance measures for the APP and LTPP under RIIO. Additional items during
the year  

pension/retirement plan strategy discussion; and 

consideration of responses for BIS consultations. The Board has accepted all the recommendations
made by the Remuneration Committee during the year. The Remuneration Committee has authority to obtain the advice of external
independent remuneration consultants. It is solely responsible for their appointment, retention and termination together with approval of the basis of their fees and other terms. Remuneration Committee advisors are chosen following a robust tender
process. In the year to 31 March 2013, the following advisors provided services to the Remuneration Committee:  

Towers Watson, independent remuneration advisors. Separate teams in the firm provide general remuneration, pension and benefits advice to the Company. In this respect, the Remuneration Committee is satisfied that any
potential conflicts are appropriately managed. Towers Watson is a member of the Remuneration Consultants Group and the Remuneration Committee has carefully reviewed their voluntary code of conduct in relation to executive consulting in the UK; 

Alithos Limited, provision of TSR calculations for the PSP and LTPP; 

Linklaters LLP, advice relating to Directors service contracts as well as providing other legal advice to the Company; and 

KPMG LLP, advice relating to pension taxation legislation. Salary June 2012 Salary increases for
Executive Directors during the reporting year (ie effective from 1 June 2012) were on average 2.74% and were reported in the previous years Remuneration Report. Those increases were consistent with a salary increase budget of 3% for
employees generally across the business, UK and US. June 2013 The Company is at the beginning of a number of important regulatory arrangements in both the UK and US, in particular the new RIIO framework. In
recognition of the significant changes being implemented across the business, the Executive Directors will not receive salary increases in June 2013. The next review will, therefore, be in June 2014.









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APP performance for 2012/13 The following table details the financial targets for 2012/13 and performance achieved against them as well as examples of performance against individual objectives:  Steve Holliday &Andrew Bonfield

Nick Winser

Tom KingFinancial measures for 2012/13

Adjusted EPS

Adjusted EPS

Adjusted EPS¿

Between target and stretch

Performance achieved

¿

¿

¿¿ 
¿

Between threshold and target 
Below threshold



Consolidatedcash flow

Consolidatedcash flow

Consolidatedcash flowPerformance achieved

¿

¿

¿UK ROE

UK adjustedoperating profit

US operatingprofit
(US GAAP basis)Performance achieved

¿

¿

¿US ROE

UK ROE

US cash flowPerformance achieved

¿

¿

¿N/A

N/A

US ROEPerformance achieved

N/A

N/AExamples of performance
against individual objectives for 2012/13

Steve Holliday has spearheaded an increased focus on safety (eg to reduce our lost time injury frequency rate
and the Take Care campaign, see page 36 for more details) and the development and articulation of our new dividend policy. In addition, Steve has been instrumental in setting the strategy and direction for our submissions to RIIO and our US rate
case negotiations. Steve continues to be influential in a number of important areas that have an impact on both the Company and the UK economy generally including the engineering skills gap, building a long-term energy infrastructure, and the
improvement of youth employment through promoting apprenticeships, tackling the numeracy challenge and providing more meaningful work experience placements.Andrew Bonfield has developed a long-term financing strategy to enable the Company to fund its capital
expenditure programme which included the issue of hybrid bonds at attractive interest rates. In addition, Andrew has introduced new business planning and budget processes, and has designed new performance metrics aligned to RIIO and other key
initiatives which will be used for internal management reporting from 2013/14. Andrew has continued to focus on ensuring the Company continues to communicate effectively with the debt and equity markets.Nick Winser has led the Companys response to the UK regulatory process to ensure a sustainable outcome
for all parties, and the development of the draft Electricity Market Reform (EMR) Bill, working closely with Government Ministers and other stakeholders. In addition, Nick has been focused on the implementation of the UK operating model change
programme, which along with organisational structure changes, has included culture change initiatives, education and training to equip the UK business for the introduction of RIIO.Tom King has delivered the next phase of an end-to-end operational process enhancement programme, which has focused on a number of processes
including meter to cash and emergency response this year. Tom also led the Companys response to the severe storms affecting our service territories during the period, working closely with the communities affected and the regulators in those
jurisdictions. In addition, Tom has led the US business through multiple regulatory filings, resulting in sustainable outcomes for all three major rate case negotiations during 2012/13.While
assessing performance against individual objectives, the Remuneration Committee takes into account broader business performance, which this year included the issues surrounding the implementation of our enterprise resource planning system in the US,
see page 38 for further details.


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Corporate Governance

Remuneration Report

Implementation report 2012/13

Continued



2012/13 APP awards as a
percentage of salary  Executive
Directors

%Steve Holliday


85Andrew Bonfield


96Nick Winser


92Tom King


72 Vested 2009 PSP award The upper target for the EPS performance criteria was met partially (50.3% of the shares subject to that performance measure vested) but threshold performance against the TSR element of the award was not achieved resulting in shares
subject to that measure lapsing. This resulted in vesting at 25.15% of the award. The shares then entered the retention period. The Remuneration Committee agreed to pay a cash amount equivalent in value to the net dividends (after taxes, commissions
and any other charges) that would be paid during the retention period in respect of the shares comprised in the vested award. These payments were made in August 2012 and February 2013, to align broadly with dividend payments to our shareholders (see
Table 4 on page 89, footnote (ii)). Vesting history of the PSP The following table details the vesting of the PSP over the years it has been in operation, shown as a percentage of the award.  2003 award
(vested 2006)


2004 award(vested 2007)


2005 award(vested 2008)


2006 award(vested 2009)


2007 award(vested 2010)


2008 award(vested 2011)


2009 award(vested 2012)


Vesting average0%



0%



100%



100%



65.15%



49.5%



25.15%



48.54% Note: All awards subject to a retention period before release. Shareholding for Executive Directors Each of the Executive Directors has surpassed the respective share ownership guideline (except for Andrew Bonfield who is more recently appointed).  Executive Directors

Ordinaryshares at31 March 2013


% of
salaryheld in ordinaryshares (i)(ii)


Sharesin Trust at31 March2013 (iii)(iv)


% ofsalary heldin shares inTrust (i)(ii)


Total
ordinary sharesand sharesin Trust at31 March2013 (iii)(iv)


% ofsalary held inordinary sharesand shares inTrust (i)(ii)


Shares subjectto performanceconditions (v)


% of salary forshares subjectto performanceconditions (i)(ii)Steve Holliday


630,476



484



439,792



338



1,070,268



822



1,083,070



832Andrew Bonfield


505



0.54



84,334



91



84,839



92



679,022



733Nick Winser


295,775



417



201,579



284



497,354



701



534,754



753Tom King
(vi)


274,010



285



288,640



301



562,650



586



739,575



771  (i)
The salary used for calculating the value of shareholding is the salary earned in the year (see Table 1A on page 86). (ii)
The share price used for calculating the value of shareholding is 765p, which was the closing share price on 28 March 2013 (the last trading day in March 2013). (iii)
Shares held in Trust include vested but unexercised options for the Share Matching Plan (where applicable, see Table 3 on page 87), shares awarded under the DSP and vested shares under the PSP (see Table 4 on pages 88
and 89). Unvested shares in the PSP and LTPP, and unexercised options held under Sharesave are not included. (iv)
Shares in Trust are shown on a gross basis, ie before deductions for income tax and other withholdings. (v)
Shares subject to performance conditions which may or may not vest. These shares have not been included in the earlier columns. (vi)
Shares converted from ADSs where each ADS represents five ordinary shares. Share dilution through
the operation of share-based incentive plans Where shares may be issued or treasury shares reissued to satisfy incentives, the
aggregate dilution resulting from executive share-based incentives will not exceed 5% in any 10 year period. Dilution resulting from all incentives, including all-employee incentives, will not exceed 10% in any 10 year period. The Remuneration
Committee reviews dilution against these limits regularly and under these limits the Company currently has headroom of 4.07% and 7.75% respectively.









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##### Table of Contents

Single figure calculation based on the draft BIS regulations. For further details, please see pages 86 to 892012/13
(£000s) (i)Steve HollidayBase Pay


996APP


846
(ii)Benefits in Kind (cash and non-cash)


312009 PSP vesting value including cash payments in lieu of
dividends


714
(iii)Pension


812
(iv)Total


3,399Andrew BonfieldBase Pay


709APP


677
(ii)Benefits in Kind (cash and non-cash)


542009 PSP vesting value including cash payments in lieu of
dividends


Pension


213
(v)Total


1,653Nick WinserBase Pay


543APP


500
(ii)Benefits in Kind (cash and non-cash)


112009 PSP vesting value including cash payments in lieu of
dividends


357
(iii)Pension


336
(iv)Total


1,747Tom KingBase Pay


734APP


526
(ii)Benefits in Kind (cash and non-cash)


242009 PSP vesting value including cash payments in lieu of
dividends


494
(iii)Pension


980
(vi)Total


2,758  (i)
For Tom King the exchange rate averaged over the year 1 April 2012 to 31 March 2013 to convert dollars to UK pounds sterling is $1.57:£1. (ii)
The APP value reflects the full award before the deferral into shares on a compulsory basis. (iii)
During the year, the 2009 PSP award vested and entered a retention period, to be released in June 2013. The value shown uses the closing share price on the date of vesting (2 July 2012) ie 681p. (iv)
The pension value represents the additional benefit earned in the year (excluding inflation as measured by the consumer price index (CPI)) multiplied by a factor of 20. (v)
Andrew Bonfield is a member of the DC section of NGUKPS. The pension value represents 30% of salary via a combination of a cash allowance in lieu of pension contributions (£184,385) and Company pension
contributions (£28,367). (vi)
The pension value represents the additional benefit earned in the year (excluding inflation) multiplied by a factor of 20.


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##### Table of Contents





Corporate Governance

Remuneration Report

Implementation report 2012/13

Continued



External appointments and retention of fees In line with our policy, the table below details the Executive Directors who served as non-executive directors in other companies during the year
ended 31 March 2013.  Executive
Directors

Company

Retained fees (£)Steve Holliday

Marks and Spencer Group plc


85,000Andrew Bonfield

Kingfisher plc


80,000Nick Winser

Kier Group plc


44,000 Chief Executives total remuneration for the period 2008/09 to 2012/13 The following table provides details of the Chief Executives total remuneration for the period 2008/09 to 2012/13, using the same
methodology as that used for the single figure calculation.  2008/09


2009/10


2010/11


2011/12


2012/13Chief Executives total remuneration (£000s)
(i)


3,624



3,982



3,805



3,604



3,399APP awards as a percentage of maximum potential (%)


92



95.33



81.33



68.67



56.65PSP awards vested as a percentage
of maximum potential (%)


100



100



65.15



49.5



25.15  (i)
The values are based on the methodology used for the single figure calculation (see page 83 for further details) and therefore include salary, APP, Benefits in Kind, vested PSP awards and pension
benefits earned each year. Total shareholder return performance graph The graph below represents the comparative TSR performance of the Company from 31 March 2008 to 31 March 2013. This graph represents the Companys performance against the performance of the FTSE 100 index, which is considered suitable for this purpose
as it is a broad equity market index of which National Grid is a constituent. This graph has been produced in accordance with the requirements of Schedule 8 of the Large and Medium-sized Companies and Groups (Accounts and Reports) Regulations 2008. In drawing this graph, it has been assumed that all dividends have been reinvested. The TSR level shown at 31 March each year is
the average of the closing daily TSR levels for the 30 day period up to and including that date.  LOGO









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Relative importance of spend on pay The following table sets out the amount of Executive Directors total remuneration (using the single figure methodology used on page 83) in 2012/13, compared with other key metrics.  Key
metric

£mMarket capitalisation as at 31 March 2013


28,040Dividends (interim and final for year ended 31 March
2013)


1,494Revenue


14,359Adjusted operating profit


3,644Cash flow generated from operations


4,037Capital investment (including joint ventures)


3,700Executive Directors total
remuneration


10 Non-executive Directors fees In 2012/13 the basic fee for UK-based, Non-executive Directors was £60,000 pa and for those who are US-based, £72,000 pa. The
committee membership fee was £8,000 pa per membership and for those who are chairman of a committee, an additional fee of £12,500 pa was paid. The Audit Committee chairman received a fee of £15,000 pa to recognise the additional
responsibilities commensurate with that role and the Senior Independent Director received a fee of £20,000 pa.


LOGO






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##### Table of Contents





Corporate Governance

Remuneration Report

Implementation report 2012/13

Continued



Remuneration during the year ended 31 March 2013 Sections 1, 2, 3, 4 and 6 comprise the auditable part of the Remuneration Report, being the information required by Schedule 8 of the
Large and Medium-sized Companies and Groups (Accounts and Reports) Regulations 2008. 1. Directors emoluments The following tables set out the pre-tax emoluments for the years ended 31 March 2013 and 2012, including APP awards but excluding pensions,
for individual Directors who held office in National Grid during the year ended 31 March 2013.  Table 1A




Year ended 31 March 2013





Year ended 31 March 2012Executive Directors

Salary (i)£000s


APP£000s


Benefitsin Kind (ii)(cash)£000s


Benefitsin Kind (ii)(non-cash)£000s


Total£000s


Total £000sSteve Holliday


996



846



12



19



1,873



2,001Andrew Bonfield (iii)


709



677



234



5



1,625



1,653Nick Winser


543



500







11



1,054



1,057Tom King (iv)


734



526



5



19



1,284



1,449Total


2,982



2,549



251



54



5,836



6,160  (i)
For the reasons provided on page 80, the Executive Directors will not receive salary increases in June 2013, the next review will be in June 2014. As reported in last years Remuneration
Report, salaries effective from 1 June 2012 were: Steve Holliday £1,000,000; Andrew Bonfield £712,000; Nick Winser £546,000; and Tom King £724,203. (ii)
Benefits in Kind comprise benefits such as private medical insurance, life assurance, either a fully expensed car or cash in lieu of a car and the use of a driver when required. In the case of
Andrew Bonfield, a cash allowance in lieu of additional Company pension contributions is included (see Table 2 on page 87 for further details). (iii)
Andrew Bonfield participates in FPS which operates by way of salary sacrifice, therefore, his salary is reduced by the value of the benefits he has elected under the Plan. The value of these
benefits is included in the Benefits in Kind (non-cash) figure. The value is £442. (iv)
For Tom King the exchange rate averaged over the year 1 April 2012 to 31 March 2013 to convert dollars to UK pounds sterling is $1.57: £1.  Table 1B

Year ended 31 March 2013


Year ended 31 March 2012Non-executive Directors

Fees
£000s


Other
emoluments £000s


Total
£000s


Total
£000sSir Peter Gershon (i)


475



17



492



228Ken Harvey (ii)


108







108



104Philip Aiken


84







84



76Nora Mead Brownell (iii)


73







73



Jonathan Dawson (iv)


6







6



Paul Golby (v)


76







76



13Ruth Kelly (v)


76







76



38Maria Richter


101







101



101George Rose (ii)


91







91



91Mark Williamson (vi)


44







44



Linda Adamany (vii)


51







51



88Stephen Pettit (viii)


32







32



97Total


1,217



17



1,234



836  (i)
Sir Peter Gershons other emoluments comprise medical insurance, cash in lieu of a car and the use of a driver when required. The figure shown for the year ended 31 March 2012 represents
a partial year. Sir Peter Gershon joined the Board on 1 August 2011 as Deputy Chairman and became Chairman on 1 January 2012. (ii)
Ken Harvey and George Rose will step down from the Board at the close of the 2013 AGM. (iii)
Nora Mead Brownell joined the Board on 1 June 2012. (iv)
Jonathan Dawson joined the Board on 4 March 2013. (v)
The figures shown for the year ended 31 March 2012 represent partial years. Paul Golby joined the Board on 1 February 2012 and Ruth Kelly on 1 October 2011. (vi)
Mark Williamson joined the Board on 3 September 2012. (vii)
Linda Adamany stepped down from the Board on 31 October 2012. (viii)
Stephen Pettit stepped down from the Board on 30 July 2012.









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##### Table of Contents

2. Directors pensions The
table below provides details of the Executive Directors pension benefits.  Additionalbenefit earnedduringyear ended31 March2013 pension£000s


Accruedentitlement
as at
31 March 2013pension£000s


Transfer value of accrued     benefits as at 31 March (i)


Increase in transfer
value less Directors contributions (ii)£000s


Additional benefit earned in the
year ended 31 March 2013 (excluding inflation)pension £000s


Transfer value of
increase in accrued benefit in the year ended 31 March 2013 (excluding inflation) and Directors contributions (ii)£000sTable 2



2013
£000s


2012
£000sSteve Holliday (iii) (iv)


50



474



12,330



10,675



1,655



39



1,003Andrew Bonfield (v)


























Nick Winser (iv) (vi)


22



266



6,185



5,685



500



16



352Tom King (vii)


49



479



3,827



2,864



963



49



392  (i)
The transfer values shown at 31 March 2012 and 2013 represent the value of each Executive Directors accrued benefits based on total service to the relevant date. Transfer values for the
UK-based Executive Directors have been calculated in line with transfer value bases agreed by the UK Pension Scheme Trustees. The transfer values for the US-based Executive Director have been calculated using discount rates based on high quality US
corporate bonds and associated yields at the relevant dates. (ii)
The UK-based Executive Directors participate in FPS, a salary sacrifice arrangement. Therefore, contributions paid via salary sacrifice have not been deducted from the figures in the table above. Information about the
contributions paid via FPS can be found in footnotes (iii), (v) and (vi) below. (iii)
In addition to the pension above, for Steve Holliday there is an accrued lump sum entitlement of £126,000 as at 31 March 2013. The increase to the accumulated lump sum including
inflation was £4,000 and excluding inflation was £1,000 in the year to 31 March 2013. The transfer value information above includes the value of the lump sum. Contributions were paid via FPS of £21,000. (iv)
The requirements for the calculation of pensionable salary in the table on page 83 are different to those for this table. Therefore, in order to achieve alignment between the tables, figures
reported in the 2011/12 Directors Remuneration Report for the transfer value of accrued benefits as at 31 March 2012 have been rebased. (v)
Andrew Bonfield does not participate in either of the Companys defined benefit pension arrangements. Andrew is a member of the DC section of the NGUKPS and the Company has made contributions
of £28,367 to this arrangement. In addition, £14,183 was paid via FPS. Andrew also received a cash allowance in lieu of additional Company contributions equal to 26% of base salary. This allowance is included in Table 1A on page 86. (vi)
In addition to the pension above, for Nick Winser there is an accrued lump sum entitlement of £306,000 as at 31 March 2013. The increase to the accumulated lump sum including inflation
was £11,000 and excluding inflation was £4,000 in the year to 31 March 2013. The transfer value information above includes the value of the lump sum. Contributions were paid via FPS of £33,000. (vii)
For Tom King, the exchange rate as at 31 March 2013 was $1.51945:£1 and as at 31 March 2012 was $1.59960:£1. In addition to the pension quoted above, through participation in
the 401(k) plan in the US, the Company made contributions worth £1,878 to a defined contribution arrangement. 3.
Directors interests in share options Executive Share Option Plan (ESOP) The table below provides details of the Executive Directors holdings of share options awarded under the Share Matching Plan (Share Match)
and Sharesave plans.  Table 3

Options heldat 1 April 2012


Optionsexercised orlapsed duringthe year


Market price at exercise (pence)


Optionsgrantedduringthe year


Options held at31 March 2013


Exercise price per share (pence)


Normal exerciseperiodSteve HollidayShare Match


16,092















16,092



100 in total



Jun 2006 to Jun 201321,383















21,383



nil



May 2007 to May 2014Sharesave


3,921















3,921



427.05



Apr 2014 to Sep 2014Total


41,396















41,396Andrew BonfieldSharesave


3,421















3,421



445



Apr 2016 to Sep 2016Total


3,421















3,421


LOGO






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##### Table of Contents





Corporate Governance

Remuneration Report

Implementation report 2012/13

Continued



4. Directors interests in the LTPP, PSP and DSP

The table below provides details of the Executive Directors holdings of shares awarded under the LTPP whereby Executive Directors receive a conditional award of shares, up to a current maximum of 200% of salary (225% of salary
for the Chief Executive), which is subject to performance criteria over a three year performance period for the annualised growth of the Companys EPS (50% of the award), see page 48 for further information, and the Companys TSR
performance (25% of the award) when compared with the FTSE 100. The final 25% of the award is subject to ROE performance over four years. See page 07 for further information.

The table includes shares awarded under the PSP whereby Executive Directors received a conditional award of shares, up to a maximum of 200% of
salary, which is subject to performance criteria over a three year performance period. Awards vest based on the Companys TSR performance when compared with the FTSE 100 at the date of grant (50% of the award) and the annualised growth of the
Companys EPS (50% of the award). Shares are then released on the fourth anniversary of the date of grant, following a retention period.

The table includes share awards under the DSP, where Executive Directors receive an award of shares representing one half of any APP award earned in the year. The deferred shares are held in Trust for three years before release.



|                |  |              |      |         |                                                  |  |           |                         |  |  |                     |        |  |                            |             |        |                          |  |            |                                        |  |  |                          |  |  |                                   |          |  |                         |  |          |         |  |  |           |  |  |  |                    | 
|--------------- |  | ------------ | ---- | ------- | ------------------------------------------------ |  | --------- | ----------------------- |  |  | ------------------- | ------ |  | -------------------------- | ----------- | ------ | ------------------------ |  | ---------- | -------------------------------------- |  |  | ------------------------ |  |  | --------------------------------- | -------- |  | ----------------------- |  | -------- | ------- |  |  | --------- |  |  |  | ------------------ | 
|Table 4         |  | Type ofaward |      |         | PSP, LTPPand DSPconditionalawards
at1 April 2012 |  |           | Awardslapsedduring year |  |  | Awardsvestedin year |        |  | Releaseof PSPawardsin year |             |        | Awardsgrantedduring year |  |            | Market price at award (pence except #) |  |  | Date of award (dd/mm/yy) |  |  | Conditionalawards at31 March 2013 |          |  | Release
date (dd/mm/yy) | 
|                | 
|Steve Holliday  |  |              |      |         |                                                  |  |           |                         |  |  |                     |        |  |                            |             |        |                          |  |            |                                        |  |  |                          |  |  |                                   |          |  |                         |  |          |         |  |  |           |  |  |  |                    | 
|                |  |              | PSP  |         |                                                  |  | 156,653   |                         |  |  |                    |        |  |                            |            |        |                          |  | 156,653 (i | )                                      |  |  |                         |  |  |                                   | 584.57   |  |                         |  | 25/06/08 |         |  |  |          |  |  |  | 25/06/12           | 
|                |  |              | PSP  |         |                                                  |  | 391,212   |                         |  |  | 292,823 (ii         | )      |  |                            | 98,389 (ii  | )      |                          |  |           |                                        |  |  |                         |  |  |                                   | 472.89   |  |                         |  | 25/06/09 |         |  |  | 98,389    |  |  |  | 25/06/13           | 
|                |  |              | PSP  |         |                                                  |  | 384,220   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 494.5076 |  |                         |  | 29/06/10 |         |  |  | 384,220   |  |  |  | 29/06/14           | 
|                |  |              | LTPP |         |                                                  |  | 362,148   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 605.7605 |  |                         |  | 28/07/11 |         |  |  | 362,148   |  |  |  | 28/07/14& 28/07/15 | 
|                |  |              | LTPP |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 336,702                  |  |  |                                   | 668.2456 |  |                         |  | 28/06/12 |         |  |  | 336,702   |  |  |  | 28/06/15& 28/06/16 | 
|                |  |              | DSP  |         |                                                  |  | 68,960    |                         |  |  |                    |        |  |                            | 68,960 (iii | )      |                          |  |           |                                        |  |  |                         |  |  |                                   | 541.14   |  |                         |  | 11/06/09 |         |  |  |          |  |  |  | 11/06/12           | 
|                |  |              | DSP  |         |                                                  |  | 130,636   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 506.294  |  |                         |  | 15/06/10 |         |  |  | 130,636   |  |  |  | 15/06/13           | 
|                |  |              | DSP  |         |                                                  |  | 97,359    |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 592.6    |  |                         |  | 15/06/11 |         |  |  | 97,359    |  |  |  | 15/06/14           | 
|                |  |              | DSP  |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 75,933                   |  |  |                                   | 658.47   |  |                         |  | 14/06/12 |         |  |  | 75,933    |  |  |  | 14/06/15           | 
|                | 
|Total           |  |              |      |         |                                                  |  | 1,591,188 |                         |  |  | 292,823             |        |  |                            | 167,349     |        |                          |  | 156,653    |                                        |  |  | 412,635                  |  |  |                                   |          |  |                         |  |          |         |  |  | 1,485,387 |  |  |  |                    | 
|                | 
|Andrew Bonfield |  |              |      |         |                                                  |  |           |                         |  |  |                     |        |  |                            |             |        |                          |  |            |                                        |  |  |                          |  |  |                                   |          |  |                         |  |          |         |  |  |           |  |  |  |                    | 
|                |  |              | PSP  |         |                                                  |  | 236,464   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 570.9098 |  |                         |  | 30/11/10 |         |  |  | 236,464   |  |  |  | 30/11/14           | 
|                |  |              | LTPP |         |                                                  |  | 229,463   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 605.7605 |  |                         |  | 28/07/11 |         |  |  | 229,463   |  |  |  | 28/07/14& 28/07/15 | 
|                |  |              | LTPP |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 213,095                  |  |  |                                   | 668.2456 |  |                         |  | 28/06/12 |         |  |  | 213,095   |  |  |  | 28/06/15& 28/06/16 | 
|                |  |              | DSP  |         |                                                  |  | 29,184    |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 592.6    |  |                         |  | 15/06/11 |         |  |  | 29,184    |  |  |  | 15/06/14           | 
|                |  |              | DSP  |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 55,150                   |  |  |                                   | 658.47   |  |                         |  | 14/06/12 |         |  |  | 55,150    |  |  |  | 14/06/15           | 
|                | 
|Total           |  |              |      |         |                                                  |  | 495,111   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 268,245                  |  |  |                                   |          |  |                         |  |          |         |  |  | 763,356   |  |  |  |                    | 
|                | 
|Nick Winser     |  |              |      |         |                                                  |  |           |                         |  |  |                     |        |  |                            |             |        |                          |  |            |                                        |  |  |                          |  |  |                                   |          |  |                         |  |          |         |  |  |           |  |  |  |                    | 
|                |  |              | PSP  |         |                                                  |  | 78,292    |                         |  |  |                    |        |  |                            |            |        |                          |  | 78,292 (i  | )                                      |  |  |                         |  |  |                                   | 584.57   |  |                         |  | 25/06/08 |         |  |  |          |  |  |  | 25/06/12           | 
|                |  |              | PSP  |         |                                                  |  | 195,521   |                         |  |  | 146,348 (ii         | )      |  |                            | 49,173 (ii  | )      |                          |  |           |                                        |  |  |                         |  |  |                                   | 472.89   |  |                         |  | 25/06/09 |         |  |  | 49,173    |  |  |  | 25/06/13           | 
|                |  |              | PSP  |         |                                                  |  | 196,356   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 494.5076 |  |                         |  | 29/06/10 |         |  |  | 196,356   |  |  |  | 29/06/14           | 
|                |  |              | LTPP |         |                                                  |  | 174,986   |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 605.7605 |  |                         |  | 28/07/11 |         |  |  | 174,986   |  |  |  | 28/07/14& 28/07/15 | 
|                |  |              | LTPP |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 163,412                  |  |  |                                   | 668.2456 |  |                         |  | 28/06/12 |         |  |  | 163,412   |  |  |  | 28/06/15& 28/06/16 | 
|                |  |              | DSP  |         |                                                  |  | 33,804    |                         |  |  |                    |        |  |                            | 33,804 (iii | )      |                          |  |           |                                        |  |  |                         |  |  |                                   | 541.14   |  |                         |  | 11/06/09 |         |  |  |          |  |  |  | 11/06/12           | 
|                |  |              | DSP  |         |                                                  |  | 64,370    |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 506.294  |  |                         |  | 15/06/10 |         |  |  | 64,370    |  |  |  | 15/06/13           | 
|                |  |              | DSP  |         |                                                  |  | 48,354    |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  |                         |  |  |                                   | 592.6    |  |                         |  | 15/06/11 |         |  |  | 48,354    |  |  |  | 15/06/14           | 
|                |  |              | DSP  |         |                                                  |  |          |                         |  |  |                    |        |  |                            |            |        |                          |  |           |                                        |  |  | 39,682                   |  |  |                                   | 658.47   |  |                         |  | 14/06/12 |         |  |  | 39,682    |  |  |  | 14/06/15           | 
|                | 
|Total           |  |              |      | 791,683 |                                                  |  |           | 146,348                 |  |  |                     | 82,977 |  |                            |             | 78,292 |                          |  |            | 203,094                                |  |  |                          |  |  |                                   |          |  |                         |  |          | 736,333 |  |  |           |  | 
|                | 
|                | 



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##### Table of Contents

Table 4

Type ofaward


PSP, LTPP
and DSPconditionalawards at
1 April 2012


Awardslapsedduring
year


Awardsvested
in year


Releaseof PSPawardsin year


Awardsgrantedduring
year


Market price
at award(penceexcept #)


Date ofaward(dd/mm/yy)


Conditionalawards at
31 March 2013


Releasedate(dd/mm/yy)Tom King (iv)PSP



18,157











18,157 (i)







$57.2505 #



25/06/08







25/06/12PSP



54,403



40,720 (ii)



13,683 (ii)











$38.6002 #



25/06/09



13,683



25/06/13PSP



57,762



















$37.4465 #



29/06/10



57,762



29/06/14LTPP



45,537



















$49.4093 #



28/07/11



45,537



28/07/14& 28/07/15LTPP



















44,616



$51.9094 #



28/06/12



44,616



28/06/15& 28/06/16DSP



13,804







13,804 (iii)











$39.2373 #



11/06/09







11/06/12DSP



18,776



















$37.7474 #



15/06/10



18,776



15/06/13DSP



13,937



















$48.261 #



15/06/11



13,937



15/06/14DSP



















11,332



$51.2887 #



14/06/12



11,332



14/06/15Total ADSs






222,376



40,720



27,487



18,157



55,948











205,643  (i)
The 2008 PSP award vested partially (at a vesting level of 49.5% of the award) in July 2011 and then entered a retention period. The vested shares were released on the fourth anniversary of the date of grant (ie June
2012). The closing share price on the date of release was 661p (ADS $51.52). (ii)
The 2009 PSP award vested partially in July 2012 at a vesting level of 25.15% of the award. The award then entered a retention period. Cash payments in lieu of dividends accrued during the retention period were paid as
follows: Steve Holliday £27,713 in August 2012 and £15,841 in February 2013; Nick Winser £13,850 and £7,917 respectively; Tom King £17,575 and £10,020 respectively. (iii)
Following the three year deferral period, the 2009 DSP award was released in June 2012. Cash payments in lieu of dividends accrued during the deferral period were paid as follows: Steve Holliday £110,642; Nick
Winser £54,236 and Tom King £75,566. The closing share price on the date of release was 659.50p (ADS $51.19). Exceptionally, this award for Steve Holliday and Nick Winser was made over restricted shares. The award was subject to income
tax and National Insurance Contributions on grant and therefore the shares shown reflect the net number of shares. (iv)
All awards were made over ADSs and each ADS represents five ordinary shares.


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Corporate Governance

Remuneration Report

Implementation report 2012/13

Continued



5. Directors beneficial interests The Directors beneficial interests (which include those of their families) in National Grid ordinary shares of 1117⁄43 pence each are shown below.  Table 5

Ordinary shares at31 March 2013
or, if earlier, onretirement  (i)


Ordinary shares at1 April 2012
or, if later, onappointment *


Options/awards over
ordinary shares at31 March 2013


Options/awards overordinary shares at1 April 2012Sir Peter Gershon


41,486



18,055







Steve Holliday (ii) (iii)


630,476



484,560



1,526,783



1,632,584Andrew Bonfield (ii) (iii)


505



287



766,777



498,532Nick Winser (ii)


295,775



224,473



736,333



791,683Tom King (iv)


274,010



209,285



1,028,215



1,111,880Ken Harvey (v)


5,236



5,236







Philip Aiken


4,900



4,900







Nora Mead Brownell (vi)


5,000



 *







Jonathan Dawson (vii)






 *







Paul Golby


2,500



2,500







Ruth Kelly


800



800







Maria Richter


14,357



14,357







George Rose (v)


6,792



6,792







Mark Williamson (viii)


4,726



 *







Linda Adamany (ix)


2,800 



2,800







Stephen Pettit
(x)


4,061 



4,061







  (i)
There has been no other change in the beneficial interests of the Directors in ordinary shares between 1 April 2013 and 15 May 2013, except in respect of routine monthly purchases under the SIP (see note
(iii) below). (ii)
Each of the Executive Directors, with the exception of Tom King, was for Companies Act purposes deemed to be a potential beneficiary under the National Grid plc 1996 Employee Benefit Trust and the National Grid Employee
Share Trust. Steve Holliday, Andrew Bonfield and Nick Winser thereby have an interest in 16,092 and 600,216 ordinary shares in the aforementioned trusts respectively, as at 31 March 2013 (with the latter trust holding 86,708 ADSs in addition). (iii)
Beneficial interests include shares purchased under the monthly operation of the SIP in the year to 31 March 2013. In April and May 2013 a further 32 shares were purchased on behalf of Steve Holliday and a further
31 shares were purchased on behalf of Andrew Bonfield, thereby increasing their beneficial interests. (iv)
Shares converted from ADSs where each ADS represents five ordinary shares. (v)
Ken Harvey and George Rose will step down from the Board at the close of the 2013 AGM. (vi)
Nora Mead Brownell joined the Board on 1 June 2012. (vii)
Jonathan Dawson joined the Board on 4 March 2013. (viii)
Mark Williamson joined the Board on 3 September 2012. (ix)
Linda Adamany stepped down from the Board on 31 October 2012. (x)
Stephen Pettit stepped down from the Board on 30 July 2012. 6. National Grid share price
range The closing price of a National Grid ordinary share on 28 March 2013 (the last trading day in March 2013) was 765p. The
range during the year (previous 52 weeks) was 765p (high) and 633p (low). The Register of Directors Interests contains full details of shareholdings and options/awards held by Directors as at 31 March 2013. The Remuneration Report has been approved by the Board and signed on its behalf by: Ken Harvey Chairman of
the Remuneration Committee 15 May 2013









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Shareholder engagement    We believe it is important to maintain effective channels of communication with our debt and equity
institutional investors and individual shareholders to understand their views about the Company and ensure they are provided with timely and appropriate information on our strategy, performance, objectives, financing and other developments. The Company maintains appropriate controls on the dissemination of price sensitive information. For more information on the role of
the Disclosure Committee, see page 65. A shareholder analysis and a list of material interests in our shares are set out on pages 187
and 183 respectively. Institutional investors The Board oversees investor engagement, which is managed by the Chief Executive, Finance Director and Director of Investor Relations. We undertake
a comprehensive programme of engagement for institutional investors and research analysts, including meetings, presentations, webinars and attendance at key investor conferences, which provides the opportunity for our current and potential investors
to meet with Executive and operational management. In the past year, we have focused on updating investors about regulatory processes
in the UK and US, notably Ofgems RIIO price controls. The Board receives regular feedback on investor perceptions and opinions
about the Company and specialist advisors, our brokers and the Director of Investor Relations provide updates on market sentiment to the Board. The Board also receives annually the results of an independent audit of investor perceptions. Sir Peter contacts our major shareholders at the time of our full-year results to offer them the opportunity to meet with him, the Senior
Independent Director, and any of our other Non-executive Directors, so they can discuss any issues they feel unable to raise with members of the Executive team. In addition to the engagement activities set out above, this year we will be introducing a stewardship meeting. With a governance theme, the event
aims to provide investors with an insight into our decision-making processes, the work of our committees and the implications of the new regulatory regimes in the UK and US. The event will also provide the opportunity for attendees to ask questions
and meet members of the Board and for our newer Non-executive Directors to understand the views and concerns of our shareholders about the Company.
 Debt investors Over the last year representatives from our treasury team, together with the Finance Director and other senior management from across the
business, have met with debt investors in Australia, Canada, Europe, the Far East and the US. These events have been used to discuss key topics such as Ofgems RIIO price controls and the regulatory process in the US. A series of events were
held ahead of our issuance of £2.1 billion of hybrid bonds, to improve investor awareness and increase take up. With the total
debt issued during the year at £5.1 billion, it is important for us to explain to debt investors why this money is required and what protections are in place to safeguard their potential investment. We also communicate to our debt investors
through regular Company announcements as well as via the debt investor section of our website, which contains bond prospectuses, credit ratings, materials on the retail bond issued in 2011 and subsidiary year-end reports. The website also contains
information on the long-term debt maturity profile, enabling investors to see our future refinancing needs. Individual shareholders Engagement with individual shareholders, who represent more than 95% of the shareholders on our share register, is led by the Group
General Counsel & Company Secretary. Shareholders are invited to learn more about the Company through the shareholder networking programme, see below, and the exhibits at the AGM. In addition, shareholders were also invited by Capita Registrars to visit their offices to increase awareness of the services they provide to our
shareholders. Annual General Meeting This will be held on Monday 29 July 2013 at The International Convention Centre in Birmingham. The Notice of Meeting for the 2013 AGM, available on our website, sets out in full the resolutions for consideration by shareholders
together with explanatory notes and further information on the Directors standing for election and re-election. The AGM can be viewed by webcast on our website where information on how to view the webcast can also be found. Shareholder networking The
shareholder networking programme normally takes place twice a year and includes visits to UK operational sites and presentations by senior managers and employees over two days. The costs of the programme (including reasonable shareholder travel to
and from the event) are paid for by the Company. If you are a UK resident shareholder and would like to take part please apply online
via the Investors page on our website. You can also apply in person at the AGM. Only those successful in the selection ballot will be contacted, with priority given to those who have not recently attended.


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Financial Statements Introduction to the financial statements  We have adopted a revised presentational format to provide shareholders and
users of these financial statements with additional information and guidance and to make them easier to understand. Throughout these
financial statements we have included Keeping it simple boxes, providing commentary in plain English on what the disclosures mean and why they are important to the understanding of our financial performance and position. We also include
a number of boxes highlighting Our strategy in action which draw out the key elements of our business model, set out in the Strategic Review on pages 01 to 57, and show how the disclosures reflect this strategy.  Keeping it
simple  Audit opinions
 We have two audit opinions on our financial statements, reflecting our dual
listing on the London Stock Exchange and the New York Stock Exchange. Due to the different reporting requirements for each listing, our auditors are required to confirm compliance with each set of standards in a prescribed format. There are also
additional specific disclosure requirements due to our US listing which are included in the notes.  Consolidated
financial statements  We are required to present certain minimum
information in the primary financial statements, which together set out the overview of the results of the business for the year and financial position at year end. 
The consolidated income statement shows all revenue earned and costs incurred in the year, with the difference being the overall profit for the
year.  The consolidated statement of comprehensive income records
certain items as prescribed by the accounting rules. For us, the majority of the income or expense included here relates to movements in actuarial assumptions on pension schemes and the associated tax impact. These items are not part of profit for
the year, yet are important to allow the reader to gain a more comprehensive picture of our performance as a whole. 
The consolidated statement of financial position sets out all the Groups assets and liabilities at the year end, analysed between the net
assets we have for use in the business and those held for sale. As a capital intensive business, we have significant amounts of physical assets and corresponding borrowings.
 The consolidated statement of changes in equity shows the additions (where it
came from) and reductions (where it went) to equity. For us, the main items included here are the profit earned and dividends paid in the year. 
The consolidated cash flow statement shows how the cash balance has moved during the year. Cash inflows and outflows are presented to allow users
to understand how they relate to the day-to-day operations of the business (Operating activities); the money that has been spent or earned on assets in the year, including acquisitions of physical assets or other businesses (Investing activities);
and the cash raised from debt or share issues and other loan borrowings or repayments (Financing activities).  Notes 
Notes to the financial statements provide additional information required by statute, accounting standards or other regulations to assist in a
more detailed understanding of the primary financial statements. In many notes we have included an accounting policy that describes how the transactions or balance in that note have been measured, recognised and disclosed. The basis of preparation
section provides details of accounting policies that apply to transactions and balances in general.
    92National Grid plc Annual Report and Accounts 2012/13

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Statement of Directors responsibilities   The Directors are responsible for preparing the Annual Report and Accounts, including the
consolidated financial statements and the Company financial statements, the Directors Report, including the Remuneration Report and the Strategic Review, in accordance with applicable law and regulations. Company law requires the Directors to prepare financial statements for each financial year. Under that law the Directors have prepared the
consolidated financial statements in accordance with International Financial Reporting Standards (IFRS) as adopted by the European Union, and the Company financial statements and the Remuneration Report in accordance with applicable law and United
Kingdom Accounting Standards (United Kingdom generally accepted accounting practice, UK GAAP). In preparing the consolidated financial statements, the Directors have also elected to comply with IFRS, issued by the International Accounting Standards
Board (IASB). Under company law the Directors must not approve the financial statements unless they are satisfied that they give a true and fair view of the state of affairs of the Company on a consolidated and individual basis and of the profit or
loss of the Company on a consolidated basis for that period. In preparing these financial statements, the Directors are required to:  

select suitable accounting policies and then apply them consistently; 

make judgements and estimates that are reasonable and prudent; 

state that the consolidated financial statements comply with IFRS as issued by the IASB and IFRS adopted by the European Union and, with regard to the Company financial statements, that applicable
UK Accounting Standards have been followed, subject to any material departures disclosed and explained in the financial statements; and 

prepare the consolidated financial statements and Company financial statements on a going concern basis unless it is inappropriate to presume
that the Company, on a consolidated and individual basis, will continue in business, in which case there should be supporting assumptions or qualifications as necessary.
 The Directors are responsible for keeping adequate accounting records that are sufficient to show
and explain the Companys transactions and disclose with reasonable accuracy at any time the financial position of the Company on a consolidated and individual basis, and to enable them to ensure that the consolidated financial statements
comply with the Companies Act 2006 and Article 4 of the IAS Regulation and the Company financial statements and the Remuneration Report comply with the Companies Act 2006. They are also responsible for safeguarding the assets of the Company and its
subsidiaries and hence for taking reasonable steps for the prevention and detection of fraud and other irregularities. Each of the
Directors, whose names and functions are listed on pages 26 and 27, confirms that:  

to the best of their knowledge, the consolidated financial statements and the Company financial statements, which have been prepared in accordance with IFRS as issued by the IASB and IFRS as
adopted by the European Union and UK GAAP respectively, give a true and fair view of the assets, liabilities, financial position and profit of the Company on a consolidated and individual basis; 

to the best of their knowledge, the Annual Report and Accounts includes a fair review of the development and performance of the business and the position of the Company on a consolidated and
individual basis, together with a description of the principal risks and uncertainties that it faces; and 

they consider that the Annual Report and Accounts, taken as a whole, is fair, balanced and understandable and provides the information necessary for shareholders to assess the Companys
performance, business model and strategy. By order of the Board Alison Kay Group
General Counsel & Company Secretary 15 May 2013 Company number: 4031152
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Financial Statements  [INTENTIONALLY LEFT BLANK]
    94National Grid plc Annual Report and Accounts 2012/13

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Report of Independent
Registered Public Accounting Firm to the Board of Directors and Shareholders of National Grid plc  Audit opinion for Form 20-F In our opinion, the accompanying consolidated statements of financial position and the related consolidated income statements, consolidated
statements of comprehensive income, consolidated cash flow statements and consolidated statements of changes in equity, present fairly, in all material respects, the financial position of National Grid plc and its subsidiaries at 31 March 2013
and 31 March 2012, and the results of their operations and their cash flows for each of the three years in the period ended 31 March 2013 in conformity with International Financial Reporting Standards as issued by the International
Accounting Standards Board and in conformity with International Financial Reporting Standards as adopted by the European Union. Also
in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of 31 March 2013, based on criteria established in Internal Control  Integrated Framework issued by the Committee of
Sponsoring Organizations of the Treadway Commission (COSO). The Companys management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness
of internal control over financial reporting, included in the Additional information section appearing on page 179 of the 2013 Annual Report and Accounts. Our responsibility is to express opinions on these financial statements and on the Companys internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of
the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective
internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over
financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as
we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.
 A companys internal control over financial reporting is a process designed to provide
reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A companys internal control over financial
reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide
reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in
accordance with authorisations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorised acquisition, use, or disposition of the companys assets that could
have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may
not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the
policies or procedures may deteriorate. PricewaterhouseCoopers LLP London United Kingdom 15 May 2013
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Financial Statements Contents of financial statements   Consolidated financial statements under IFRSBasis of preparation97

Basis of preparation99

Recent accounting developmentsPrimary statements100

Consolidated income statement101

Consolidated statement of comprehensive income102

Consolidated statement of financial position103

Consolidated statement of changes in equity104

Consolidated cash flow statementNotes to the consolidated financial statements  analysis of items in the primary statements105

Note 1



Segmental analysis108

Note 2



Operating costs111

Note 3



Exceptional items, remeasurements and stranded cost recoveries114

Note 4



Finance income and costs115

Note 5



Taxation119

Note 6



Earnings per share120

Note 7



Dividends120

Note 8



Goodwill121

Note 9



Other intangible assets123

Note 10



Property, plant and equipment125

Note 11



Other non-current assets125

Note 12



Financial and other investments126

Note 13



Investments in joint ventures and associates127

Note 14



Derivative financial instruments130

Note 15



Inventories and current intangible assets131

Note 16



Trade and other receivables132

Note 17



Cash and cash equivalents133

Note 18



Businesses classified as held for sale134

Note 19



Borrowings135

Note 20



Trade and other payables136

Note 21



Other non-current liabilities136

Note 22



Pensions and other post-retirement benefits138

Note 23



Provisions140

Note 24



Share capital141

Note 25



Other equity reserves142

Note 26



Net debt
 Notes to the consolidated financial statements  supplementary information143

Note 27



Commitments and contingencies144

Note 28



Related party transactions144

Note 29



Actuarial information on pensions and other post-retirement benefits147

Note 30



Financial risk153

Note 31



Commodity risk154

Note 32



Borrowing facilities155

Note 33



Subsidiary undertakings, joint ventures and associates156

Note 34



Sensitivities on areas of estimation and uncertainty158

Note 35



Additional disclosures in respect of guaranteed securitiesCompany financial statements under UK
GAAPBasis of preparation165

Company accounting policiesPrimary statement166

Company balance sheetNotes to the Company financial statements167

Note 1



Fixed asset investments167

Note 2



Debtors167

Note 3



Creditors168

Note 4



Derivative financial instruments168

Note 5



Investments168

Note 6



Borrowings168

Note 7



Called up share capital169

Note 8



Reserves169

Note 9



Reconciliation of movements in total shareholders funds169

Note 10



Parent Company guarantees169

Note 11



Audit fees
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Basis of preparation    Accounting policies describe our approach to recognising and measuring transactions in the year. Accounting policies applicable across the
financial statements are shown below. Accounting policies that are specific to a component of the financial statements have been incorporated into the note that provides additional information regarding that component.
 This section also shows areas of judgement and key sources of estimation
uncertainty in these financial statements as well as new EU endorsed accounting standards, amendments and interpretations, whether these are effective in 2013 or later years. We explain how significant changes are expected to affect our
performance. National Grids principal activities involve the transmission and distribution of electricity and gas in
Great Britain and northeastern US. The Company is a public limited liability company incorporated and domiciled in England, with its registered office at 1-3 Strand, London WC2N 5EH. The Company has its primary listing on the London Stock Exchange and is also quoted on the New York Stock Exchange. These consolidated financial
statements were approved for issue by the Board of Directors on 15 May 2013. These consolidated financial statements have been
prepared in accordance with International Accounting Standards (IAS) and International Financial Reporting Standards (IFRS) and related interpretations as issued by the IASB and as adopted by the EU. They are prepared on the basis of all IFRS
accounting standards and interpretations that are mandatory for periods ending 31 March 2013 and in accordance with the Companies Act 2006 applicable to companies reporting under IFRS and Article 4 of the EU IAS Regulation. The 2012 and 2011
comparative financial information has also been prepared on this basis. The consolidated financial statements have been prepared on an
historical cost basis, except for the recording of pension assets and liabilities, the revaluation of derivative financial instruments and certain commodity contracts and investments classified as available-for-sale. The consolidated financial statements have been prepared on a going concern basis following the assessment made by the Directors as set out on
page 57. These consolidated financial statements are presented in pounds sterling, which is also the functional currency of the
Company. The preparation of financial statements requires management to make estimates and assumptions that affect the reported
amounts of assets and liabilities, disclosures of contingent assets and liabilities and the reported amounts of revenue and expenses during the reporting period (see accounting policy C). Actual results could differ from these estimates.
 A. Basis of consolidation The consolidated financial statements incorporate the financial statements of the Company and its subsidiaries, together with a share of the
results, assets and liabilities of jointly controlled entities (joint ventures) and associates using the equity method of accounting, where the investment is carried at cost plus post-acquisition changes in the share of net assets of the joint
venture, less any provision for impairment. A subsidiary is defined as an entity controlled by the Company. Control is achieved where
the Company has the power to govern the financial and operating policies of an entity so as to obtain benefits from its activities. Losses in excess of the consolidated interest in joint ventures and associates are not recognised, except where the Company or its subsidiaries
have made a commitment to make good those losses. Where necessary, adjustments are made to bring the accounting policies used in the
individual financial statements of the Company, subsidiaries, joint ventures and associates into line with those used by the Company in its consolidated financial statements under IFRS. Intercompany transactions are eliminated. The results of subsidiaries, joint ventures and associates acquired or disposed of during the year are included in the consolidated income
statement from the effective date of acquisition or up to the effective date of disposal, as appropriate. Acquisitions are accounted
for using the acquisition method, where the purchase price is allocated to the identifiable assets acquired and liabilities assumed on a fair value basis and the remainder recognised as goodwill. B. Foreign currencies Transactions in currencies other than the functional currency of the Company or subsidiary concerned are recorded at the rates of exchange
prevailing on the dates of the transactions. At each reporting date, monetary assets and liabilities that are denominated in foreign currencies are retranslated at closing exchange rates. Non monetary assets are not retranslated unless they are
carried at fair value. Gains and losses arising on the retranslation of monetary assets and liabilities are included in the income
statement, except where the adoption of hedge accounting requires inclusion in other comprehensive income  note 14. On
consolidation, the assets and liabilities of operations that have a functional currency different from the Companys functional currency of pounds sterling, principally our US operations that have a functional currency of US dollars, are
translated at exchange rates prevailing at the reporting date. Income and expense items are translated at the weighted average exchange rates for the period where these do not differ materially from rates at the date of the transaction. Exchange
differences arising are classified as equity and transferred to the consolidated translation reserve.
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Financial Statements Basis of preparation Continued    C. Areas of judgement and key sources of estimation uncertainty The preparation of financial statements requires management to make estimates and assumptions that affect the reported amounts of assets and
liabilities, disclosures of contingent assets and liabilities and the reported amounts of revenue and expenses during the reporting period. Actual results could differ from these estimates. Information about such judgements and estimations is
contained in the notes to the financial statements, and the key areas are summarised below. Areas of judgement that have the most
significant effect on the amounts recognised in the financial statements are as follows:  

The categorisation of certain items as exceptional items, remeasurements and stranded cost recoveries and the definition of adjusted earnings  notes 3 and 6. 

Classification of business activities as held for sale and discontinued operations  note 18. 

Hedge accounting  note 14. 

Energy purchase contracts classification as being for normal purchase, sale or usage  note 27. IFRS provides certain options available within accounting standards. Choices we have made, and continue to make, include the following:  

Presentation formats. We use the nature of expense method for our income statement and total our statement of financial position to net assets and total equity. In the income statement, we present
subtotals of total operating profit, profit before tax and profit from continuing operations, together with additional subtotals excluding exceptional items, remeasurements and stranded cost recoveries. Exceptional items, remeasurements and stranded
cost recoveries are presented separately on the face of the income statement. 

Customer contributions. Contributions received prior to 1 July 2009 towards capital expenditure are recorded as deferred income and amortised in line with the depreciation on the associated
asset. 

Financial instruments. We normally opt to apply hedge accounting in most circumstances where this is permitted. For net investment hedges, we have chosen to use the spot rate method, rather than
the alternative forward rate method.
 Key sources of estimation uncertainty that have significant risk of causing a material adjustment
to the carrying amounts of assets and liabilities within the next financial year are as follows:  

Impairment of goodwill  note 8. 

Review of residual lives, carrying values and impairment charges for other intangible assets and property, plant and equipment  notes 9 and 10. 

Estimation of liabilities for pensions and other post-retirement benefits  notes 22 and 29. 

Valuation of financial instruments and derivatives  notes 14, 30 and 31. 

Revenue recognition and assessment of unbilled revenue  note 1. 

Recoverability of deferred tax assets  note 5. 

Environmental and decommissioning provisions  note 23. In
order to illustrate the impact that changes in assumptions could have on our results and financial position, we have included sensitivity analysis in note 34.
   98National Grid plc Annual Report and Accounts 2012/13

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Recent accounting developments   New IFRS accounting standards and interpretations adopted in 2012/13 During the year ended 31 March 2013, the Company has not adopted any new IFRS, IAS or amendments issued by the IASB, or interpretations
issued by the IFRS Interpretations Committee, which have had a material impact on the Companys consolidated financial statements. New IFRS accounting standards and interpretations not yet adopted The Company enters into a significant number of transactions that fall within the scope of IFRS 9 on financial instruments. The IASB is completing
IFRS 9 in phases and the Company is evaluating the impact of the standard as it develops. It is currently expected that the standard will be required to be adopted by the Company on 1 April 2015. We are currently assessing the likely impact of
this standard on the Companys consolidated financial statements. IFRS 10 on consolidated financial statements, IFRS 11 on joint
arrangements, IFRS 12 on disclosures of interests in other entities and IFRS 13 on fair value measurements and consequent amendments to IAS 27 and IAS 28 were issued in May 2011. These standards are not expected to have a significant impact on the
consolidated financial statements. The standards are required to be adopted by the Company on 1 April 2013. The amended version
of IAS 19 on employee benefits, issued in June 2011 and effective for periods beginning after 1 January 2013, requires net interest to be calculated on the net defined benefit asset/(liability) using the same discount rate used to measure the
defined benefit obligation. Where the expected return on assets exceeds the discount rate, the adoption of the amended standard will result in a reduction in reported net income and an increase in other comprehensive income (OCI). The impact on the
Companys financial statements for the period of initial application of the amended standard will depend upon reported pension assets and liabilities and the relationship between the expected return on assets and the discount rate at the date
of adoption. If the amended standard had been adopted for the year ended 31 March 2013, net income would have been reduced by £142m and OCI increased by £146m. The amendments to IAS 1 (Presentation of Financial Statements), issued in June 2011 and effective for periods beginning on or after 1 July
2012, require entities to group items presented in OCI based on whether they are potentially reclassifiable to profit or loss subsequently. It also requires tax associated with any items presented before tax to be shown separately for each of the
two groups of OCI items. These amendments are presentational only and will not affect the results of the Group when adopted. Other
standards and interpretations or amendments thereto which have been issued, but are not yet effective, are not expected to have a material impact on the Companys consolidated financial statements.
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Financial Statements Consolidated income statement for the years ended 31 March   Notes


2013
£m


2013
£m


2012
£m


2012
£m


2011
£m


2011
£mRevenue


1(a
)






14,359







13,832







14,343Operating costs


2







(10,605)







(10,293)







(10,598)Operating profitBefore exceptional items, remeasurements and stranded cost recoveries


1(b
)


3,644







3,495







3,600Exceptional items, remeasurements and stranded cost recoveries


3



110







44







145Total operating profit


1(b
)






3,754







3,539







3,745Finance incomeBefore exceptional items


4



1,252







1,301







1,281Exceptional items


3,4



















43Total finance income


4







1,252







1,301







1,324Finance costsBefore exceptional items and remeasurements


4



(2,172)







(2,218)







(2,415)Exceptional items and remeasurements


3,4



68







(70)







(37)Total finance costs


4







(2,104)







(2,288)







(2,452)Share of post-tax results of joint ventures and associates


13







18







7







7Profit before taxBefore exceptional items, remeasurements and stranded cost recoveries


1(b
)


2,742







2,585







2,473Exceptional items, remeasurements and stranded cost recoveries


3



178







(26)







151Total profit before tax


1(b
)






2,920







2,559







2,624TaxationBefore exceptional items, remeasurements and stranded cost recoveries


5



(686)







(755)







(722)Exceptional items, remeasurements and stranded cost recoveries


3,5



62







234







261Total taxation


5







(624)







(521)







(461)Profit after taxBefore exceptional items, remeasurements and stranded cost recoveries






2,056







1,830







1,751Exceptional items, remeasurements and stranded cost recoveries


3



240







208







412Profit for the year










2,296







2,038







2,163Attributable to:Equity shareholders of the parent










2,295







2,036







2,159Non-controlling interests










1







2







42,296







2,038







2,163Earnings per share*Basic


6







62.6p







55.6p







61.2pDiluted


6







62.3p







55.4p







6.9p *Comparative amounts have been restated to reflect the impact of additional shares issued as scrip dividends The notes on pages 105 to 164 form part of the consolidated financial statements.
    100National Grid plc Annual Report and Accounts 2012/13

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Consolidated statement of comprehensive income for the years ended 31 March  Notes


2013
£m


2012
£m


2011
£mProfit for the year






2,296



2,038



2,163Other comprehensive (loss)/income:Exchange adjustments






117



27



(95)Actuarial net (losses)/gains


22



(930
)


(1,325
)


571Deferred tax on actuarial net gains and losses


5



249



403



(181)Net (losses)/gains in respect of cash flow hedges






(31
)


(18
)


7Transferred to profit or loss on cash flow hedges






73



19



(7)Deferred tax on cash flow hedges


5



(13
)


2



(2)Net gains on available-for-sale investments






20



16



16Transferred to profit or loss on sale of available-for-sale investments






(10
)


(9
)


(3)Deferred tax on available-for-sale investments


5



(2
)


(2
)


(1)Share of post-tax other comprehensive loss of joint ventures














(4)Other comprehensive (loss)/income for the year, net of tax






(527
)


(887
)


301Total comprehensive income for the year






1,769



1,151



2,464Attributable to:Equity shareholders of the parent






1,768



1,149



2,460Non-controlling interests






1



2



41,769



1,151



2,464
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##### Table of Contents

Financial Statements Consolidated statement of financial position as at 31 March   Notes


2013
£m


2012
£mNon-current assetsGoodwill


8



5,028



4,776Other intangible assets


9



589



546Property, plant and equipment


10



36,592



33,701Other non-current assets


11



104



95Pension assets


22



195



155Financial and other investments


12



278



251Investments in joint ventures and associates


13



371



341Derivative financial assets


14



1,972



1,819Total non-current assets






45,129



41,684Current assetsInventories and current intangible assets


15



291



376Trade and other receivables


16



2,910



1,971Financial and other investments


12



5,431



2,391Derivative financial assets


14



273



317Cash and cash equivalents


17



671



332Total current assets






9,576



5,387Assets of businesses held for sale


18







264Total assets






54,705



47,335Current liabilitiesBorrowings


19



(3,448
)


(2,492)Derivative financial liabilities


14



(407
)


(162)Trade and other payables


20



(3,051
)


(2,685)Current tax liabilities






(231
)


(383)Provisions


23



(308
)


(282)Total current liabilities






(7,445
)


(6,004)Non-current liabilitiesBorrowings


19



(24,647
)


(20,533)Derivative financial liabilities


14



(1,274
)


(1,269)Other non-current liabilities


21



(1,884
)


(1,921)Deferred tax liabilities


5



(4,076
)


(3,738)Pensions and other post-retirement benefit obligations


22



(3,694
)


(3,088)Provisions


23



(1,452
)


(1,449)Total non-current liabilities






(37,027
)


(31,998)Liabilities of businesses held for sale


18







(87)Total liabilities






(44,472
)


(38,089)Net assets






10,233



9,246EquityCalled up share capital


24



433



422Share premium account






1,344



1,355Retained earnings






13,132



12,297Other equity reserves


25



(4,681
)


(4,835)Shareholders equity






10,228



9,239Non-controlling interests






5



7Total equity






10,233



9,246 The consolidated financial statements set out on pages 97 to 164 were approved by the Board of Directors on
15 May 2013 and were signed on its behalf by: Sir Peter Gershon Chairman Andrew Bonfield Finance Director
    102National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

Consolidated statement of changes in equity for the years ended 31 March   Called upshare
capital
£m



Sharepremium
account
£m



Retainedearnings
£m



Otherequity
reserves
£m
(i)


Totalshareholders
equity
£m



Non-controlling
interests
£m



Totalequity
£mAt 1 April 2010


298



1,366



7,316



(4,781
)


4,199



12



4,211Profit for the year










2,159







2,159



4



2,163Total other comprehensive income/(loss) for the year










390



(89
)


301







301Total comprehensive income/(loss) for the year










2,549



(89
)


2,460



4



2,464Rights issue


113











3,101



3,214







3,214Transfer between reserves










3,101



(3,101
)










Equity dividends










(1,064
)






(1,064
)






(1,064
)Scrip dividend related share issue


5



(5
)


206







206







206Issue of treasury shares










18







18







18Purchase of own shares










(3
)






(3
)






(3
)Other movements in non-controlling interests






















(7
)


(7
)Share-based payment










25







25







25Tax on share-based payment










5







5







5At 31 March 2011


416



1,361



12,153



(4,870
)


9,060



9



9,069Profit for the year










2,036







2,036



2



2,038Total other comprehensive income/(loss) for the year










(922
)


35



(887
)






(887
)Total comprehensive income for the year










1,114



35



1,149



2



1,151Equity dividends










(1,319
)






(1,319
)






(1,319
)Scrip dividend related share issue


6



(6
)


313







313







313Issue of treasury shares










13







13







13Purchase of own shares










(4
)






(4
)






(4
)Other movements in non-controlling interests






















(4
)


(4
)Share-based payment










24







24







24Tax on share-based payment










3







3







3At 31 March 2012


422



1,355



12,297



(4,835
)


9,239



7



9,246Profit for the year










2,295







2,295



1



2,296Total other comprehensive income/(loss) for the year










(681
)


154



(527
)






(527
)Total comprehensive income for the year










1,614



154



1,768



1



1,769Equity dividends










(1,433
)






(1,433
)






(1,433
)Scrip dividend related share issue


11



(11
)


623







623







623Issue of treasury shares










19







19







19Purchase of own shares










(6
)






(6
)






(6
)Other movements in non-controlling interests






















(3
)


(3
)Share-based payment










20







20







20Tax on share-based payment










(2
)






(2
)






(2
)At 31 March 2013


433



1,344



13,132



(4,681
)


10,228



5



10,233  (i)
For further details of other equity reserves, see note 25.
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##### Table of Contents

Financial Statements Consolidated cash flow statement for the years ended 31 March   Notes


2013
£m


2012
£m


2011
£mCash flows from operating activitiesTotal operating profit


1(b)



3,754



3,539



3,745Adjustments for:Exceptional items, remeasurements and stranded cost recoveries


3



(110
)


(44
)


(145
)Depreciation, amortisation and impairment






1,361



1,282



1,245Share-based payment charge






20



24



25Changes in working capital






(410
)


146



185Changes in provisions






(53
)


(116
)


(93
)Changes in pensions and other post-retirement benefit obligations






(413
)


(386
)


(304
)Cash flows relating to exceptional items






(112
)


(205
)


(147
)Cash flows relating to stranded cost recoveries










247



343Cash generated from operations






4,037



4,487



4,854Tax (paid)/received






(287
)


(259
)


4Net cash inflow from operating activities






3,750



4,228



4,858Cash flows from investing activitiesAcquisition of investments






(14
)


(13
)


(135
)Proceeds from sale of investments in subsidiaries






183



365



11Purchases of intangible assets






(175
)


(203
)


(176
)Purchases of property, plant and equipment






(3,214
)


(3,147
)


(2,958
)Disposals of property, plant and equipment






32



24



26Dividends received from joint ventures






21



26



9Interest received






29



24



26Net movements in short-term financial investments






(2,992
)


553



(1,577
)Net cash flow used in investing activities






(6,130
)


(2,371
)


(4,774
)Cash flows from financing activitiesProceeds of rights issue














3,214Proceeds from issue of treasury shares






19



13



18Purchase of own shares






(6
)


(4
)


(3
)Proceeds received from loans






5,062



1,809



767Repayment of loans






(1,210
)


(1,914
)


(2,878
)Net movements in short-term borrowings and derivatives






452



(49
)


348Interest paid






(792
)


(749
)


(965
)Exceptional finance costs on the redemption of debt














(73
)Dividends paid to shareholders






(810
)


(1,006
)


(858
)Net cash flow from/(used in) financing activities






2,715



(1,900
)


(430
)Net increase/(decrease) in cash and cash equivalents


26(a)



335



(43
)


(346
)Exchange movements






14







(3
)Net cash and cash equivalents at start of year






299



342



691Net cash and cash equivalents at end of
year (i)


17



648



299



342  (i)
Net of bank overdrafts of £23m (2012: £33m; 2011: £42m).
    104National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

Notes to the consolidated financial statements  analysis of items in the primary statements 1. Segmental analysis  This note sets out the financial performance of the business split into the different parts of the business (operating segments). We monitor and
manage the performance of these operating segments on a day-to-day basis.  Our strategy in action 
We own a portfolio of businesses that includes a mixture of cash generative developed assets with minimal investment requirements (such as
National Grid Metering, included within Other), businesses with low to medium levels of growth and positive cash generation (such as UK Gas Distribution and US Regulated) and businesses with high levels of investment and growth (such as UK
Transmission).  We generate 96% of our revenue from our regulated
businesses in the UK and US. We work with our regulators to obtain robust regulatory agreements that balance the risks we face with the opportunity to deliver reasonable returns for our investors. When investing in non-regulated businesses we aim to
leverage our core capabilities to deliver higher returns for investors.  Our regulated businesses earn revenue for the transmission, distribution and generation services they have provided during the year. The revenue recognised may differ from the revenue allowed under our regulatory agreements and
differences are adjusted against future prices. Our non-regulated businesses earn revenue in line with their contractual terms. Revenue primarily represents the sales value derived from the generation, transmission and distribution of energy,
together with the sales value derived from the provision of other services to customers and previously, recovery of US stranded costs during the year. It excludes value added (sales) tax and intra-group sales. Revenue includes an assessment of unbilled energy and transportation services supplied to customers between the date of the last meter reading and
the year end. This is estimated based on historical consumption and weather patterns. Where revenue exceeds the maximum amount
permitted by regulatory agreement and adjustments will be made to future prices to reflect this over-recovery, no liability is recognised, as such an adjustment relates to the provision of future services. Similarly no asset is recognised where a
regulatory agreement permits adjustments to be made to future prices in respect of an under-recovery. US stranded costs are various
generation-related costs incurred prior to the divestiture of generation assets beginning in the late 1990s and costs of legacy contracts that are being recovered from customers. The recovery of stranded costs and other amounts allowed to be
collected from customers under regulatory arrangements is recognised in the period in which these amounts are recoverable from customers. The recovery of stranded costs was substantially completed at 31 March 2012. We present revenue and the results of the business analysed by operating segment, based on the information the Board of Directors uses internally
for the purposes of evaluating the performance of operating segments and determining resource allocation between operating segments. The Board is National Grids chief operating decision-making body (as defined by IFRS 8 Operating
Segments) and assesses the performance of operations principally on the basis of operating profit before exceptional items, remeasurements and stranded cost recoveries (see note 3).
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##### Table of Contents

Financial Statements Notes to the consolidated financial statements Continued   1. Segmental analysis continued The following table describes the main activities for each operating segment:  UK Transmission

High voltage electricity transmission networks, the gas transmission network in Great Britain, UK liquefied natural gas (LNG) storage activities and the French electricity
interconnector.UK Gas Distribution

Four of the eight regional networks of Great Britains gas distribution system.US Regulated

Gas distribution networks, electricity distribution networks and high voltage electricity
transmission networks in New York and New England (including EnergyNorth and Granite State up to the date they were sold on 3 July 2012) and electricity generation facilities in New York and Massachusetts. Other activities primarily relate to non-regulated businesses and other commercial operations not included within
the above segments, including: UK based gas and electricity metering activities; UK property management; a UK LNG import terminal; other LNG operations; US unregulated transmission pipelines; together with corporate activities. Sales between operating segments are priced considering the regulatory and legal requirements to which the businesses are subject. The analysis of
revenue by geographical area is on the basis of destination. There are no material sales between the UK and US geographical areas. (a)
Revenue  2013




2012




2011Total
sales £m


Sales
between segments £m


Salesto thirdparties£m




Total
sales
£m


Sales
between
segments
£m


Salesto thirdparties£m




Total
sales
£m


Sales
between
segments
£m


Salesto thirdparties£mOperating segmentsUK Transmission


4,246



(86
)


4,160





3,804



(5
)


3,799





3,484



(7
)


3,477UK Gas Distribution


1,714



(47
)


1,667





1,605



(52
)


1,553





1,524



(60
)


1,464US Regulated


7,918







7,918





7,795







7,795





8,746







8,746Other activities


642



(28
)


614





715



(30
)


685





678



(22
)


65614,520



(161
)


14,359





13,919



(87
)


13,832





14,432



(89
)


14,343Total excluding stranded cost recoveries










14,359













13,553













13,988Stranded cost recoveries
























279













35514,359













13,832













14,343Geographical areasUK










6,421













6,000













5,556US










7,938













7,832













8,78714,359













13,832













14,343 In the UK, there was a cumulative over-recovery of £16m* at 31 March 2013 (2012: under-recovery of
£26m*; 2011: under-recovery of £34m*). In the US, accumulated regulatory entitlements to future revenue net of over- or under-recoveries amounted to £1,330m* at 31 March 2013 (2012: £1,429m*; 2011: £1,618m*). *Unaudited
    106National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

1. Segmental analysis
continued (b) Operating profit A reconciliation of the operating segments measure of profit to total profit before tax is provided below. Further details of the exceptional items, remeasurements and stranded cost recoveries are provided in note 3.  Before exceptional
items,        remeasurements and stranded        cost recoveries




After exceptional
items,        remeasurements and stranded        cost recoveries2013
£m


2012
£m


2011
£m




2013
£m


2012
£m


2011
£mOperating segmentsUK Transmission


1,609



1,354



1,363





1,566



1,354



1,293UK Gas Distribution


794



763



711





763



739



671US Regulated


1,253



1,190



1,407





1,437



1,154



1,704Other activities


(12
)


188



119





(12
)


292



773,644



3,495



3,600





3,754



3,539



3,745Geographical areasUK


2,536



2,353



2,226





2,462



2,357



2,055US


1,108



1,142



1,374





1,292



1,182



1,6903,644



3,495



3,600





3,754



3,539



3,745Reconciliation to profit before tax:Operating profit


3,644



3,495



3,600





3,754



3,539



3,745Finance income


1,252



1,301



1,281





1,252



1,301



1,324Finance costs


(2,172
)


(2,218
)


(2,415
)




(2,104
)


(2,288
)


(2,452
)Share of post-tax results of joint ventures and associates


18



7



7





18



7



7Profit before tax


2,742



2,585



2,473





2,920



2,559



2,624(c) Capital expenditure, depreciation and
amortisationCapital expenditure




Depreciation and amortisation2013
£m


2012
£m


2011
£m




2013
£m


2012
£m


2011
£mOperating segmentsUK Transmission


1,680



1,397



1,432





(489
)


(431
)


(400
)UK Gas Distribution


666



645



669





(261
)


(251
)


(218
)US Regulated


1,124



1,052



1,092





(430
)


(411
)


(445
)Other activities


216



281



275





(181
)


(179
)


(189
)3,686



3,375



3,468





(1,361
)


(1,272
)


(1,252
)Geographical areasUK


2,471



2,217



2,310





(902
)


(849
)


(789
)US


1,215



1,158



1,158





(459
)


(423
)


(463
)3,686



3,375



3,468





(1,361
)


(1,272
)


(1,252
)By asset typeProperty, plant and equipment


3,511



3,172



3,292





(1,260
)


(1,193
)


(1,182
)Non-current intangible assets


175



203



176





(101
)


(79
)


(70
)3,686



3,375



3,468





(1,361
)


(1,272
)


(1,252
) Total non-current assets other than financial instruments, deferred tax assets and pension assets located in the
UK and US were £23,344m and £19,340m respectively as at 31 March 2013 (31 March 2012: UK £21,793m, US £17,666m; 31 March 2011: UK £20,720m, US £17,003m).
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Financial Statements Notes to the consolidated financial statements Continued  2.
Operating costs  Below we have presented separately certain items included in our operating costs. These include a breakdown of payroll costs (including disclosure
of amounts paid to key management personnel) and fees paid to our auditors. Rentals under operating leases are charged to the income statement on a straight-line basis over the term of the
relevant lease.  Before exceptional items,remeasurements and strandedcost recoveries




Exceptional
items,remeasurements and strandedcost recoveries




Total2013
£m

2012
£m


2011
£m




2013
£m

2012
£m


2011
£m




2013
£m


2012
£m


2011
£mDepreciation and amortisation

1,361


1,267



1,245







5



7





1,361



1,272



1,252Payroll costs

1,441


1,389



1,460




22


82



36





1,463



1,471



1,496Purchases of electricity

1,251


1,356



1,547




(111)


89



(65
)




1,140



1,445



1,482Purchases of gas

1,384


1,518



2,102




(69)


5



(82
)




1,315



1,523



2,020Rates and property taxes

969


955



945

















969



955



945Balancing Services Incentive Scheme

805


818



581

















805



818



581Payments to other UK network owners

487


407



298

















487



407



298Other

3,017


2,348



2,210




48


54



314





3,065



2,402



2,52410,715


10,058



10,388




(110)


235



210





10,605



10,293



10,598Operating costs include:Inventory consumed


























389



360



451Operating leases


























109



97



89Research expenditure


























15



15



16(a) Payroll costs2013
£m


2012
£m


2011
£mWages and salaries (i)


























1,625



1,597



1,592Social security costs


























120



116



119Pension costs (note 22)


























209



208



208Share-based payment


























20



24



25Severance costs (excluding pension costs)

















16



35



561,990



1,980



2,000Less: payroll costs capitalised

















(527
)


(509
)


(504
)1,463



1,471



1,496  (i)
Included within wages and salaries are US other post-retirement benefit costs of £49m (2012: £66m; 2011: £11m). For further information refer to note 22.
    108National Grid plc Annual Report and Accounts 2012/13

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2. Operating costs continued (b)
Number of employees  31 March2013Number

Monthly  average  2013  Number

31 March2012Number


Monthly  average  2012  NumberUK

9,881

9,800


9,675



9,704US

15,343

15,446


15,970



16,37725,224

25,246


25,645



26,081 The vast majority of employees in the US are either directly or
indirectly employed in the transmission, distribution and generation of electricity or the distribution of gas, while those in the UK are either directly or indirectly employed in the transmission and distribution of gas or the transmission of
electricity. At 31 March 2013, there were 2,151 (2012: 2,357) employees in other operations, excluding shared services. (c) Key
management compensation  2013
£m

2012
£m

2011
£mSalaries and short-term employee benefits

8

10


10Post-retirement benefits

3

6


6Share-based payment

5

5


616

21


22 Key management compensation relates to the Board of Directors, including the Executive Directors and
Non-executive Directors for the years presented. (d) Directors emoluments Details of Directors emoluments are contained in the audited part of the Remuneration Report, which forms part of these financial
statements.
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Financial Statements  Notes to the consolidated financial statements Continued  2. Operating costs continued (e) Auditors remuneration Auditors remuneration is presented below in accordance with the requirements of the UK Companies Act 2006 and the principal accountant fees and services disclosure requirements of Item 16C of Form 20-F:  2013
£m

2012
£m


2011
£mAudit fees payable to the parent Companys auditor and its associates in respect of (i):Audit of the parent Companys individual and consolidated financial statements

1.1


1.1



1.0The auditing of accounts of any associate of the Company

6.0


5.2



4.8Other services supplied (ii)

2.7


2.3



2.19.8


8.6



7.9Total other services (iii)Tax fees (iv)Tax compliance services

0.5


0.5



0.5Tax advisory services

0.3


0.2



0.4All other fees (v)Other assurance services

0.1


0.3



0.4Services relating to corporate finance transactions not covered above

0.3


0.2



0.4Other non-audit services not covered above

1.1


2.6



1.02.3


3.8



2.7Total auditors remuneration

12.1


12.4



10.6  (i)
Audit fees in each year represent fees for the audit of the Companys financial statements and regulatory reporting for the years ended 31 March 2013, 2012 and 2011, and the review of
interim financial statements for the six month periods ended 30 September 2012, 2011 and 2010 respectively.  (ii)
Other services supplied represent fees payable for services in relation to other statutory filings or engagements that are required to be carried out by the auditors. In particular, this includes
fees for reports under section 404 of the US Public Company Accounting Reform and Investor Protection Act of 2002 (Sarbanes-Oxley) and audit reports on regulatory returns.  (iii)
There were no audit related fees as described in Item 16C(b) of Form 20-F.  (iv)
Tax fees include amounts charged for tax compliance, tax advice and tax planning. Total tax fees for the year ended 31 March 2013 were £0.8m (2012: £0.7m; 2011: £0.9m).  (v)
All other fees include amounts relating to assurance provided on transformation initiatives and sundry services, all of which have been subject to approval by the Audit Committee. Total other fees
for the year ended 31 March 2013 were £1.5m (2012: £3.1m; 2011: £1.8m). In addition, fees of
£0.1m were incurred in 2013 in relation to the audits of the pension schemes of the Company (2012: £0.1m; 2011: £0.1m). Subject to the Companys Articles of Association and the Companies Act 2006, the Audit Committee is solely and directly responsible for the approval of the appointment, reappointment, compensation and oversight of the
Companys independent auditors. It is our policy that the Audit Committee must approve in advance all non-audit work to be performed by the independent auditors to ensure that the service will not compromise auditor independence. Certain
services are prohibited from being performed by the external auditors under the Sarbanes-Oxley Act 2002.
    110National Grid plc Annual Report and Accounts 2012/13

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3.
Exceptional items, remeasurements and stranded cost recoveries  To monitor our financial performance, we use a profit measure that excludes certain income and expenses. We call that measure business
performance. We exclude items from business performance because we think these items are individually important to understanding our financial performance and, if included, could distort understanding of the performance for the year and the
comparability between periods. This note analyses these items, which are included in our result for the year but are excluded from business performance. Our financial performance is analysed into two components: business performance, which excludes exceptional items,
remeasurements and stranded cost recoveries; and exceptional items, remeasurements and stranded cost recoveries. Business performance is used by management to monitor financial performance as it is considered that it improves the comparability of
our reported financial performance from year to year. Business performance subtotals are presented on the face of the income statement or in the notes to the financial statements. Items of income or expense that are considered by management for designation as exceptional items include such items as significant
restructurings, write-downs or impairments of non-current assets, significant changes in environmental or decommissioning provisions, integration of acquired businesses, gains or losses on disposals of businesses or investments and debt redemption
costs as a consequence of transactions such as significant disposals or issues of equity. Costs arising from restructuring programmes
include redundancy costs. Redundancy costs are charged to the income statement in the year in which a commitment is made to incur the costs and the main features of the restructuring plan have been announced to affected employees. Remeasurements comprise gains or losses recorded in the income statement arising from changes in the fair value of commodity contracts and of
derivative financial instruments to the extent that hedge accounting is not achieved or is not effective. These fair values increase or decrease because of changes in commodity and financial indices and prices over which we have no control. Stranded cost recoveries represent the recovery, through charges to electricity customers in upstate New York and New England, of
historical generation-related costs, related to generation assets that are no longer owned by National Grid. Such costs have been recovered from customers as permitted by regulatory agreements, with substantially all having been recovered by
31 March 2012.
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Financial Statements Notes to the consolidated financial statements Continued  3. Exceptional items,
remeasurements and stranded cost recoveries continued  2013
£m


2012
£m


2011
£mIncluded within operating profit:Exceptional items:Restructuring
costs(1)




(87
)


(101
)


(89
)Environmental charges(2)








(55
)


(128
)Net gain on disposal of businesses(3)




3



97



15Impairment charges and related costs(4)








(64
)


(133
)Other(5)








1



(15
)(84
)


(122
)


(350
)Remeasurements  commodity contracts(6)




180



(94
)


147Stranded cost
recoveries(7)




14



260



348110



44



145Included within finance income:Exceptional items:Interest credit on tax settlement(8)












43Included within finance costs:Exceptional items:Debt redemption
costs(9)












(73
)Remeasurements:Net gains/(losses) on derivative financial
instruments(10)




68



(70
)


3668



(70
)


(37
)Total included within profit before tax




178



(26
)


151Included within taxation:Exceptional credits arising on items not included in profit before tax:Deferred tax credit arising on the reduction in the UK corporation tax rate(11)




128



242



226Other(8)












59Tax on exceptional items




31



54



79Tax on remeasurements(6,10)




(92
)


42



36Tax on stranded cost recoveries




(5
)


(104
)


(139
)62



234



261Total exceptional items, remeasurements and stranded cost recoveries after
tax




240



208



412Analysis of total exceptional items, remeasurements and stranded cost recoveries after
tax: Exceptional items after tax




75



174



(16
)Remeasurements after tax




156



(122
)


219Stranded cost recoveries after tax




9



156



209Total




240



208



412  (1)
Restructuring costs for the year include: costs related to the restructuring of our UK operations of £66m in preparedness for delivering RIIO; costs for transformation-related initiatives in
the UK and US of £31m; and a credit of £10m for the release of restructuring provisions in the UK recognised in prior years.  For the years ended 31 March 2012 and 31 March 2011, restructuring costs included: costs for the restructuring of our US operations of £58m and £10m respectively which
included severance costs and pension and other post-retirement curtailment gains and losses; costs for transformation-related initiatives of £54m and £103m respectively; credits of £11m and £39m respectively for the release
of restructuring provisions in the UK recognised in prior years; and in 2011 a charge of £15m related to the integration of KeySpan.  (2)
For the years ended 31 March 2012 and 31 March 2011, environmental charges included £55m and £58m respectively related to US specific exposures and £70m in 2011 related
to UK specific exposures. Costs incurred with respect to US environmental provisions are substantially recoverable from customers.
    112National Grid plc Annual Report and Accounts 2012/13

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3.
Exceptional items, remeasurements and stranded cost recoveries continued  (3)
During the year, we recognised a gain of £3m on the disposal of our EnergyNorth gas business and Granite State electricity business in New Hampshire. During the year ended 31 March 2012,
we sold two subsidiaries resulting in a gain on disposal of £72m. We also recognised gains of £25m in relation to disposals of businesses in prior years, representing the release of various unutilised provisions. During the year ended
31 March 2011, we sold three subsidiaries and an associate resulting in a gain of £15m.  (4)
Impairment charges and related costs for the year ended 31 March 2012 of £64m represented an impairment of intangibles (originally recognised on the acquisition of KeySpan) related to
our LIPA management services agreement contract, following the announcement on 15 December 2011 that the agreement would not be renewed after 31 December 2013. During the year ended 31 March 2011, impairment charges and related costs
included a charge of £49m related to an investment in a joint venture; an impairment charge of £34m against the goodwill related to our US companies in New Hampshire; and a charge of £50m related to our US generation assets for
impairment and associated decommissioning.  (5)
Other exceptional charges for the years ended 31 March 2012 and 2011 included an amortisation charge of £5m and £7m respectively in relation to acquisition-related intangibles. For
the year ended 31 March 2012, other exceptional charges also included a release of £6m of unutilised provisions in our metering business, originally recognised during the year ended 31 March 2010. The charge for the year ended
31 March 2011 included a penalty of £8m levied by Ofgem on our UK Gas Distribution business.  (6)
Remeasurements  commodity contracts represent mark-to-market movements on certain physical and financial commodity contract obligations in the US. These contracts primarily relate to the
forward purchase of energy for supply to customers, or to the economic hedging thereof, that are required to be measured at fair value and that do not qualify for hedge accounting. Under the existing rate plans in the US, commodity costs are
recoverable from customers although the timing of recovery may differ from the pattern of costs incurred.  (7)
Stranded cost recoveries of £14m substantially represent the release of an unutilised provision recognised in a prior period. For the years ended 31 March 2012 and 2011, stranded cost
recoveries on a pre-tax basis consisted of revenue of £279m and £355m offset by operating costs of £19m and £7m respectively. This represented the recovery of some of our historical investments in generating plants that were
divested as part of the restructuring and wholesale power deregulation process in New England and New York during the 1990s. The recovery of these stranded costs was substantially completed at 31 March 2012.   (8)
During the year ended 31 March 2011, we reached agreement with the US tax authorities on the settlement of pre-acquisition tax liabilities that resulted in the repayment of tax and interest
accruing.  (9)
Debt redemption costs in the year ended 31 March 2011 represent costs arising from our debt repurchase programme following the rights issue on 14 June 2010.  (10)
Remeasurements  net gains/(losses) on derivative financial instruments comprise gains/(losses) arising on derivative financial instruments reported in the income statement. These exclude
gains and losses for which hedge accounting has been effective, which have been recognised directly in other comprehensive income or which are offset by adjustments to the carrying value of debt. The tax charge in the year includes a credit of
£1m (2012: £1m; 2011: £104m) in respect of prior years.  (11)
The exceptional tax credit arises from a reduction in the UK corporation tax rate from 24% to 23% included and enacted in the Finance Act 2012 and applicable from 1 April 2013. Other UK tax
legislation also reduced the UK corporation tax rate in the prior periods (2012: from 26% to 24%; 2011: from 28% to 26%). These reductions have resulted in a decrease in deferred tax liabilities.
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Financial Statements Notes to the consolidated financial statements Continued  4.
Finance income and costs  This note details the interest income generated on our financial assets and the interest expense incurred on financial liabilities. It also
includes the expected return on pension assets, which is offset by the interest payable on pension obligations. In reporting business performance, we adjust net financing costs to exclude any net gains or losses on derivative financial instruments
included in remeasurements.  2013
£m


2012
£m


2011
£mFinance incomeExpected return on pension and other post-retirement benefit plan assets


1,222



1,273



1,256Interest income on financial instruments:Bank deposits and other financial assets


20



19



22Gains on disposal of available-for-sale investments


10



9



3Finance income before exceptional items


1,252



1,301



1,281Exceptional itemsExceptional interest credit on tax settlement










43Finance income


1,252



1,301



1,324Finance costsInterest on pension and other post-retirement benefit plan obligations


(1,153
)


(1,203
)


(1,231)Interest expense on financial liabilities held at amortised cost:Bank loans and overdrafts


(65
)


(84
)


(85)Other borrowings


(1,052
)


(1,105
)


(1,184)Derivatives


51



122



84Unwinding of discounts on provisions


(75
)


(72
)


(128)Less: interest capitalised (i)


122



124



129Finance costs before exceptional items and remeasurements


(2,172
)


(2,218
)


(2,415)Exceptional itemsExceptional debt redemption costs










(73)RemeasurementsNet gains/(losses) on derivative financial instruments included in remeasurements (ii):Ineffectiveness on derivatives designated as:Fair value hedges (iii)


17



9



40Cash flow hedges


(7
)


14



9Net investment hedges


(26
)


(15
)


7Net investment hedges  undesignated forward rate risk


26



39



(16)Derivatives not designated as hedges or ineligible for hedge accounting


58



(117
)


(4)68



(70
)


36Exceptional items and remeasurements included within finance costs


68



(70
)


(37)Finance costs


(2,104
)


(2,288
)


(2,452)Net finance costs


(852
)


(987
)


(1,128)  (i)
Interest on funding attributable to assets in the course of construction was capitalised during the year at a rate of 4.4% (2012: 5.2%; 2011: 5.3%).  (ii)
Includes a net foreign exchange loss on financing activities of £32m (2012: £280m gain; 2011: £173m gain) offset by foreign exchange gains and losses on derivative financial
instruments measured at fair value.  (iii)
Includes a net gain on instruments designated as fair value hedges of £67m (2012: £233m; 2011: £86m) offset by a net loss of £50m (2012: £224m; 2011: £46m)
arising from fair value adjustments to the carrying value of debt.
    114National Grid plc Annual Report and Accounts 2012/13

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5. Taxation  Tax is payable in the territories where we operate, mainly the UK and the US. This note gives further details of the tax charge and tax
liabilities, including current and deferred tax. The current tax charge is the tax payable on this years taxable profits. Deferred tax is an accounting adjustment to provide for tax that is expected to arise in the future due to differences in
accounting and tax bases. The tax charge for the period is recognised in the income statement, the statement of comprehensive income or
directly in equity, according to the accounting treatment of the related transaction. The tax charge comprises both current and deferred tax. Current tax assets and liabilities are measured at the amounts expected to be recovered from or paid to the taxation authorities. The tax rates and tax laws used to compute the amounts are those that have been enacted or
substantively enacted by the reporting date. The calculation of the Groups total tax charge involves a degree of estimation and
judgement, and management periodically evaluates positions taken in tax returns with respect to situations in which applicable tax regulation is subject to interpretation and establishes provisions where appropriate on the basis of amounts expected
to be paid to the tax authorities. Deferred tax is provided for using the balance sheet liability method and is recognised on
temporary differences between the carrying amount of assets and liabilities in the financial statements and the corresponding tax bases used in the computation of taxable profit. Deferred tax liabilities are generally recognised on all taxable temporary differences and deferred tax assets are recognised to the extent that
it is probable that taxable profits will be available against which deductible temporary differences can be utilised. However, deferred tax assets and liabilities are not recognised if the temporary differences arise from the initial recognition of
goodwill or from the initial recognition of other assets and liabilities in a transaction (other than a business combination) that affects neither the accounting nor taxable profit or loss. Deferred tax liabilities are recognised on taxable temporary differences arising on investments in subsidiaries and jointly controlled entities
except where the Company is able to control the reversal of the temporary difference and it is probable that the temporary difference will not reverse in the foreseeable future. Deferred tax is calculated at the tax rates that are expected to apply in the period when the liability is settled or the asset is realised, based
on the tax rates and tax laws that have been enacted or substantively enacted by the reporting date. The carrying amount of deferred
tax assets is reviewed at each reporting date and reduced to the extent that it is no longer probable that sufficient taxable profits will be available to allow all or part of the deferred tax asset to be recovered. Unrecognised deferred tax assets
are reassessed at each reporting date and are recognised to the extent that it has become probable that future taxable profits will allow the deferred tax asset to be recovered. Deferred tax assets and liabilities are offset when there is a legally enforceable right to set off current tax assets against current tax
liabilities and when they relate to income taxes levied by the same taxation authority and the Company and its subsidiaries intend to settle their current tax assets and liabilities on a net basis.
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Financial Statements Notes to the consolidated financial statements Continued  5. Taxation continued Tax charged/(credited) to the income statement  2013
£m


2012
£m


2011
£mTax before exceptional items, remeasurements and stranded cost recoveries


686



755



722Exceptional tax on items not included in profit before tax (note 3)


(128
)


(242
)


(285)Tax on other exceptional items, remeasurements and stranded cost recoveries


66



8



24Tax on total exceptional items, remeasurements and stranded cost recoveries (note 3)


(62
)


(234
)


(261)Total tax charge


624



521



461Taxation as a percentage of profit before tax2013%


2012%


2011  %Before exceptional items, remeasurements and stranded cost recoveries


25.0



29.2



29.2After exceptional items, remeasurements and stranded cost recoveries


21.4



20.4



17.6The tax charge for the year can be analysed as
follows:2013
£m


2012
£m


2011
£mCurrent taxUK corporation tax at 24% (2012: 26%; 2011: 28%)


306



186



168UK corporation tax adjustment in respect of prior years


(17
)


(5
)


(161)289



181



7Overseas corporation tax


50



98



105Overseas corporation tax adjustment in respect of prior years


(222
)


(144
)


(2)(172
)


(46
)


103Total current tax


117



135



110Deferred taxUK deferred tax


60



12



53UK deferred tax adjustment in respect of prior years


(17
)


(18
)


(43)43



(6
)


10Overseas deferred tax


325



225



393Overseas deferred tax adjustment in respect of prior years


139



167



(52)464



392



341Total deferred tax


507



386



351Total tax charge


624



521



461 Adjustments in respect of prior years include the following amounts that relate to exceptional items,
remeasurements and stranded cost recoveries: £nil for corporation tax (2012: £nil; 2011: £207m credit) and a £1m deferred tax credit (2012: £1m credit; 2011: £44m charge).
    116National Grid plc Annual Report and Accounts 2012/13

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5. Taxation continued Tax
(credited)/charged to other comprehensive income and equity  2013
£m


2012
£m


2011
£mCorporation taxShare-based payment


1



(3
)


(1)Deferred taxShare of other comprehensive income of joint ventures and associates










(2)Available-for-sale investments


2



2



1Cash flow hedges


13



(2
)


2Share-based payment


1







(4)Actuarial (losses)/gains


(249
)


(403
)


181(232
)


(406
)


177Total tax recognised in the statement of comprehensive income
Total tax relating to share-based payment recognised directly in equity


(2342
)


(403(3
))


182(5)(232
)


(406
)


177 The tax charge for the year after exceptional items, remeasurements and stranded cost recoveries is lower (2012:
lower; 2011: lower) than the standard rate of corporation tax in the UK of 24% (2012: 26%; 2011: 28%):  Beforeexceptionalitems,remeasurementsand strandedcost recoveries
2013 £m


After
exceptionalitems,remeasurementsand strandedcost recoveries2013
£m


Beforeexceptionalitems,remeasurementsand strandedcost recoveries2012
£m


After
exceptionalitems,remeasurementsand strandedcost recoveries2012
£m


Beforeexceptionalitems,remeasurementsand strandedcost recoveries2011
£m


After
exceptionalitems,remeasurementsand strandedcost recoveries2011
£mProfit before taxBefore exceptional items, remeasurements and stranded cost recoveries


2,742



2,742



2,585



2,585



2,473



2,473Exceptional items, remeasurements and stranded cost recoveries






178







(26
)






151Profit before tax


2,742



2,920



2,585



2,559



2,473



2,624Profit before tax multiplied by UK corporation tax rate of 24% (2012: 26%; 2011: 28%)


658



701



672



665



692



735Effects of:Adjustments in respect of prior years


(116
)


(117
)


1







(95
)


(258
)Expenses not deductible for tax purposes


37



169



36



55



42



204Non-taxable income


(24
)


(152
)


(19
)


(30
)


5



(136
)Adjustment in respect of foreign tax rates


133



157



75



75



74



120Impact of share-based payment


2



2



1



1



1



1Deferred tax impact of change in UK tax rate






(128
)






(242
)






(226
)Other


(4
)


(8
)


(11
)


(3
)


3



21Total tax


686



624



755



521



722



461%



%



%



%



%



%Effective tax rate


25.0



21.4



29.2



20.4



29.2



17.6 Factors that may affect future tax charges A reduction in the UK corporation tax rate to 21% from 1 April 2014 was announced in the Autumn Statement and a further reduction to 20% from
April 2015 was announced in the 2013 UK Budget Report. These reductions have not been substantively enacted and have not been reflected in these financial statements. The Groups tax charge will reflect these reductions in the UK corporation
tax rate once the changes have been enacted.
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Financial Statements Notes to the consolidated financial statements Continued  5. Taxation continued Taxation included within the statement of financial position The following are the major deferred tax assets and liabilities recognised, and the movements thereon, during the current and prior reporting
periods:  Deferred tax (assets)/liabilities

Accelerated
tax depreciation £m


Share-
based payment £m


Pensions
and other post-
retirement benefits
£m


Financial
instruments £m


Other net temporary differences £m


Total
£mDeferred tax assets at 31 March 2011


(2)



(18)



(882)



(60)



(706)



(1,668)Deferred tax liabilities at 31 March 2011


5,186







111



6



131



5,434At 1 April 2011


5,184



(18)



(771)



(54)



(575)



3,766Exchange adjustments


10







(3)



(1)



(4)



2Charged/(credited) to income statement


307







128



(34)



(20)



381Credited to other comprehensive income










(403)











(403)Disposals


(28)



















(28)Reclassified as held for sale


10







1







14



25Other










3







(8)



(5)At 31 March 2012


5,483



(18)



(1,045)



(89)



(593)



3,738Deferred tax assets at 31 March 2012


(1)



(18)



(1,173)



(98)



(702)



(1,992)Deferred tax liabilities at 31 March 2012


5,484







128



9



109



5,730At 1 April 2012


5,483



(18)



(1,045)



(89)



(593)



3,738Exchange adjustments


149







(47)



(1)



(32)



69Charged/(credited) to income statement


329



2



132



68



(23)



508Charged/(credited) to other comprehensive income and equity






1



(249)



15







(233)Other


















(6)



(6)At 31 March 2013


5,961



(15)



(1,209)



(7)



(654)



4,076Deferred tax assets at 31 March 2013


(2)



(15)



(1,363)



(16)



(777)



(2,173)Deferred tax liabilities at 31 March 2013


5,963







154



9



123



6,2495,961



(15)



(1,209)



(7)



(654)



4,076 Deferred tax assets and liabilities are only offset where there is a legally enforceable right of offset and there
is an intention to settle the balances net. The deferred tax balances (after offset) for statement of financial position purposes consist solely of deferred tax liabilities of £4,076m (2012: £3,738m). At the reporting date there were no material current deferred tax assets or liabilities (2012: £nil). Deferred tax assets in respect of capital losses, trading losses and non-trade deficits have not been recognised as their future recovery is
uncertain or not currently anticipated. The deferred tax assets not recognised are as follows:  2013
£m


2012
£mCapital losses


323



353Non-trade deficits


1



2Trading losses


11



7 The capital losses and non-trade deficits that arise in the UK are available to carry forward indefinitely.
However, the capital losses can only be offset against specific types of future capital gains and non-trade deficits against specific future non-trade profits. The capital losses that arise in the US can only be offset against future capital gains
but will expire in the year ended 31 March 2018 if they remain unused. The trading losses arising in the UK are available to carry forward indefinitely and the trading losses arising in the US have a 20-year carry forward time limit. The aggregate amount of temporary differences associated with the unremitted earnings of overseas subsidiaries and joint ventures for
which deferred tax liabilities have not been recognised at the reporting date is approximately £1,817m (2012: £1,729m). No liability is recognised in respect of the differences because the Company and its subsidiaries are in a position
to control the timing of the reversal of the temporary differences and it is probable that such differences will not reverse in the foreseeable future. In addition, as a result of a change in UK tax legislation, which largely exempts overseas
dividends received on or after 1 July 2009 from UK tax, the temporary differences are unlikely to lead to additional tax.
    118National Grid plc Annual Report and Accounts 2012/13

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6. Earnings per share  Earnings per share (EPS) is the amount of post-tax profit attributable to each share. Basic EPS is calculated on profit for the year attributable
to equity shareholders divided by the weighted average number of shares in issue during the year. Diluted EPS shows what the impact would be if all outstanding share options were exercised and treated as ordinary shares at year end. Adjusted earnings per share, excluding exceptional items, remeasurements and stranded cost recoveries, are
provided to reflect the business performance subtotals used by the Company. For further details of exceptional items, remeasurements and stranded cost recoveries, see note 3. (a) Basic earnings per share  Earnings
2013 £m


Earningsper share2013pence


Earnings
2012 £m


Earnings per share 2012* pence


Earnings
2011 £m


Earnings  per share  2011*  penceAdjusted earnings


2,055



56.1



1,828



50.0



1,747



49.6Exceptional items after tax


75



2.0



174



4.7



(16)



(0.5)Remeasurements after tax


156



4.3



(122)



(3.3)



219



6.2Stranded cost recoveries after tax


9



0.2



156



4.2



209



5.9Earnings


2,295



62.6



2,036



55.6



2,159



61.22013millions





2012 millions





2011  millionsWeighted average number of shares  basic*






3,664







3,659







3,525 *Comparative amounts have been restated to reflect the impact of additional shares issued as scrip dividends (b) Diluted earnings per share  Earnings
2013 £m


Earningsper share2013pence


Earnings
2012 £m


Earnings per share 2012* pence


Earnings
2011 £m


Earnings  per share  2011*  penceAdjusted earnings


2,055



55.8



1,828



49.7



1,747



49.3Exceptional items after tax


75



2.0



174



4.7



(16)



(0.5)Remeasurements after tax


156



4.3



(122)



(3.2)



219



6.2Stranded cost recoveries after tax


9



0.2



156



4.2



209



5.9Earnings


2,295



62.3



2,036



55.4



2,159



60.92013millions





2012millions





2011  millionsWeighted average number of shares  diluted*






3,682







3,678







3,544*Comparative amounts have been restated to reflect the impact of additional shares issued as scrip
dividends(c) Reconciliation of basic to diluted average
number of shares2013millions





2012millions





2011  millionsWeighted average number of ordinary shares  basic






3,664







3,659







3,525Effect of dilutive potential ordinary shares  employee share plans






18







19







19Weighted average number of ordinary shares  diluted






3,682







3,678







3,544
 LOGO
   www.nationalgrid.com

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Financial Statements Notes to the consolidated financial statements Continued  7.
Dividends  Dividends represents the return of profits to shareholders. Dividends are paid as an amount per ordinary share held. We retain part of the profits
generated in the year to meet future growth plans and pay out the remainder in accordance with our dividend policy. Interim dividends are recognised when they become payable to the Companys shareholders. Final dividends are
recognised when they are approved by shareholders. The following table shows the actual dividends paid to equity shareholders:  2013




2012




2011Penceper share


Total
£m


Settledvia scrip£m




Penceper share


Total
£m


Settledvia scrip£m




Penceper share


Total
£m


Settledvia scrip£mInterim  year ended 31 March 2013


14.49



527



187



























Final  year ended 31 March 2012


25.35



906



436



























Interim  year ended 31 March 2012
















13.93



497



34













Final  year ended 31 March 2011
















23.47



822



279













Interim  year ended 31 March 2011






























12.90



451



65Final  year ended 31 March 2010






























24.84



613



14139.84



1,433



623





37.40



1,319



313





37.74



1,064



206 The Directors are proposing a final dividend for the year ended 31 March 2013 of 26.36p per share that
will absorb approximately £967m of shareholders equity (assuming all amounts are settled in cash). It will be paid on 21 August 2013 to shareholders who are on the register of members at 7 June 2013 and a scrip dividend will be
offered as an alternative, subject to shareholders approval at the Annual General Meeting. 8.
Goodwill  Goodwill represents the excess of what we paid to acquire businesses over the fair value of their net assets at the acquisition date. We assess
whether goodwill is recoverable each year by performing an impairment review. Goodwill is recognised as an asset and is not amortised, but is tested for impairment annually, or more frequently
if events or changes in circumstances indicate a potential impairment. Any impairment is recognised immediately in the income statement and is not subsequently reversed. Goodwill and fair value adjustments arising on the acquisition of a foreign entity are treated as assets and liabilities of the foreign entity and
translated at the closing exchange rate. Impairment Goodwill is allocated to cash-generating units and this allocation is made to those cash-generating units that are expected to benefit from the
business combination in which the goodwill arose. Impairments of goodwill are calculated as the difference between the carrying value
of the goodwill and the estimated recoverable amount of the cash-generating unit to which that goodwill has been allocated. Recoverable amount is defined as the higher of fair value less costs to sell and estimated value-in-use at the date the
impairment review is undertaken. Value-in-use represents the present value of expected future cash flows, discounted using a pre-tax
discount rate that reflects current market assessments of the time value of money and the risks specific to the asset for which the estimates of future cash flows have not been adjusted. Impairments are recognised in the income statement and are disclosed separately.
    120National Grid plc Annual Report and Accounts 2012/13

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8. Goodwill continued  Total
£mCost at 1 April 2011


4,776Exchange adjustments


22Reclassified as held for sale (i)


(22)Cost at 31 March 2012


4,776Exchange adjustments


252Cost at 31 March 2013


5,028Net book value at 31 March 2013


5,028Net book value at 31 March 2012


4,776  (i)
Relates to our New Hampshire businesses which were classified as held for sale at 31 March 2012 (see notes 3 and 18). The amounts disclosed above as at 31 March 2013 include balances relating to the following cash-generating units: New York £2,898m
(2012: £2,752m); Massachusetts £1,082m (2012: £1,028m); Rhode Island £403m (2012: £383m); and Federal £645m (2012: £613m). Goodwill is reviewed annually for impairment and the recoverability of goodwill at 31 March 2013 has been assessed by comparing the carrying
amount of our operations described above (our cash-generating units) with the expected recoverable amount on a value-in-use basis. In each assessment, the value-in-use has been calculated based on five year plan projections that incorporate our best
estimates of future cash flows, customer rates, costs, future prices and growth. Such projections reflect our current regulatory rate plans taking into account regulatory arrangements to allow for future rate plan filings and recovery of investment. Our plans have proved to be reliable guides in the past and the Directors believe the estimates are appropriate. The future growth rate used to extrapolate projections beyond five years has been maintained at 2.25% (2012: 2.25%). The growth rate has been
determined having regard to data on projected growth in US real gross domestic product. Based on our business place in the underlying US economy, it is appropriate for the terminal growth rate to be based upon the overall growth in real GDP
and, given the nature of our operations, to extend over a long period of time. Cash flow projections have been discounted to reflect the time value of money, using an effective pre-tax discount rate of 9% (2012: 9%). The discount rate represents the
estimated weighted average cost of capital of these operations. While it is possible that a key assumption in the calculation could
change, the Directors believe that no reasonably foreseeable change would result in an impairment of goodwill, in view of the long-term nature of the key assumptions and the margin by which the estimated fair value exceeds the carrying amount. 9. Other intangible assets  Other intangible assets includes software and acquisition-related assets (such as brand names and customer relationships), which are written down
(amortised) over the length of period we expect to receive a benefit from the asset. Identifiable intangible assets are recorded at cost less accumulated amortisation and any provision for
impairment. Other intangible assets are tested for impairment only if there is an indication that the carrying value of the assets may
have been impaired. Impairments of assets are calculated as the difference between the carrying value of the asset and the recoverable
amount, if lower. Where such an asset does not generate cash flows that are independent from other assets, the recoverable amount of the cash-generating unit to which that asset belongs is estimated. Impairments are recognised in the income statement and are disclosed separately. Any assets which suffered impairment in a previous period are reviewed for possible reversal of the impairment at each reporting date. Internally generated intangible assets, such as software, are recognised only if: an asset is created that can be identified; it is probable that
the asset created will generate future economic benefits; and the development cost of the asset can be measured reliably. Where no internally generated intangible asset can be recognised, development expenditure is recorded as an expense in the
period in which it is incurred. On a business combination, as well as recording separable intangible assets possessed by the acquired
entity at their fair value, identifiable intangible assets that arise from contractual or other legal rights are also included in the statement of financial position at their fair value. Acquisition-related intangible assets principally comprise
customer relationships.
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Financial Statements Notes to the consolidated financial statements Continued  9. Other intangible assets
continued Other intangible assets are amortised on a straight-line basis over their estimated useful economic lives. Amortisation
periods for categories of intangible assets are:  Amortisation periods

YearsSoftware


3 to 10Acquisition-related intangibles


10 to 25Other  licences and other intangibles


3 to 5  Software
£m


Acquisition-
related £m


Other
£m


Total
£mCost at 1 April 2011


800



115



4



919Exchange adjustments


1



1







2Additions


203











203Disposals


(105)







(4)



(109)Cost at 31 March 2012


899



116







1,015Exchange adjustments


20



6







26Additions


175











175Disposals


(26)











(26)Reclassifications (i)


(37)











(37)Cost at 31 March 2013


1,031



122







1,153Accumulated amortisation at 1 April 2011


(383)



(31)



(4)



(418)Exchange adjustments


(1)











(1)Amortisation charge for the year


(74)



(5)







(79)Impairment charge for the year (note 3)






(64)







(64)Disposals


89







4



93Reclassifications between categories


16



(16)







Accumulated amortisation at 31 March 2012


(353)



(116)







(469)Exchange adjustments


(6)



(6)







(12)Amortisation charge for the year


(101)











(101)Disposals


9











9Reclassifications (i)


9











9Accumulated amortisation at 31 March 2013


(442)



(122)







(564)Net book value at 31 March 2013


589











589Net book value at 31 March 2012


546











546  (i)
Reclassifications represents amounts transferred to property, plant and equipment (see note 10). Following the recognition of an impairment charge in relation to acquisition-related intangibles, the net book value has been fully written off.
    122National Grid plc Annual Report and Accounts 2012/13

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10. Property, plant and equipment  The following note shows the physical assets controlled by us. The cost of these assets primarily represents the amount initially paid for them. A
depreciation expense is charged to the income statement to reflect annual wear and tear and the reduced value of the asset over time. Depreciation is calculated by estimating the number of years we expect the asset to be used (useful economic life)
and charging the cost of the asset to the income statement equally over this period.  Our strategy in action 
We operate an energy networks business and therefore have a significant physical asset base. We continue to invest in our networks to maintain
reliability, create new customer connections and ensure our networks have the flexibility and resilience necessary to meet future challenges. Our business plan envisages these additional investments will be funded through a mixture of cash generated
from operations and the issue of new debt. Property, plant and equipment is recorded at cost, less accumulated depreciation and any impairment losses. Cost includes the purchase price of the asset, any payroll and finance costs incurred which are directly attributable to the
construction of property, plant and equipment as well as the cost of any associated asset retirement obligations. Property, plant and
equipment includes assets in which the Companys interest comprises legally protected statutory or contractual rights of use. Additions represent the purchase or construction of new assets, including capital expenditure for safety and
environmental assets, and extensions to, enhancements to, or replacement of existing assets. Contributions received prior to
1 July 2009 towards the cost of property, plant and equipment are included in trade and other payables as deferred income and credited on a straight-line basis to the income statement over the estimated useful economic lives of the assets to
which they relate. Contributions received post 1 July 2009 are recognised in revenue immediately, except where the contributions
are consideration for a future service, in which case they are recognised initially as deferred income and revenue is subsequently recognised over the period in which the service is provided. No depreciation is provided on freehold land or assets in the course of construction. Other items of property, plant and equipment are depreciated, on a straight-line basis, at rates estimated to write off their book values over
their estimated useful economic lives. In assessing estimated useful economic lives, consideration is given to any contractual arrangements and operational requirements relating to particular assets. The assessments of estimated useful economic
lives and residual values of assets are performed annually. Unless otherwise determined by operational requirements, the depreciation periods for the principal categories of property, plant and equipment are, in general, as shown in the table below:  Depreciation periods

YearsFreehold and leasehold buildings


up to 65Plant and machineryElectricity transmission plant


15 to 60Electricity distribution plant


15 to 60Electricity generation plant


20 to 40Interconnector plant


15 to 60Gas plant  mains, services and regulating equipment


30 to 100Gas plant  storage


15 to 21Gas plant  meters


10 to 33Motor vehicles and office equipment


up to 10 Gains and losses on disposals are determined by comparing the proceeds with the carrying amount and are,
depending on their magnitude, recognised as an exceptional item within operating profit in the income statement. Items within
property, plant and equipment are tested for impairment only if there is some indication that the carrying value of the assets may have been impaired. Impairments of assets are calculated as the difference between the carrying value of the asset and the recoverable amount, if lower. Where such an asset does not generate cash flows that are independent from other assets, the
recoverable amount of the cash-generating unit to which that asset belongs is estimated. Material impairments are recognised in the
income statement and are disclosed separately. Any assets which suffered impairment in a previous period are reviewed for possible
reversal of the impairment at each reporting date.
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Financial Statements Notes to the consolidated financial statements Continued  10. Property, plant and equipment
continued  Land and
buildings
£m


Plant and
machinery
£m


Assets
in the course ofconstruction £m


Motor
vehicles
and office equipment £m


Total
£mCost at 1 April 2011


1,758



40,898



2,417



1,052



46,125Exchange adjustments


5



66



2







73Additions


161



757



2,170



84



3,172Disposals


(8
)


(294
)


(4
)


(612
)


(918
)Reclassified as held for sale


(3
)


11







(3
)


5Reclassifications between categories


100



1,261



(1,610
)


249



Cost at 31 March 2012


2,013



42,699



2,975



770



48,457Exchange adjustments


55



803



45



13



916Additions


141



704



2,584



82



3,511Disposals


(24
)


(311
)


(2
)


(130
)


(467
)Reclassifications (i)


140



1,471



(1,642
)


68



37Cost at 31 March 2013


2,325



45,366



3,960



803



52,454Accumulated depreciation at 1 April 2011


(409
)


(13,100
)


(2
)


(658
)


(14,169
)Exchange adjustments


(1
)


(18
)










(19
)Depreciation charge for the year (ii)


(54
)


(1,056
)






(102
)


(1,212
)Impairment charge for the year (iii)






(15
)










(15
)Disposals


8



257







374



639Reclassified as held for sale






18







2



20Reclassifications between categories


20



110







(130
)


Accumulated depreciation at 31 March 2012


(436
)


(13,804
)


(2
)


(514
)


(14,756
)Exchange adjustments


(11
)


(216
)






(9
)


(236
)Depreciation charge for the year (ii)


(75
)


(1,085
)






(121
)


(1,281
)Disposals


23



299



2



96



420Reclassifications (i)














(9
)


(9
)Accumulated depreciation at 31 March 2013


(499
)


(14,806
)






(557
)


(15,862
)Net book value at 31 March 2013


1,826



30,560



3,960



246



36,592Net book value at 31 March
2012


1,577



28,895



2,973



256



33,701(i)    Represents amounts transferred between categories and from other intangible
assets (see note 9). 
(ii)   Includes amounts in respect of capitalised depreciation of £21m (2012:
£19m). 
(iii)  Relates to impairment of LNG assets.2013
£m


2012
£mInformation in relation to property, plant and
equipmentCapitalised interest included within cost



1,275



1,148Net book value of assets held under finance leases (all relating to motor vehicles and office
equipment)



188



207Additions to assets held under finance leases (all relating to motor vehicles and office
equipment)



48



36Contributions to cost of property, plant and equipment included within:Trade and other payables



43



43Non-current liabilities



1,492



1,467
    124National Grid plc Annual Report and Accounts 2012/13

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11. Other non-current assets  Other non-current assets includes assets that do not fall into any other non-current asset category (such as goodwill or property, plant and
equipment) and the benefit to be received from the asset is not due to be received until after 31 March 2014.  2013
£m


2012
£mCommodity contract assets


47



36Other receivables


51



54Prepayments


6



5104



95 There is no material difference between the fair value and the carrying value of other non-current assets. 12. Financial and other investments Financial and other investments includes two main categories. Assets that are
classified as available-for-sale typically represent investments in short-term money funds and quoted investments in equities or bonds of other companies. The second category is loans and receivables which includes cash balances that cannot be
readily used in operations, principally collateral pledged for certain borrowings and restricted cash balances relating to our UK pension schemes. Financial assets, liabilities and equity instruments are classified according to the substance of the contractual
arrangements entered into, and recognised on trade date. Available-for-sale financial assets are non-derivatives that are either designated in this category or not classified in any other categories. Loans receivable and other receivables are initially recognised at fair value and subsequently held at amortised cost using the effective interest
method. Interest income, together with gains and losses when the loans and receivables are derecognised or impaired, are recognised in the income statement. Available-for-sale financial investments are recognised at fair value plus directly related incremental transaction costs, and are subsequently
carried at fair value in the statement of financial position. Changes in the fair value of available-for-sale investments are recognised directly in equity, until the investment is disposed of or is determined to be impaired. At this time the
cumulative gain or loss previously recognised in equity is included in the income statement for the period. Investment income is recognised using the effective interest method and taken through interest income in the income statement. Subsequent to initial recognition, the fair values of financial instruments measured at fair value that are quoted in active markets are based on
bid prices for assets held and offer prices for issued liabilities. When independent prices are not available, fair values are determined by using valuation techniques that are consistent with techniques commonly used by the relevant market. The
techniques use observable market data.
 LOGO
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Financial Statements Notes to the consolidated financial statements Continued  12. Financial and other investments
continued  2013
£m


2012
£mNon-currentAvailable-for-sale investments


278



251CurrentAvailable-for-sale investments


4,441



1,675Loans and receivables


990



7165,431



2,391Total financial and other investments


5,709



2,642Financial and other investments include the following:Investments in short-term money funds


4,120



1,342Managed investments in equity and bonds (i)


453



441Bank deposits (i)


165



9Cash surrender value of life insurance policies


145



130Other investments


4



4Restricted cash balances (ii)


822



7165,709



2,642  (i)
Includes £296m (2012: £286m) of current investments which are held by insurance captives and are therefore restricted.  (ii)
Principally comprises collateral placed with counterparties with whom we have entered into a credit support annex to the ISDA Master Agreement £507m (2012: £461m), and secured bank
accounts with charges in favour of the UK pension schemes Trustees of £179m (2012: £146m). Available-for-sale investments are recorded at fair value. Due to their short maturities the carrying value of loans and receivables approximates
their fair value. The maximum exposure to credit risk at the reporting date is the fair value of the financial investments. For further information on our credit risk, refer to note 30(c). None of the financial investments are past due or impaired. 13. Investments in joint ventures and associates  Investments in joint ventures and associates represents businesses we do not control, but in which we have up to a 50% equity holding and exercise
joint control or significant influence. A joint venture is an entity established to engage in economic activity, which the Company jointly controls with
its fellow venturers. An associate is an entity which is neither a subsidiary nor a joint venture, but over which the Company has significant influence.  2013
£m


2012
£mShare of net assets at 1 April


341



356Exchange adjustments


9



(15
)Additions


14



13Share of retained profit for the year


18



7Dividends received


(21
)


(26
)Other movements


10



6Share of net assets at
31 March


371



341 A list of principal joint ventures and associates is provided in note 33.
    126National Grid plc Annual Report and Accounts 2012/13

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14. Derivative financial instruments  A derivative is a financial instrument used to manage the risk associated with fluctuations in the value of certain assets or liabilities. In
accordance with Board approved policies, we use derivatives to manage our exposure to fluctuations in interest rate and foreign exchange rate on borrowings and other contractual cash flows.
 Derivative financial instruments are initially recognised at fair value and
subsequently remeasured at fair value at each reporting date. Changes in fair values are recorded in either the income statement or other comprehensive income depending on the applicable accounting standards.
 Analysis of these derivatives and the various methods used to calculate their
respective fair values is detailed below and in note 30. Derivatives are financial instruments that derive their value from the price of an underlying item such as
interest rates, foreign exchange, credit spreads, commodities, equity or other indices. Derivatives enable their users to manage their exposure to these market or credit risks. We use derivatives to manage the interest rate and foreign exchange
risks from our financing portfolio and this enables the optimisation of the overall cost of accessing debt capital markets. We also use derivatives to manage our operational market risks from commodities. The commodity derivative contracts are
detailed in note 31. Derivative financial instruments are recorded at fair value through profit or loss. Where the fair value of a
derivative is positive it is carried as a derivative asset, and where negative as a derivative liability. Assets and liabilities on different transactions are only reported net if the transactions are with the same counterparty, a legal right of set
off exists and the cash flows are intended to be settled on a net basis. Gains and losses arising from the changes in fair value are included in the income statement in the period they arise. We calculate fair value of the financial derivatives by discounting all future cash flows by the market yield curve at the reporting date. The
market yield curve for each currency is obtained from external sources for interest and foreign exchange rates. In the case of derivative instruments that include options, the Blacks variation of the Black-Scholes model is used to calculate
fair value. Where possible, derivatives held as hedging instruments are formally designated as hedges as defined in IAS 39.
Derivatives may qualify as hedges for accounting purposes if they are fair value hedges, cash flow hedges or net investment hedges. Hedge accounting allows derivatives to be designated as a hedge of another (non-derivative) financial instrument, to mitigate the impact of
potential volatility in the income statement of changes in the fair value of the derivative instruments. To qualify for hedge accounting, documentation is prepared specifying the hedging strategy, the component transactions and methodology used for
effectiveness measurement. National Grid uses three hedge accounting methods, which are described as follows: Fair value hedges Fair value hedges principally consist of interest rate and cross-currency swaps that are used to protect against changes in the
fair value of fixed-rate, long-term financial instruments due to movements in market interest rates. For qualifying fair value hedges, all changes in the fair value of the derivative and changes in the fair value of the item in relation to the risk
being hedged are recognised in the income statement to the extent the fair value hedge is effective. Adjustments made to the carrying amount of the hedged item for fair value hedges will be amortised over the remaining life, in line with the hedged
item.
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Financial Statements Notes to the consolidated financial statements Continued  14. Derivative financial
instruments continued Cash flow hedges Exposure arises from the variability in future interest and currency cash flows on assets and liabilities which bear interest at variable rates or
are in a foreign currency. Interest rate and cross-currency swaps are maintained, and designated as cash flow hedges, where they qualify, to manage this exposure. Fair value changes on designated cash flow hedges are initially recognised directly in
the cash flow hedge reserve, as gains or losses recognised in equity and any ineffective portion is recognised immediately in the income statement. Amounts are transferred from equity and recognised in the income statement as the income or expense
is recognised on the hedged item. Forward foreign currency contracts are used to hedge anticipated and committed future currency cash
flows. Where these contracts qualify for hedge accounting they are designated as cash flow hedges. On recognition of the underlying transaction in the financial statements, the associated hedge gains and losses, deferred in equity, are transferred
and included with the recognition of the underlying transaction. When a forecast transaction is no longer expected to occur, the
cumulative gain or loss that was reported in equity is transferred to the income statement. Where a non-financial asset or a
non-financial liability results from a forecasted transaction or firm commitment being hedged, the amounts deferred in equity are included in the initial measurement of that non-monetary asset or liability. Net investment hedges Borrowings, cross-currency swaps and forward currency contracts are used in the management of the foreign exchange exposure arising from the
investment in non-sterling denominated subsidiaries. Where these contracts qualify for hedge accounting they are designated as net investment hedges. The cross-currency swaps and forward foreign currency contracts are hedge accounted using the spot to spot method. The foreign exchange gain or loss on retranslation of the borrowings and the spot to spot movements on the
cross-currency swaps and forward currency contracts are transferred to equity to offset gains or losses on translation of the net investment in the non-sterling denominated subsidiaries, with any ineffective portion recognised immediately in the
income statement. Derivatives not in a formal hedge relationship Our policy is not to use derivatives for trading purposes. However, due to the complex nature of hedge accounting under IAS 39 some derivatives
may not qualify for hedge accounting, or are specifically not designated as a hedge where natural offset is more appropriate. Changes in the fair value of any derivative instruments that do not qualify for hedge accounting are recognised in
remeasurements within the income statement. Discontinuation of hedge accounting Hedge accounting is discontinued when the hedging instrument expires or is sold, terminated, exercised or no longer qualifies for hedge
accounting. At that time, any cumulative gains or losses relating to cash flow hedges recognised in equity are initially retained in equity and subsequently recognised in the income statement in the same periods in which the previously hedged item
affects net profit or loss. Amounts deferred in equity with respect to net investment hedges are subsequently recognised in the income statement in the event of the disposal of the overseas operations concerned. For fair value hedges, the cumulative
adjustment recorded to the carrying value of the hedged item at the date hedge accounting is discontinued is amortised to the income statement using the effective interest method. Embedded derivatives No
adjustment is made with respect to derivative clauses embedded in financial instruments or other contracts that are defined as closely related to those instruments or contracts. Consequently these embedded derivatives are not accounted for
separately from the debt instrument. Where there are embedded derivatives in host contracts not closely related, the embedded derivative is separately accounted for as a derivative financial instrument.
    128National Grid plc Annual Report and Accounts 2012/13

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14. Derivative financial instruments continued Our use of derivatives may entail a derivative transaction qualifying for one or more hedge type designations under IAS 39. The fair value amounts by designated hedge type can be analysed as follows:  2013




2012Assets£m


Liabilities£m


Total£m




Assets£m


Liabilities£m


Total
£mFair value hedgesInterest rate swaps


390







390





230







230Cross-currency interest rate swaps


349



(7
)


342





409



(12
)


397739



(7
)


732





639



(12
)


627Cash flow hedgesInterest rate swaps






(90
)


(90
)








(87
)


(87
)Cross-currency interest rate swaps


361



(148
)


213





448



(57
)


391Foreign exchange forward contracts


3



(2
)


1









(5
)


(5
)Inflation linked swaps


4



(20
)


(16
)




2



(18
)


(16
)368



(260
)


108





450



(167
)


283Net investment hedgesCross-currency interest rate swaps


141



(197
)


(56
)




149



(214
)


(65
)Foreign exchange forward contracts


8



(47
)


(39
)




50







50149



(244
)


(95
)




199



(214
)


(15
)Derivatives not in a formal hedge relationshipInterest rate swaps


887



(884
)


3





754



(710
)


44Cross-currency interest rate swaps


33



(20
)


13





33



(16
)


17Foreign exchange forward contracts


4



(14
)


(10
)




14







14Forward rate agreements






(5
)


(5
)








(5
)


(5
)Inflation linked swaps


44



(226
)


(182
)




37



(297
)


(260
)968



(1,149
)


(181
)




838



(1,028
)


(190
)2,224



(1,660
)


564





2,126



(1,421
)


705Hedge positions offset within derivative instruments


21



(21
)








10



(10
)


Total


2,245



(1,681
)


564





2,136



(1,431
)


705 The maturity profile of derivative financial instruments is as follows:  2013




2012Assets£m


Liabilities£m


Total£m




Assets£m


Liabilities£m


Total
£mLess than 1 year


273



(407
)


(134
)




317



(162
)


155Current


273



(407
)


(134
)




317



(162
)


155In 1-2 years


42



(44
)


(2
)




109



(74
)


35In 2-3 years


75



(51
)


24





92



(60
)


32In 3-4 years


119



(121
)


(2
)




84



(30
)


54In 4-5 years


84



(55
)


29





116



(132
)


(16)More than 5 years


1,652



(1,003
)


649





1,418



(973
)


445Non-current


1,972



(1,274
)


698





1,819



(1,269
)


5502,245



(1,681
)


564





2,136



(1,431
)


705 For each class of derivative the notional contract* amounts are as follows:  2013
£m


2012
£mInterest rate swaps


(16,603)



(17,342)Cross-currency interest rate swaps


(9,641)



(6,305)Foreign exchange forward contracts


(3,142)



(4,636)Forward rate agreements


(2,443)



(4,223)Inflation linked swaps


(1,390)



(1,379)Total


(33,219)



(33,885) *The notional contract amounts of derivatives indicate the gross nominal value of transactions outstanding at the
reporting date
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Financial Statements Notes to the consolidated financial statements Continued  15. Inventories and current intangible assets  Inventories represent assets that we intend to use in order to generate revenue in future periods, either by selling the asset itself (for example
fuel stocks) or by using it to fulfil a service to a customer (consumables) or to maintain our network. Inventories are stated at the lower of cost, calculated on a weighted average basis, and net realisable value. Where applicable, cost comprises direct materials and direct labour costs as well as those overheads that have been incurred in
bringing the inventories to their present location and condition. Emission allowances, principally relating to the emissions of carbon
dioxide in the UK and sulphur and nitrous oxides in the US, are recorded as intangible assets within current assets and are initially recorded at cost and subsequently at the lower of cost and net realisable value. Where emission allowances are
granted by relevant authorities, cost is deemed to be equal to the fair value at the date of allocation. Receipts of such grants are treated as deferred income, which is recognised in the income statement as the related charges for emissions are
recognised or on impairment of the related intangible asset. A provision is recorded in respect of the obligation to deliver emission allowances and emission charges are recognised in the income statement in the period in which emissions are made.  2013
£m


2012
£mFuel stocks


114



191Raw materials and consumables


156



143Work in progress


13



13Current intangible assets  emission allowances


8



29291



376 There is a provision for obsolescence of £27m against inventories as at 31 March 2013 (2012:
£28m).
    130National Grid plc Annual Report and Accounts 2012/13

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16. Trade and other receivables  Trade and other receivables are amounts which are due from our customers for services we have provided. Other receivables also include prepayments
made by us, for example, property lease rentals paid in advance. Trade, loan and other receivables are initially recognised at fair value and subsequently measured at amortised
cost, less any appropriate allowances for estimated irrecoverable amounts. A provision is established for irrecoverable amounts when there is objective evidence that amounts due under the original payment terms will not be collected.  2013
£m


2012
£mTrade receivables


1,325



933Prepayments and accrued income


1,421



963Commodity contract assets


42



35Other receivables


122



402,910



1,971 Trade receivables are non interest-bearing and generally have a 30-90 day term. Due to their short maturities, the
fair value of trade and other receivables approximates their book value. Commodity contract assets are recorded at fair value. All other receivables are recorded at amortised cost. Provision for impairment of receivables  2013
£m


2012
£mAt 1 April


270



283Exchange adjustments


13



1Charge for the year, net of recoveries


75



103Uncollectible amounts written off against receivables


(97
)


(117)At 31 March


261



270 Trade receivables past due but not impaired  2013
£m


2012
£mUp to 3 months past due


242



1713 to 6 months past due


45



53Over 6 months past due


4



4291



228 For further information on our wholesale and retail credit risk, refer to note 30(c). For further information on
our commodity risk, refer to note 31.
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Financial Statements Notes to the consolidated financial statements Continued  17. Cash and cash equivalents  Cash and cash equivalents includes cash balances, together with short-term investments with an original maturity of less than three months that
are readily convertible to cash. Net cash and cash equivalents reflected in the cash flow statement are net of bank overdrafts, which are reported
in borrowings. The carrying amounts of cash and cash equivalents and bank overdrafts approximate their fair values. Cash at bank earns interest at floating rates based on daily bank deposit rates. Short-term deposits are made for periods varying between one day
and three months, depending on the immediate cash requirements, and earn interest at the respective short-term deposit rates. Net cash
and cash equivalents held in currencies other than sterling have been converted into sterling at year-end exchange rates. For further information on currency exposures, refer to note 30(a)(i).  2013
£m


2012
£mCash at bank


99



60Short-term deposits


572



272Cash and cash equivalents excluding bank overdrafts


671



332Bank overdrafts


(23
)


(33)Net cash and cash equivalents


648



299 At 31 March 2013, £21m (2012: £29m) of cash and cash equivalents were restricted. This primarily
relates to cash held in captive insurance companies.
    132National Grid plc Annual Report and Accounts 2012/13

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18. Businesses classified as held for sale  When the Directors have taken the decision to dispose of a component of the business, but the sale has not been completed at the year end, the
assets and liabilities relating to that component are removed from individual lines in the statement of financial position and grouped into assets held for sale and liabilities held for sale. This enables users of the financial statements to
understand more clearly what assets and liabilities the remaining business holds for continuing operations. Assets and businesses classified as held for sale are measured at the lower of carrying amount and fair value less
costs to sell. No depreciation is charged on assets and businesses classified as held for sale. Assets and businesses are classified
as held for sale if their carrying amount will be recovered or settled principally through a sale transaction rather than through continuing use. This condition is regarded as being met only when the sale is highly probable and the assets or
businesses are available for immediate sale in their present condition or the sale relates to a subsidiary acquired exclusively with a view to resale. Management must be committed to the sale, which should be expected to qualify for recognition as a
completed sale within one year from the date of classification. As at 31 March 2012, our EnergyNorth gas business and Granite
State electricity business in New Hampshire were reclassified as businesses held for sale. On 3 July 2012 we completed the sale of these businesses for net proceeds of £183m. The results of these businesses were not separately disclosed from those of continuing operations as they did not constitute a separate major line
of business or geographical area of National Grids operations. There were no assets or liabilities related to businesses held
for sale at 31 March 2013.  2013
£m


2012
£mGoodwill






34Other intangible assets






1Property, plant and equipment






192Other receivables






3Non-current assets






230Inventories






7Trade and other receivables






25Financial investments






2Current assets






34Assets of businesses held for sale






264Trade and other payables






(15)Current liabilities






(15)Borrowings






(10)Other non-current liabilities






(2)Deferred tax liabilities






(9)Pensions and other post-retirement benefit obligations






(14)Provisions






(37)Non-current liabilities






(72)Liabilities of businesses held for sale






(87)
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Financial Statements Notes to the consolidated financial statements Continued  19. Borrowings  We borrow money primarily in the form of bonds and bank loans. These are for a fixed term and may have fixed or floating interest rates. As
indicated in note 14, we use derivatives to manage risks associated with interest rates and foreign exchange.  Our strategy in action 
Our price controls and rate plans require us to fund our networks within a certain ratio of debt to equity and as a result we have issued a
significant amount of debt. As we continue to invest in our networks, the value of debt is expected to increase over time. To maintain a strong balance sheet and to allow us to access capital markets at commercially acceptable interest rates, we
balance the amount of debt we issue with the value of our assets, and take account of certain other metrics used by credit rating agencies. Borrowings, which include interest-bearing and inflation linked debt and overdrafts are recorded at their initial
fair value which normally reflects the proceeds received, net of direct issue costs less any repayments. Subsequently these are stated at amortised cost, using the effective interest method. Any difference between the proceeds after direct issue
costs and the redemption value is recognised over the term of the borrowing in the income statement using the effective interest method.  2013
£m


2012
£mCurrentBank loans


1,194



1,061Bonds


1,761



1,356Commercial paper


438



Finance leases


20



22Other loans


12



20Bank overdrafts


23



333,448



2,492Non-currentBank loans


1,863



2,160Bonds


22,435



18,012Finance leases


175



185Other loans


174



17624,647



20,533Total


28,095



23,025 Total borrowings are repayable as follows:  2013
£m


2012
£mLess than 1 year


3,448



2,492In 1-2 years


1,872



1,867In 2-3 years


860



1,725In 3-4 years


1,255



828In 4-5 years


1,420



1,252More than 5 years:by instalments


71



77other than by instalments


19,169



14,78428,095



23,025
    134National Grid plc Annual Report and Accounts 2012/13

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19. Borrowings continued The
fair value of borrowings at 31 March 2013 was £30,792m (2012: £25,217m). Market values, where available, have been used to determine fair value. Where market values are not available, fair values have been calculated by discounting
cash flows at prevailing interest rates. The notional amount outstanding of the debt portfolio at 31 March 2013 was £27,391m (2012: £22,618m). The assets of the Colonial Gas Company and the Niagara Mohawk Power Corporation and certain gas distribution assets of the Narragansett Electric
Company are subject to liens and other charges and are provided as collateral over borrowings totalling £512m at 31 March 2013 (2012: £487m). Collateral is placed with or received from any counterparty where we have entered into a credit support annex to the ISDA Master Agreement once
the current mark-to-market valuation of the trades between the parties exceeds an agreed threshold. Included in current bank loans is £730m (2012: £655m) in respect of cash received under collateral agreements. For further details of our
borrowing facilities, refer to note 32. For further details of our bonds in issue, please refer to the debt investor section of our website. Assets held under finance leases are recognised at their fair value or, if lower, the present value of the minimum lease payments on inception. The corresponding liability is recognised as a finance lease obligation within
borrowings. Rental payments are apportioned between finance costs and reduction in the finance lease obligation, so as to achieve a constant rate of interest. Assets held under finance leases are depreciated over the shorter of their useful life and the lease term. Finance lease obligations  2013
£m


2012
£mGross finance lease liabilities are repayable as follows:Less than 1 year


20



221-5 years


109



125More than 5 years


101



100230



247Less: finance charges allocated to future periods


(35)



(40)195



207The present value of finance lease liabilities is as follows:Less than 1 year


20



221-5 years


96



109More than 5 years


79



76195



207 20. Trade and other payables  Trade and other payables includes amounts owed to suppliers, tax authorities and other parties which are due to be settled within 12 months. The
total also includes deferred income, which represents monies received from customers but for which we have not yet completed the associated service. These amounts are recognised as revenue when the service is provided. Trade payables are initially recognised at fair value and subsequently measured at amortised cost.  2013
£m


2012
£mTrade payables


2,033



1,530Deferred income


155



305Commodity contract liabilities


69



149Social security and other taxes


131



107Other payables


663



5943,051



2,685 Due to their short maturities, the fair value of trade and other payables approximates their book value. Commodity
contract liabilities are recorded at fair value. All other trade and other payables are recorded at amortised cost.
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Financial Statements Notes to the consolidated financial statements Continued  21. Other non-current liabilities  Other non-current liabilities includes deferred income which will not be recognised as income until after 31 March 2014. It also includes
payables that are not due until after that date.  2013
£m


2012
£mDeferred income


1,579



1,557Commodity contract liabilities


70



111Other payables


235



2531,884



1,921 Commodity contract liabilities are recorded at fair value. All other non-current liabilities are recorded at
amortised cost. There is no material difference between the fair value and the carrying value of other non-current liabilities. 22. Pensions and other post-retirement benefits  Substantially all our employees are members of either defined benefit or defined contribution pension plans. The principal UK schemes are the
National Grid UK Pension Scheme and the National Grid Electricity Group of the Electricity Supply Pension Scheme. In the US, we have a number of plans and also provide healthcare and life insurance benefits to eligible retired US
employees. The fair value of plan assets and present value of defined benefit obligations are updated annually. For further details of
each scheme/plans terms and the actuarial assumptions used to value the associated assets and obligations, see note 29. Below we
provide a more detailed analysis of the amounts recorded in the primary financial statements. For defined contribution schemes, the Group pays contributions into a separate fund on behalf of the employee and
has no further obligations to employees. The risks associated with this type of scheme are assumed by the member. For defined benefit
retirement schemes, members receive benefits on retirement, the value of which is dependent on factors such as salary and length of pensionable service. The Group underwrites both financial and demographic risks associated with this type of scheme. The cost of providing benefits in a defined benefit scheme is determined using the projected unit method, with actuarial valuations
being carried out at each reporting date. The Groups obligation in respect of defined benefit pension schemes is calculated
separately for each scheme by estimating the amount of future benefit that employees have earned for their pensionable service in the current and prior periods. That benefit is discounted to determine its present value and the fair value of scheme assets and any unrecognised past service cost is then
deducted. The discount rate used is the yield at the valuation date on high quality corporate bonds. The Group takes advice from
independent actuaries relating to the appropriateness of the assumptions which include life expectancy of members, expected salary and pension increases, inflation and the return on scheme assets. We note that comparatively small changes in the
assumptions used may have a significant effect on the income statement and statement of financial position. The liabilities of the
defined benefit schemes are measured by discounting the best estimate of future cash flows to be paid using the projected unit method. This method is an accrued benefits valuation method that makes allowance for projected earnings. These calculations are performed by a qualified actuary. Actuarial gains and losses are recognised in full in the period in which they occur in the statement of other comprehensive income.
    136National Grid plc Annual Report and Accounts 2012/13

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22. Pensions and other
post-retirement benefits continued Amounts recognised in the income statement and statement of other comprehensive income  Pensions




US other post-retirement benefits2013
£m


2012
£m


2011
£m




2013
£m


2012
£m


2011
£mIncluded within payroll costsDefined contribution scheme costs


16



13



11













Defined benefit scheme costs:Current service cost


177



159



165





43



37



37Past service cost


1



2



28





6



6



3Curtailment (gain)/loss on redundancies


(7
)


13



(4
)








23



(29
)Special termination benefits on redundancies


20



19



6













Curtailment cost  augmentations


2



2



2













209



208



208





49



66



11Included within exceptional itemsNet loss/(gain) on disposal of businesses


3



(6
)


2





1







Included within finance income and costsInterest cost


1,020



1,063



1,084





133



140



147Expected return on plan assets


(1,130
)


(1,189
)


(1,185
)




(92
)


(84
)


(71
)(110
)


(126
)


(101
)




41



56



76Included within other comprehensive incomeActuarial net (loss)/gain during the year


(780
)


(1,207
)


483





(150
)


(118
)


88Exchange differences


(37
)


2



38





(75
)


6



87(817
)


(1,205
)


521





(225
)


(112
)


175Cumulative actuarial loss


(2,660
)


(1,880
)


(673
)




(542
)


(392
)


(274
)Amounts recognised in the statement of financial positionPensions





US other post-retirement benefits2013
£m


2012
£m


2011
£m




2013
£m


2012
£m


2011
£mPresent value of funded obligations


(23,410
)


(21,143
)


(19,255
)




(3,020
)


(2,630
)


(2,458
)Fair value of plan assets


21,770



19,957



18,903





1,515



1,192



1,066(1,640
)


(1,186
)


(352
)




(1,505
)


(1,438
)


(1,392
)Present value of unfunded obligations


(266
)


(243
)


(225
)












Other post-employment liabilities


(3
)


(5
)








(83
)


(66
)


(62
)Unrecognised past service cost


1



2



4





(3
)


3



9Net liability in the statement of financial position


(1,908
)


(1,432
)


(573
)




(1,591
)


(1,501
)


(1,445
)Liabilities


(2,103
)


(1,587
)


(1,129
)




(1,591
)


(1,501
)


(1,445
)Assets


195



155



556













Net liability


(1,908
)


(1,432
)


(573
)




(1,591
)


(1,501
)


(1,445
)
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Financial Statements Notes to the consolidated financial statements Continued  22. Pensions and other
post-retirement benefits continued  Pensions




US other post-retirement benefits2013


2012


2011




2013


2012


2011£m


£m


£m




£m


£m


£mChanges in the present value of defined benefit obligations (including unfunded
obligations)Opening defined benefit obligations


(21,386
)


(19,480
)


(19,598
)




(2,630
)


(2,458
)


(2,602
)Current service cost


(177
)


(159
)


(165
)




(43
)


(37
)


(37
)Interest cost


(1,020
)


(1,063
)


(1,084
)




(133
)


(140
)


(147
)Actuarial (losses)/gains


(1,930
)


(1,673
)


185





(176
)


(83
)


28Curtailment gain/(loss) on redundancies and settlements


43



(13
)


10





5



(23
)


29Transfers in






1



1













Special termination benefits


(20
)


(13
)


(17
)












Curtailment cost  augmentations


(2
)


(2
)


(2
)












Plan amendments










(28
)












14Medicare subsidy received
















(19
)


(6
)


(5
)Employee contributions


(3
)


(3
)


(3
)












Benefits paid


1,070



1,035



985





123



127



117Transferred to liabilities of businesses held for sale






3



7









2



2Exchange adjustments


(251
)


(19
)


229





(147
)


(12
)


143Closing defined benefit obligations



(23,676
)


(21,386
)


(19,480
)




(3,020
)


(2,630
)


(2,458
)Changes in the fair value of plan assetsOpening fair value of plan assets


19,957



18,903



18,186





1,192



1,066



950Expected return on plan assets


1,130



1,189



1,185





92



84



71Actuarial gains/(losses)


1,150



466



298





26



(35
)


60Transfers out






(1
)


(1
)












Employer contributions


425



415



408





262



198



158Employee contributions


3



3



3













Benefits paid


(1,070
)


(1,035
)


(985
)




(123
)


(127
)


(117
)Assets distributed in settlements and transfers


(39
)












(6
)






Exchange adjustments


214



17



(191
)




72



6



(56
)Closing fair value of plan assets


21,770



19,957



18,903





1,515



1,192



1,066Actual return on plan assets


2,280



1,655



1,483





118



49



131Expected contributions to plans in the following year


364



353



353





196



248



200 23. Provisions  We make provisions when an obligation exists, relating to events in the past and it is probable that cash will be paid to settle it, but the
amount of cash required can only be estimated.  The main estimates
relate to environmental and decommissioning costs for various sites we own or have owned which require restoration or remediation and other provisions, including lease contracts we have entered into that are now unprofitable.  Our strategy in action 
We are committed to the protection and enhancement of the environment. However, we have acquired, owned and operated a number of businesses which
have, during the course of their operations, created an environmental impact. We have a provision that reflects the expected cost to remediate these sites and it is uncommon that new sites with significant expected costs are added to the
provision as a result of current operations. Provisions are recognised where a legal or constructive obligation exists at the reporting date, as a result of a
past event, where the amount of the obligation can be reliably estimated and where the outflow of economic benefit is probable. Provision is made for decommissioning and environmental costs, based on future estimated expenditures, discounted to present values. An initial
estimate of decommissioning and environmental costs attributable to property, plant and equipment is recorded as part of the original cost of the related property, plant and equipment.
    138National Grid plc Annual Report and Accounts 2012/13

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23. Provisions continued Changes in the provision arising from revised estimates or discount rates or changes in the expected timing of expenditures that
relate to property, plant and equipment are recorded as adjustments to their carrying value and depreciated prospectively over their remaining estimated useful economic lives; otherwise such changes are recognised in the income statement. The unwinding of the discount is included within the income statement as a financing charge.  Environ-


Decom-











Totalmental


missioning


Restructuring


Emissions


Other


provisions£m


£m


£m


£m


£m


£mAt 1 April 2011


1,150



120



128



24



392



1,814Exchange adjustments


4



1











1



6Additions


58



1



39



7



14



119Unused amounts reversed


(9
)






(23
)


(6
)


(17
)


(55)Reclassified as held for sale


3



















3Unwinding of discount


53



1











18



72Utilised


(101
)


(11
)


(74
)


(2
)


(40
)


(228)At 31 March 2012


1,158



112



70



23



368



1,731Exchange adjustments


45



5







1



14



65Additions


92







31



1



83



207Unused amounts reversed


(55
)


(20
)


(5
)


(3
)


(4
)


(87)Unwinding of discount


59















16



75Utilised


(101
)


(16
)


(43
)


(14
)


(57
)


(231)At 31 March 2013


1,198



81



53



8



420



1,7602013


2012£m


£mCurrent


















308



282Non-current


















1,452



1,4491,760



1,731 Environmental provision The environmental provision represents the estimated restoration and remediation costs relating to a number of sites owned and managed by
subsidiary undertakings, together with certain US sites that National Grid no longer owns. The environmental provision is as follows:  2013




2012Discounted


Undiscounted


Real




Discounted


Undiscounted


Real£m


£m


discount rate




£m


£m


discount rateUK sites (i)


302



397



2%





306



423



2%US sites (ii)


896



1,014



2%





852



960



2%1,198



1,411









1,158



1,383  (i)
The remediation expenditure in the UK relates to old gas manufacturing sites and also to electricity transmission sites. Cash flows are expected to be incurred between 2013 and 2062. A number of
uncertainties affect the calculation of the provision, including the impact of regulation, accuracy of the site surveys, unexpected contaminants, transportation costs, the impact of alternative technologies and changes in the discount rate. This
provision incorporates our best estimate of the financial effect of these uncertainties, but future material changes in any of the assumptions could materially impact the calculation of the provision. The undiscounted amount is the undiscounted best
estimate of the liability having regard to these uncertainties.  (ii)
The remediation expenditure in the US is expected to be incurred between 2013 and 2058. The uncertainties regarding the calculation of this provision are similar to those considered in respect of
UK sites. However, unlike the UK, with the exception of immaterial amounts of such costs, this expenditure is expected to be largely recoverable from ratepayers under the terms of various rate agreements in the US. Decommissioning provision The
decommissioning provision primarily represents £69m (2012: £74m) of expenditure relating to asset retirement obligations expected to be incurred until 2058. It also includes the net present value of the estimated expenditure (discounted
at a real rate of 2%) expected to be incurred until 2038 in respect of the decommissioning of certain nuclear generating units that National Grid no longer owns. Restructuring provision The
restructuring provision principally relates to business reorganisation costs in the UK and the US and is expected to be incurred until 2014. At 31 March 2013, £5m of the total restructuring provision (2012: £8m) consisted of
provisions for the disposal of surplus leasehold interests and rates payable on surplus properties with expenditure expected to be incurred until 2018.
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Financial Statements Notes to the consolidated financial statements Continued  23. Provisions continued Emissions provision The provision for emission costs is expected to be settled using emission allowances granted. Other provisions Included within
other provisions at 31 March 2013 are amounts provided in respect of onerous lease commitments of £165m (2012: £178m). Other provisions also include £174m (2012: £141m) of estimated liabilities in respect of past events insured by insurance subsidiary undertakings, including employer liability claims. In accordance with insurance
industry practice, these estimates are based on experience from previous years and there is, therefore, no identifiable payment date. It also includes £13m (2012: £13m) in respect of obligations associated with investments in joint
ventures. 24. Share capital  Ordinary share capital represents the total number of shares issued which are publicly traded. We also disclose the number of treasury shares
the Company holds, which are shares that the Company has bought itself, predominantly to satisfy employee share option plan liabilities. Share capital is accounted for as an equity instrument. An equity instrument is any contract that includes a
residual interest in the consolidated assets of the Company after deducting all its liabilities and is recorded at the proceeds received, net of direct issue costs, with an amount equal to the nominal amount of the shares issued included in the
share capital account and the balance recorded in the share premium account.  Allotted, called upand fully paidOrdinary shares

millions


£mAt 1 April 2011


3,648



416Issued during the year in lieu of dividends (i)


53



6At 31 March 2012


3,701



422Issued during the year in lieu of dividends (i)


94



11At 31 March 2013


3,795



433  (i)
The issue of shares in lieu of dividends is considered to be a bonus issue under the terms of the Companies Act 2006 and the nominal value of the shares is charged to the share premium
account. The share capital of the Company consists of ordinary shares of
1117⁄43 pence nominal value each including American Depositary Shares. The ordinary and American Depositary Shares allow holders to receive dividends and vote
at general meetings of the Company. The Company holds treasury shares but may not exercise any rights over these shares including the entitlement to vote or receive dividends. There are no restrictions on the transfer or sale of ordinary
shares. In line with the provisions of the Companies Act 2006, National Grid plc has amended its Articles of Association and ceased to
have authorised share capital. Treasury shares At 31 March 2013, the Company held 129m (2012: 135m) of its own shares. The market value of these shares as at 31 March 2013 was
£989m (2012: £854m). The maximum number of shares held during the year was 135m ordinary shares (2012: 140m) representing
approximately 3.6% (2012: 3.8%) of the ordinary shares in issue as at 31 March 2013 and having a nominal value of £15m (2012: £16m).
    140National Grid plc Annual Report and Accounts 2012/13

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25. Other equity reserves  Other equity reserves are different categories of equity as required by accounting standards and represent the impact of a number of our
historical transactions. Other equity reserves comprise the translation reserve (see accounting policy B), cash flow hedge reserve (see
note 14), available-for-sale reserve (see note 12), the capital redemption reserve and the merger reserve. The merger reserve arose as a result of the application of merger accounting principles under the then prevailing UK GAAP, which under
IFRS 1 was retained for mergers that occurred prior to the IFRS transition date. Under merger accounting principles, the difference between the carrying amount of the capital structure of the acquiring vehicle and that of the acquired business
was treated as a merger difference and included within reserves. As the amounts included in other equity reserves are not attributable
to any of the other classes of equity presented, they have been disclosed as a separate classification of equity.  Translation£m


Cash flowhedge£m


Available-for-sale£m


Capitalredemption£m


Merger£m


Total£mAt 1 April 2010


414



(97
)


48



19



(5,165
)


(4,781
)Exchange adjustments


(95
)


















(95
)Net gains taken to equity






7



16











23Transferred to profit or loss






(7
)


(3
)










(10
)Rights issue (i)


















3,101



3,101Transferred to retained earnings (i)


















(3,101
)


(3,101
)Deferred tax






(2
)


(1
)










(3
)Share of other comprehensive loss of joint ventures






(4
)














(4
)At 31 March 2011


319



(103
)


60



19



(5,165
)


(4,870
)Exchange adjustments


27



















27Net (losses)/gains taken to equity






(18
)


16











(2
)Transferred to profit or loss






19



(9
)










10Deferred tax






2



(2
)










At 31 March 2012


346



(100
)


65



19



(5,165
)


(4,835
)Exchange adjustments


117



















117Net (losses)/gains taken to equity






(31
)


20











(11
)Transferred to profit or loss






73



(10
)










63Deferred tax






(13
)


(2
)










(15
)At 31 March 2013


463



(71
)


73



19



(5,165
)


(4,681
)  (i)
During the year ended 31 March 2011, the Company raised £3.2bn (net of expenses of £105m) through a rights issue of 990m new ordinary shares at 335 pence each on the basis of
two new ordinary shares for every five existing ordinary shares. The issue price represented a discount of 44% to the closing ex-dividend share price on 20 May 2010, the announcement date of the rights issue. The structure of the rights issue
initially gave rise to a merger reserve under section 612 of the Companies Act 2006, representing the net proceeds of the rights issue less the nominal value of the new shares issued. Following the receipt of the cash proceeds through the structure,
the excess of the net proceeds over the nominal value of the share capital issued was transferred from the merger reserve to retained earnings. The merger reserve represents the difference between the carrying value of subsidiary undertaking investments and their respective capital
structures following the Lattice demerger from BG Group plc and the 1999 Lattice refinancing of £5,745m and merger differences of £221m and £359m. The cash flow hedge reserve on interest rate swap contracts will be continuously transferred to the income statement until the borrowings are
repaid. The amount due to be released from reserves to the income statement next year is £14m and the remainder released with the same maturity profile as borrowings due after more than one year.
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Financial Statements Notes to the consolidated financial statements Continued  26. Net debt  Net debt represents the amount of cash and financial investments held, less borrowings, overdrafts and related derivatives. The movement in cash and cash equivalents is reconciled to movements in net debt. (a) Reconciliation of net cash flow to movement in net debt  2013
£m


2012
£m


2011
£mIncrease/(decrease) in cash and cash equivalents


335



(43
)


(346
)Increase/(decrease) in financial investments


2,992



(553
)


1,577(Increase)/decrease in borrowings and related derivatives


(4,304
)


154



1,763Net interest paid on the components of net debt


756



721



1,011Change in net debt resulting from cash flows


(221
)


279



4,005Changes in fair value of financial assets and liabilities and exchange movements


(536
)


(87
)


690Net interest charge on the components of net debt


(1,017
)


(1,042
)


(1,228
)Reclassified as held for sale






(2
)


9Other non-cash movements


(58
)


(14
)


(68
)Movement in net debt (net of related derivative financial instruments) in the year


(1,832
)


(866
)


3,408Net debt (net of related derivative financial instruments) at start of
year


(19,597
)


(18,731
)


(22,139
)Net debt (net of related derivative financial instruments) at end of
year


(21,429
)


(19,597
)


(18,731
) (b) Analysis of changes in net debt  Cash
and cashequivalents£m


Bankoverdrafts£m


Net cashand cashequivalents£m


Financialinvestments£m


Borrowings£m


Derivatives£m


Total(i)£mAt 1 April 2010


720



(29
)


691



1,397



(25,095
)


868



(22,139
)Cash flow


(333
)


(13
)


(346
)


1,551



2,933



(133
)


4,005Fair value gains and losses and exchange movements


(3
)






(3
)


(34
)


402



325



690Interest charges














25



(1,337
)


84



(1,228
)Reclassified as held for sale


















9







9Other non-cash movements


















(68
)






(68
)At 31 March 2011


384



(42
)


342



2,939



(23,156
)


1,144



(18,731
)Cash flow


(52
)


9



(43
)


(577
)


1,343



(444
)


279Fair value gains and losses and exchange movements














8



22



(117
)


(87
)Interest charges














23



(1,187
)


122



(1,042
)Reclassified as held for sale














(2
)










(2
)Other non-cash movements


















(14
)






(14
)At 31 March 2012


332



(33
)


299



2,391



(22,992
)


705



(19,597
)Cash flow


325



10



335



2,963



(3,433
)


(86
)


(221
)Fair value gains and losses and exchange movements


14







14



47



(452
)


(145
)


(536
)Interest charges














30



(1,137
)


90



(1,017
)Other non-cash movements


















(58
)






(58
)At 31 March 2013


671



(23
)


648



5,431



(28,072
)


564



(21,429
)Balances at 31 March 2013 comprise:Non-current assets






















1,972



1,972Current assets


671







671



5,431







273



6,375Current liabilities






(23
)


(23
)






(3,425
)


(407
)


(3,855
)Non-current liabilities


















(24,647
)


(1,274
)


(25,921
)671



(23
)


648



5,431



(28,072
)


564



(21,429
)  (i)
Includes accrued interest at 31 March 2013 of £250m (2012: £178m).
    142National Grid plc Annual Report and Accounts 2012/13

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Notes to the consolidated financial statements  supplementary information  This section includes information that is important to enable a full
understanding of our financial position, particularly areas of potential risk that could affect us in the future. We also include
specific disclosures for British Transco Finance Inc., Niagara Mohawk Power Corporation and National Grid Gas plc in accordance with various rules including Rule 3-10 of Regulation S-X, as they have issued public debt securities which have
been guaranteed by National Grid plc and one of its subsidiary companies, National Grid Gas plc. Additional disclosures have also been included in respect of the two guarantor companies. These disclosures are in lieu of publishing separate
financial statements for these companies. See note 35 for further information. 27. Commitments and
contingencies  Commitments are those amounts that we are contractually required to pay in the future as long as the other party meets its obligations. These
commitments primarily relate to operating lease rentals, energy purchase agreements and contracts for the repurchase of network assets which, in many cases, extend over a long period of time. We also disclose any contingencies,
which include guarantees that companies have given, where we pledge assets against current obligations that will remain for a specific period.  2013£m


2012£mFuture capital expenditureContracted for but not provided


3,011



2,728Operating lease commitmentsLess than 1 year


109



81In 1-2 years


84



96In 2-3 years


74



89In 3-4 years


72



66In 4-5 years


70



63More than 5 years


333



311742



706Energy purchase commitments (i)Less than 1 year


1,094



1,073In 1-2 years


535



511In 2-3 years


394



403In 3-4 years


306



357In 4-5 years


263



276More than 5 years


1,403



1,5543,995



4,174Guarantees and letters of creditGuarantee of sublease for US property (expires 2040)


293



304Guarantees of certain obligations of Grain LNG Import Terminal (expire up to 2028)


159



161Guarantee of certain obligations for construction of HVDC West Coast Link (expected expiry 2016)


618



691Other guarantees and letters of credit (various expiry dates)


262



1881,332



1,344  (i)
Energy purchase commitments relate to contractual commitments to purchase electricity or gas that are used to satisfy physical delivery requirements to our customers or for energy that we use
ourselves (ie normal purchase, sale or usage) and hence are accounted for as ordinary purchase contracts. Details of commodity contracts that do not meet the normal purchase, sale or usage criteria, and hence are accounted for as derivative
contracts, are shown in note 31. The total of future minimum sublease payments expected to be received under
non-cancellable subleases is £23m (2012: £22m). Through the ordinary course of our operations, we are party to various
litigation, claims and investigations. We do not expect the ultimate resolution of any of these proceedings to have a material adverse effect on our results of operations, cash flows or financial position.
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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  28.
Related party transactions  A related party is a company or individual who has an interest in us, for example a company that provides a service to us with a director who
holds a controlling stake in that company and who is also a Director of National Grid plc. The related parties identified include joint ventures, associated undertakings, investments and key management personnel. The following significant transactions with related parties were in the normal course of business; amounts
receivable from and payable to related parties are due on normal commercial terms:  2013£m


2012£m


2011£mSales: Goods and services supplied to a pension plan and joint ventures


10



10



11Purchases: Goods and services received from joint ventures and associates (i)


133



95



84Interest income: Interest receivable on loans with a joint venture










2Receivable from a pension plan and joint ventures


3



2



2Payable to joint ventures and associates


6



6



8Dividends received from associates (ii)


21



26



9  (i)
During the year the Company received goods and services from a number of joint ventures and associates, including Iroquois Gas Transmission System, L.P. of £37m (2012: £39m;
2011: £40m), Millennium Pipeline Company, LLC of £35m (2012: £32m; 2011: £28m) for the transportation of gas in the US and NGET/SPT Upgrades Limited of £52m (2012: £14m; 2011: £6m) for the construction
of a transmission link in the UK.  (ii)
Dividends were received from Iroquois Gas Transmission System, L.P. of £12m (2012: £17m; 2011: £9m) and Millennium Pipeline Company, LLC of £9m (2012: £9m; 2011:
£nil). Details of investments in principal subsidiary undertakings, joint ventures and associates are disclosed in
note 33 and information relating to pension fund arrangements is disclosed in notes 22 and 29. For details of Directors and key management remuneration, refer to note 2(c) and the audited section of the Remuneration Report. 29. Actuarial information on pensions and other post-retirement benefits  Further details of the defined benefit scheme/plans terms and the actuarial assumptions used to value the associated assets
and obligations are set out in this note.  When deciding on
these assumptions we take independent actuarial advice. Comparatively small changes in the assumptions used may have a significant effect on the overall deficit or surplus of a defined benefit scheme/plan. UK pension schemes National Grids defined benefit pension arrangements are funded with assets held in separate trustee administered funds. The arrangements are subject to independent actuarial valuations at least every three years and following
consultation and agreement with us, the qualified actuary certifies the rate of employers contribution, which, together with the specified contributions payable by the employees and proceeds from the schemes assets, are
expected to be sufficient to fund the benefits payable under the schemes. The last full actuarial valuations were carried out as at 31 March 2010. The 2013 valuation process has commenced. The results of the 2010 valuations are shown below:  NG UK Pension Scheme


NGEG of ESPS(i)Latest full actuarial valuation


31 March 2010



31 March 2010Actuary


Towers Watson



Aon HewittMarket value of scheme assets at latest valuation


£13,399m



£1,531mActuarial value of benefits due to members


£(13,998)m



£(2,038)mMarket value as percentage of benefits


96%



75%Funding deficit


£599m



£507mFunding deficit (net of tax)


£461m



£390m  (i)
National Grid Electricity Group of the Electricity Supply Pension Scheme. We have started discussions with our employees and our trade union partners to ensure our defined benefit pension schemes are affordable and sustainable for the future.
    144National Grid plc Annual Report and Accounts 2012/13

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29. Actuarial information on pensions and other post-retirement benefits continued National Grid UK Pension Scheme The 2010 actuarial valuation showed that, based on long-term financial assumptions, the contribution rate required to meet future benefit accrual
was 35% of pensionable earnings (32% employers and 3% employees). In addition, National Grid makes payments to the scheme to cover administration costs and the Pension Protection Fund (PPF) levy. The employer contribution rate and
administration costs will be reviewed as part of the 2013 actuarial valuation. Following the 2010 actuarial valuation, National
Grid and the Trustees agreed a recovery plan which would see the funding deficit repaid by 31 March 2027. Under the schedule of contributions, no deficit contributions were made in 2010/11 or 2011/12. Annual payments of £47m, rising
in line with the RPI from March 2010, commenced in 2012/13 and are due to continue until 2027. As part of this agreement, National
Grid has established a secured bank account with a charge in favour of the Trustees. The balance of the bank account at 31 March 2013 was £170m. The funds in the bank account will be paid to the scheme in the event that National Grid Gas
plc is subject to an insolvency event, or is given notice of less than 12 months that Ofgem intends to revoke its licence under the Gas Act 1986. The funds in the bank account will be released back to National Grid if the scheme moves into surplus. This scheme ceased to allow new hires to join from 1 April 2002. A defined contribution arrangement was offered for employees
joining after this date. National Grid is currently reviewing the defined contribution arrangement it offers to employees and new hires in the UK. National Grid Electricity Group of the Electricity Supply Pension Scheme The 2010 actuarial valuation showed that,
based on long-term financial assumptions, the contribution rate required to meet future benefit accrual was 29.6% of pensionable earnings (23.7% employers and an average of 5.9% employees). The employer contribution rate will be reviewed as part of
the 2013 actuarial valuation. Following the 2010 actuarial valuation, National Grid and the Trustees agreed a recovery plan that will
see the funding deficit repaid by 31 March 2027. Under the schedule of contributions, payments of £45m were made in 2010/11 and 2011/12 and a further payment of £38m was made in 2012/13. Thereafter, an annual payment of
£38m is due to be made, rising in line with RPI. As part of this agreement, National Grid has established a secured bank account with a charge in favour of the Trustees. The balance of the bank account at 31 March 2013 was £9m. The
funds in the bank account will be paid to the scheme in the event that National Grid Electricity Transmission plc (NGET) is subject to an insolvency event, or ceases to hold a licence granted under the Electricity Act 1989. The funds in the bank
account will be released back to National Grid if the scheme moves into surplus. National Grid has also agreed to make a payment in
respect of the deficit up to a maximum of £220m should certain triggers be breached; namely if NGET ceases to hold the licence granted under the Electricity Act 1989 or NGETs credit rating by two out of three specified agencies falls
below certain agreed levels for a period of 40 days. The scheme closed to new members from 1 April 2006. A defined contribution
arrangement was offered to new hires from this date. National Grid is currently reviewing the defined contribution arrangement it offers to employees and new hires in the UK. US pension plans National
Grids defined benefit pension plans in the US provide annuity or lump sum payments for vested employees. Non-union employees hired on or after 1 January 2011 are provided with a defined contribution plan. A defined contribution plan is
also provided to two groups of represented US employees. In addition, a matched defined contribution plan is offered to all eligible employees. The assets of the plans are held in separate trustee administered funds. Employees do not contribute to the defined benefit plans. Employer contributions are made in accordance with the rules set out by the US
Internal Revenue Code and can vary according to the funded status of the plans and the amounts that are tax deductible. At present, there is some flexibility in the amount that is contributed on an annual basis. In general, the Companys
policy for funding the US pension plans is to contribute amounts collected in rates. These contributions are expected to meet the requirements of the Pension Protection Act of 2006. US retiree healthcare and life insurance plans National Grid provides healthcare and life insurance benefits to eligible retired US employees. Eligibility is based on certain age and length of service requirements and in most cases retirees contribute to the cost of their
healthcare coverage. In the US, there is no governmental requirement to pre fund post-retirement health and welfare plans. However, in general, the Companys policy for funding the US retiree healthcare and life insurance plans
is to contribute amounts collected in rates.
 LOGO
   www.nationalgrid.com

Annual Report and Accounts 2012/13 National Grid plc    145




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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  29. Actuarial information on
pensions and other post-retirement benefits continued Asset allocations  UK pensions




US pensions




US other post-retirement benefits2013
%


2012
%


2011
%




2013
%


2012
%


2011
%




2013
%


2012
%


2011
%Equities (i)


30.9



33.3



34.5





47.2



47.7



51.5





75.0



76.6



76.5Corporate bonds (ii)


33.4



33.1



30.3





43.2



42.5



40.7





24.6



22.7



22.6Gilts


27.3



24.3



26.8



























Property


6.2



7.2



5.9





4.0



3.8



2.0













Other


2.2



2.1



2.5





5.6



6.0



5.8





0.4



0.7



0.9Total


100.0



100.0



100.0





100.0



100.0



100.0





100.0



100.0



100.0  (i)
Included within equities at 31 March 2013 were ordinary shares of National Grid plc with a value of £16m (2012: £13m; 2011: £12m).  (ii)
Included within corporate bonds at 31 March 2013 was an investment in a number of bonds issued by subsidiary undertakings with a value of £69m (2012: £50m; 2011: £39m). Target asset allocations  NGUK PS%

ESPS%

USpensions%

US  other
%Equities (i)

31

45

47

70Bonds, property and other assets

69

55

53

30Total

100

100

100

100  (i)
Included within equities are hedge fund and active currency investments. Actuarial assumptions For UK schemes, the expected long-term rate of return on assets has been set reflecting the
price inflation expectation, the expected real return on each major asset class and the long-term asset allocation strategy adopted for each scheme. The expected real returns on specific asset classes reflect historical returns, investment yields on
the measurement date and general future return expectations, and have been set after taking advice from independent actuaries. For US
plans, the estimated rate of return for various passive asset classes is based both on analysis of historical rates of return and forward-looking analysis of risk premiums and yields. Current market conditions, such as inflation and interest rates,
are evaluated in connection with the setting of our long-term assumptions. A small premium is added for active management of both equity and fixed income. The rates of return for each asset class are then weighted in accordance with the actual asset
allocation resulting in a long-term return on asset rate for each plan.  UK pensions




US pensions




US other post-retirement benefits2013%


2012%


2011%




2013%


2012%


2011%




2013
%


2012
%


2011
%Discount rate (i)


4.3



4.8



5.5





4.7



5.1



5.9





4.7



5.1



5.9Expected return on plan assets


4.9



5.5



6.1





6.4



6.6



7.2





6.6



6.8



7.1Rate of increase in salaries (ii)


4.1



4.0



4.4





3.5



3.5



3.5





3.5



3.5



3.5Rate of increase in pensions in payment


3.4



3.2



3.5



















n/a



n/a



n/aRate of increase in pensions in deferment


3.4



3.2



3.5



















n/a



n/a



n/aRate of increase in RPI (or equivalent)


3.4



3.2



3.5





2.4



2.1



2.2





n/a



n/a



n/aInitial healthcare cost trend rate


n/a



n/a



n/a





n/a



n/a



n/a





8.0



8.0



8.5Ultimate healthcare cost trend rate


n/a



n/a



n/a





n/a



n/a



n/a





5.0



5.0



5.0  (i)
The discount rates for pension liabilities have been determined by reference to appropriate yields on high quality corporate bonds prevailing in the UK and US debt markets at the reporting date.  (ii)
A promotional scale has also been used where appropriate.  2013




2012




2011UKyears


USyears




UKyears


US    years




UK    years


US    yearsAssumed life expectations for a retiree at age 65TodayMales






22.7



19.5





22.5



19.4





22.4



18.8Females






25.2



21.4





25.0



21.3





24.9



20.8In 20 yearsMales






25.0



21.0





24.9



20.9





24.7



18.8Females






27.6



22.2





27.5



22.2





27.4



20.8
 
   146National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

29. Actuarial information on
pensions and other post-retirement benefits continued The history of the present value of obligations, the fair value of plan assets
and of experience adjustments is as follows:  2013
£m


2012
£m


2011
£m


2010
£m


2009
£mPresent value of funded and unfunded obligations


(26,696
)


(24,016
)


(21,938
)


(22,200
)


(18,299
)Fair value of plan assets


23,285



21,149



19,969



19,136



15,519(3,411
)


(2,867
)


(1,969
)


(3,064
)


(2,780
)Difference between the expected and actual return on plan assets


1,176



431



358



3,192



(3,952
)Experience gains/(losses) on plan liabilities


134



(54
)


28



509



(125
)Actuarial (losses)/gains on plan liabilities


(2,106
)


(1,756
)


213



(3,923
)


1,934 30. Financial risk  Our activities expose us to a variety of financial risks: market risk, including foreign exchange risk, fair value interest rate risk, cash flow
interest rate risk, commodity price risk; credit risk; and liquidity risk. Our overall risk management programme focuses on the unpredictability of financial markets and seeks to minimise potential volatility of financial performance. We use
financial instruments, including derivative financial instruments, to manage risks of this type. 
This note describes our approach to managing market risk, including an analysis of assets and liabilities by currency type and an analysis of
interest rate category for our net debt. We are required by accounting standards to also include a number of specific disclosures (such as an analysis of contractual undiscounted cash flows by year falling due) and have included these
requirements below. Risk management related to financing activities is carried out by a central treasury department under policies
approved by the Finance Committee of the Board. The objective of the treasury department is to manage funding and liquidity requirements, including managing associated financial risks, to within acceptable boundaries. The Finance Committee
provides written principles for overall risk management, as well as written policies covering specific areas such as foreign exchange risk, interest rate risk, credit risk, liquidity risk, use of derivative financial instruments and non-derivative
financial instruments, and investment of excess liquidity. (a) Market risk (i) Foreign exchange risk National Grid operates internationally and is exposed to foreign exchange risk arising from various currency exposures, primarily
with respect to the dollar. Foreign exchange risk arises from future commercial transactions, recognised assets and liabilities, and investments in foreign operations. Our policy for managing foreign exchange transaction risk is to hedge contractually committed foreign currency cash flows over a prescribed
minimum size. Where foreign currency cash flow forecasts are less certain, our policy is to hedge a proportion of such cash flows based on the probability of those cash flows occurring. Instruments used to manage foreign exchange transaction risk
include foreign exchange forward contracts and foreign exchange swaps. Our policy for managing foreign exchange translation risk
relating to our net investment in foreign operations is to maintain a percentage of net debt and foreign exchange forwards so as to provide an economic offset of our cash flows arising in the foreign currency. The primary managed foreign exchange
exposure arises from the dollar denominated assets and liabilities held by our US operations, with a further small euro exposure in respect of a joint venture investment. During 2013 and 2012, derivative financial instruments were used to manage foreign currency risk as follows:  2013




2012Sterling£m


Euro£m


Dollar£m


Other£m


Total
£m




Sterling£m


Euro£m


Dollar£m


Other£m


Total
£mCash and cash equivalents


238



1



432







671





14



1



317







332Financial investments


3,938



124



1,289



80



5,431





1,021



84



1,200



86



2,391Borrowings (i)


(12,573
)


(5,220
)


(8,678
)


(1,624
)


(28,095
)




(11,034
)


(4,146
)


(7,284
)


(561
)


(23,025
)Pre-derivative position


(8,397
)


(5,095
)


(6,957
)


(1,544
)


(21,993
)




(9,999
)


(4,061
)


(5,767
)


(475
)


(20,302
)Derivative effect


320



5,368



(6,684
)


1,560



564





2,584



3,845



(6,206
)


482



705Net debt position


(8,077
)


273



(13,641
)


16



(21,429
)




(7,415
)


(216
)


(11,973
)


7



(19,597
)  (i)
Includes bank overdrafts. The overall exposure to dollars largely
relates to our net investment hedge activities as described in note 14.
 LOGO
   www.nationalgrid.com

Annual Report and Accounts 2012/13 National Grid plc    147




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##### Table of Contents

Financial Statements Notes to the consolidated financial statements  supplementary information Continued  30. Financial risk continued The currency exposure on other financial instruments is as follows:  2013


2012Sterling£m


Euro£m


Dollar£m


Other£m


Total£m


Sterling
£m


Euro£m


Dollar£m


Other£m


Total   £mTrade and other receivables


151







1,338







1,489



112







896







1,008Trade and other payables*


(1,328
)






(1,437
)






(2,765
)


(1,034
)


(1
)


(1,238
)






(2,273)Other non-current liabilities


(22
)






(283
)






(305
)


(24
)






(340
)






(364) *Comparatives have been reclassified to present items on a basis consistent with the current year classification The carrying amounts of other financial instruments are denominated in the above currencies, which in most instances are the
functional currency of the respective subsidiaries. Our exposure to dollars is due to activities in our US subsidiaries. We do not have any other significant exposure to currency risk on these balances. (ii) Cash flow and fair value interest rate risk National Grids interest rate risk arises from our long-term borrowings. Borrowings issued at variable rates expose National Grid to cash
flow interest rate risk, partially offset by cash held at variable rates. Borrowings issued at fixed rates expose National Grid to fair value interest rate risk. Our interest rate risk management policy is to seek to minimise total financing costs (being interest costs and changes in the market value of
debt) subject to constraints. We do this by using fixed- and floating-rate debt and derivative financial instruments including interest rate swaps, swaptions and forward rate agreements. We hold some borrowings on issue that are inflation linked. We believe that these provide a partial economic offset to the inflation risk
associated with our UK inflation linked revenues. The table in note 19 (borrowings) sets out the carrying amount, by contractual
maturity, of borrowings that are exposed to interest rate risk before taking into account interest rate swaps. During 2013 and 2012,
net debt was managed using derivative instruments to hedge interest rate risk as follows:  2013


2012Fixedrate£m



Floatingrate£m



Inflationlinked£m



Other£m
(i)


Total£m



Fixedrate£m



Floatingrate£m



Inflationlinked£m



Other£m
(i)


Total   £mCash and cash equivalents


577



94











671



289



43











332Financial investments


540



4,843







48



5,431



742



1,523







126



2,391Borrowings (ii)


(17,767
)


(3,700
)


(6,617
)


(11
)


(28,095
)


(13,394
)


(3,314
)


(6,304
)


(13
)


(23,025)Pre-derivative position


(16,650
)


1,237



(6,617
)


37



(21,993
)


(12,363
)


(1,748
)


(6,304
)


113



(20,302)Derivative effect (iii)


1,555



(1,132
)


141







564



1,220



(567
)


52







705Net debt position


(15,095
)


105



(6,476
)


37



(21,429
)


(11,143
)


(2,315
)


(6,252
)


113



(19,597)  (i)
Represents financial instruments which are not directly affected by interest rate risk, such as investments in equity or other similar financial instruments.  (ii)
Includes bank overdrafts.  (iii)
The impact of 2013/14 (2012: 2012/13) maturing short-dated interest rate derivatives is included.
    148National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

30. Financial risk continued (b)
Fair value analysis The financial instruments included on the statement of financial position are measured at fair value. These fair
values can be categorised into hierarchy levels that reflect the significance of the inputs used in measuring the fair value. The best evidence of fair value is a quoted price in an actively traded market. In the event that the market
for a financial instrument is not active, a valuation technique is used.  2013


2012Level 1£m


Level 2£m


Level 3£m


Total£m


Level 1£m


Level 2£m


Level 3£m


Total
£mAssetsAvailable-for-sale investments


4,510



209







4,719



1,741



185







1,926Derivative financial instruments (excluding commodity contracts)






2,197



48



2,245







2,078



58



2,136Commodity contracts






26



63



89







13



58



714,510



2,432



111



7,053



1,741



2,276



116



4,133LiabilitiesDerivative financial instruments (excluding commodity contracts)






(1,529
)


(152
)


(1,681
)






(1,193
)


(238
)


(1,431)Commodity contracts






(5
)


(134
)


(139
)






(62
)


(198
)


(260)



(1,534
)


(286
)


(1,820
)






(1,255
)


(436
)


(1,691)Total


4,510



898



(175
)


5,233



1,741



1,021



(320
)


2,442  Level 1:

Financial instruments with quoted prices for identical instruments in active markets.Level 2:

Financial instruments with quoted prices for similar instruments in active markets or quoted prices for identical or similar instruments in inactive markets and
financial instruments valued using models where all significant inputs are based directly or indirectly on observable market data.Level 3:

Financial instruments valued using valuation techniques where one or more significant inputs are based on unobservable market data. Our level 3 derivative financial instruments include cross-currency swaps with an embedded call option, currency
swaps where the currency forward curve is illiquid and inflation linked swaps where the inflation curve is illiquid. In valuing these instruments a third party valuation is obtained to support each reported fair value. Our level 3 commodity contracts primarily consist of our forward purchases of electricity and gas where pricing inputs are unobservable, as well
as other complex transactions. Complex transactions can introduce the need for internally developed models based on reasonable assumptions. Industry standard valuation techniques such as the Black-Scholes pricing model and Monte Carlo simulation are
used for valuing such instruments. Level 3 is also applied in cases when optionality is present or where an extrapolated forward curve is considered unobservable. All published forward curves are verified to market data; if forward curves differ
from market data by 5% or more they are considered unobservable. The changes in value of our level 3 derivative financial instruments
are as follows:  Derivative
financial instruments


Commodity contracts


Total2013Level 3valuation£m


2012Level 3valuation£m


2013Level 3valuation£m


2012Level 3valuation£m


2013Level 3valuation£m


2012
Level 3   valuation
£mAt 1 April


(180
)


54



(140
)


(79
)


(320
)


(25)Net gains/(losses) for the year (i) (ii)


79



(47
)


45



(98
)


124



(145)Purchases






(184
)


(14
)


(36
)


(14
)


(220)Settlements


(3
)


(3
)


39



73



36



70Reclassification out of level 3










(1
)






(1
)


At 31 March


(104
)


(180
)


(71
)


(140
)


(175
)


(320)  (i)
Gains of £79m (2012: £47m loss) are attributable to derivative financial instruments held at the end of the reporting period.  (ii)
Gains of £51m (2012: £96m loss) are attributable to commodity contract financial instruments held at the end of the reporting period. In 2013 the transfers out of level 3 were driven by changes in the observability of extrapolated forward curves.
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Annual Report and Accounts 2012/13 National Grid
plc    149




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##### Table of Contents

Financial Statements Notes to the consolidated financial statements  supplementary information Continued  30. Financial risk continued (b) Fair value analysis continued The impacts on a post-tax basis of reasonably possible changes in significant level 3 assumptions are as follows:  Commodity contracts


Other derivativefinancial instruments2013Incomestatement£m


2012Incomestatement£m


2013Incomestatement£m


2012  Income  statement  £m10% increase in commodity prices (i)


40



28







10% decrease in commodity prices (i)


(23
)


(16
)






Volume forecast uplift (ii)


(4
)


(5
)






Volume forecast reduction (ii)


4



6







Forward curve extrapolation






(2
)






+20 basis point change in LPI market curve (iii)










(62
)


(56)20 basis point change in LPI market
curve










60



52  (i)
Level 3 commodity price sensitivity is included within the sensitivity analysis disclosed in note 34.  (ii)
Volumes were flexed using maximum and minimum historical averages, or by ±10% where historical averages were not available.  (iii)
A reasonably possible change in assumption of other level 3 derivative financial instruments is unlikely to result in a material change in fair values. The impacts disclosed above were considered on a contract by contract basis with the most significant unobservable inputs identified. (c) Credit risk We are exposed
to the risk of loss resulting from counterparties default on their commitments including failure to pay or make a delivery on a contract. This risk is inherent in our commercial business activities. We are exposed to credit risk on our cash
and cash equivalents, derivative financial instruments, deposits with banks and financial institutions, as well as credit exposures to wholesale and retail customers, including outstanding receivables and committed transactions. Treasury credit risk Counterparty risk arises from the investment of surplus funds and from the use of derivative instruments. As at 31 March 2013, the following
limits were in place for investments held with banks and financial institutions:  Maximum limit£m


Long-term limit  £mAAA rated G8 sovereign entities


Unlimited



UnlimitedTriple A vehicles


301



255Triple A range institutions (AAA)


1,027 to 1,549



517 to 811Double A range institutions (AA)


613 to 772



312 to 386Single A range institutions (A)


211 to 301



108 to 154 As at 31 March 2012 and 2013, we had a number of exposures to individual counterparties. In accordance with
our treasury policies, counterparty credit exposure utilisations are monitored daily against the counterparty credit limits. Counterparty credit ratings and market conditions are reviewed continually with limits being revised and utilisation
adjusted, if appropriate. Management does not expect any significant losses from non performance by these counterparties. The
counterparty exposure under derivative financial contracts as shown in note 14 was £2,245m (2012: £2,136m); after netting agreements it was £1,337m (2012: £1,453m). This exposure is further reduced by collateral received as
shown in note 19. Additional information for commodity contract credit risk is in note 31. Wholesale and retail credit risk Our principal commercial exposure in the UK is governed by the credit rules within the regulated codes Uniform Network Code and
Connection and Use of System Code. These lay down the level of credit relative to the regulatory asset value (RAV) for each credit rating. In the US, we are required to supply electricity and gas under state regulations. Our credit policies and
practices are designed to limit credit exposure by collecting security deposits prior to providing utility services, or after utility service has commenced if certain applicable regulatory requirements are met. Collection activities are managed on a
daily basis. Sales to retail customers are usually settled in cash, cheques, electronic bank payments or by using major credit cards. We are committed to measuring, monitoring, minimising and recording counterparty credit risk in our wholesale
business. The utilisation of credit limits is regularly monitored and collateral is collected against these accounts when necessary. Management does not expect any significant losses of receivables that have not been provided for as shown in
note 16.
    150National Grid plc Annual Report and Accounts 2012/13

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30. Financial risk continued (d)
Liquidity analysis Our policy is to determine our liquidity requirements by the use of both short- and long-term cash flow forecasts.
These forecasts are supplemented by a financial headroom analysis which is used to assess funding adequacy for at least a 24 month period. We believe our contractual obligations, including those shown in commitments and contingencies in note 27 can be met from existing cash and investments, operating cash flows and other financings that we reasonably expect to be able
to secure in the future, together with the use of committed facilities if required. Our debt agreements and banking facilities contain
covenants, including those relating to the periodic and timely provision of financial information by the issuing entity and financial covenants such as restrictions on the level of subsidiary indebtedness. Failure to comply with these covenants, or
to obtain waivers of those requirements, could in some cases trigger a right, at the lenders discretion, to require repayment of some of our debt and may restrict our ability to draw upon our facilities or access the capital markets. The following is an analysis of the contractual undiscounted cash flows payable under financial liabilities and derivative assets and
liabilities as at the reporting date:  At 31 March 2013

Lessthan1 year£m


1-2 years£m


2-3 years£m


Morethan3 years£m


Total
£mNon-derivative financial liabilitiesBorrowings, excluding finance lease liabilities


(3,061
)


(1,836
)


(790
)


(21,704
)


(27,391)Interest payments on borrowings (i)


(951
)


(861
)


(842
)


(15,775
)


(18,429)Finance lease liabilities


(27
)


(26
)


(26
)


(151
)


(230)Other non interest-bearing liabilities


(2,696
)


(235
)










(2,931)Derivative financial liabilitiesDerivative contracts  receipts


1,388



816



1,053



441



3,698Derivative contracts  payments


(1,309
)


(469
)


(969
)


(569
)


(3,316)Commodity contracts


(150
)


(41
)


(35
)


(25
)


(251)Total


(6,806
)


(2,652
)


(1,609
)


(37,783
)


(48,850)At 31 March 2012

Lessthan1 year£m


1-2 years£m


2-3 years£m


Morethan3 years£m


Total
£mNon-derivative financial liabilitiesBorrowings, excluding finance lease liabilities


(2,157
)


(1,822
)


(1,707
)


(16,725
)


(22,411)Interest payments on borrowings (i)


(819
)


(749
)


(655
)


(8,927
)


(11,150)Finance lease liabilities


(22
)


(44
)


(30
)


(151
)


(247)Other non interest-bearing liabilities


(2,124
)


(253
)










(2,377)Derivative financial liabilitiesDerivative contracts  receipts


536



1,186



600



1,004



3,326Derivative contracts  payments


(336
)


(992
)


(370
)


(851
)


(2,549)Commodity contracts


(257
)


(54
)


(43
)


(62
)


(416)Total


(5,179
)


(2,728
)


(2,205
)


(25,712
)


(35,824)  (i)
The interest on borrowings is calculated based on borrowings held at 31 March without taking account of future issues. Floating-rate interest is estimated using a forward interest rate curve
as at 31 March. Payments are included on the basis of the earliest date on which the Company can be required to settle.
 LOGO
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Annual Report and Accounts 2012/13 National Grid
plc    151




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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  30. Financial risk continued (e) Capital risk management National Grids objectives when managing capital are: to safeguard our ability to continue as a going concern; to remain within regulatory
constraints of our regulated operating companies; and to maintain an efficient mix of debt and equity funding thus achieving an optimal capital structure and cost of capital. We regularly review and maintain or adjust the capital structure as
appropriate in order to achieve these objectives. Maintaining appropriate credit ratings for our regulated companies is an important
aspect of our capital risk management strategy and balance sheet efficiency. We monitor our balance sheet efficiency using several metrics including our interest cover. Interest cover for the year ended 31 March 2013 was 3.9, consistent
with the year ended 31 March 2012. Our long-term target range for interest cover is between 3.0 and 3.5, which we believe is consistent with single A range long-term senior unsecured debt credit ratings within our main UK operating companies,
National Grid Electricity Transmission plc and National Grid Gas plc, based on guidance from the rating agencies. In addition, we
monitor the regulatory asset value (RAV) gearing within each of National Grid Electricity Transmission plc and the regulated transmission and distribution businesses within National Grid Gas plc. This is calculated as net debt expressed as a
percentage of RAV, and indicates the level of debt employed to fund our UK regulated businesses. It is compared with the level of RAV gearing indicated by Ofgem as being appropriate for these businesses, at around 60%. The majority of our regulated operating companies in the US and the UK (and one intermediate UK holding company), which are all consolidated
subsidiaries of National Grid, are subject to certain restrictions on the payment of dividends by administrative order (by regulators relevant to the individual company), contract and/or licence. The types of restrictions that a company may have
that would prevent a dividend being declared or paid unless they are met include:  dividends must be approved in advance by
the relevant US state regulatory commission;  the subsidiary must have at least two recognised rating agency credit ratings of
at least investment grade;  dividends must be limited to cumulative retained earnings, including pre-acquisition retained
earnings;  National Grid plc must maintain an investment grade credit rating and if that rating
is the lowest investment grade bond rating it cannot have a negative watch/review downgrade notice by a credit rating agency; 
the subsidiary must not carry on any activities other than those permitted by the licences;  the subsidiary must not create any
cross-default obligations or give or receive any intra-group cross-subsidies; and  the percentage of equity compared with total
capital of the subsidiary must remain above certain levels. There is a further restriction relating only to the Narragansett Electric
Company, which is required to maintain its consolidated net worth above certain levels. These restrictions are subject to
alteration in the US as and when a new rate case or rate plan is agreed with the relevant regulatory bodies for each operating company and in the UK through the normal licence review process. As most of our business is regulated, at 31 March 2013 the majority of our net assets are subject to some of the restrictions noted above.
These restrictions are not considered to be significantly onerous, nor do we currently expect they will prevent the planned payment of dividends in future in line with our dividend policy. Some of our regulatory and bank loan agreements additionally impose lower limits for the long-term credit ratings that certain companies within
the Group must hold. All the above requirements are monitored on a regular basis in order to ensure compliance. The Company has complied with all externally imposed capital requirements to which it is subject.
    152National Grid plc Annual Report and Accounts 2012/13

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31. Commodity risk  We purchase electricity and gas to supply our customers in the US and to meet our own energy
needs. Substantially all our costs of purchasing electricity and gas for supply to customers are recoverable at an amount equal to cost. The timing of recovery of these costs can vary between financial periods leading to an under- or
over-recovery within any particular year, that can lead to large fluctuations in the income statement. We follow approved policies to manage price and supply risks for our commodity activities. Our energy procurement risk management policy and delegations of authority govern our US commodity trading
activities for energy transactions. The purpose of this policy is to ensure we transact within pre-defined risk parameters and only in the physical and financial markets where we or our customers have a physical market requirement. Commodity contracts that meet the definition of a derivative and which do not meet the exemption for normal sale, purchase or usage are carried at
fair value. Energy purchase contracts for the forward purchase of electricity or gas that are used to satisfy physical delivery
requirements to customers or for energy that the Company uses itself meet the normal purchase, sale or usage exemption of IAS 39 Financial Instruments: Recognition and Measurement. They are, therefore, not recognised in the financial
statements. Disclosure of commitments under such contracts is made in note 27. We enter into forward contracts for the purchase of
commodities, some of which do not meet the own use exemption for accounting purposes and hence are accounted for as derivatives. We also enter into derivative financial instruments linked to commodity prices, including index-linked swaps and futures
contracts. These derivative financial instruments are used to manage market price volatility and are carried at fair value on the statement of financial position, with the mark-to-market changes reflected through earnings. Remeasurements of commodity contracts carried at fair value are recognised in the income statement, with changes due to movements in commodity
prices recorded in operating costs and changes relating to movements in interest rates recorded in finance costs. Where contracts are
traded on a recognised exchange and margin payments are made, the contract fair values are reported net of the associated margin payments. The credit policy for commodity transactions is owned and monitored by the energy procurement risk management committee, under authority delegated by the Board and Executive Committee, and establishes controls and procedures to
determine, monitor and minimise the credit risk of counterparties. The counterparty exposure for our commodity derivatives is
£89m (2012: £71m), and after netting agreements it was £87m (2012: £58m). The fair value of our commodity
contracts by type can be analysed as follows:  2013


2012Assets£m


Liabilities£m


Total£m


Assets£m


Liabilities£m


Total   £mCommodity purchase contracts accounted for as derivative contractsForward purchases of electricity






(89
)


(89
)






(119
)


(119)Forward purchases/sales of gas


46



(45
)


1



48



(77
)


(29)Derivative financial instruments linked to commodity pricesElectricity swaps


16



(1
)


15



1



(25
)


(24)Electricity options


16







16



10







10Gas swaps


10



(4
)


6



12



(39
)


(27)Gas options


1







1











89



(139
)


(50
)


71



(260
)


(189)
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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  31. Commodity risk continued The maturity profile of commodity contracts is as follows:  2013


2012Assets£m


Liabilities£m


Total£m


Assets£m


Liabilities£m


Total   £mLess than one year


42



(69
)


(27
)


35



(149
)


(114)Current


42



(69
)


(27
)


35



(149
)


(114)In 1-2 years


13



(23
)


(10
)


9



(38
)


(29)In 2-3 years


10



(23
)


(13
)


5



(28
)


(23)In 3-4 years


14



(16
)


(2
)


6



(22
)


(16)In 4-5 years


2



(8
)


(6
)


11



(16
)


(5)More than 5 years


8







8



5



(7
)


(2)Non-current


47



(70
)


(23
)


36



(111
)


(75)Total


89



(139
)


(50
)


71



(260
)


(189) For each class of commodity contract, our exposure based on the notional quantities is as follows:  2013


2012Forward purchases of electricity (i)


2,595 GWh



3,403 GWhForward purchases/sales of gas (ii)


59m Dth



106m DthElectricity swaps


6,309 GWh



5,380 GWhElectricity options


32,299 GWh



36,580 GWhGas swaps


66m Dth



84m DthGas options


4m Dth



8m DthNYMEX gas futures (iii)


17m Dth



21m Dth  (i)
Forward electricity purchases have terms up to four years. The contractual obligations under these contracts are £174m (2012: £206m).  (ii)
Forward gas purchases have terms up to four years. The contractual obligations under these contracts are £119m (2012: £148m).  (iii)
NYMEX gas futures have been offset with related margin accounts. 32. Borrowing facilities  To support our long-term liquidity requirements and provide backup to commercial paper and other
borrowings, we agree loan facilities with financial institutions over and above the value of borrowings that may be required. These facilities have never been drawn, and our undrawn amounts are listed below. At 31 March 2013, we had bilateral committed credit facilities of £2,009m (2012: £1,140m). In
addition, we had committed credit facilities from syndicates of banks of £877m at 31 March 2013 (2012: £844m). All committed credit facilities were undrawn in 2013 and 2012. An analysis of the maturity of these undrawn committed
facilities is shown below:  2013£m


2012  £mUndrawn committed borrowing facilities expiring:Less than 1 year






313In 1-2 years


1,140



In 2-3 years


877



1,140In 3-4 years






531In 4-5 years


869



2,886



1,984 Subsequent to 31 March 2013, £1,140m of the facilities included above have been renegotiated to
£1,165m for a further five years. Of the unused facilities at 31 March 2013, £2,568m (2012: £1,671m) was held
as backup to commercial paper and similar borrowings, while £318m (2012: £313m) is available as backup to specific US borrowings. Further information on our bonds can be found on the debt investor section of our website.
    154National Grid plc Annual Report and Accounts 2012/13

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33. Subsidiary undertakings, joint ventures and associates  While we present consolidated results in these financial statements as if we were one company,
our structure is such that there are a number of different operating and holding companies that contribute to the overall result. Our structure has evolved through acquisitions as well as regulatory requirements to have certain activities within
separate legal entities. Principal subsidiary undertakings The principal subsidiary undertakings included in the consolidated financial statements at 31 March 2013 are listed below.
These undertakings are wholly-owned and, unless otherwise indicated, are incorporated in England and Wales.  Principal activityNational Grid Gas plc

Transmission and distribution of gasNational Grid Electricity Transmission plc

Transmission of electricityNew England Power Company (i)

Transmission of electricityMassachusetts Electric Company (i)

Distribution of electricityThe Narragansett Electric Company (i)

Transmission and distribution of electricityNiagara Mohawk Power Corporation (i)

Transmission of electricity and distribution of electricity and gasNational Grid Metering Limited

Metering servicesNational Grid Grain LNG Limited

LNG importation and storageBoston Gas Company (i)

Distribution of gasNational Grid Generation LLC (i)

Generation of electricityKeySpan Gas East Corporation (i)

Distribution of gasThe Brooklyn Union Gas Company (i)

Distribution of gasNGG Finance plc

FinancingNational Grid Property Holdings Limited

Property servicesNational Grid Holdings One plc

Holding companyLattice Group plc

Holding companyNational Grid USA (i)

Holding companyNiagara Mohawk Holdings, Inc. (i)

Holding companyNational Grid Commercial Holdings Limited

Holding companyNational Grid Holdings Limited

Holding companyKeySpan Corporation (i)

Holding companyNational Grid North America Inc. (formerly National Grid Holdings Inc.) (i)

Holding companyBritish Transco Finance Inc. (i)

FinancingBritish Transco International Finance BV (incorporated in the Netherlands)

Financing  (i)
Incorporated in the US. Principal joint ventures and associates The principal joint ventures and associated undertakings included in the financial statements at 31 March 2013 are listed below.
These undertakings are incorporated in England and Wales (unless otherwise indicated).  % of ordinaryshares held

Principal activityBritNed Development Limited

50

UK/Netherlands interconnectorNGET/SPT Upgrades Limited

50

England/Scotland interconnectorMillennium Pipeline Company, LLC (i)

26.25

Transmission of gasIroquois Gas Transmission System, L.P. (i)

20.4

Transmission of gas  (i)
Incorporated in the US. A full list of all subsidiary and associated
undertakings is available from the Group General Counsel & Company Secretary.
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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  34. Sensitivities on areas of estimation and uncertainty  In order to give a clearer picture of the impact that potential changes in estimates and
assumptions could have on our results and financial position, the following sensitivities are presented. These sensitivities are hypothetical only, as they are based on assumptions and conditions prevailing at the year end, and should be used with
caution. The effects provided are not necessarily indicative of the actual effects that would be experienced because our actual exposures are constantly changing. Revenue accruals A 10% change in our estimate of unbilled revenues at 31 March 2013 would result in an increase or decrease in our recorded net assets and profit for the year of approximately £77m (2012: £49m) net of tax. Asset useful lives An increase in the economic useful lives of assets of one year on average would reduce our annual depreciation charge on property, plant and
equipment by £68m (2012: £70m) (pre-tax) and our annual amortisation charge on intangible assets by £15m (2012: £11m) (pre-tax). Hedge accounting If, using our derivative financial instruments, hedge accounting had not been achieved during the
year ended 31 March 2013, the profit after tax for the year would have been £184m lower (2012: £165m higher) and net assets would have been £106m higher (2012: £163m higher). Provisions A 10% change in the
estimates of future cash flows in respect of provisions for liabilities would result in an increase or decrease in our provisions of approximately £176m (2012: £173m). Assets carried at fair value A
10% change in assets and liabilities carried at fair value would result in an increase or decrease in the carrying value of derivative financial instruments and commodity contract liabilities of £56m (2012: £71m) and £5m (2012:
£19m) respectively. Pensions and other post-retirement benefits The impact of increases in the discount rate, salary inflation and life expectancy is shown in the table below. The effect of a change in the
discount rate, driven by changes in corporate bond interest rates, would be expected to have a partial offset due to the related effects on asset values.  Change in pensions and other



Change in annual pension andpost-retirement benefit obligations



other post-retirement benefits cost2013

2012

2011



2013

2012

2011£m

£m

£m



£m

£m

£mSensitivities (all other assumptions held constant):0.1% change in discount rate

396

346

304



7

7

70.5% change in long-term rate of increase in salaries

178

158

162



9

8

8Change of one year to life expectancy at age 60

815

686

653



7

6

72013

2012

2011£m

£m

£mSensitivities to a 1% change in assumed healthcare cost trend rates:IncreaseEffect on the aggregate of the service costs and interest costs





32

29

28Effect on defined benefit obligations









453

366

330DecreaseEffect on the aggregate of the service costs and interest costs





(26)

(25)

(23)Effect on defined benefit obligations









(378)

(310)

(282)
    156National Grid plc Annual Report and Accounts 2012/13

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34. Sensitivities on areas of estimation and uncertainty continued Financial risk Our financial
instruments are sensitive to changes in market variables, being UK and US interest rates, the UK RPI and the dollar to sterling exchange rate. The changes in market variables impacts the valuation of our borrowings, deposits, derivative
financial instruments and commodity contracts. The following analysis illustrates the sensitivity of our financial instruments to the changes in market variables. The following main assumptions were made in calculating the sensitivity analysis:  

the amount of net debt, the ratio of fixed to floating interest rates of the debt and derivatives portfolio, and the proportion of financial instruments in foreign currencies are all constant
and on the basis of the hedge designations in place at 31 March 2013 and 2012 respectively; 

the statement of financial position sensitivity to interest rates relates only to derivative financial instruments and available-for-sale investments, as debt and other deposits are carried at
amortised cost and so their carrying value does not change as interest rates move; 

the sensitivity of accrued interest to movements in interest rates is calculated on net floating rate exposures on debt, deposits and derivative instruments; 

changes in the carrying value of derivatives from movements in interest rates of designated cash flow hedges are assumed to be recorded fully within equity; and 

changes in the carrying value of derivative financial instruments designated as net investment hedges from movements in interest rates are recorded in the income statement as they are
designated using the spot rather than the forward translation method. The impact of movements in the dollar to sterling exchange rate are recorded directly in equity. Using the above assumptions, and a number of others which have a far smaller impact overall, the following table shows the illustrative effect on
the income statement and items that are recognised directly in equity that would result from reasonably probable movements in the UK RPI, UK and US interest rates and in the dollar to sterling exchange rate, after the effects of tax.  Income

Other equity



Income

Other equitystatement

reserves



statement

reserves2013

2013



2012

2012+/- £m

+/- £m



+/- £m

+/- £mUK RPI +/- 0.50%*

25





24

UK interest rates +/- 0.50%

98

90



38

54US interest rates +/- 0.50%

87

16



23

11US dollar exchange rate +/- 10%

65

600



39

571 *Excludes sensitivities to Limited Price Inflation index. Further details on sensitivities are provided in note 30(b) The other equity reserves impact does not reflect the exchange translation in our US subsidiary net assets. It is estimated this would change by
£712m (2012: £691m) in the opposite direction if the dollar exchange rate changed by 10%. Commodity risk A sensitivity analysis has also been prepared on the basis that all commodity contracts are constant from the reporting date. Based on this, an
illustrative 10% movement in commodity prices would have the following impacts after the effects of tax:  Income

Incomestatement

statement2013

2012£m

£m10% increase in commodity prices

45

2910% decrease in commodity prices

(34)

(23) The income statement sensitivities would affect commodity remeasurements.
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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  35. Additional disclosures in respect of guaranteed securities  We have three debt issuances (including preferred shares) that are listed on a US national securities exchange and are guaranteed by companies in
the Group. These guarantors commit to honour any liabilities should the company issuing the debt have any financial difficulties. In order to provide debt holders with information on the financial stability of the companies providing the guarantees,
we are required to disclose individual financial information for these companies. We have chosen to include this information in the Group financial statements rather than submitting separate stand-alone financial
statements. The following condensed consolidating financial information, comprising statements of comprehensive income,
statements of financial position and cash flow statements, is given in respect of National Grid Gas plc (subsidiary guarantor), which became joint full and unconditional guarantor on 11 May 2004 with National Grid plc (parent guarantor) of the
6.625% Guaranteed Notes due 2018 issued in June 1998 by British Transco Finance Inc., then known as British Gas Finance Inc. (issuer of notes). Condensed consolidating financial information is also provided in respect of Niagara Mohawk Power
Corporation as a result of National Grid plcs guarantee, dated 29 October 2007, of Niagara Mohawks 3.6% and 3.9% issued preferred shares. National Grid Gas plc, British Transco Finance Inc., and Niagara Mohawk Power Corporation are
wholly-owned subsidiaries of National Grid plc. The following financial information for National Grid plc, National Grid Gas plc,
British Transco Finance Inc., and Niagara Mohawk Power Corporation on a condensed consolidating basis is intended to provide investors with meaningful and comparable financial information and is provided pursuant to various rules including Rule 3-10
of Regulation S-X in lieu of the separate financial statements of each subsidiary issuer of public debt securities. This
financial information should be read in conjunction with the Companys financial statements and footnotes presented in our 2012/13 Annual Report and Accounts. Summary statements of comprehensive income are presented, on a consolidating basis, for the three years ended 31 March 2013. Summary
statements of comprehensive income of National Grid plc and National Grid Gas plc are presented under IFRS measurement principles, as modified by the inclusion of the results of subsidiary undertakings on the basis of equity accounting principles. The summary statements of financial position of National Grid plc and National Grid Gas plc include the investments in subsidiaries
recorded on the basis of equity accounting principles for the purposes of presenting condensed consolidating financial information under IFRS. The summary statements of financial position present these investments within non-current financial
and other investments. The consolidation adjustments column includes the necessary amounts to eliminate the intercompany balances and
transactions between National Grid plc, National Grid Gas plc, British Transco Finance Inc., Niagara Mohawk Power Corporation and other subsidiaries.
    158National Grid plc Annual Report and Accounts 2012/13

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35. Additional disclosures in respect of guaranteed securities continued Summary statements of comprehensive income for the year ended 31 March 2013  IFRS  Parent     guarantor




Issuer of notes




Subsidiary guarantorNational Grid plc
£m




Niagara Mohawk Power  Corporation £m




British   Transco   Finance Inc.   £m




National Grid Gas plc
£m




Other  subsidiaries £m




Consolidationadjustments£m




National   Grid
consolidated
£mRevenue








2,129











3,062





9,345





(177)





14,359Operating costsDepreciation and amortisation








(119)











(511)





(731)











(1,361)Payroll costs








(282)











(238)





(943)











(1,463)Purchases of electricity








(561)

















(579)











(1,140)Purchases of gas








(151)











(128)





(1,036)











(1,315)Rates and property taxes








(141)











(235)





(593)











(969)Balancing Service Incentive Scheme


























(805)











(805)Payments to other UK network owners


























(487)











(487)Other operating costs








(356)











(573)





(2,313)





177





(3,065)





(1,610)











(1,685)





(7,487)





177





(10,605)Operating profit








519











1,377





1,858











3,754Net finance costs


(181)





(58)











(280)





(333)











(852)Dividends receivable


























1,900





(1,900)





Interest in equity accounted affiliates


2,437

















8





18





(2,445)





18Profit before tax


2,256





461











1,105





3,443





(4,345)





2,920Taxation


39





(178)











(174)





(311)











(624)Profit for the year


2,295





283





(i)





931





3,132





(4,345)





2,296Amounts recognised in other comprehensive income (ii)


(527)





(54)











3





(480)





531





(527)Total comprehensive income for the year


1,768





229











934





2,652





(3,814)





1,769Attributable to:Equity shareholders


1,768





229











934





2,651





(3,814)





1,768Non-controlling interests


























1











11,768





229











934





2,652





(3,814)





1,769 (i)
Profit for the year for British Transco Finance Inc. is £nil as interest payable to external bond holders is offset by interest receivable on loans to National Grid Gas plc. (ii)
Includes other comprehensive income relating to interest in equity accounted affiliates.
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Financial Statements Notes to the consolidated financial statements  supplementary information Continued  35. Additional disclosures in respect of guaranteed securities continued Summary statements of comprehensive income for the year ended 31 March 2012  IFRS  Parent     guarantor




Issuer of notes




Subsidiary guarantorNational
Grid plc £m




Niagara Mohawk Power  Corporation £m




British   Transco   Finance Inc.
£m




National Grid Gas
plc
£m




Other  subsidiaries £m




Consolidationadjustments£m




National
Grid consolidated £mRevenue








2,269











2,909





8,828





(174)





13,832Operating costsDepreciation and amortisation








(115)











(491)





(666)











(1,272)Payroll costs








(273)











(228)





(970)











(1,471)Purchases of electricity








(530)

















(915)











(1,445)Purchases of gas








(169)











(133)





(1,221)











(1,523)Rates and property taxes








(137)











(236)





(582)











(955)Balancing Service Incentive Scheme


























(818)











(818)Payments to other UK network owners


























(407)











(407)Other operating costs


1





(501)











(486)





(1,590)





174





(2,402)1





(1,725)











(1,574)





(7,169)





174





(10,293)Operating profit


1





544











1,335





1,659











3,539Net finance costs


(133)





(71)











(406)





(377)











(987)Dividends receivable


























350





(350)





Interest in equity accounted affiliates


2,141

















5





7





(2,146)





7Profit before tax


2,009





473











934





1,639





(2,496)





2,559Taxation


27





(195)











(102)





(251)











(521)Profit for the year


2,036





278





(i)





832





1,388





(2,496)





2,038Amounts recognised in other comprehensive income (ii)


(887)





(50)











9





(880)





921





(887)Total comprehensive income for the year


1,149





228











841





508





(1,575)





1,151Attributable to:Equity shareholders


1,149





228











841





506





(1,575)





1,149Non-controlling interests


























2











21,149





228











841





508





(1,575)





1,151 (i)
Profit for the year for British Transco Finance Inc. is £nil as interest payable to external bond holders is offset by interest receivable on loans to National Grid Gas plc. (ii)
Includes other comprehensive income relating to interest in equity accounted affiliates.
    160National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

35. Additional disclosures in respect of guaranteed securities continued Summary statements of comprehensive income for the year ended 31 March 2011  IFRS  Parent     guarantor




Issuer of notes

Subsidiary guarantorNational Grid plc£m





Niagara Mohawk Power  Corporation £m





British   Transco   Finance Inc.£m





National Grid Gasplc £m





Other  subsidiaries £m





Consolidationadjustments£m





NationalGrid consolidated £mRevenue








2,606











2,739





9,174





(176)





14,343Operating costsDepreciation and amortisation








(133)











(455)





(664)











(1,252)Payroll costs








(288)











(236)





(972)











(1,496)Purchases of electricity








(628)

















(854)











(1,482)Purchases of gas








(244)











(141)





(1,635)











(2,020)Rates and property taxes








(151)











(239)





(555)











(945)Balancing Service Incentive Scheme


























(581)











(581)Payments to other UK network owners


























(298)











(298)Other operating costs








(375)











(489)





(1,836)





176





(2,524)





(1,819)











(1,560)





(7,395)





176





(10,598)Operating profit








787











1,179





1,779











3,745Net finance costs


(261)





(119)











(395)





(353)











(1,128)Dividends receivable


























400





(400)





Interest in equity accounted affiliates


2,356

















7





7





(2,363)





7Profit before tax


2,095





668











791





1,833





(2,763)





2,624Taxation


64





(236)











(97)





(192)











(461)Profit for the year


2,159





432





(i)





694





1,641





(2,763)





2,163Amounts recognised in other comprehensive income (ii)


301





49











7





351





(407)





301Total comprehensive income for the year


2,460





481











701





1,992





(3,170)





2,464Attributable to:Equity shareholders


2,460





481











701





1,988





(3,170)





2,460Non-controlling interests


























4











42,460





481











701





1,992





(3,170)





2,464 (i)
Profit for the year for British Transco Finance Inc. is £nil as interest payable to external bond holders is offset by interest receivable on loans to National Grid Gas plc. (ii)
Includes other comprehensive income relating to interest in equity accounted affiliates.
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##### Table of Contents

Financial Statements Notes to the consolidated financial statements  supplementary information Continued  35. Additional disclosures in respect of guaranteed securities continued Statements of financial position as at 31 March 2013  IFRS  Parent     guarantor


Issuer of notes


Subsidiary guarantorNational Grid plc
£m


Niagara Mohawk Power Corporation £m


British Transco Finance Inc.
£m


National Grid Gas plc
£m


Other subsidiaries £m


Consolidationadjustments£m


National
Grid consolidated £mNon-current assetsGoodwill






737











4,291







5,028Other intangible assets














199



390







589Property, plant and equipment






4,441







12,122



20,029







36,592Deferred tax assets


























Other non-current assets






21







12



71







104Amounts owed by subsidiary undertakings


295











5,609



2,043



(7,947)



Pension assets






195



















195Financial and other investments


12,166



21







43



9,896



(21,477)



649Derivative financial assets


585











977



410







1,972Total non-current assets


13,046



5,415







18,962



37,130



(29,424)



45,129Current assetsInventories and current intangible assets






28







22



241







291Trade and other receivables


3



428







380



2,099







2,910Amounts owed by subsidiary undertakings


9,470



18



202



202



12,250



(22,142)



Financial and other investments


2,385



32







854



2,160







5,431Derivative financial assets


163











119



60



(69)



273Cash and cash equivalents


338



9







20



304







671Total current assets


12,359



515



202



1,597



17,114



(22,211)



9,576Assets of businesses held for sale


























Total assets


25,405



5,930



202



20,559



54,244



(51,635)



54,705Current liabilitiesBorrowings


(613)



(69)



(4)



(1,103)



(1,659)







(3,448)Derivative financial liabilities


(228)











(86)



(162)



69



(407)Trade and other payables


(44)



(132)







(590)



(2,285)







(3,051)Amounts owed to subsidiary undertakings


(9,029)



(70)







(3,152)



(9,891)



22,142



Current tax liabilities






(59)







(26)



(146)







(231)Provisions














(63)



(245)







(308)Total current liabilities


(9,914)



(330)



(4)



(5,020)



(14,388)



22,211



(7,445)Non-current liabilitiesBorrowings


(2,762)



(1,798)



(198)



(6,247)



(13,642)







(24,647)Derivative financial liabilities


(458)











(420)



(396)







(1,274)Other non-current liabilities






(281)







(1,053)



(550)







(1,884)Amounts owed to subsidiary undertakings


(2,042)















(5,905)



7,947



Deferred tax liabilities


(1)



(563)







(1,817)



(1,695)







(4,076)Pensions and other post-retirement benefit obligations






(977)











(2,717)







(3,694)Provisions






(268)







(121)



(1,063)







(1,452)Total non-current liabilities


(5,263)



(3,887)



(198)



(9,658)



(25,968)



7,947



(37,027)Liabilities of businesses held for sale


























Total liabilities


(15,177)



(4,217)



(202)



(14,678)



(40,356)



30,158



(44,472)Net assets


10,228



1,713







5,881



13,888



(21,477)



10,233EquityCalled up share capital


433



123







45



182



(350)



433Share premium account


1,344



1,930







204



7,426



(9,560)



1,344Retained earnings


13,132



(340)







4,325



6,468



(10,453)



13,132Other equity reserves


(4,681)











1,307



(193)



(1,114)



(4,681)Shareholders equity


10,228



1,713







5,881



13,883



(21,477)



10,228Non-controlling interests


















5







5Total equity


10,228



1,713







5,881



13,888



(21,477)



10,233
    162National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

35. Additional disclosures in respect of guaranteed securities continued Statements of financial position as at 31 March 2012  IFRS  Parent     guarantor


Issuer of notes


Subsidiary guarantorNational Grid plc


NiagaraMohawkPowerCorporation


BritishTranscoFinance Inc.


National Grid Gas plc


Othersubsidiaries


Consolidationadjustments


National    Grid
consolidated£m


£m


£m


£m


£m


£m


£mNon-current assetsGoodwill






701











4,075







4,776Other intangible assets






9







229



308







546Property, plant and equipment






4,038







11,650



18,013







33,701Deferred tax assets


1



















(1
)


Other non-current assets






2







11



82







95Amounts owed by subsidiary undertakings


537











5,611







(6,148
)


Pension assets






155



















155Financial and other investments


10,811



22







37



9,838



(20,116
)


592Derivative financial assets


624











856



339







1,819Total non-current assets


11,973



4,927







18,394



32,655



(26,265
)


41,684Current assetsInventories and current intangible assets






36







25



315







376Trade and other receivables


4



405







282



1,280







1,971Amounts owed by subsidiary undertakings


9,346



32



191



173



9,740



(19,482
)


Financial and other investments


830



22







432



1,107







2,391Derivative financial assets


207











85



135



(110
)


317Cash and cash equivalents


26



1











305







332Total current assets


10,413



496



191



997



12,882



(19,592
)


5,387Assets of businesses held for sale


















264







264Total assets


22,386



5,423



191



19,391



45,801



(45,857
)


47,335Current liabilitiesBorrowings


(897
)


(12
)


(4
)


(832
)


(747
)






(2,492)Derivative financial liabilities


(202
)










(52
)


(18
)


110



(162)Trade and other payables


(37
)


(258
)






(573
)


(1,817
)






(2,685)Amounts owed to subsidiary undertakings


(8,429
)


(260
)






(1,051
)


(9,742
)


19,482



Current tax liabilities






(173
)






(21
)


(189
)






(383)Provisions






(22
)






(57
)


(203
)






(282)Total current liabilities


(9,565
)


(725
)


(4
)


(2,586
)


(12,716
)


19,592



(6,004)Non-current liabilitiesBorrowings


(3,119
)


(1,309
)


(187
)


(6,568
)


(9,350
)






(20,533)Derivative financial liabilities


(463
)










(391
)


(415
)






(1,269)Other non-current liabilities






(235
)






(1,079
)


(607
)






(1,921)Amounts owed to subsidiary undertakings


















(6,148
)


6,148



Deferred tax liabilities






(400
)






(1,824
)


(1,515
)


1



(3,738)Pensions and other post-retirement benefit obligations






(913
)










(2,175
)






(3,088)Provisions






(248
)






(102
)


(1,099
)






(1,449)Total non-current liabilities


(3,582
)


(3,105
)


(187
)


(9,964
)


(21,309
)


6,149



(31,998)Liabilities of businesses held for sale


















(87
)






(87)Total liabilities


(13,147
)


(3,830
)


(191
)


(12,550
)


(34,112
)


25,741



(38,089)Net assets


9,239



1,593







6,841



11,689



(20,116
)


9,246EquityCalled up share capital


422



117







45



182



(344
)


422Share premium account


1,355



1,835







204



7,426



(9,465
)


1,355Retained earnings


12,297



(363
)






5,287



4,303



(9,227
)


12,297Other equity reserves


(4,835
)


4







1,305



(229
)


(1,080
)


(4,835)Shareholders equity


9,239



1,593







6,841



11,682



(20,116
)


9,239Non-controlling interests


















7







7Total equity


9,239



1,593







6,841



11,689



(20,116
)


9,246
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Annual Report and Accounts 2012/13 National Grid
plc    163




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##### Table of Contents

Financial Statements Notes to the consolidated financial statements  supplementary information Continued  35. Additional disclosures in respect of guaranteed securities continued Cash flow statements  Parent     guarantor


Issuer of notes


Subsidiary guarantorNational
Grid plc


NiagaraMohawkPowerCorporation


BritishTranscoFinance Inc.


National
Grid Gas plc


Othersubsidiaries


Consolidationadjustments


National  Grid
consolidated£m


£m


£m


£m


£m


£m


£mYear ended 31 March 2013Net cash flow from operating activities


36



162







1,608



1,944







3,750Net cash flow from/(used in) investing activities


(979
)


(286
)






(1,345
)


(1,048
)


(2,472
)


(6,130)Net cash flow from/(used in) financing activities


1,255



132







(240
)


(904
)


2,472



2,715Net increase/(decrease) in cash and cash equivalents in the year


312



8







23



(8
)






335Year ended 31 March 2012Net cash flow from operating activities


75



441







1,596



2,116







4,228Net cash flow from/(used in) investing activities


559



(287
)






(1,171
)


(1,166
)


(306
)


(2,371)Net cash flow from/(used in) financing activities


(808
)


(155
)






(502
)


(741
)


306



(1,900)Net increase/(decrease) in cash and cash equivalents in the year


(174
)


(1
)






(77
)


209







(43)Year ended 31 March 2011Net cash flow from operating activities


55



742







1,596



2,465







4,858Net cash flow from/(used in) investing activities


2,127



(377
)






(909
)


(1,850
)


(3,765
)


(4,774)Net cash flow from/(used in) financing activities


(2,180
)


(365
)






(621
)


(1,029
)


3,765



(430)Net increase/(decrease) in cash and cash equivalents in the year


2











66



(414
)






(346) Cash dividends were received by National Grid plc from subsidiary undertakings amounting to £570m during the
year ended 31 March 2013 (2012: £200m; 2011: £150m). Maturity analysis of parent Company borrowings  2013


2012£m


£mTotal borrowings are repayable as follows:Less than 1 year












613



897In 1-2 years












835



373In 2-3 years












51



826In 3-4 years












642



48In 4-5 years
















654More than 5 years, other than by instalments












1,234



1,2183,375



4,016
    164National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

Company accounting policies    We are required to include the stand-alone balance sheet of our ultimate parent Company,
National Grid plc, under the Companies Act 2006. This is because the publicly traded shares are actually those of National Grid plc (the Company) and the following disclosures provide additional information to shareholders. A. Basis of preparation of individual financial statements under UK GAAP These individual financial statements of the Company have been prepared in accordance with applicable UK accounting and financial
reporting standards and the Companies Act 2006. They have been prepared on an historical cost basis, except for the revaluation of financial instruments, and are presented in pounds sterling, which is the currency of the primary
economic environment in which the Company operates. The 2012 comparative financial information has also been prepared on this basis. These individual financial statements have been prepared on a going concern basis following the assessment made by the Directors as set out on page 57. The Company has not presented its own profit and loss account as permitted by section 408 of the Companies Act 2006. The Company has taken advantage of the exemptions in FRS 8 Related Party Disclosures from disclosing transactions with other members
of the National Grid plc group of companies. In accordance with exemptions under FRS 29 Financial Instruments:
Disclosures, the Company has not presented the financial instruments disclosures required by the standard, as disclosures which comply with the standard are included in the consolidated financial statements. B. Fixed asset investments Investments held as fixed assets are stated at cost less any provisions for impairment. Investments are reviewed for impairment if events or
changes in circumstances indicate that the carrying amount may not be recoverable. Impairments are calculated such that the carrying value of the fixed asset investment is the lower of its cost or recoverable amount. Recoverable amount is the
higher of its net realisable value and its value-in-use. C. Taxation Current tax for the current and prior periods is provided at the amount expected to be paid or recovered using the tax rates and tax laws that
have been enacted or substantively enacted by the balance sheet date. Deferred tax is provided in full on timing differences which
result in an obligation at the balance sheet date to pay more tax, or the right to pay less tax, at a future date, at tax rates expected to apply when the timing differences reverse based on tax rates and tax laws that have been enacted or
substantively enacted by the balance sheet date. Timing differences arise from the inclusion of items of income and expenditure in taxation computations in periods different from those in which they are included in the financial
statements. Deferred tax assets are recognised to the extent that it is regarded as more likely than not that they will be recovered.
Deferred tax assets and liabilities are not discounted.
 D. Foreign currencies Transactions in currencies other than the functional currency of the Company are recorded at the rates of exchange prevailing on the dates of
the transactions. At each balance sheet date, monetary assets and liabilities that are denominated in foreign currencies are retranslated at closing exchange rates. Gains and losses arising on retranslation of monetary assets and liabilities are included in the profit and loss account. E. Financial instruments The
Companys accounting policies under UK GAAP, namely FRS 25 Financial Instruments: Presentation, FRS 26 Financial Instruments: Measurement and FRS 29 Financial Instruments: Disclosures, are the same as
the Groups accounting policies under IFRS, namely IAS 32 Financial Instruments: Presentation, IAS 39 Financial Instruments: Recognition and Measurement and IFRS 7 Financial Instruments: Disclosures. The
Company applies these policies only in respect of the financial instruments that it has, namely investments, derivative financial instruments, debtors, cash at bank and in hand, borrowings and creditors. The policies are set out in notes 12, 14, 16, 17, 19 and 20 to the consolidated financial statements. The Company is taking the exemption for
financial instruments disclosures, because IFRS 7 disclosures are given in notes 30 and 34 to the consolidated financial statements. F.
Hedge accounting The Company applies the same accounting policy as the Group in respect of fair value hedges and cash flow hedges.
This policy is set out in note 14 to the consolidated financial statements. G. Parent Company guarantees The Company has guaranteed the repayment of the principal sum, any associated premium and interest on specific loans due by certain
subsidiary undertakings primarily to third parties. In the event of default or non performance by the subsidiary, the Company recognises such guarantees as insurance contracts, at fair value with a corresponding increase in the carrying value
of the investment. H. Share awards to employees of subsidiary undertakings The issuance by the Company to employees of its subsidiaries of a grant over the Companys options represents additional capital
contributions by the Company to its subsidiaries. An additional investment in subsidiaries results in a corresponding increase in shareholders equity. The additional capital contribution is based on the fair value of the option at the date of
grant, allocated over the underlying grants vesting period. Where payments are subsequently received from subsidiaries, these are accounted for as a return of a capital contribution and credited against the Companys investments in
subsidiaries. The Company has no employees. I. Dividends Interim dividends are recognised when they are paid to the Companys shareholders. Final dividends are recognised when they are approved by
shareholders.
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Annual Report and Accounts 2012/13 National Grid
plc    165




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##### Table of Contents

Financial Statements Company balance sheet at 31 March   2013


2012Notes


£m


£mFixed assetsInvestments


1



8,177



8,157Current assetsDebtors (amounts falling due within one year)


2



9,636



9,557Debtors (amounts falling due after more than one year)


2



880



1,162Investments


5



2,723



855Cash at bank and in hand










1Total current assets






13,239



11,575Creditors (amounts falling due within one year)


3



(9,914
)


(9,565)Net current assets






3,325



2,010Total assets less current liabilities






11,502



10,167Creditors (amounts falling due after more than one year)


3



(5,263
)


(3,582)Net assets






6,239



6,585Capital and reservesCalled up share capital


7



433



422Share premium account


8



1,344



1,355Cash flow hedge reserve


8



12



9Other equity reserves


8



240



220Profit and loss account


8



4,210



4,579Total shareholders funds


9



6,239



6,585 The notes on pages 167 to 169 form part of the individual financial statements of the Company, which were approved
by the Board of Directors on 15 May 2013 and were signed on its behalf by: Sir Peter Gershon Chairman Andrew Bonfield Finance Director
    166National Grid plc Annual Report and Accounts 2012/13

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##### Table of Contents

Notes to the Company financial statements  1. Fixed asset investments  Shares in
subsidiary undertakings £mAt 1 April 2011

7,890Additions

267At 31 March 2012

8,157Additions

20At 31 March 2013

8,177 During the year there was a capital contribution of £20m (2012: £24m) which represents the fair value
of equity instruments granted to subsidiaries employees arising from equity-settled employee share schemes. During the year ended 31 March 2012, the Company also acquired a further 69,242 ordinary shares of £1 each in National
Grid (US) Holdings Limited for a total consideration of £243m. The names of the principal subsidiary undertakings, joint
ventures and associates are included in note 33 to the consolidated financial statements. The Directors believe that the carrying value of the investments is supported by the fair value of their underlying net assets. 2. Debtors  2013£m


2012  £mAmounts falling due within one year:Derivative financial instruments (note 4)


163



207Amounts owed by subsidiary undertakings


9,470



9,346Prepayments and accrued income


3



49,636



9,557Amounts falling due after more than one year:Derivative financial instruments (note 4)


585



624Amounts owed by subsidiary undertakings


295



537Deferred taxation






1880



1,162 3. Creditors  2013£m


2012  £mAmounts falling due within one year:Borrowings (note 6)


613



897Derivative financial instruments (note 4)


228



202Amounts owed to subsidiary undertakings


9,029



8,429Other creditors


44



379,914



9,565Amounts falling due after more than one year:Borrowings (note 6)


2,762



3,119Derivative financial instruments (note 4)


458



463Amounts owed to a subsidiary undertaking


2,042



Deferred taxation


1



5,263



3,582
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Annual Report and Accounts 2012/13 National Grid
plc    167




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##### Table of Contents

Financial Statements Notes to the Company financial statements Continued  4. Derivative financial instruments The fair values of derivative financial instruments are:  2013




2012Assets£m


Liabilities£m


Total£m




Assets£m


Liabilities£m


Total£mAmounts falling due within one year


163



(228
)


(65
)




207



(202
)


5Amounts falling due after more than one year


585



(458
)


127





624



(463
)


161748



(686
)


62





831



(665
)


166For each class of derivative the notional
contract* amounts are as follows:2013
£m


2012
£mInterest rate swaps




















(8,015
)


(8,624
)Cross-currency interest rate swaps




















(5,376
)


(3,829
)Foreign exchange forward contracts




















(9,080
)


(9,801
)Total




















(22,471
)


(22,254
)*The notional contract amounts of derivatives indicate the gross nominal
value of transactions outstanding at the balance sheet date  5. Investments 
The following table sets out the Companys current asset investments:2013
£m


2012
£mInvestments in short-term money funds




















2,113



705Short-term deposits




















438



34Restricted cash balances  collateral




















172



1162,723



8556.
Borrowings  The following table analyses the Companys total
borrowings:2013
£m


2012
£mAmounts falling due within one year:Bank loans




















277



134Bonds




















336



763613



897Amounts falling due after more than one year:Bank loans
























125Bonds




















2,762



2,9942,762



3,119Total borrowings




















3,375



4,016 The maturity of total borrowings is disclosed in note 35 on page 164 to the consolidated financial statements.
There are no differences in the maturities as calculated under IFRS or UK GAAP. The notional amount of borrowings outstanding as at
31 March 2013 was £3,250m (2012: £3,878m). Further information on significant borrowings can be found on the debt investors section of our website. 7. Called up share capital The called up share capital amounting to £433m (2012: £422m) consists of 3,794,575,998 (2012: 3,700,949,542) ordinary shares.
For further information on share capital, refer to note 24 to the consolidated financial statements.
    168National Grid plc Annual Report and Accounts 2012/13

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8. Reserves  Share    premiumaccount£m


Cash flowhedge
reserve
£m


Other equityreserves
£m


Profit and    loss account  £mAt 1 April 2011


1,361



2



196



5,471Transferred from equity in respect of cash flow hedges (net of tax)






7







Shares issued in lieu of dividends


(6
)










Issue of treasury shares














13Purchase of own shares














(4)Share awards to employees of subsidiary undertakings










24



Loss for the financial year














(901)At 31 March 2012


1,355



9



220



4,579Transferred from equity in respect of cash flow hedges (net of tax)






3







Shares issued in lieu of dividends


(11
)










Issue of treasury shares














19Purchase of own shares














(6)Share awards to employees of subsidiary undertakings










20



Loss for the financial year














(382)At 31 March 2013


1,344



12



240



4,210There were no gains and losses, other than
losses for the years stated above; therefore no separate statement of total recognised gains and losses has been presented. At 31 March 2013, £86m (2012: £273m) of the profit and loss account reserve relating to gains on intra-group
transactions was not distributable to shareholders.  9. Reconciliation of movements in total shareholders funds2013
£m


2012
£mProfit for the financial year










428



105Dividends (i)










(810
)


(1,006)Loss for the financial year










(382
)


(901)Issue of treasury shares










19



13Purchase of own shares










(6
)


(4)Movement on cash flow hedge reserve (net of tax)










3



7Share awards to employees of subsidiary undertakings










20



24Net decrease in shareholders funds










(346
)


(861)Opening shareholders funds










6,585



7,446Closing shareholders funds










6,239



6,585(i)    For further details of dividends paid and payable to shareholders, refer to
note 7 to the consolidated financial statements.  10. Parent Company guarantees 
The Company has guaranteed the repayment of the principal sum, any associated premium and interest on specific loans due by certain
subsidiary undertakings primarily to third parties. At 31 March 2013, the sterling equivalent amounted to £2,767m (2012: £703m). The guarantees are for varying terms from less than one year to open-ended.
 11. Audit fees
 The audit fee in respect of the parent Company was £25,750 (2012:
£25,000). Fees payable to PricewaterhouseCoopers LLP for non-audit services to the Company are not required to be disclosed as they are included within note 2 to the consolidated financial statements.
 LOGO
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##### Table of Contents

Additional Information Additional information Business information in detail   Contents170

Business information in detail170

UK regulation172

US regulation176

Risk factors179

Internal control179

Information assurance179

Disclosure controls179

Internal control over financial reporting179

Changes to internal control over financial reporting180

Directors Report disclosures180

Articles of Association180

Board biographies182

Capital Gains Tax182

Change of control provisions182

Charitable donations182

Conflicts of interest183

Directors indemnity183

Events after the reporting period183

Material interests in shares183

Policy and practice on payment of creditors183

Political donations and expenditure183

Research and development183

Share capital184

Other disclosures184

Articles of Association185

Code of Ethics185

Corporate governance practices: differences from New York Stock Exchange (NYSE) listing standards185

Depositary payments to the Company186

Description of securities other than equity securities: depositary fees and charges186

Documents on display186

Employees186

Exchange controls186

Exchange rates187

Key milestones187

Material contracts187

Property, plant and equipment187

Shareholder analysis187

Taxation189

The offer and listing including price history189

Unresolved SEC staff comments
 UK regulation Our licences, established under the Gas Act 1986 and Electricity Act 1989, as amended (the Acts), require us to develop, maintain and operate
economic and efficient networks and to facilitate competition in the supply of gas and electricity in Great Britain. They also give us statutory powers, such as the right to bury our pipes or cables under public highways and the ability to use
compulsory powers to purchase land to enable the conduct of our business. Our networks are regulated by Ofgem, which has established
price control mechanisms that set the amount of revenue that can be earned by our regulated businesses. Price control regulation is designed to ensure our interests, as a monopoly, are balanced with those of our customers. Ofgem allows us to
charge reasonable, but not excessive, prices giving us a future level of revenue sufficient to meet our statutory duties and licence obligations, and also to make a reasonable return on our investment. The price control includes a number of mechanisms to achieve its objectives, including financial incentives designed to encourage us to:
continuously improve the cost and effectiveness of our services; manage and operate our networks efficiently; deliver high quality services to our customers and wider stakeholder community; and invest in the development of the network in a manner
that ensures long-term security of supply. Our UK Transmission and UK Gas Distribution businesses operate under eight separate price
controls in the UK. These comprise two for our UK electricity transmission operations, one covering our role as transmission owner (TO) and the other for our role as system operator (SO); two for our gas transmission operations, again one as TO and
one as SO; and one for each of our four regional gas distribution networks. While each of the eight price controls may have differing terms, they are based on a consistent regulatory framework. In addition to the eight price controls, our LNG storage business has a price control covering some aspects of its operations. There is also a
tariff cap price control applied to certain elements of domestic metering and daily meter reading activities undertaken by National Grid Metering. Price controls up to 31 March 2013 The previous price control mechanisms for our UK Transmission and UK Gas
Distribution businesses expired on 31 March 2013 and were consistent with the description provided on page 16. 2012/13 saw
another good year of performance, outperforming the allowed returns in each of the three main businesses:  As at 31 March 2013

RAV


Allowedvanillareturn

Achievedvanillareturn

Achieved ROEElectricity transmission


£10,145m


4.75%

5.4%

11.8%Gas transmission


£5,340m


4.75%

7.5%

17.2%Gas distribution


£8,330m


4.94%

6.0%

13.5%Total


£23,815m


4.82%

6.1%

13.6%








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RIIO price controls Our UK regulator has introduced a new regulatory framework called RIIO (revenue = incentives + innovation + outputs) that became effective on
1 April 2013 and lasts for eight years. The building blocks of the RIIO price control are broadly similar to the historical price controls used in the UK, however there are some significant differences in the mechanics of the calculations. How is revenue calculated? Under RIIO the outputs we deliver are clearly articulated and are integrally linked to the calculation of our allowed revenue. These outputs have been determined through an extensive consultation process which has given stakeholders
a greater opportunity to input to these decisions. The clarity around outputs should lead to greater transparency of our performance in delivering them. The six key output categories are:  

Safety:ensuring the provision of a safe energy network  

Reliability (and availability):promoting networks capable of delivering long-term reliability, as well as minimising the number and duration of interruptions
experienced over the price control period, and ensuring adaptation to climate change  

Environmental impact:encouraging companies to play their role in achieving broader environmental objectives  specifically facilitating the reduction of carbon
emissions  as well as minimising their own carbon footprint  

Customer and stakeholder satisfaction:maintaining high levels of customer satisfaction and stakeholder engagement, and improving service levels  

Customer connections:encouraging networks to connect customers quickly and efficiently  

Social obligations (Gas Distribution only):extending the gas network to communities that are fuel poor where it is efficient to do so and introducing measures to
address carbon monoxide poisoning incidents Within each of these output categories are a number of primary and secondary
deliverables, reflecting what our stakeholders want us to deliver over the coming price control period. The nature and number of these deliverables varies according to the output category, with some being linked directly to our allowed revenue, some
linked to legislation, and others having only a reputational impact. Ofgem, using information submitted by us along with independent assessments, determines the efficient level of expected costs necessary to deliver them. Under RIIO this is known as
totex, short for total expenditure, and is similar to the sum of controllable opex, capex and repex (for Gas Distribution) under the previous price control. A number of assumptions are necessary in setting these outputs such as certain prices or the volumes of work that will be needed. As a
result, to protect us and our customers from windfall gains and losses, there are a number of uncertainty mechanisms within the RIIO framework that can result in adjustments to totex if actual prices or volumes differ from the assumptions. Where we under- or over-spend the allowed totex for reasons that are not covered by uncertainty mechanisms, there is a sharing factor,
ie the under- or over-spend is shared between us and customers through an adjustment to allowed revenues in a future year. This sharing factor provides an incentive for us to provide the outputs efficiently as we are able to keep a
portion of the savings, with the remainder benefiting our customers.
 This sharing factor is one of the ways that RIIO has given innovation more prominence. Innovation
includes traditional areas such as new technologies, as well as the broader challenge of finding new ways of working to deliver outputs more efficiently. This broader challenge will have an impact on everyone in our business and we
have updated our strategy to reflect this new way of thinking. Totex is then split between fast and slow money, a new
concept under RIIO, based on a specified percentage. Fast money represents the amount of totex that we are able to recover in the current year. Slow money is added to our RAV. In addition to fast money, in each year we are allowed to collect a depreciation of and a return on our RAV. This operates in a similar way
to the previous price control, although there have been changes to the asset life (electricity transmission) and depreciation calculation (Gas Distribution) for some of our businesses. We are also allowed to collect additional revenues related to
non-controllable costs and incentives. The incentive mechanisms can increase or decrease our allowed revenue and result from our
performance against various measures related to our outputs. RIIO has introduced new incentive mechanisms as a way to provide further incentives to align our objectives with those of our customers and other stakeholders. For example,
performance against our customer satisfaction targets can have a positive or negative effect of up to 1% of allowed annual revenues. Incentives will normally affect our revenues two years after the year of performance. LOGO Key financial metrics Some of the key financial metrics are included below:  Transmission




Gas DistributionGas


ElectricityCost of equity (post-tax real)


6.8%



7.0%





6.7%Cost of debt (pre-tax real)


iBoxx 10 year simple trailingaverage index (2.92% for 2013/14)Notional gearing


62.5%



60.0%





65.0%Implied vanilla WACC*


4.4%



4.6%





4.2%  *
Implied vanilla WACC = cost of debt x gearing + cost of equity x (1  gearing)


LOGO






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Additional Information

Additional information

Business information in detail

Continued



Gas transmission

Electricity transmission

Gas DistributionTransmission
Operator

SystemOperator

TransmissionOperator

SystemOperator

North
West

East ofEngland

WestMidlands

London1    Fast

Baseline 35.6%

62.60%

15.00%

72.10%

Repex:

Stepped decline from 50% in 2013/14 to 0% in 2020/21 in seven equal instalments of
7.14% per annumUncertainty 10%




73.90%



73.37%

75.05%

76.53%2    Slow

Baseline 64.4%

37.40%

85.00%

27.90%

Repex:

Stepped increase from 50% in 2013/14 to 100% in 2020/21 in seven equal instalments
of 7.14% per annumUncertainty 90%




26.10%



26.63%

24.95%

23.47%3    Sharing

44.36%

46.89%

63.04%  For more information on RIIO, including incentive mechanisms, please see the relevant investor fact
sheets on the Investor Relations section of our website. US regulation Regulators In the US, public
utilities retail transactions are regulated by state utility commissions, including the NYPSC, the MADPU and the RIPUC. Utility commissions serve as economic regulators in approving cost recovery and authorised rates of return. The state commissions establish the
retail rates to recover the cost of transmission and distribution services, and focus on services and costs within their jurisdictions. FERC regulates the wholesale transactions of public utilities, such as interstate transmission and electricity
generation, and provides for the cost recovery of these services. Utility commissions are also charged with serving the public
interest by ensuring utilities provide safe and reliable service at just and reasonable prices. They establish service standards and approve mergers and acquisitions of public utilities. FERC also regulates public utility holding companies and
centralised service companies, including those of our US businesses. All the states in which we operate have deregulated the commodity
or supply component of electricity and gas utility services. Customers in deregulated states have the option to purchase electricity or gas services from competitive suppliers. Regulatory process Utilities in
the US submit a formal rate filing to the relevant state regulatory body, requesting a revenue adjustment in a proceeding known as a rate case. The rate case process is conducted in a litigated setting and, in the states in which we operate, it can take six to 13 months for the commission to render a final decision. In all states, the utility is required to prove that its
requested rate change is prudent and reasonable. The utility may request a rate plan that can span multiple years. Unlike the state processes, the federal regulator has no specified timeline for adjudicating a rate case, but typically
makes a final decision retroactive when the case is completed. During the rate case process, consumer advocates and other
intervening parties scrutinise and often file opposing positions to the utilitys rate request. The rate case decision reflects a weighing of the facts in light of the regulators policy objectives. During a rate case, the utility, consumer advocates and intervening parties may agree on the resolution of aspects of a case and file
 a negotiated settlement with a commission for approval. Gas and electricity rates are established from a revenue requirement, or cost of service, representing the utilitys total cost of providing
distribution or delivery service to its customers. It includes operating expenses, depreciation, taxes and a fair and reasonable return on certain components of the utilitys regulated asset base, typically referred to as its rate base. The rate of return applied to the rate base is the utilitys weighted average cost of capital. This represents its cost of debt
and an allowed ROE intended to provide the utility with an opportunity to attract capital from investors and maintain its financial integrity. The total cost of service is apportioned among different customer classes and categories of service
to establish the rates, through a process called rate design, for these classes of customers. The final cost of service and rate design are ultimately approved in the rate case decision. The revenue requirement is derived from a comprehensive study of the utilitys total costs during a recent 12 month period of operations,
referred to as a test year. Each commission has its own rules and standards for adjustments to the test year. These are intended to
arrive at the total costs expected in the first year new rates will be in effect, or the rate year, and may include forecast capital investments in determining rate year rate base. Often, known and measurable adjustments are made to test year
data to reflect normal operating conditions. In Massachusetts, only limited adjustments to this test year are allowed, which are required to be both known and measurable. New York and Rhode Island allow more comprehensive adjustments to the test
year. In summary, the US regulatory regime is based on a building block approach intended to allow the utility to recover its cost of service and earn a return on its investments. LOGO








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Our rate plans We have four sets of electricity rates and six sets of gas rates, covering our electricity distribution operations in upstate New York,
Massachusetts, and Rhode Island, and our gas distribution networks in upstate New York, New York City, Long Island, Massachusetts, and Rhode Island. Distribution and transmission electricity services in upstate New York continue to be subject
to a combined rate that is billed to end use customers. In New England, retail transmission rates reflect the recovery from our end use customers of wholesale transmission charges assessed to our electricity distribution companies. Wholesale
rates for our electricity transmission network in New England and New York and our Long Island generation rates are subject to FERC approval. Our rate plans are designed to produce a specific allowed ROE, by reference to an allowed operating expense level and rate base. Some rate plans include earnings sharing mechanisms that allow us to retain a proportion of the
earnings above our allowed ROE we achieve through improving efficiency, with the balance benefiting customers. In addition, our
performance under certain rate plans is subject to service performance targets. We may be subject to monetary penalties in cases where we do not meet those targets. Allowed ROE in context One
measure used to monitor the performance of our regulated businesses is a comparison of achieved ROE to allowed ROE, with a target that the achieved should be equal to or above the allowed. This measure cannot be used in isolation, however, as there
are a number of factors that may prevent us from achieving that target in any given year:  

Regulatory lag:in the years following the rate year, costs may increase due to inflation or other factors. If the cost increases cannot be offset by productivity
gains, the total cost to deliver will be higher as a proportion of revenue and therefore achieved ROE will be lowered. 

Cost disallowances:a cost disallowance is a decision by the regulator that a certain expense should not be recovered in rates from customers. The regulator may do this
for a variety of reasons. We can respond to some disallowances by choosing not to incur those costs; others may be unavoidable. As a result, unless offsetting cost reductions can be found, the achieved ROE will be lowered. 

Market conditions:if a utility files a new rate case, the new allowed ROE may be below the current allowed ROE as financial market conditions may have changed. As
such, a utility that appears to be underperforming the allowed ROE and files a new rate case may not succeed in increasing revenues. We work to increase achieved ROEs through: productivity improvements; positive performance against incentives or earned savings mechanisms such as
energy efficiency programmes, where available; and, through filing a new rate case when achieved returns are lower than that which the Company could reasonably expect to attain through a new rate case. Features of our rate plans We
are responsible for billing our customers for their use of electricity and gas services. Customer bills typically comprise a commodity charge, covering the cost of the electricity or gas delivered, and charges covering our delivery service.
Depending on the state, delivery rates are either based upon actual sales volumes and costs incurred in an historical test year, or on estimates of sales volumes and costs, and in both cases may differ from actual amounts. A substantial proportion
of our costs,
 in particular electricity and gas purchases for supply to customers, are pass-through costs, meaning they are fully recoverable from our customers. These pass-through costs are recovered
through separate charges to customers that are designed to recover those costs with no profit. Rates are adjusted from time to time to ensure any over- or under-recovery of these costs is returned to, or recovered from, our customers. There can
be timing differences between costs being incurred and rates being adjusted. Revenue for our wholesale transmission businesses in New
England and New York is collected from wholesale transmission customers, who are typically other utilities and include our own New England electricity distribution businesses. With the exception of upstate New York, which continues to combine
retail transmission and distribution rates to end use customers, these wholesale transmission costs are incurred by distribution utilities on behalf of their customers and are fully recovered as a pass-through from end use customers as
approved by each state commission. Our Long Island generation plants sell capacity to LIPA under a power supply agreement, approved by FERC, which provides a similar economic effect to cost of service rate regulation. US regulatory filings The
objectives of our rate case filings are to ensure we have the right cost of service with the ability to earn a fair and reasonable rate of return, while providing a safe and reliable service to our customers. In order to achieve these objectives and
to reduce regulatory lag, we have been requesting structural changes, such as revenue decoupling mechanisms, capital trackers, commodity related bad debt true ups, and pension and other post-employment benefit (OPEB) true ups, separately from base
rates. These terms are explained below the table on page 175. The following chart shows the progress we have made on these regulatory principles. We continue to work towards implementing these regulatory principles across our US business. LOGO


LOGO






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Additional Information

Additional information

Business information in detail

Continued



Although many of our rate plans feature revenue decoupling, in some cases decoupling applies
only to some classes of customer. As a result, the proportion of revenues which is decoupled is 92% for our electricity businesses and 64% for our gas businesses for 2012/13. Transmission and generation revenue is effectively decoupled. Below we summarise significant developments in rate filings during the year. New York Upstate New
York 2012 rate plan filing On 27 April 2012, we filed a rate plan filing for our upstate New York electricity and gas
businesses. On 31 October, the Company filed a term sheet reflecting the provisions of a proposed three year settlement agreement in respect of new rates. The Commission issued the final written order on 15 March 2013. The new rate plan provides an increase in electricity delivery revenue of $43.4 million, $51.4 million, and $28.3 million for rate years one to
three respectively. For the gas operations, the rate plan provides a decrease in delivery revenue of $3.3 million in rate year one and an increase of $5.9 million and $6.3 million in rate years two and three respectively. The revenue requirements
for Niagara Mohawks electricity and gas businesses are based on a ROE of 9.3%, which includes a stay out premium for the three year term, and a capital structure that includes a 48% common equity component. The final agreement also includes
annual reconciliation mechanisms for certain non-controllable costs. New rates became effective on 1 April 2013. Downstate New
York rate plan extension In November 2012, The Brooklyn Union Gas Company (also known as KeySpan Energy Delivery New York or
KEDNY) and the staff of the NYPSC entered into confidential discussions around the potential for extending and updating aspects of the five year rate agreement which ended on 31 December 2012. National Grid and the Department of Public Service Staff filed a term sheet with the Commission on 15 January 2013 and a Joint Proposal
formalising the settlement was filed on 22 February 2013. The proposed settlement is not expected to materially affect customer bills or KEDNYs revenues over the period of the rate agreement. The proposed two year agreement for
extending and modifying elements of the original KEDNY five year rate plan includes a 9.4% ROE in each of the two years 2013 and 2014, with a 48% equity structure, which is financially equivalent to the terms of the original five year
rate plan (9.8% ROE and 45% equity structure). Under the proposed agreement, 80% of any earnings over 9.4% will be allocated to fund recovery of prior environmental deferrals with the remaining 20% being retained by KEDNY. The proposed
agreement also includes an increase in capital expenditure allowances to $320.1 million in 2013 and $293.7 million in 2014 as compared with the original rate plan capital allowances of $155.4 million per year. The agreement also proposes
updates to various customer service and other performance metrics. Under the proposed agreement, there is no impact on the delivery rates for customers. Long Island LIPA power supply agreement (PSA) National Grid owns and manages a number of power plants on Long Island, with a generation capacity of 3.8 GW. We have been supplying electricity
to communities and businesses across Long Island under an agreement with LIPA that was set to expire in May 2013.
 On 2 October 2012, National Grid and LIPA agreed to amend and restate their existing PSA for
15 years expiring on 30 April 2028 subject to LIPAs option to terminate the agreement as early as 30 April 2025 upon two years advance notice. The amended and restated PSA was filed on 22 March 2013 with FERC,
commencing a 60 day waiting period. The agreement contains a pricing formula similar to the current PSA, at rates approved by
FERC. The agreement resulted in a rate decrease of $27.4 million annually compared with the 1998 PSA. The new agreement sets a ROE of 9.75% and a capital structure with an equity component of 50%. The PSA continues certain annual rate
adjustments, such as pension and other post-retirement benefit expenses, property tax true up, adjustments for new plant in service, and certain inflationary increases. The new PSA allows both parties a ROE reopener in contract years four to
six and National Grid a one time rate reopener after contract year six. The new agreement also gives National Grid and LIPA new
options for updating and modernising the power plants through retiring, or repowering, existing facilities while reducing energy costs and improving environmental performance. Rhode Island Rhode
Island 2012 rate plan filing On 27 April 2012, we filed a new rate plan for our Rhode Island electricity and gas businesses,
to take effect from 1 February 2013. At an open meeting on 20 December 2012, RIPUC approved the rate case settlement. The
new rate plans include a 9.5% allowed ROE, a 49% equity portion in the assumed capital structure, pension trackers and increased operating cost allowances compared with the current rate plans. The new rate plans provide for a revenue
increase of $20.9 million for electricity operations and $10.9 million for gas operations. They also provide for an annual property tax recovery mechanism included in the Companys annual capital programme that more closely
aligns rate recovery and costs related to property tax expenses. A written order was issued by the Commission on 31 January 2013 and new rates became effective on 1 February 2013. Complaint on transmission allowed ROE In September 2011 and December 2012 complaints were filed with FERC against certain transmission owners, including our New England transmission business, to lower the base ROE from the FERC approved rate of 11.14% to 9.2% and
8.7% respectively. The transmission owners, including National Grid, have filed a response arguing that the complainants have not proven that the existing rate is unjust and unreasonable and that the 11.14% base ROE should be allowed to
continue. The matters are ongoing. Overland audit In January 2013, the NYPSC published the results of an audit of National Grids New York state regulated business by Overland, a consultancy
commissioned by the NYPSC in 2010/11. The report recommended a number of actions, many of which have already been implemented as a result of the Liberty audit which the Company commissioned at around the same time. National Grid has presented a plan
to the NYPSC to address the outstanding recommendations and is analysing the audit findings with the NYPSC to determine any potential impact on historical customer bills.








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LOGO   Revenue decoupling A mechanism that removes the link
between a utilitys revenue and sales volume so that the utility is indifferent to changes in usage. Revenues are reconciled to a revenue target, with differences billed or credited to customers. Allows the utility
to support energy efficiency. Capital tracker A mechanism that allows for the recovery
of the revenue requirement of incremental capital investment above that embedded in base rates, including depreciation, property taxes and a return on the incremental investment.
 §Commodity related bad debt true up A mechanism that allows a utility to reconcile commodity related bad debt to either actual commodity related bad debt or to a
specified commodity related bad debt write-off percentage. For electricity utilities, this mechanism also includes working capital.  ̧Pension/OPEB true up A mechanism that reconciles the actual non capitalised costs of pension and OPEB and the actual amount recovered in base rates. The
difference may be amortised and recovered over a period or deferred for a future rate case.


LOGO






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Additional Information

Additional information

Business information in detail

Continued



Risk factors Our risk management process has identified the following risk factors that could have a material adverse effect on our business, financial
condition, results of operations and reputation, as well as the value and liquidity of our securities. Any investment decision regarding our securities and any forward-looking statements made by us should be considered in the light of these risk
factors and the cautionary statement set out on the back cover.  Potentially harmful activitiesAspects of the work we do could potentially harm employees, contractors,
members of the public or the environment.  Potentially hazardous
activities that arise in connection with our business include the operation and maintenance of electricity generation facilities, electricity lines and substations and the storage, transmission and distribution of gas. We are subject to laws
and regulations in the UK and US governing health and safety matters to protect the public and our employees, who could potentially be harmed by these activities. Electricity and gas utilities also typically use and generate hazardous and
potentially hazardous products and by-products. In addition, there may be other aspects of our operations that are not currently regarded or proved to have adverse effects but could become so, such as the effects of electric and magnetic
fields.  We are subject to laws and regulations relating to
pollution, the protection of the environment, and the use and disposal of hazardous substances and waste materials. These expose us to costs and liabilities relating to our operations and properties whether current, including those
inherited from predecessor bodies, or formerly owned by us, and sites used for the disposal of our waste. The cost of future environmental remediation obligations is often inherently difficult to estimate and uncertainties can include the extent of
contamination, the appropriate corrective actions and our share of the liability. We are increasingly subject to regulation in relation to climate change and are affected by requirements to reduce our own carbon emissions as well as reduction in
energy use by our customers.

We commit significant expenditure to complying with these laws and regulations and to meeting our obligations under negotiated
settlements. If more onerous requirements are imposed or our ability to recover these costs under regulatory frameworks changes, this could have a material adverse impact on our businesses, reputation, results of operations and financial
position. Furthermore, any breach of our regulatory or contractual obligations or our climate change targets, or even incidents that do not amount to a breach, could materially adversely affect our results of operations and our
reputation.  For more information about environmental, climate
change and health and safety matters relating to our businesses, see the corporate responsibility section of our website.  Infrastructure and IT systemsWe may suffer a major network failure or interruption, or may
not be able to carry out critical non network operations. 
Operational performance could be materially adversely affected by a failure to maintain the health of the system or network, inadequate
forecasting of demand, inadequate record keeping or control of data or failure of information systems and supporting technology. This could cause us to fail to meet agreed standards of service, incentive and reliability targets, or be in breach
of a licence, approval, regulatory requirement or contractual obligation. Even incidents that do not amount to a breach could result in adverse regulatory and financial consequences, as well as harming our reputation.
 In addition to these risks, we may be affected by other potential events that
are largely outside our control such as the impact of weather (including as a result of climate change and major storms such as Superstorm Sandy), unlawful or unintentional acts of third parties, insufficient or unreliable supply or force
majeure. Weather conditions can affect financial performance and severe weather that causes outages or damages infrastructure together with our actual or perceived response will materially adversely affect operational and potentially business
performance and our reputation.

Malicious attack, sabotage or other intentional acts, including breaches of our cyber security, may also damage
our assets or otherwise significantly affect corporate activities and, as a consequence, have a material adverse impact on our business, results of operations and financial condition. Unauthorised access to, or deliberate breaches of, our
IT systems may also seek to access and manipulate our proprietary business data or customer information. Unauthorised access to private customer information may make us liable for a violation of data privacy regulations.
 Even where we establish business continuity controls and security against
threats against our systems, these may not be sufficient.








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Law and regulationChanges in law or regulation or decisions by governmental bodies or
regulators could materially adversely affect us.  Most of our
businesses are utilities or networks subject to regulation by governments and other authorities. Changes in law or regulation or regulatory policy and precedent, including decisions of governmental bodies or regulators, in the countries
or states in which we operate could materially adversely affect us.  Decisions or rulings concerning, for example: (i) whether licences,
approvals or agreements to operate or supply are granted, amended or renewed, whether consents for construction projects are granted in a timely manner or whether there has been any breach of the terms of a licence, approval or regulatory
requirement; and

(ii)  timely recovery of incurred expenditure or obligations, the
ability to pass through commodity costs, a decoupling of energy usage and revenue, and other decisions relating to the impact of general economic conditions on us, our markets and customers, implications of climate change, whether aspects
of our activities are contestable, the level of permitted revenues and dividend distributions for our businesses and in relation to proposed business development activities, could have a material adverse impact on our results of
operations, cash flows, the financial condition of our businesses and the ability to develop those businesses in the future. 
For further information see pages 170 to 175 which explain our regulatory environment in detail.  Business performanceCurrent and future business performance may not meet our expectations or
those of our shareholders.  Earnings maintenance and growth from
our regulated gas and electricity businesses will be affected by our ability to meet or exceed efficiency targets and service quality standards set by, or agreed with, our regulators. In addition, from time to time we publish cost and efficiency
savings targets for our businesses.

If we do not meet these targets and standards, or if we do not implement the transformation projects we are carrying out as
envisaged (including the US foundation programme), or are not able to shape our operating model to deliver success under RIIO, we may not achieve the expected benefits, our business may be materially adversely affected and our performance,
results of operations and reputation may be materially harmed and we may be in breach of regulatory or contractual obligations.  Business development activityNew businesses or activities that we undertake alone or with partners
may not deliver target outcomes and may expose us to additional operational and financial risk. 
Business development activities, including acquisitions, disposals, joint ventures and organic investment opportunities (including organic
investments made as a result of changes to the energy mix), entail a number of risks, including that they may be based on incorrect assumptions or conclusions, failure to realise planned levels of synergy and efficiency savings, the inability to
integrate acquired businesses effectively and we may suffer unanticipated costs and liabilities and other unanticipated effects.

We may also be liable for the past acts, omissions or liabilities of companies or businesses we have acquired, which may be unforeseen or greater than
anticipated. In the case of joint ventures, we may have limited control over operations and our joint venture partners may have interests that diverge from our own. The occurrence of any of these events could have a material adverse impact
on our results of operations or financial condition, and could also impact our ability to enter into other transactions.  Cost escalationChanges in foreign currency rates,
interest rates or commodity prices could materially impact earnings or our financial condition. 
We have significant operations in the US and so are subject to the exchange rate risks normally associated with non UK operations, including
the need to translate US assets and liabilities, and income and expenses, into sterling, our primary reporting currency. In addition, our results of operations and net debt position may be affected because a significant proportion of our borrowings,
derivative financial instruments and

commodity contracts are affected by changes in interest rates, commodity price
indices and exchange rates, in particular the dollar to sterling exchange rate.  Furthermore, our cash flow may be materially affected as a result of settling hedging arrangements entered into to manage our exchange rate, interest rate and commodity price exposure, or by cash collateral
movements relating to derivative market values, which also depend on the sterling exchange rate into euro and other currencies.Operating costs may increase faster than revenues.
 Income under our price controls in the UK is linked to the RPI.
Our operating costs may increase without a corresponding increase in the RPI and therefore without a corresponding increase in UK revenues. Our income under our rate plans in the US is not typically linked to inflation.

In periods of inflation in the US, our operating costs may increase by more than our revenues. In both the UK and US such increased costs may materially adversely
affect our results of operations.


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Additional Information

Additional information

Business information in detail

Continued



Cost escalation continuedWe may be required to make significant contributions to fund pension and other post-retirement benefits. 
We participate in a number of pension schemes that together cover substantially all our employees. In both the UK and US, the principal schemes
are defined benefit schemes where the scheme assets are held independently of our own financial resources. In the US, we also have other post-retirement benefit schemes. Estimates of the amount and timing of future funding for the UK and US schemes
are based on actuarial assumptions and other factors including: the actual and projected market

performance of the scheme assets, future
long-term bond yields, average life expectancies and relevant legal requirements.  Actual performance of scheme assets may be affected by volatility in debt and equity markets, exacerbated by the eurozone crisis. Changes in these assumptions or other factors may require us to make additional contributions to these
pension schemes which, to the extent they are not recoverable under our price controls or state rate plans, could materially adversely affect our results of operations and financial condition.  Financing and liquidityAn inability to access capital markets at commercially acceptable interest rates could affect how we maintain and grow our businesses.
 Our businesses are financed through cash generated from our ongoing
operations, bank lending facilities and the capital markets, particularly the long-term debt capital markets. Some of the debt we issue is rated by credit rating agencies and changes to these ratings may affect both our borrowing capacity and
borrowing costs. In addition, restrictions imposed by regulators may also limit how we service the financial requirements of our current businesses or the financing of newly acquired or developing businesses.
 Financial markets can be subject to periods of volatility and shortages of
liquidity, which may be exacerbated by the eurozone crisis. If we were unable to access the capital markets or other sources of finance at competitive rates for a prolonged period, our cost of financing may increase, the discretionary and
uncommitted elements of our proposed capital investment programme may need to be reconsidered and the manner in which we implement our strategy may need to be reassessed.
 Such events could have a material adverse impact on our business, results of
operations and prospects.

Some of our regulatory agreements impose
lower limits for the long-term senior unsecured debt credit ratings that certain companies within the group must hold or the amount of equity within their capital structures. One of the principal limits requires National Grid plc to hold an
investment grade long-term senior unsecured debt credit rating. In addition, some of our regulatory arrangements impose restrictions on the way we can operate. These include regulatory requirements for us to maintain adequate financial
resources within certain parts of our operating businesses and may restrict the ability of National Grid plc and some of our subsidiaries to engage in certain transactions, including paying dividends, lending cash and levying charges. The inability
to meet such requirements or the occurrence of any such restrictions may have a material adverse impact on our business and financial condition.Our debt agreements and banking
facilities contain covenants, including those relating to the periodic and timely provision of financial information by the issuing entity and financial covenants such as restrictions on the level of subsidiary indebtedness. Failure to comply with
these covenants, or to obtain waivers of those requirements, could in some cases trigger a right, at the lenders discretion, to require repayment of some of our debt and may restrict our ability to draw upon our facilities or access the
capital markets.  Customers and counterpartiesCustomers and counterparties may not perform their obligations.  Our operations are exposed to the risk that customers, suppliers, financial institutions and others with whom we do business will not satisfy their obligations, which could materially adversely affect our financial
position.

This risk is most significant where our
subsidiaries have concentrations of receivables from gas and electricity utilities and their affiliates (such as the Long Island Power Authority), as well as industrial customers and other purchasers, and may also arise where customers are
unable to pay us as a result of increasing commodity prices or adverse economic conditions.  Employees and othersWe may fail to attract, develop and retain employees with the competencies, values and behaviours required to deliver our strategy and vision and ensure they are engaged to act in our best interests.
 Our ability to implement our strategy depends on the capabilities and
performance of our employees and leadership. Our ability to implement our strategy and vision may be negatively affected by the loss of key personnel or an inability to attract, develop or retain appropriately qualified personnel (in particular
for technical

positions where availability
of appropriately qualified personnel may be limited), or if significant disputes arise with our employees. As a result, there may be a material adverse effect on our business, financial condition, results of operations and prospects.
 There is a risk that an employee or someone acting on our behalf may breach
our internal controls or internal governance framework or may contravene applicable laws and regulations. This could have an impact on our results of operations, our reputation and our relationship with our regulators and other
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Additional information Internal control   Information assurance The Board considers that it is imperative to have accurate and reliable information to enable informed and timely decisions to be taken that
further our objectives. Key elements in managing information assurance risks include education, training and awareness. These
initiatives emphasise the importance of information security, the quality of data collection and the affirmation process that supports our business transactions, evidencing our decisions and actions. All communication channels, including
training for doing the right thing, make it clear that the accurate and honest reporting of data and other information must never be compromised. These initiatives are supported by the letter of assurance process in which managers
affirm, among other things, they have control frameworks in place to assist in the accurate reporting of data and other information. In line with ongoing transformation initiatives, we continue to monitor and evolve our control processes. Disclosure controls Working with management, including the Chief Executive and Finance Director, we have evaluated the effectiveness of the design and operation of
our disclosure controls and procedures as at 31 March 2013. Our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives, however the effectiveness of any system of disclosure controls and
procedures has limitations including the possibility of human error and the circumvention or overriding of the controls and procedures. Even effective disclosure controls and procedures provide only reasonable assurance of achieving their
objectives. Based on the evaluation, the Chief Executive and Finance Director concluded that the disclosure controls and procedures are effective to provide reasonable assurance that information required to be disclosed in the reports that
we file and submit under the Exchange Act is recorded, processed, summarised and reported as and when required and that such information is accumulated and communicated to our management, including the Chief Executive and
Finance Director, as appropriate, to allow timely decisions regarding disclosure. Internal control over
financial reporting Our management, including the Chief Executive and Finance Director, has carried out an evaluation of our internal
control over financial reporting pursuant to the Disclosure and Transparency Rules and Section 404 of the Sarbanes-Oxley Act 2002. As required by Section 404, management is responsible for establishing and maintaining an adequate system of
internal control over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act). Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial
reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Because of its inherent limitations, internal control over financial reporting may not prevent or detect
misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may
deteriorate.
 Management evaluation of the effectiveness of the Companys internal control over financial
reporting was based on the Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. Based on this evaluation, management concluded that our internal control over financial reporting
was effective as at 31 March 2013. PricewaterhouseCoopers LLP, which has audited our consolidated financial statements for
the year ended 31 March 2013, has also audited the effectiveness of our internal control over financial reporting. Their attestation report can be found on page 95. Changes to internal control over financial reporting During November and December 2012 our new US enterprise resource planning system went live, implementing a new platform to replace a number of
legacy systems across our US businesses. The primary reason for the systems change is to provide the US businesses with an
integrated platform that allows for process and systems standardisation and efficiencies. The changes were not undertaken in response to any actual or perceived deficiencies in our internal control over financial reporting. The implementation
of the new platform, and associated changes to many financial processes across our US businesses, has resulted in material changes to our internal controls over financial reporting (as defined in Rules 13a-15(f) and 15d-15(f) under the Exchange
Act). We regularly review our internal controls over financial reporting as well as our disclosure controls and procedures and make
changes, as necessary, to ensure the quality of our financial reporting. Other than the changes related to the new system there have been no changes in internal control over financial reporting during the year that have materially affected, or are
reasonably likely to materially affect, our internal control over financial reporting.


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Additional Information Additional information Directors Report disclosures   Articles of Association A summary of the material terms of our Articles of Association (the Articles) and applicable English Law is set out on pages 184 and 185. Board biographies Sir Peter Gershon CBE FREng, Chairman Appointment to the Board: August 2011 as Deputy Chairman, Chairman with effect from January 2012 Committee
membership: N (ch) Previous appointments: Chairman of Premier Farnell plc, Chief Executive of the Office of Government
Commerce, Managing Director of Marconi Electronic Systems and member of the UK Defence Academy Advisory Board. External
appointments: Chairman of Tate & Lyle plc and member of the HM Government Efficiency and Reform Board and The Sutton Trust Board. Experience: 

Chairman 

Engineer 

Government 

Partnering/JV/contract management 

City 

High tech industry 

US 

International 

General management Steve Holliday FREng, Chief Executive Appointment to the Board: October 2002, appointed to National Grid Group plc 2001, Chief Executive with effect from
January 2007 Committee membership: F Previous appointments: Executive Director of British Borneo Oil and Gas; he also spent 19 years within the Exxon Group, where he held
senior positions in the international gas business and managed major operational areas such as refining and shipping. Most recently Chairman of UK Business Council for Sustainable Energy and the Technician Council. External appointments: Non-executive Director of Marks and Spencer Group plc, Chairman of Crisis UK, the Princes National Ambassador,
Trustee Director for Business in the Community and member of Infrastructure UK Advisory Council. Experience: 

Chief Executive 

Engineer 

Government/regulatory 

Partnering/JV/contract management 

City 

Utilities  energy 

Customer 

Oil and gas 

US 

International
 Philip Aiken, Non-executive Director Appointment to the Board: May 2008 Committee membership: A, N, S (ch) Previous appointments: Group President of BHP Billitons Energy
business, Executive Director of BTR plc, held senior roles in BOC Group plc, senior advisor to Macquarie Capital (Europe) Limited, Chairman of Robert Walters plc and Non-executive Director of Miclyn Express Offshore Limited. External appointments: Chairman of AVEVA Group plc, Non-executive and Senior Independent Director of Kazakhmys PLC and Essar Energy plc and
Non-executive Director of Essar Oil Limited and Newcrest Mining Limited. Experience: 

Chairman 

Partnering/JV/contract management 

Emerging markets 

Natural resources 

International Andrew Bonfield, Finance Director Appointment to the Board: November 2010 Committee membership: F Previous appointments: Chief Financial Officer at Cadbury plc until March 2010;
he also spent five years as Executive Vice President & Chief Financial Officer of Bristol-Myers Squibb Company and has previous experience in the energy sector as Finance Director of BG Group plc. External appointments: Non-executive Director of Kingfisher plc. Experience: 

Finance Director 

Accountant 

Government/regulatory 

Partnering/JV/contract management 

City 

Utilities  energy 

Customer 

US 

International Nora Mead Brownell, Non-executive Director Appointment to the Board: 1 June 2012 Committee membership: N, R, S Previous appointments: Commissioner of the Pennsylvania Public Utility Commission from 1997 to 2001, Commissioner for the Federal Energy Regulatory Commission from 2001 to 2006 and former President of the National Association
of Regulatory Utility Commissioners. External appointments: Board member of Comverge, Inc., Spectra Energy Partners LP and
ONCOR Electric Delivery Holding Company LLC and partner in ESPY Energy Solutions, LLC. Experience: 

US Government/regulatory 

US utilities  energy 

FERC 

Various non-executive directorships 

US








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Jonathan Dawson, Non-executive Director Appointment to the Board: 4 March 2013 Committee membership: F, N, R Previous appointments: Various roles within the Ministry of Defence
before joining Lazard where he spent over 20 years. Non-executive Director of Galliford Try plc 2004 to 2008, National Australia Group Europe Limited 2005 to 2012 and Standard Life Investments (Holdings) Limited 2010 to 2013. External appointments: Non-executive and Senior Independent Director of Next plc, Non-executive Director of Jardine Lloyd Thompson Group
plc and co-founding partner in Penfida Partners LLP. Experience: 

City 

Corporate finance 

Banking 

Pensions Paul Golby CBE FREng, Non-executive Director Appointment to the Board: February 2012 Committee membership: N, R, S Previous appointments: Executive Director of Clayhithe plc before joining East Midlands Electricity plc in 1998 as Managing Director, Chief Executive of E.ON UK plc in 2002, and later additionally as Chairman, stepping down
from the E.ON board in December 2011 and most recently Non-executive Chairman of AEA Technology Group plc. External
appointments: Chairman of EngineeringUK, Chair of the Engineering and Physical Sciences Research Council and a member of the Council for Science and Technology. Experience: 

Chairman and chief executive 

Engineer 

Government/regulatory 

City 

Utilities  energy Ken Harvey CBE, Non-executive Director
and Senior Independent Director Appointment to the Board: October 2002, appointed to Lattice Group plc board in 2000,
Senior Independent Director with effect from October 2004 Committee membership: N, R (ch), S Previous appointments: Engineering Director and then Deputy Chairman of London Electricity and Chairman and Chief Executive of NORWEB plc. External appointments: Chairman of Pennon Group Plc. Experience: 

Chairman and chief executive 

Engineer 

Government/regulatory 

City 

Utilities  power and water
 Ruth Kelly, Non-executive Director Appointment to the Board: October 2011 Committee membership: A, F, N Previous appointments: Various senior roles in Government from 2001
to 2008, including Secretary of State for Transport, Secretary of State for Communities and Local Government, Secretary of State for Education and Skills and Financial Secretary to the Treasury. External appointments: Managing Director at HSBC and Governor for the National Institute of Economic and Social Research. Experience: 

Government/regulatory 

Partnering/JV/contract management 

Financial and economic 

Infrastructure projects Tom King, Executive Director, US Appointment to the Board: August 2007 Previous appointments: President of PG&E Corporation and Chairman and CEO of Pacific Gas and Electric Company from 2003 to 2007, having
held a number of senior positions within the PG&E group since joining in 1998. Senior management positions with Kinder Morgan Energy Partners and Enron Corporation. Experience: 

Government/regulatory 

Partnering/JV/contract management 

Utilities  energy 

Customer 

FERC 

Generation 

US Maria Richter, Non-executive Director Appointment to the Board: October 2003 Committee membership: A, F (ch), N Previous appointments: Morgan Stanley from 1993 to 2002, latterly as
Managing Director of its Corporate Finance Retail Group. Vice President of Independent Power Group for Salomon Brothers and Vice President of Prudential Capital Corporation and Power Funding Associates. Most recently Non-executive Director of The
Pantry, Inc. and The Vitec Group plc. External appointments: Non-executive Chairman of Pro Mujer UK and Non-executive Director
of The Bessemer Group, Inc. Experience: 

City 

Financial services 

Emerging markets 

US 

International


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Additional Information

Additional information

Directors Report disclosures

Continued



George Rose, Non-executive Director Appointment to the Board: October 2002, appointed to Lattice Group plc board in 2000 Committee membership: A (ch), N, R Previous appointments: Member of the Financial Reporting Review Panel, Non-executive Director of Orange plc and Saab AB and Finance Director of BAE Systems plc. External appointments: Member of the UK Industrial Development Advisory Board, Non-executive Director of Genel Energy plc, Laing
ORourke plc and Experian plc. Experience: 

Finance director 

Accountant 

Government/regulatory 

Partnering/JV/contract management 

City 

Defence industry 

US 

International Mark Williamson, Non-executive Director Appointment to the Board: 3 September 2012 Committee membership: A, F, N Previous appointments: Chief Accountant then Group Financial Controller of Simon Group plc before joining International Power plc as Group Financial Controller in 2000 and appointed as Chief Financial Officer in 2003. External appointments: Non-executive and Senior Independent Director of Alent plc, Deputy Chairman and Senior Independent
Director of Imperial Tobacco Group PLC. Experience: 

Finance director 

Accountant 

Government/regulatory 

City 

Utilities  energy 

International Nick Winser FREng, Executive Director, UK Appointment to the Board: April 2003 Previous appointments: Chief Operating Officer of the US transmission business for National Grid Transco plc having joined The National
Grid Company plc in 1993, becoming Director of Engineering in 2001. Prior to this, with Powergen since 1991 as principal negotiator on commercial matters. Most recently co-Chair of the Energy Research Partnership. External appointments: Non-executive Director of Kier Group plc and Chair of CIGRE UK. Experience: 

Engineer 

Government/regulatory 

Partnering/JV/contract management 

City 

Utilities  energy 

Customer 

US   KeyA

Audit CommitteeF

Finance CommitteeN

Nominations CommitteeR

Remuneration CommitteeS

Safety, Environment andHealth Committee(ch)

chairman of Committee
 Alison Kay, Group General Counsel & Company Secretary Appointment as Company Secretary: 24 January 2013 Previous appointments: Various roles since joining National Grid in 1996 including UK General Counsel and Company Secretary from 2000 to
2008 and Commercial Director, UK Transmission from 2008 to 2012. Capital Gains Tax (CGT) CGT information relating to National Grid shares for UK resident shareholders can be found on our website under Investors, Shareholder Services.
Share prices on specific dates can also be found on our website. Change of control provisions No compensation would be paid for loss of office of Directors on a change of control of the Company. As at 31 March 2013,
the Company had undrawn borrowing facilities with a number of its banks of £1.7 billion available to it and a further £1.3 billion of drawn bank loans which, on a change of control of the Company following a takeover bid, may alter or
terminate. All the Companys share plans contain provisions relating to a change of control. Outstanding awards and options would normally vest and become exercisable on a change of control, subject to the satisfaction of any performance
conditions at that time. In the event of a change of control of the Company a number of governmental and regulatory consents or approvals are likely to be required arising from laws or regulations of the UK, US or the EU. No other agreements that take effect, alter or terminate upon a change of control of the Company following a takeover bid are considered to be
significant in terms of their potential impact on the business as a whole. Charitable donations During 2012/13, approximately £15 million (2011/12: £16 million; 2010/11: £13 million) was invested in support
of community initiatives and relationships focusing on education and skills (£5 million), environment and energy (£7 million) and community development (£3 million). The London Benchmarking Group model was used to assess this
overall community investment. Direct donations to charitable organisations amounted to £2 million (2011/12: £4 million; 2010/11: £0.8 million), a proportion of which was donated via our employee community grant schemes which
support and encourage employee fundraising and volunteering. In addition to our donations, financial support was provided for our affordable warmth programme, education programme, university research and our young offenders programme. Conflicts of interest The Board continues to monitor and note possible conflicts of interest that each Director may have and Directors are reminded of their continuing obligations in relation to conflicts at each Board meeting. Potential
conflicts are considered and, if appropriate, approved and noted. During the year ended 31 March 2013, the Board has been advised by the Directors of two situations in relation to which an actual conflict of interest was identified.
In both circumstances the Board duly considered and authorised the conflicts in accordance with its powers as set out in the Articles, with the conflicted Director not voting on the matter or being counted in the quorum.








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Directors indemnity The Company has arranged, in accordance with the Companies Act 2006 and the Articles, qualifying third party indemnities against financial
exposure that Directors may incur in the course of their professional duties. Equivalent qualifying third party indemnities were, and remain, in force for the benefit of those Directors who stood down from the Board during the year
ended 31 March 2013. Alongside these indemnities, the Company places Directors and Officers liability insurance cover for each Director. Events after the reporting period There have been no material events affecting the Company since the year end. Material interests in shares As at 31 March 2013, National Grid had been notified of the following holdings in voting rights of 3% or more in the issued share capital of
the Company:  Number of


% ofordinary shares



voting rights*The Capital Group Companies,
Inc.


399,638,038



10.905Black Rock, Inc.


182,630,798



5.21Crescent Holding
GmbH


149,414,285



4.18Legal and General Group
plc


138,503,443



3.99  *
This number is calculated in relation to the issued share capital at the time the holding was disclosed On 5 April 2013, The Capital Group Companies, Inc. notified us of a holding in voting rights of 11.02%, 404,063,006 ordinary shares as at
3 April 2013. As at 15 May 2013, no further notifications have been received. The rights attached to ordinary shares are detailed below. All ordinary shares carry the same voting rights. Policy and practice on payment of creditors It is National Grids policy to include in contracts or other agreements terms of payment with suppliers. Once agreed, National Grid aims to
abide by these payment terms. The average creditor payment period at 31 March 2013 for National Grids principal operations in the UK was 25 days (22 days at 31 March 2012). National Grid is a signatory to the Prompt Payment
Code, which can be found at www.promptpaymentcode.org.uk. Political donations and expenditure National Grid made no political donations in the UK or EU during the year, including such donations as defined for the purposes of the
Political Parties, Elections and Referendums Act 2000. National Grid USA and certain of its subsidiaries made political donations in the US of $73,400 (£46,800) (2011/12: $99,900; 2010/11: $151,000) during the year to affiliated Federal
and New York state political action committees (PACs). National Grid USAs affiliated Federal and New York PACs were funded wholly by voluntary employee contributions.
 Research and development Expenditure on research and development during the year was £15 million (2011/12: £15 million; 2010/11: £16 million).
Examples included development of new technologies for enhancing the capacity of the electricity transmission network and research into extending the life and reducing emissions from gas transmission and distribution assets. Share capital The share capital of the Company consists of ordinary shares of 1117⁄43 pence nominal value each and ADSs, which represent five ordinary
shares. Authority to purchase shares Shareholder approval was given at the 2012 AGM to purchase up to 10% of the Companys share capital. The Directors intend to seek shareholder approval to renew this authority at this years AGM. In some circumstances,
companies may find it advantageous to purchase their own shares in the market. Repurchased shares may be held as treasury shares by the Company, and resold for cash, cancelled, either immediately or at some point in the future, or used for the
purposes of employee share schemes. The Directors believe that it is desirable for the Company to have such additional flexibility in the management of its capital base. The Company will only purchase shares where the Directors believe this
would be in the best interests of shareholders generally. The authority will only be used after careful consideration, taking into account market conditions prevailing at the time, other investment opportunities, appropriate gearing levels and the
overall financial position of the Company. No shares were repurchased during the year. Of the shares repurchased in prior years and held as treasury shares, 4,515,807 have been transferred to employees under the employee share plans leaving a
balance as at the date of this report of 127,142,880 ordinary shares held as treasury shares. Authority to allot shares Shareholder approval was given at the 2012 AGM to allot shares of up to 1⁄3 of the Companys share capital and a further 1⁄3 in connection with an offer by way of a rights issue. The Directors
intend to seek shareholder approval to renew this authority at this years AGM. The Directors currently have no intention of issuing new shares, or of granting rights to subscribe for or convert any security into shares, except in relation to,
or in connection with, our scrip dividend scheme and the exercise of options under our share plans. The Directors consider it desirable to have the maximum flexibility permitted by investor guidelines to respond to market developments. No issue of
shares will be made which would effectively alter control of the Company without the sanction of shareholders in general meeting. Rights attached to shares Ordinary shareholders and ADS holders receive dividends and can vote at general meetings. Treasury shares do not attract a vote or dividends.
There are no restrictions on the transfer or sale of ordinary shares. Some of the Companys employee share plans, details of which are contained in the Remuneration Report, include restrictions on the transfer of shares while the shares
are subject to the plan. Where, under an employee share plan operated by the Company, participants are the beneficial owners of the shares but not the registered owner, the voting rights may be exercised by the registered owner at the direction of
the participant.


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Additional Information Additional information Other disclosures  Articles of Association The following description is a summary of the material terms of our Articles and applicable English law. The following description is a summary
only and is qualified in its entirety by reference to the Articles. Summary The Articles set out the internal regulations of the Company and cover such matters as the rights of shareholders and the conduct of the
Board and general meetings. Copies are available upon request and are displayed on the Companys website. Amendments to the Articles have to be approved by at least 75% of those voting in person or by proxy at a general meeting of the
Company. Subject to company law and the Articles, the Directors may exercise all the powers of the Company, and may delegate authorities to committees and day-to-day management and decision-making to individual Executive Directors. The committee
structure is set out on pages 28 and 29. General The Company is incorporated under the name National Grid plc and is registered in England and Wales with registered number 4031152. Under the
Companies Act, the Companys objects are unrestricted. Directors Under the Articles, a Director must disclose any personal interest in a matter and may not vote in respect of that matter, subject to certain
limited exceptions. As permitted under the Companies Act, the Articles provide that the non conflicted Directors of the Company may authorise a conflict or potential conflict for a particular matter. In doing so, the non conflicted Directors must
act in a way they consider, in good faith, will be most likely to promote the success of the Company for the benefit of the shareholders as a whole. The Directors (other than a Director acting in an executive capacity) are paid fees for their services, which in total must not exceed £2,000,000 a year or any higher sum as decided by an ordinary resolution at a
general meeting of shareholders. In addition, special pay may be awarded to a Director who acts in an executive capacity, serves on a committee, performs services which the Directors consider to extend beyond the ordinary duties of a Director,
devotes special attention to the business of National Grid or goes or lives abroad on the Companys behalf. Directors may also receive reimbursement for expenses properly incurred, and may be awarded pensions and other benefits. The
compensation awarded to the Executive Directors is determined by the Remuneration Committee and further details of Directors remuneration are set out in the Remuneration Report (see pages 68 to 90). The Directors are empowered to exercise all the powers of National Grid to borrow money, subject to the limitation that the aggregate
principal amount of all borrowings of its group outstanding at any time must not exceed £35 billion or any other amount approved by shareholders by an ordinary resolution at a general meeting. Directors can be appointed or removed by the Board or shareholders in a general meeting. Directors must stand for election at the first AGM
following their appointment to the Board. Each Director must retire at least every three years but will be eligible for re-election. In accordance with best practice introduced by the UK Corporate Governance Code, all Directors wishing to continue
in office currently offer themselves for
 re-election annually. No person is disqualified from being a Director or is required to vacate that office by reason of attaining a maximum age. A Director is not required to hold shares in National Grid in order to qualify as a Director. Rights, preferences and restrictions (i) Dividend rights National Grid may not pay any dividend otherwise than out of profits available for distribution
under the Companies Act and other applicable provisions of English law. In addition, as a public company, National Grid may only make a distribution if, at the time of the distribution, the amount of its net assets is not less than
the aggregate of its called up share capital and undistributable reserves (as defined in the Companies Act) and to the extent that the distribution does not reduce the amount of those assets to less than that aggregate. Subject to the
foregoing, shareholders may, by ordinary resolution, declare dividends in accordance with the respective rights of the shareholders, but not exceeding the amount recommended by the Board. The Board may pay interim dividends if it considers that
National Grids financial position justifies the payment. Except insofar as the rights attaching to any share otherwise provide, all dividends will be apportioned and paid proportionately to the amounts paid up (otherwise than in advance of
calls) on the shares. Any dividend or interest unclaimed for 12 years from the date when it was declared or became due for payment will be forfeited and revert to National Grid. (ii) Voting rights Subject to
any rights or restrictions attached to any shares and to any other provisions of the Articles, at any general meeting on a show of hands, every shareholder who is present in person will have one vote and on a poll, every shareholder will have
one vote for every share which they hold. On a show of hands or poll, shareholders may cast votes either personally or by proxy and a proxy need not be a shareholder. Under the Articles, all substantive resolutions at a general meeting must be
decided on a poll, and resolutions of a procedural nature are decided by a show of hands, unless a poll is demanded in accordance with the Articles. (iii) Liquidation rights In a
winding up, a liquidator may, in each case with the sanction of a special resolution passed by the shareholders and any other sanction required under English law, (a) divide among the shareholders the whole or any part of National
Grids assets (whether the assets are of the same kind or not) and may, for this purpose, value any assets and determine how the division should be carried out as between shareholders or different classes of shareholders, or (b) transfer
any part of the assets to trustees on trust for the benefit of the shareholders as the liquidator determines, but in neither case will a shareholder be compelled to accept assets upon which there is a liability. Variation of rights Subject to
applicable provisions of English law, the rights attached to any class of shares of National Grid may be varied or cancelled with the written consent of the holders of three quarters in nominal value of the issued shares of that class, or with
the sanction of a special resolution passed at a separate meeting of the holders of the shares of that class.








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General meetings AGMs must be convened each year within six months of the Companys accounting reference date upon advance written notice of 21 clear days.
Any other general meeting may be convened provided at least 14 clear days written notice is given, subject to annual approval of shareholders. In certain limited circumstances, the Company can convene a general meeting by shorter notice. The
notice must specify, among other things, the nature of the business to be transacted, the place, the date and the time of the meeting. Rights of non residents There
are no restrictions under National Grids Articles that would limit the rights of persons not resident in the UK to vote in relation to ordinary shares. Disclosure of interests Under
the Companies Act, National Grid may by written notice require a person whom it has reasonable cause to believe to be or to have been in the last three years interested in its shares to provide additional information relating to that interest.
Under the Articles, failure to provide such information may result in a shareholder losing their rights to attend, vote or exercise any other right in relation to shareholders meetings. Under the UK Disclosure and Transparency Rules, there is also an obligation on a person who acquires or ceases to have a notifiable interest in
shares in National Grid to notify the Company of that fact. The disclosure threshold is 3% and disclosure is required each time the persons direct and indirect holdings reach, exceed or fall below each 1% threshold thereafter. The UK City Code on Takeovers and Mergers imposes strict disclosure requirements with regard to dealings in the securities of an offeror or
offeree company, and also on their respective associates, during the course of an offer period. Other regulators in the UK, US and elsewhere may have, or assert, notification or approval rights over acquisitions or transfers of shares. Code of Ethics In accordance with US legal requirements, the Board has adopted a Code of Ethics for senior financial professionals. This code is available on our website (where any amendments or waivers will also be posted). There were
no amendments to, or waivers of, our Code of Ethics during the year. Corporate governance
practices: differences from New York Stock Exchange (NYSE) listing standards The Company is listed on the NYSE and is therefore required to disclose differences in its corporate governance practices adopted as a UK
listed company, compared with those of a US company. The corporate governance practices of the Company are primarily based on the
requirements of the UK Corporate Governance Code (the Code) but substantially conform to those required of US companies listed on the NYSE. The following is a summary of the significant ways in which the Companys corporate governance
practices differ from those followed by US companies under Section 303A Corporate Governance Standards of the NYSE.
 

The NYSE rules and the Code apply different tests for the independence of Board members. 

The NYSE rules require a separate nominating/corporate governance committee composed entirely of independent directors. There is, however, no requirement for a separate corporate governance
committee in the UK. Under the Companys corporate governance policies, all Directors on the Board discuss and decide upon governance issues and the Nominations Committee makes recommendations to the Board with regard to certain of
the responsibilities of a corporate governance committee. 

The NYSE rules require listed companies to adopt and disclose corporate governance guidelines. While the Company reports compliance with the Code in each Annual Report and Accounts, the UK
requirements do not require the Company to adopt and disclose separate corporate governance guidelines. 

The NYSE rules require a separate audit committee composed of at least three independent members. While the Companys Audit Committee exceeds the NYSEs minimum independent Non-executive
Director membership requirements, it should be noted that the quorum for a meeting of the Audit Committee, of two independent Non-executive Directors, is less than the minimum membership requirements under the NYSE rules. 

The NYSE rules require a compensation committee composed entirely of independent directors, and prescribe criteria to evaluate the independence of the committees members and its ability
to engage external compensation advisors. While the Code prescribes different independence criteria, the Non-executive Directors on the Remuneration Committee have each been deemed independent by the Board under the NYSE rules. Although
the evaluation criteria for appointment of external advisors differ under the Code, the Remuneration Committee is solely responsible for appointment, retention and termination of such advisors. Depositary payments to the Company The Depositary has agreed to reimburse the Company for expenses it incurs that are related maintenance expenses of the ADS programme. The
Depositary has also agreed to pay the standard out of pocket maintenance costs for the ADSs, which consist of the expenses of postage and envelopes for mailing annual and interim financial reports, printing and distributing dividend cheques,
electronic filing of US federal tax information, mailing required tax forms, stationery, postage, facsimile and telephone calls. It has also agreed to reimburse the Company annually for certain investor relationship programmes or special investor
relations promotional activities. There are limits on the amount of expenses for which the Depositary will reimburse the Company, but the amount of reimbursement available to the Company is not necessarily tied to the amount of fees the Depositary
collects from investors. For the period 1 April 2012 to 15 May 2013, the Company received $200,000 in reimbursements from the Depositary. Going forward, fees that it is proposed be charged on cash dividends, see page 186, will be
apportioned between the Depositary and the Company. Any questions from ADS holders should be directed to The Bank of New York Mellon: The Bank of New York Mellon Depositary Receipts PO Box 43006 Providence, RI 02940-3006 Telephone: 1-800-466-7215 (International +1-201-680-6825) Email: shrrelations@bnymellon.com


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Additional Information

Additional Information

Other disclosures

Continued



Description of securities other than equity securities: depositary fees
and charges The Bank of New York Mellon, as Depositary, collects its fees for delivery and surrender of ADSs directly from investors
depositing shares or surrendering ADSs for the purpose of withdrawal or from intermediaries acting for them. The Depositary collects fees for making distributions to investors (including, it is expected going forward, in respect of cash
dividends) by deducting those fees from the amounts distributed or by selling a portion of distributable property to pay the fees. The Depositary may generally refuse to provide fee attracting services until its fees for those services are
paid.  Persons depositing or
withdrawing shares must pay:

For:$5.00 per 100 ADSs (or portion of
100 ADSs)

Issuance of ADSs,
including issuances resulting from a distribution of shares or rights or other property; cancellation of ADSs for the purpose of withdrawal, including if the deposit agreement terminates; distribution of securities distributed to holders of
deposited securities that are distributed by the Depositary to ADS registered holders.Registration or transfer fees

Transfer and
registration of shares on our share register to or from the name of the Depositary or its agent when they deposit or withdraw shares.Expenses of the Depositary

Cable, telex and
facsimile transmissions (when expressly provided in the deposit agreement); converting foreign currency to dollars.Taxes
and other governmental charges the Depositary or the Custodian has to pay on any ADS or share underlying an ADS, for example, stock transfer taxes, stamp duty or withholding taxes

As necessary. The Company has agreed to amend the deposit agreement under which the ADS representing its ordinary shares are
issued to allow a fee of up to $0.05 per ADS to be charged for any cash distribution made to ADS holders, including cash dividends. Subject to Form F-6 on which the amended deposit agreement is filed being declared effective by the SEC, commencing
with the final dividend payment payable on 21 August 2013, ADS holders who receive a cash dividend will be charged a fee, which will be deducted by the Depositary from interim and final cash dividends prior to distribution of the cash dividend.
The payment of the final dividend is subject to approval by shareholders at the AGM taking place on 29 July 2013.


Documents on display National Grid is subject to the filing requirements of the Exchange Act, as amended. In accordance with these requirements, we file reports
and other information with the SEC. These materials, including this document, may be inspected during normal business hours at our registered office 1-3 Strand, London WC2N 5EH or at the SECs Public Reference Room at 100 F Street, NE,
Washington, DC 20549. For further information about the Public Reference Room, please call the SEC at 1-800-SEC-0330. Some of our filings are also available on the SECs website at www.sec.gov. Employees We negotiate with recognised unions. It is our policy to maintain well developed communications and consultation programmes and there have been no material disruptions to our operations from labour disputes during the past five
years. National Grid believes that it can conduct its relationships with trade unions and employees in a satisfactory manner. Exchange controls There are currently no UK laws, decrees or regulations that restrict the export or import of capital, including,
but not limited to, foreign exchange control restrictions, or that affect the remittance of dividends, interest or other payments to non UK resident holders of ordinary shares except as otherwise set out in Taxation below and except in respect of
the governments of and/or certain citizens, residents or bodies of certain countries (described in applicable Bank of England Notices or European Union Council Regulations in force as at the date of this document). Exchange rates The following table shows the history of the exchange rates of one pound sterling to dollars for the periods indicated.  Dollar equivalent of £1 sterlingHigh


LowApril 2013


1.5564



1.5128March 2013


1.5239



1.4885February 2013


1.5837



1.5109January 2013


1.6284



1.5709December 2012


1.627



1.6021Average
*2012/13






1.572011/12






1.602010/11






1.572009/10






1.582008/09






1.54  *
The average for each period is calculated by using the average of the exchange rates on the last day of each month during the period






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Key milestones Some of the key dates and actions in the corporate history of National Grid are listed below. The full history goes back much further.  1986

British Gas (BG) privatisation1990

Electricity transmission network in England and Wales transferred to National Grid on electricity privatisation1995

National Grid listed on the London Stock Exchange1997

Centrica demerged from BG1997

Energis demerged from National Grid2000

Lattice Group demerged from BG and listed separately2000

New England Electric System and Eastern Utilities Associates acquired2002

Niagara Mohawk Power Corporation merged with National Grid in US2002

National Grid and Lattice Group merged to form National Grid Transco2004

UK wireless infrastructure network acquired from Crown Castle International Corp2005

Four UK regional gas distribution networks sold and National Grid adopted as our name2006

Rhode Island gas distribution network acquired2007

UK and US wireless infrastructure operations and the Basslink electricity interconnector in Australia sold2007

KeySpan Corporation acquired2008

Ravenswood generation station sold2010

Rights issue raised £3.2 billion2012

New Hampshire electricity and gas distribution businesses sold Material contracts Each of our Executive Directors has a service agreement and each Non-executive Director has a letter of appointment. No contract (other than
contracts entered into in the ordinary course of business) has been entered into by National Grid within the two years immediately preceding the date of this report which is, or may be, material; or which contains any provision under which any
member of National Grid has any obligation or entitlement which is material to National Grid at the date of this report. Property, plant and equipment This information can be found under the heading note 10 property, plant and equipment on page 123,
where we operate on page 17 and principal operations on pages 18 to 25.
 Shareholder analysis The following table includes a brief analysis of shareholder numbers and shareholdings as at 31 March 2013.  Size of shareholding

Number of
shareholders

% of
shareholders

Number of
shares

% of
shares150

179,075

17.5557

5,231,323


0.137851100

281,501

27.5972

19,954,907


0.5259101500

441,380

43.2711

92,384,691


2.43475011,000

59,446

5.8278

41,546,450


1.09491,00110,000

55,507

5.4417

136,335,171


3.592910,00150,000

2,090

0.2049

37,264,660


0.982150,001100,000

198

0.0194

14,264,142


0.3759100,001500,000

431

0.0423

102,310,714


2.6962500,0011,000,000

133

0.013

93,395,541


2.46131,000,001+

274

0.0269

3,251,888,399


85.6983Total

1,020,035

100

3,794,575,998


100 Taxation This section discusses certain US federal income tax and UK tax consequences of the ownership of ADSs and ordinary shares by certain
beneficial holders thereof. This discussion applies to holders who qualify for benefits under the income tax convention between the US and the UK (the Tax Convention) and are a resident of the US for the purposes of the Tax Convention and are not
resident or ordinarily resident in the UK for UK tax purposes at any material time (a US Holder). US Holders generally will be
entitled to benefits under the Tax Convention if they are:  

the beneficial owner of the ADSs or ordinary shares, as applicable, and of any dividends that they receive; 

an individual resident or citizen of the US, a US corporation, or a US partnership, estate, or trust (but only to the extent the income of the partnership, estate, or trust is subject to
US taxation in the hands of a US resident person); and 

not also a resident of the UK for UK tax purposes.


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Additional Information

Additional information

Other disclosures

Continued



If a US Holder holds ADSs or ordinary shares in connection with the conduct of business or the
performance of personal services in the UK or otherwise in connection with a branch, agency or permanent establishment in the UK, then the US Holder will not be entitled to benefits under the Tax Convention. Special rules, including a limitation of
benefits provision, apply in limited circumstances to ADSs or ordinary shares owned by an investment or holding company. This section does not discuss the treatment of holders described in the preceding two sentences. This section does not purport
to be a comprehensive description of all of the tax considerations that may be relevant to any particular investor. National Grid has assumed that shareholders, including US Holders, are familiar with the tax rules applicable to investments in
securities generally and with any special rules to which they may be subject. In particular, the discussion deals only with investors that will beneficially hold ADSs or ordinary shares as capital assets and does not address the tax treatment of
investors that are subject to special rules, such as banks, insurance companies, dealers in securities or currencies, partnerships or other entities classified as partnerships for US federal income tax purposes, persons that control (directly
or indirectly) 10% or more of our voting stock, persons that elect mark-to-market treatment, persons that hold ADSs or ordinary shares as a position in a straddle, conversion transaction, synthetic security, or other integrated financial
transaction, persons who are liable for the alternative minimum tax, and persons whose functional currency is not the dollar. The
statements regarding US and UK tax laws and administrative practices set forth below are based on laws, treaties, judicial decisions and regulatory interpretations in effect on the date of this document. These laws and practices are subject to
change without notice, possibly with retrospective effect. In addition, the US statements set forth below are based on the representations of The Bank of New York Mellon as depositary (the Depositary). These statements assume that each obligation
provided for in, or otherwise contemplated by, the deposit agreement entered into between National Grid Transco plc (now National Grid plc), the Depositary and the registered holders of ADRs, pursuant to which ADSs have been issued, dated as of
21 November 1995 and amended and restated as of 1 August 2005, and any related agreement, will be performed in accordance with its terms. Beneficial owners of ADSs who are residents or citizens of the US will be treated as the owners of
the underlying ordinary shares for the purposes of the US Internal Revenue Code. For the purposes of the Tax Convention, the
Estate Tax Convention and UK tax considerations, we have assumed that a holder of ADRs will be treated as the owner of the ordinary shares represented by those ADSs and this section is based on that assumption. Despite a recent ruling by
the First-Tier Tax Tribunal in the UK that has cast doubt on this view, HM Revenue & Customs have stated that they will continue to apply their longstanding practice of treating such an ADR holder as holding the beneficial interest in the
underlying shares. As such, this is an area of some uncertainty that may be subject to further developments. A US Holder should
consult their own advisor as to the tax consequences of the purchase, ownership and disposition of ADSs or ordinary shares in light of their particular circumstances, including the effect of any state, local or other national laws.
 Taxation of dividends Under the Tax Convention, the UK is allowed to impose a 15% withholding tax on dividends paid to US shareholders controlling less than 10% of
the voting capital of National Grid. The UK does not, however, currently impose a withholding tax on such dividends. Cash
distributions received by a US Holder with respect to their ADSs or ordinary shares generally will be treated as foreign source dividend income subject to US federal income taxation as ordinary income, to the extent paid out of National Grids
current or accumulated earnings and profits, as determined under US federal income tax principles. The dollar amount of dividends received by certain non corporate US Holders with respect to ADSs or ordinary shares will generally be subject to
taxation at a the special reduced rate normally applicable to long-term capital gains, provided National Grid (i) is eligible for the benefits of the Tax Convention and (ii) was not, in the year prior to the year in which the dividend was
paid, and is not, in the year in which the dividend is paid, a passive foreign investment company (PFIC). Based on National
Grids audited financial statements and relevant market and shareholder data, National Grid believes that it was not treated as a PFIC for US federal income tax purposes with respect to its taxable years ending 31 March 2012 and 2013. In
addition, based on its current expectations regarding the value and nature of its assets, the sources and nature of its income, and relevant market and shareholder data, National Grid does not anticipate becoming a PFIC in the foreseeable
future. Dividends paid by National Grid to corporate US Holders will not be eligible for the dividends received deduction generally allowed to corporations. Taxation of capital gains US Holders will not be liable for UK taxation on any capital gain realised on the disposal
of ADSs or ordinary shares. Sales or other taxable dispositions of ADSs or ordinary shares by a US Holder generally will give
rise to US source capital gain or loss equal to the difference between the dollar value of the amount realised on the disposition and the US Holders dollar basis in the shares or ADSs. Any such capital gain or loss generally will be long-term
capital gain or loss, currently subject to taxation at reduced rates for non corporate taxpayers, if the ordinary shares or ADSs were held for more than one year. The deductibility of capital losses is subject to limitations. UK stamp duty and stamp duty reserve tax (SDRT) Transfers of ordinary shares  SDRT at the rate of 0.5% of the amount of value of the consideration will generally be payable on any agreement to transfer ordinary shares that is not completed by the execution of a duly
stamped instrument of transfer to the transferee. Where an instrument of transfer is executed and duly stamped before the expiry of the period of six years beginning with the date on which the agreement is made, the SDRT liability will be cancelled,
and, if a claim is made within the specified period, any SDRT which has been paid will be refunded. SDRT is due whether or not the agreement or transfer of such chargeable securities is made or carried out in the UK and whether or not any party to
that agreement or transfer is a UK resident. Purchases of ordinary shares completed by execution of a stock transfer form will generally give rise to a liability to UK stamp duty at the rate of 0.5% (rounded up to the nearest $5) of the amount or
value of the consideration. Paperless transfers under the








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CREST paperless settlement system will generally be liable to SDRT at the rate of 0.5%, and not
stamp duty. SDRT is generally the liability of the purchaser and UK stamp duty is usually paid by the purchaser or transferee. Transfers of ADSs  No UK stamp duty will be payable on the acquisition or transfer of existing ADSs or beneficial ownership
of ADSs, provided that any instrument of transfer or written agreement to transfer is executed outside the UK and remains at all times outside the UK. An agreement for the transfer of ADSs in the form of ADRs will not give rise to a
liability for SDRT. A charge to stamp duty or SDRT may arise on the transfer of ordinary shares to the Depositary or The Bank of New York Mellon as agent of the Depositary (the Custodian). The rate of stamp duty or SDRT will generally be 1.5% of the
value of the consideration or, in some circumstances, the value of the ordinary shares concerned. However, following a recent ruling by the First-Tier Tax Tribunal in the UK, there is no 1.5% SDRT charge on the issue of ordinary shares (or,
where it is integral to the raising of new capital, the transfer of ordinary shares) to the Depositary or the Custodian. The Depositary will generally be liable for the stamp duty or SDRT. In accordance with the terms of the Depositary Agreement,
the Depositary will charge any tax payable by the Depositary or the Custodian (or their nominees) on the deposit of ordinary shares to the party to whom the ADSs are delivered against such deposits. If the stamp duty is not a multiple of £5,
the duty will be rounded up to the nearest multiple of £5. US information reporting and backup withholding Dividend payments made to US Holders and proceeds paid from the sale, exchange, redemption or disposal of ADSs or ordinary shares to US Holders
may be subject to information reporting to the US Internal Revenue Service (IRS). Such payments may be subject to backup withholding taxes unless the holder (i) is a corporation or other exempt recipient or (ii) provides a taxpayer
identification number on a properly completed IRS Form W-9 and certifies that no loss of exemption from backup withholding has occurred. US Holders should consult their tax advisors regarding these rules and any other reporting obligations that may apply to the ownership or disposition of ADSs or ordinary shares, including reporting requirements related to the
holding of certain foreign financial assets. UK inheritance tax An individual who is domiciled in the US for the purposes of the Estate Tax Convention and who is not a national of the UK for the purposes
of the Estate Tax Convention will generally not be subject to UK inheritance tax in respect of the ADSs or ordinary shares on the individuals death or on a gift of the ADSs or ordinary shares during the individuals lifetime, unless the
ADSs or ordinary shares are part of the business property of a permanent establishment of the individual in the UK or pertain to a fixed base in the UK of an individual who performs independent personal services. Special rules apply to ADSs or
ordinary shares held in trust. In the exceptional case where the ADSs or shares are subject both to UK inheritance tax and to US federal gift or estate tax, the Estate Tax Convention generally provides for the tax paid in the UK to be credited
against tax paid in the US.
 The offer and listing Price history The following
table shows the highest and lowest intraday market prices for our ordinary shares and ADSs for the periods indicated.  Ordinary share  (pence)


ADS ($)High


Low


High


Low2012/13


770.00



627.00



58.33



49.552011/12


660.50



545.50



52.18



45.802010/11*


666.00



474.80



51.00



36.722009/10


685.50



511.00



56.59



38.252008/09


754.00



515.00



74.89



36.642012/13 Q4


770.00



678.00



58.33



52.81Q3


724.97



679.59



58.03



54.28Q2


706.13



635.56



56.72



49.55Q1


689.50



627.00



55.00



49.852011/12 Q4


660.50



605.50



51.86



46.85Q3


653.50



590.00



51.53



46.49Q2


650.59



545.50



51.00



45.80Q1


639.00



581.50



52.18



46.93April 2013


820.50



765.00



63.78



57.86March 2013


770.00



718.00



58.33



54.37February 2013


735.00



678.00



55.64



52.81January 2013


713.00



678.50



58.00



54.37December 2012


724.97



696.00



58.03



56.30  *
On 20 May 2010, we announced a 2 for 5 rights issue of 990,439,017 ordinary shares at 355 pence per share Unresolved SEC staff comments There are no unresolved staff comments required to be reported.


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Additional Information Definitions and glossary of terms  Our aim is to use plain English in this Annual Report and Accounts. However,
where necessary, we do use a number of technical terms and/or abbreviations and we summarise the principal ones below, together with an explanation of their meanings. The descriptions below are not formal legal definitions.  A American Depositary Shares (ADSs) Securities of National Grid listed on the New York Stock Exchange, each of which represents five ordinary shares. They are evidenced by
American Depositary Receipts or ADRs. Annual General Meeting (AGM) Meeting of shareholders of the Company held each year to consider ordinary and special business as provided in the Notice of AGM.   B Board The Board of Directors of the Company (for more information see pages 26 to 27 and 180 to 182). bps Basis point (bps) is a unit
that is equal to 1/100th of 1% and is typically used to denote the movement in a percentage based metric such as interest rates or ROE. A 0.1% change in a percentage represents 10 basis points. BritNed BritNed Development
Limited.   C called up share capital Shares (common stock) that have been issued and have been fully paid for. carrying value The amount at
which an asset or a liability is recorded in the Groups statement of financial position and the Companys balance sheet. CF3I Trifluoroiodomethane (also referred to as trifluoromethyl iodide) is a gas
containing carbon, fluorine and iodine atoms which is being investigated as a gaseous dielectric medium for high voltage applications as a potential replacement for SF6, but with very much lower global warming potential. circuit See route length. the Company, the Group, National Grid, we, our or us We use the terms the Company, the Group, National Grid, we, our or us
to refer to either National Grid plc itself or to National Grid plc and its subsidiaries collectively, depending on context. consolidated financial statements Financial statements that include the results and financial position of the Company and its subsidiaries together as if they were a single entity.
 contingent liabilities Possible obligations or potential liabilities arising from past events for which no provision has been recorded, but for which disclosure in the
financial statements is made.   D DECC The Department of Energy & Climate Change, the UK Government ministry responsible for energy and climate change. decoupling See revenue
decoupling. deferred tax For most assets and liabilities, deferred tax is the amount of tax that will be payable or receivable in respect of that asset or liability in future tax returns as a result of a difference between the carrying value for
accounting purposes in the statement of financial position or balance sheet and the value for tax purposes of the same asset or liability. Delivery Body Under the Energy Bill currently being considered by the UK Parliament, National Grids electricity
system operator function would provide independent evidence and analysis to the UK Government to inform its decisions on the key rules and parameters to achieve the Governments policy objectives under Electricity Market Reform. As
proposed, National Grid would administer the capacity mechanism, including running the annual capacity auctions, managing the allocation of contracts for difference to low carbon generators and reporting to Government annually on
performance against the Governments delivery plan. Detailed roles and responsibilities for all market participants, including the Delivery Body, will be finalised within secondary legislation enacted under the Energy Act 2013, due to
be in force from summer 2014. derivative A financial instrument or other contract where the value is linked to an underlying index, such as exchange rates, interest rates or commodity prices. In most cases, contracts for the sale or purchase of commodities that are
used to supply customers or for our own needs are excluded from this definition. Directors/Executive Directors/Non-executive
Directors The Directors/Executive Directors and Non-executive Directors of the Company whose names are set out on pages 26 and 27
of this document. dollars or $ Except as otherwise noted all references to dollars or $ in this Annual Report and Accounts relate to the US currency.








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E earnings per share (EPS) Profit for the year attributable to equity shareholders of the parent allocated to each ordinary share. Electricity Market Reform (EMR) An energy policy initiative, introduced by the Energy Bill currently being considered by the UK Parliament, designed to provide greater financial
certainty to investors in low carbon generation by guaranteeing a price for electricity generated. employee engagement A key performance indicator, based on the percentage of favourable responses to certain indicator questions repeated in each employee survey,
which provides a measure of how employees think, feel and act in relation to National Grid. Research shows that a highly engaged workforce leads to increased productivity and employee retention, therefore we use employee engagement as a measure
of organisational health in relation to business performance. equity In financial statements, the amount of net assets attributable to shareholders. Estate Tax Convention The
Estate Tax Convention is the convention between the US and the UK for the avoidance of double taxation with respect to estate and gift taxes. EU The European Union, being the economic and political union of 27 member states located in Europe. Exchange Act The Securities
Exchange Act 1934, as amended.   F FERC The US Federal Energy Regulatory Commission. finance lease A lease where the asset is treated as if it was owned for the period of the lease and the obligation to
pay future rentals is treated as if they were borrowings. Also known as a capital lease. financial year For National Grid this is an accounting year ending on 31 March. Also known as a fiscal year. FRS A UK Financial Reporting
Standard as issued by the UK Financial Reporting Council (FRC). These apply to the Companys individual financial statements on pages 165 to 169, which are prepared in accordance with UK GAAP.   G Grain LNG National Grid Grain LNG Limited. Great Britain England, Wales
and Scotland. GW Gigawatt, being an amount of power equal to 1 billion watts (109 watts).
 H HMRC HM Revenue & Customs. The UK tax authority. HVDC High voltage, direct current electric power transmission which uses direct current for the bulk transmission of electrical power, in contrast with
the more common alternating current systems.   I IAS or IFRS An International Accounting Standard or International Financial Reporting Standard, as issued by the International Accounting Standards Board
(IASB). IFRS is also used as the term to describe international generally accepted accounting principles as a whole. individual
financial statements Financial statements of a company on its own, not including its subsidiaries or joint ventures. ISO 14001 Specifies the
requirements for an environmental management system and maps out a framework that an organisation can follow to set up an effective environmental management system. It can provide assurance to company management and employees, as well as external
stakeholders, that environmental impact is being measured and improved. ISO 31000 Published in 2009, it provides a comprehensive set of principles and generic guidelines for the implementation of good practice risk management
that can be applied across any organisation. It is not specific to any industry or sector.   J joint venture A company or
other entity which is controlled jointly with other parties.   K KeySpan KeySpan Corporation and
its subsidiaries, acquired by National Grid on 24 August 2007. kV Kilovolt, being an amount of electric force equal to 1,000 volts.   L Large Combustion Plant
Directive (LCPD 2001/80/EC) An EU directive which requires member states of the EU to control emissions of acidifying pollutants,
particles and ozone precursors from combustion plants with a rated thermal input of 50 MW or greater. Lifetime Allowance The Lifetime Allowance is an overall ceiling on the amount of UK tax privileged pension savings that any one individual can draw.


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Additional Information

Definitions and glossary of terms

Continued







LIPA The Long Island Power Authority. LNG Liquefied natural gas, being natural gas that has been condensed into a liquid form, typically at temperatures at or below -161°C
(-258°F). lost time injury An incident arising out of National Grids operations which leads to an injury where the employee or contractor normally has time off the following day or shift following the incident. It relates to one specific (acute)
identifiable incident which arises as a result of National Grids premises, plant or activities, which was reported to the supervisor at the time and was subject to appropriate investigation. lost time injury frequency rate (IFR) The number of lost time injuries per 100,000 hours worked in a 12 month period.   M MADPU The Massachusetts
Department of Public Utilities. MW Megawatt, being an amount of power equal to 1 million watts. MWh Megawatt hours, being an amount of energy equivalent to delivering 1 million watts of power for a period of one hour.   N National Grid Metering (NGM) National Grid Metering Limited, National Grids UK regulated metering business. New England The term refers to
a region within the northeastern US that includes the states of Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island and Vermont. National Grids New England operations are primarily in the states of Massachusetts and Rhode
Island. northeastern US The northeastern region of the US, comprising the states of Connecticut, Maine, Massachusetts, New Hampshire, New Jersey, New York, Pennsylvania, Rhode Island and Vermont. NYPSC The New York Public
Service Commission.   O Ofgem The UK Office of Gas and Electricity Markets, part of the UK Gas and Electricity Markets Authority (GEMA), which regulates the energy markets
in the UK. OnStream Utility Metering Services Limited, an unregulated UK metering business, sold by National Grid on 24 October 2011. ordinary shares Voting shares
entitling the holder to part ownership of a company. Also known as common stock. National Grids ordinary shares have a nominal value of 1117⁄43 pence.
 P Personal Lifetime Allowance The lifetime allowance applicable to individuals who registered their pre 6 April 2006 UK pension benefits for protection. price control The mechanism by
which Ofgem sets restrictions on the amounts of revenue we are allowed to collect from customers in our UK businesses. The allowed revenues are intended to cover efficiently incurred operational expenditure, capital expenditure and financing costs,
including a return on equity invested.   R rate base The base investment on which the utility is authorised to earn a cash return. It includes the original cost of facilities, minus
depreciation, an allowance for working capital and other accounts. rate plan The term given to the mechanism by which a US utility regulator sets terms and conditions for utility service including, in particular, tariffs
and rate schedules. The term can mean a multi-year plan that is approved for a specified period, or an order approving tariffs and rate schedules that remain in effect until changed as a result of future regulatory proceedings. Such proceedings
can be commenced through a filing by the utility or on the regulators own initiative. regulated controllable operating costs Total operating costs under IFRS less depreciation and certain regulatory costs where, under our regulatory agreements, mechanisms are
in place to recover such costs in current or future periods. regulatory asset value (RAV) The value ascribed by Ofgem to the capital employed in the relevant licensed business. It is an estimate of the initial market value of the
regulated asset base at privatisation, plus subsequent allowed additions at historical cost, less the deduction of annual regulatory depreciation. Deductions are also made to reflect the value realised from the disposal of certain assets that formed
part of the regulatory asset base. It is also indexed to the RPI to allow for the effects of inflation. return on capital employed
(RoCE) Financial metric expressing a measure of post-tax operating profit as a percentage of capital (debt and equity) invested in
the business. return on equity (ROE) A performance metric measuring returns from the investment of shareholders funds. It is a financial ratio of a measure of earnings
divided by an equity base. revenue decoupling Revenue decoupling is the term given to the elimination of the dependency of a utilitys revenue on the volume of gas or electricity
transported. The purpose of decoupling is to eliminate the disincentive a utility otherwise has to encourage energy efficiency programmes. RIIO The revised regulatory framework issued by Ofgem which was implemented in the eight year price controls which
started on 1 April 2013.








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RIPUC The Rhode Island Public Utilities Commission. route length The route length of an electricity transmission line is the geographical distance from the start tower to the end tower. In most cases in the
UK, and in many cases in the US, the transmission line consists of a double circuit for additional reliability. In such cases, the circuit length is twice the route length. RPI The UK retail price index
as published by the Office for National Statistics.   S Scope 1 emissions Scope 1 emissions are direct greenhouse gas emissions that occur from sources that are owned or controlled by the Company, for example,
emissions from combustion in owned or controlled boilers, furnaces, vehicles, etc. Scope 2 emissions Scope 2 emissions are greenhouse gas emissions from the generation of purchased electricity consumed by the Company. Purchased electricity is
defined as electricity that is purchased or otherwise brought into the organisational boundary of the Company. Scope 2 emissions physically occur at the facility where electricity is generated. SEC The US Securities and
Exchange Commission, the financial regulator for companies with registered securities in the US, including National Grid and certain of its subsidiaries. SF6 Sulphur hexafluoride, an inorganic, colourless, odourless
and non-flammable greenhouse gas. SF6is used in the electrical industry as a gaseous dielectric medium for high voltage circuit breakers, switchgear and other electrical equipment. share premium The difference
between the amounts shares are issued for and the nominal value of those shares. standard cubic metre A quantity of gas which at 15°C and atmospheric pressure (1.013 bar) occupies the volume of 1m3. stranded cost recoveries The recovery of historical generation-related costs in the US, related to generation assets that are no longer owned by us. subsidiary A company or other
entity that is controlled by National Grid. swaptions A swaption gives the buyer, in exchange for an option premium, the right, but not the obligation, to enter into an interest rate swap at some
specified date in the future. The terms of the swap are specified on the trade date of the swaption.   T taxes borne Those taxes that
represent a cost to the Company and which are reflected in our results.
 taxes collected Those taxes that are generated by our operations but which do not affect our results; we generate the commercial activity giving rise to these
taxes and then collect and administer them on behalf of HMRC. tonne A unit of mass equal to 1,000 kilogrammes, equivalent to approximately 2,205 pounds. tonnes carbon dioxide equivalent (CO2e) A measure of greenhouse gas emissions in terms of the equivalent amount of carbon dioxide. treasury shares Shares that
have been repurchased but not cancelled. These shares can then be allotted to meet obligations under the Companys employee share schemes. TWh Terawatt hours, being an amount of energy equivalent to delivering 1 billion watts of power for a period of 1,000
hours.   U UK The United Kingdom, comprising England, Wales, Scotland and Northern Ireland. UK Corporate Governance Code (the Code) Guidance, issued by the Financial Reporting Council in 2010, on how companies should be governed, applicable to UK listed companies including National Grid. A new edition of the UK Corporate Governance Code was published in
September 2012 (the new Code). UK GAAP Generally accepted accounting principles in the UK. These differ from IFRS and from US GAAP. US The United States of
America, its territories and possessions, any state of the United States and the District of Columbia. US GAAP Generally accepted accounting principles in the US. These differ from IFRS and from UK GAAP. US state regulators (state utility commissions) In the US, public utilities retail transactions are regulated by state utility commissions, including the New York Public Service Commission (NYPSC), the Massachusetts Department of Public Utilities (MADPU) and the Rhode
Island Public Utilities Commission (RIPUC).   V vanilla return Metric used by Ofgem to define the allowed rate of return within the price control reviews for our UK regulated businesses. Our calculation uses
IFRS business performance operating profit adjusted for various items to reflect the replacement of certain IFRS-based accounting treatments with a regulatory-based treatment. Primarily these items are depreciation, capital costs, pensions and
taxation. The adjusted IFRS operating profit is divided by the regulatory asset value inflated to mid year to generate a percentage rate of return.


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Additional Information Summary consolidated financial information  Financial summary (unaudited) The financial summary set out below has been derived from the audited consolidated financial statements of National Grid for the
five financial years ended 31 March 2013. It should be read in conjunction with the consolidated financial statements and related notes, together with the Strategic Review. The information presented below for the years ended 31 March
2009, 2010, 2011, 2012 and 2013 has been prepared under IFRS issued by the IASB and as adopted by the EU(i).  31 March


31 March


31 March


31 March


31 March2013


2012


2011


2010


2009£m


£m


£m


£m


£mSummary income statementRevenue (ii)


14,359



13,832



14,343



14,007



15,687Operating profitBefore exceptional items, remeasurements and stranded cost recoveries


3,644



3,495



3,600



3,121



2,915Exceptional items, remeasurements and stranded cost recoveries


110



44



145



172



(292)3,754



3,539



3,745



3,293



2,623Profit before taxBefore exceptional items, remeasurements and stranded cost recoveries


2,742



2,585



2,473



1,974



1,770Exceptional items, remeasurements and stranded cost recoveries


178



(26
)


151



219



(376)2,920



2,559



2,624



2,193



1,394Profit for the year from continuing operations


2,296



2,038



2,163



1,389



922Profit for the year


2,296



2,038



2,163



1,389



947Profit for the year attributable to equity shareholdersBefore exceptional items, remeasurements and stranded cost recoveries


2,055



1,828



1,747



1,418



1,259Exceptional items, remeasurements and stranded cost recoveries


240



208



412



(32
)


(315)2,295



2,036



2,159



1,386



944Earnings per shareBasic  continuing operations (pence) (iii)


62.6



55.6



61.2



46.0



30.3Diluted  continuing operations (pence) (iii)


62.3



55.4



60.9



45.8



30.1Basic (pence) (iii)


62.6



55.6



61.2



46.0



31.1Diluted (pence) (iii)


62.3



55.4



60.9



45.8



31.0Number of shares  basic (millions) (iv)


3,664



3,659



3,525



3,011



3,033Number of shares  diluted (millions) (iv)


3,682



3,678



3,544



3,024



3,050Dividends per ordinary sharePaid during the year (pence)


39.84



37.40



37.74



36.65



33.94Approved or proposed during the year (pence)


40.85



39.28



36.37



38.49



35.64Paid during the year ($)


0.633



0.599



0.592



0.579



0.523Approved or proposed during the year ($)


0.632



0.623



0.571



0.608



0.549








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31 March


31 March


31 March


31 March


31 March2013


2012


2011


2010


2009£m


£m


£m


£m


£mSummary statement of net assetsNon-current assets


45,129



41,684



39,787



38,488



37,712Current assets


9,576



5,387



6,323



5,065



6,755Assets of businesses held for sale






264



290







Total assets


54,705



47,335



46,400



43,553



44,467Current liabilities


(7,445
)


(6,004
)


(6,826
)


(6,559
)


(7,026)Non-current liabilities


(37,027
)


(31,998
)


(30,395
)


(32,783
)


(33,457)Liabilities of businesses held for sale






(87
)


(110
)






Total liabilities


(44,472
)


(38,089
)


(37,331
)


(39,342
)


(40,483)Net assets


10,233



9,246



9,069



4,211



3,984Shareholders equity


10,228



9,239



9,060



4,199



3,970Summary cash flow statementCash generated from operationsContinuing operations


4,037



4,487



4,854



4,372



3,564Discontinued operations


















(8)4,037



4,487



4,854



4,372



3,556Tax (paid)/received


(287
)


(259
)


4



144



(143)Net cash inflow from operating activities


3,750



4,228



4,858



4,516



3,413Net cash flows used in investing activities


(6,130
)


(2,371
)


(4,774
)


(2,332
)


(1,998)Net cash flows from/(used in) financing activities


2,715



(1,900
)


(430
)


(2,212
)


(877)Net increase/(decrease) in cash and cash equivalents


335



(43
)


(346
)


(28
)


538 (i)
Since the implementation of IFRS by the Company, there have been no significant changes in accounting standards, interpretations or policies that have a material financial impact on the selected
financial data. (ii)
Items previously reported for 2009-2010 separately as other operating income have been included within revenue. (iii)
Items previously reported for 2009-2012 have been restated to reflect the impact of the bonus element of the rights issue and the additional shares issued as scrip dividends. (iv)
Number of shares previously reported for 2009-2012 have been restated to reflect the impact of the additional shares issued as scrip dividends.


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Additional Information  Useful information  Financial calendar The following dates have been announced or are indicative:  5 June 2013

Ordinary shares go ex-dividend for 2012/137 June 2013

Record date for 2012/13 final dividend12 June 2013

Scrip reference price announced24 July 2013

Scrip election date29 July 2013

2013 Annual General Meeting and interim management statement21 August 2013

2012/13 final dividend paid to qualifying shareholders21 November 2013

2013/14 half year results4 December 2013

Ordinary shares go ex-dividend6 December 2013

Record date for 2013/14 interim dividend22 January 2014

2013/14 interim dividend paid to qualifying shareholdersJanuary/February 2014

Interim management statementMay 2014

2013/14 preliminary results Dividends The Directors are recommending a final dividend of 26.36 pence per ordinary share ($2.0088 per ADS) to be paid on 21 August 2013 to shareholders on the register as at 7 June 2013. Further details in respect of
dividend payments can be found on page 48. If you live outside the UK, you may be able to request that your dividend payments be converted into your local currency. Have your dividends paid directly into your bank or building society account:  

Your dividend reaches your account on the payment day 

It is more secure  cheques do sometimes get lost in the post 

No more trips to the bank Elect to receive your dividends as
additional shares:  

Join our scrip dividend scheme 

No stamp duty or commission to pay American Depositary Shares The Company has agreed to amend the deposit agreement under which the ADS representing its ordinary shares are issued to allow a fee
of up to $0.05 per ADS to be charged for any cash distribution made to ADS holders, including cash dividends. Subject to the Form F-6 on which the amended deposit agreement is filed being declared effective by the SEC, commencing with the final
dividend payment payable on 21 August 2013, ADS holders who receive a cash dividend will be charged a fee, which will be deducted by the Depositary from interim and final cash dividends prior to distribution of the cash dividend. Electronic communications To receive an email notifying you as soon as there is new shareholder information for you to view online, sign up for electronic communications via the National Grid Share Portalwww.nationalgridshareholders.comand follow the on screen instructions on the manage your account link to change your
communication preferences. It only takes a few minutes to register, just have your 11 digit Investor Code (IVC) to hand.
 Want more information
or help?  Please use the contact details set out on
the back cover to find out more information about your dividend options, for terms and conditions of any of the services offered or for help with any other queries. The National Grid Share Portal is a secure online site where you can:  

View your holdings and get an indicative value 

View your dividend payment history 

Get copies of your dividend tax vouchers 

Update your address details 

Buy and sell shares 

Register your AGM proxy votes 

Sign up for electronic communications Share price The share capital of the Company consists of ordinary shares of 1117⁄43 pence nominal value each and ADSs, which represent five ordinary 43 shares. The following graph represents the movement of National Grids share price during 2012/13. A graph showing the total
shareholder return over the last five years is available on page 44. LOGO National Grid ordinary shares are listed on the London Stock Exchange under the symbol NG and the ADSs are
listed on the New York Stock Exchange under the symbol NGG. Share dealing Capita Share Dealing Services offer our European Economic Area resident shareholders a range of quick and easy share dealing services: 

Buy more shares £20 flat fee (plus stamp duty) 

Sell all your shares by post 1 to 150 shares  10p per share (maximum £10); 151 shares or more  £15 flat fee 

Donate all your shares free of charge to ShareGift Visit
www.capitadeal.com/nationalgrid or call Capita Share Dealing free on 0800 022 3374 for details and terms and conditions. This is not a recommendation to take any action. High street banks may also offer share dealing services. If you have any doubt as to what action you should take, please contact an authorised financial advisor. ShareGift:If you only have a
small number of shares which would cost more for you to sell than they are worth, you may wish to consider donating them to the charity. ShareGift is a registered charity (no. 1052686) which specialises in accepting such shares as
donations. For more information visitwww.sharegift.org.ukor contact Capita Registrars. Individual Savings Accounts
(ISAs):Corporate ISAs for National Grid shares are available from Stocktrade. For more information, call Stocktrade on 0131 240 0443, emailisa@stocktrade.co.ukor write to Stocktrade, 81 George Street, Edinburgh EH2 3ES. National Grid plc was incorporated on 11 July 2000. The Company is registered in England and Wales No. 4031152, with its registered office
at 1-3 Strand, London WC2N 5EH. The Companys agent in the United States is National Grid USA, Attn: General Counsel, 40
Sylvan Road, Waltham, MA 02451.








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|                                                      |  |                                                                                                                                                                                                   |  |                                                                                                                                       |  |                                                                                           |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|----------------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  | ------------------------------------------------------------------------------------------------------------------------------------- |  | ----------------------------------------------------------------------------------------- |  | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|Want more information or help?                        |  |                                                                                                                                                                                                  
|Capita Registrars 
For queries about ordinary shares: |  | The Bank of New York
Mellon  For queries aboutAmerican Depositary Shares:                                                                                                                         |  | Further information about National Grid
including share price and interactive tools can be found on our website: www.nationalgrid.com
|LOGO                                                  |  | 0871 402 3344
Calls cost 8p per minute plus
network extras. Lines are open
8.30am to 5.30pm, Monday to Friday. If calling from outside the UK: +44 (0)20 7098 1198
Textphone: 18001 0871 664 0532 |  | LOGO                                                                                                                                  |  | 1-800-466-7215
If calling from outside the US:
+1-201-680-6825                            |  | Have you received unsolicited investment
advice? Shareholders are advised to be wary of any unsolicited advice or offers, whether over the telephone, through the post or
by email. If you receive any such unsolicited communication please check the company or person contacting you is properly authorised by the FCA before getting involved. 
You can check at www.fca.org.uk/ consumers/protect-yourself and can report calls from unauthorised firms to the FCA by calling 0800 111
6768.
|LOGO                                                  |  | Visit the National Grid Share
Portal www.nationalgridshareholders.com
Email: nationalgrid@
capitaregistrars.com                                                                                   |  | LOGO                                                                                                                                  |  | www.mybnymdr.com Email:
shrrelations@ bnymellon.com                                       | 
|LOGO                                                  |  | National Grid Share Register,
Capita Registrars, The Registry,
34 Beckenham Road, Beckenham,
Kent BR3 4TU                                                                                         |  | LOGO                                                                                                                                  |  | The Bank of New York Mellon,
Depositary Receipts, PO Box
43006, Providence, RI 02940-3006 | 



Cautionary Statement This document comprises the Annual Report and Accounts for the year ending 31 March 2013 for National Grid and its subsidiaries. It contains
the Directors Report and Financial Statements, together with the Independent Auditors Report thereon, as required by the Companies Act 2006. The Directors Report, comprising pages 06 to 91 and 170 to 189, has been drawn up in
accordance with the requirements of English law, and liability in respect thereof is also governed by English law. In particular, the liability of the Directors for these reports is solely to National Grid. This document contains certain statements that are neither reported financial results nor other historical information. These statements are
forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. These statements include information with respect to
our financial condition, our results of operations and businesses, strategy, plans and objectives. Words such as anticipates, expects, should, intends, plans, believes,
outlook, seeks, estimates, targets, may, will, continue, project and similar expressions, as well as statements in the future tense, identify
forward-looking statements. These forward-looking statements are not guarantees of our future performance and are subject to assumptions, risks and uncertainties that could cause actual future results to differ materially from those expressed in or
implied by such forward-looking statements. Many of these assumptions, risks and uncertainties relate to factors


that are beyond our ability to control or estimate precisely, such as changes in laws or regulations, announcements from and decisions by governmental bodies or regulators (including the
timeliness of consents for construction projects); breaches of, or changes in, environmental, climate change and health and safety laws or regulations, including breaches arising from the potentially harmful nature of our activities; network failure
or interruption (and our actual or perceived response thereto), the inability to carry out critical non network operations and damage to infrastructure, due to adverse weather conditions including the impact of Superstorm Sandy and other major
storms as well as the results of climate change or due to unauthorised access to or deliberate breaches of our IT systems or otherwise; performance against regulatory targets and standards and against our peers with the aim of delivering stakeholder
expectations regarding costs and efficiency savings, including those related to investment programmes and internal transformation projects (including the US foundation programme); and customers and counterparties failing to perform their obligations
to the Company. Other factors that could cause actual results to differ materially from those described in this document include fluctuations in exchange rates, interest rates and commodity price indices; restrictions and conditions (including
filing requirements) in our borrowing and debt arrangements, funding costs and access to financing; regulatory requirements for us to maintain financial resources in certain parts of our business and restrictions on some subsidiaries
transactions such as paying dividends, lending or levying charges;


inflation; the delayed timing of recoveries and payments in our regulated businesses and whether aspects of our activities are contestable; the funding requirements and performance of our pension
schemes and other post-retirement benefit schemes; the loss of key personnel or the ability to attract, train or retain qualified personnel and any significant disputes arising with our employees or the breach of laws
or regulations by our employees; and incorrect or unforeseen assumptions or conclusions (including financial and tax impacts and other unanticipated effects) relating to business development activity, including assumptions in connection with
joint ventures. For further details regarding these and other assumptions, risks and uncertainties that may affect National Grid,
please read the Strategic Review section including the Risk factors on pages 176 to 178 of this document. In addition, new factors emerge from time to time and we cannot assess the potential impact of any such factor on our activities or
the extent to which any factor, or combination of factors, may cause actual future results to differ materially from those contained in any forward-looking statement. Except as may be required by law or regulation, the Company
undertakes no obligation to update any of its forward-looking statements, which speak only as of the date of this document. The contents of any website references in this document do not form part of this document.






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##### Table of Contents

Further Information

Exchange Rates

The following table sets forth the history
of the exchange rates of one pound sterling to US dollars for the periods indicated and as at the latest practicable date, 6 June 2013.



|           |  |      |        |  |     |  |        | 
|---------- |  | ---- | ------ |  | --- |  | ------ | 
|           |  | High |        |  | Low | 
|June 2013* |  |      | 1.5392 |  |     |  | 1.5293 | 
|May 2013   |  |      | 1.5568 |  |     |  | 1.5035 | 





| | * | For the period to 6 June 2013.
| | - | ------------------------------

Share ownership

At 6 June 2013, the latest practicable date, none of the directors had an individual beneficial interest amounting to greater than 1% of the Companys shares.

Material interests in shares

The following summarizes the significant changes in the percentage ownership held by our major shareholders during the past three years:

Capital Group Companies, Inc. held 5.04% of our outstanding share capital as at 9 June 2011. Their shareholding
increased to 10.02% of our outstanding share capital as at 31 March 2012. As noted on page 183 of the 2012/2013 Annual Report and Accounts, we have been notified that Capital Group Companies, Inc. held 10.91% of our outstanding share capital as
at 31 March 2013 and that such holdings increased as at 5 April 2013 to 11.02 % of our outstanding share capital which percentage remains unchanged as at 6 June 2013.

Since 31 March 2013, we have not been notified of any other subsequent significant change in the percentage of
shares held by the shareholders, listed on page 183 of the 2012/2013 Annual Report and Accounts.

Price history

The following table sets forth the highest and lowest intraday market prices for our ordinary shares and ADSs for the
periods indicated.



|           |  |                       |        |  |         |  |        |      |  |  |       |  |  |  |       | 
|---------- |  | --------------------- | ------ |  | ------- |  | ------ | ---- |  |  | ----- |  |  |  | ----- | 
|           |  | Ordinary Share(Pence) |        |  | ADS ($) | 
|           |  | High                  |        |  | Low     |  |        | High |  |  | Low   | 
|June 2013* |  |                       | 792.00 |  |         |  | 737.18 |      |  |  | 60.57 |  |  |  | 56.84 | 
|May 2013   |  |                       | 849.50 |  |         |  | 777.50 |      |  |  | 64.56 |  |  |  | 59.45 | 





| | * | For the period to 6 June 2013, the latest practicable date.
| | - | -----------------------------------------------------------

Subsequent Events



| |  | None applicable.
| | - | ----------------



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Exhibits

Pursuant to the rules and regulations of the SEC, National Grid has filed certain agreements as exhibits to this Annual Report on Form 20-F. These agreements may contain representations and
warranties by the parties to them. These representations and warranties have been made solely for the benefit of the other party or parties to such agreement and (i) may be intended not as statements of fact, but rather as a way of allocating
the risk to one of the parties to such agreements if those statements turn out to be inaccurate, (ii) may have been qualified by disclosures that were made to such other party or parties and that either have been reflected in the companys
filings or are not required to be disclosed in those filings, (iii) may apply materiality standards different from what may be viewed as material to investors and (iv) were made only as of the date of such agreements or such other date or
dates as may be specified in such agreements.

In accordance with the instructions to Item 2(b)(i) of the
Instructions to Exhibits to the Form 20-F, National Grid agrees to furnish to the SEC, upon request, a copy of any instrument relating to long-term debt that does not exceed 10 percent of the total assets of National Grid and its
subsidiaries on a consolidated basis.



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|       |  |  |  |                                                                                                                                                                                                                                                                                                                           |  |  |  |                          
|------ |  |  |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  |  | -------------------------
|       |  |  |  | Description                                                                                                                                                                                                                                                                                                               |  |  |  |                          
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|1.1    |  |  |  | Articles of Association of National Grid plc adopted by Special Resolution passed on 30 July 2012.                                                                                                                                                                                                                        |  |  |  | Filed herewith           
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(a)   |  |  |  | Amended and restated Deposit Agreement dated as of 23 May 2013 among National Grid plc and The Bank of New York Mellon, as Depository, and all Owners and
Holders from time to time of American Depositary Shares issued thereunder. (Exhibit 1 to National Grid plc Form F-6 dated 15 May 2013 File No. 333-178045)      |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).1 |  |  |  | Amended and Restated Trust Deed dated 26 July 2010 among National Grid plc, National Grid Electricity Transmission plc and the Law Debenture Trust Corporation
p.l.c. relating to a 15,000,000,000 Euro Medium Term Note Programme. (Exhibit 2(b).1 to National Grid plc Form 20-F dated 13 June 2011 File No. 1-14958)  |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).2 |  |  |  | Amended and Restated Trust Deed dated 18 February 2011 among National Grid Gas plc, National Grid Gas Finance (no 1) plc and the Law Debenture Trust Corporation
p.l.c relating to a 10,000,000,000 Euro Medium Term Note Programme. (Exhibit 2(b).2 to National Grid plc Form 20-F dated 13 June 2011 File No. 1-14958) |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).3 |  |  |  | Amended and Restated Trust Deed dated 22 February 2012 among National Grid Gas plc, National Grid Gas Finance (No 1)plc and the Law Debenture Trust Corporation
p.l.c. relating to a 10,000,000,000 Euro Medium Term Note Programme.(Exhibit 2.(b).3 to National Grid plc Form 20-F dated 12 June 2012 File No. 1-14958) |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).4 |  |  |  | Amended and Restated Trust Deed dated 2 August 2011 among National Grid plc, National Grid Electricity Transmission plc and the Law Debenture Trust Corporation
p.l.c. relating to a 15,000,000,000 Euro Medium Term Note Programme. Exhibit 2.(b).5 to National Grid plc Form 20-F dated 12 June 2012 File No. 1-14958) |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).5 |  |  |  | Amended and Restated Trust Deed dated 27 March 2013 among National Grid Gas plc, National Grid Gas Finance (No 1)plc and the Law Debenture Trust Corporation
p.l.c. relating to a 10,000,000,000 Euro Medium Term Note Programme.                                                                                        |  |  |  | Filed herewith           
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|2(b).6 |  |  |  | Amended and Restated Trust Deed dated 10 September 2012 among National Grid plc, National Grid Electricity Transmission plc and the Law Debenture Trust
Corporation p.l.c. relating to a 15,000,000,000 Euro Medium Term Note Programme.                                                                                 |  |  |  | Filed herewith           
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).1 |  |  |  | Service Agreement among The National Grid plc and Steven Holliday dated 1 April 2006. (Exhibit 4.(c).3 to National Grid Transco Form 20-F dated
19 June 2007 File No. 1-14958)                                                                                                                                            |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).2 |  |  |  | Service Agreement among The National Grid plc and Andrew Bonfield dated 1 November 2010. (Exhibit 4(c).20 to National Grid plc Form 20-F dated 13 June 2011 File
No 1-14958)                                                                                                                                              |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).3 |  |  |  | Service Agreement among National Grid Transco plc, National Grid Company plc and Nicholas Winser dated 28 April 2003. (Exhibit 4.8 to National Grid
Transco Form 20-F dated 16 June 2004 File No. 1-14958)                                                                                                                |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).4 |  |  |  | Employment Agreement among National Grid plc, National Grid USA and Thomas King dated 11 July 2007. (Exhibit 4 (c).9 to National Grid plc Form 20-F dated
17 June 2008 File No. 1-14958)                                                                                                                                  |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).5 |  |  |  | Letter of Appointment  Linda Adamany. (Exhibit 4 (c).9 to National Grid plc Form 20-F dated 19 June 2007 File
No. 1-14958)                                                                                                                                                                                               |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).6 |  |  |  | Letter of Appointment  Philip Aiken. (Exhibit 4 (c).11 to National Grid plc Form 20-F dated 17 June 2008 File No. 1-14958)                                                                                                                                                                                               |  |  |  | Incorporated by reference
|       |  |  |  |                                                                                                                                                                                                                                                                                                                          
|4(c).7 |  |  |  | Letter of Appointment  Sir Peter Gershon. (Exhibit 4(c).10 to National Grid plc Form 20-F dated 12 June 2012 File No. 1-14958)                                                                                                                                                                                           |  |  |  | Incorporated by reference



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##### Table of Contents

|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |  |  |  |                          
|------- |  |  |  | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |  |  |  | -------------------------
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).8  |  |  |  | Letter of Appointment Paul Golby. (Exhibit 4(c).11 to National Grid plc Form 20-F dated 12 June 2012 File No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                           |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).9  |  |  |  | Letter of Appointment  Ken Harvey. (Exhibit 4.10 to National Grid Transco Form 20-F dated 16 June 2004 File
No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                         |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).10 |  |  |  | Letter of Appointment  Ruth Kelly. (Exhibit 4(c).14 to National Grid plc Form 20-F dated 12 June 2012 File No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                          |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).11 |  |  |  | Letter of Appointment  Maria Richter. (Exhibit 4.14 to National Grid Transco Form 20-F dated 16 June 2004 File
No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                      |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).12 |  |  |  | Letter of Appointment  George Rose. (Exhibit 4.15 to National Grid Transco Form 20-F dated 16 June 2004 File
No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                        |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).13 |  |  |  | Letter of Appointment  Nora Mead Brownell.                                                                                                                                                                                                                                                                                                                                                                                                                                                       |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).14 |  |  |  | Letter of Appointment  Mark Williamson.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).15 |  |  |  | Letter of Appointment  Jonathan Dawson.                                                                                                                                                                                                                                                                                                                                                                                                                                                          |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).16 |  |  |  | National Grid plc Deferred Share Plan. (Exhibit 4.2 to National Grid plc S-8 dated 28 July 2011 File No. 333-175852)                                                                                                                                                                                                                                                                                                                                                                              |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).17 |  |  |  | National Grid Executive Share Option Plan 2002. (Exhibit 4 (c) to National Grid Group Form 20-F dated 21 June 2002 File
No. 1-14958)                                                                                                                                                                                                                                                                                                                                                              |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).18 |  |  |  | National Grid Group Share Matching Plan 2002. (Exhibit 4 (c) to National Grid Group Form 20-F dated 21 June 2002 File
No. 1-14958)                                                                                                                                                                                                                                                                                                                                                                |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).19 |  |  |  | National Grid Transco Performance Share Plan 2002 (as approved 23 July 2002 by a resolution of the shareholders of National Grid Group plc, adopted
17 October 2002 by a resolution of the Board of National Grid Group plc, amended 26 June 2003 by the Share Schemes Sub-Committee of National Grid Transco plc, and amended 5 May 2004 by the Share Schemes Sub-Committee of National Grid
Transco plc). (Exhibit 4.19 to National Grid Transco Form 20-F dated 16 June 2004 File No. 1-14958) |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).20 |  |  |  | National Grid Executive Share Option Scheme. (Exhibit 4D to National Grid Group S-8 dated 26 July 2001 File No. 333-65968)                                                                                                                                                                                                                                                                                                                                                                        |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).21 |  |  |  | Lattice Group Short Term Incentive Scheme (approved by a resolution of the shareholders of BG Group plc effective 23 October 2000; approved by a resolution
of the Board of National Grid Transco plc on 30 April 2004; amended by resolutions of the Board of Lattice Group plc effective on 21 October 2002 and 13 May 2004). (Exhibit 4.23 to National Grid Transco Form 20-F dated
16 June 2004 File No. 1-14958)                                                                             |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|4(c).22 |  |  |  | National Grid USA Companies Defined Contribution Supplemental Executive Retirement Plan. (Exhibit 4.2 to National Grid plc S-8 dated 23 October 2012 File
No. 14958)                                                                                                                                                                                                                                                                                                                             |  |  |  | Incorporated by reference
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|8       |  |  |  | List of subsidiaries.                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|12.1    |  |  |  | Certification of Steve Holliday pursuant to Rule 13a-14(a) of the Exchange Act.                                                                                                                                                                                                                                                                                                                                                                                                                   |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|12.2    |  |  |  | Certification of Andrew Bonfield pursuant to Rule 13a-14(a) of the Exchange Act.                                                                                                                                                                                                                                                                                                                                                                                                                  |  |  |  | Filed herewith           
|        |  |  |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
|13.1    |  |  |  | Certifications of Steve Holliday and Andrew Bonfield furnished pursuant to Rule 13a-14(b) of the Exchange Act (such certifications are not deemed filed for
purpose of Section 18 of the Exchange Act and not incorporated by reference in any filing under the Securities Act).                                                                                                                                                                                                                  |  |  |  | Filed herewith           



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|   |  |  |  |                                                                                                            |  |  |  |               
|-- |  |  |  | ---------------------------------------------------------------------------------------------------------- |  |  |  | --------------
|   |  |  |  |                                                                                                           
|15 |  |  |  | Consent of PricewaterhouseCoopers LLP, independent registered public accounting firm to National Grid plc. |  |  |  | Filed herewith



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##### Table of Contents

The registrant hereby certifies that it meets all of the requirements for
filing on Form 20-F and that it has duly caused and authorised the undersigned to sign this annual report on its behalf.



| |  |                   |  |                     |  | 
| |  | ----------------- |  | ------------------- |  | 
| |  | NATIONAL GRID PLC
| |  |                   | 
| |  | By:               |  | /s/ Andrew Bonfield |  | 
| |  |                   |  | Andrew Bonfield     |  | 
| |  |                   |  | Finance Director    |  | 

London, England

10 June 2013