**Exhibit 8**

----

 

List of Subsidiaries

|   |   | **Name**                                           |   |   |   | **Jurisdiction      of**               |   |   |
|--------|--------|----------------------------------------------------|--------|--------|--------|----------------------------------------|--------|--------|
|   |   |                                               |   |   |   | **Incorporation      or Organization** |   |   |
|        |
|   |   | 186K (EMPLOYERS) LIMITED                           |   |   |   | England &      Wales               |   |   |
|        |
|   |   | 186K LIMITED                                       |   |   |   | England & Wales                    |   |   |
|        |
|   |   | 99.999 LIMITED                                     |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA CORPORATE VENTURES      LIMITED          |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA INC.                                     |   |   |   | Pennsylvania                           |   |   |
|        |
|   |   | ADVANTICA LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA QA LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA STONER LIMITED                           |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA TECHNOLOGIES (EMPLOYERS)      LTD        |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ADVANTICA TECHNOLOGIES INC                         |   |   |   | Delaware                               |   |   |
|        |
|   |   | ADVANTICA TECHNOLOGIES LIMITED                     |   |   |   | England & Wales                    |   |   |
|        |
|   |   | AEMC, L.L.C.                                       |   |   |   | Delaware                               |   |   |
|        |
|   |   | AERIAL GROUP LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | AERIAL UK LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | AGL SYSTEMS INTERNATIONAL      LIMITED             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | AMPLE DESIGN LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ARBUCKLE ACRES, INC                                |   |   |   | New York                               |   |   |
|        |
|   |   | ARTERION (EMPLOYERS) LIMITED                       |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ARTERION LIMITED                                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ARTERION TECHNOLOGIES LIMITED                      |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ASSETHALL LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | BASSLINK PTY LIMITED                               |   |   |   | Australia                              |   |   |
|        |
|   |   | BEEGAS NOMINEES LIMITED                            |   |   |   | England & Wales                    |   |   |
|        |
|   |   | BRITISH TRANSCO CAPITAL INC                        |   |   |   | Delaware                               |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE INC                        |   |   |   | Delaware                               |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE (NO      1) LIMITED        |   |   |   | Cayman Islands                         |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE (NO      2) LIMITED        |   |   |   | Cayman Islands                         |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE (NO      3) LIMITED        |   |   |   | England & Wales                    |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE (NO      5) LIMITED        |   |   |   | England & Wales                    |   |   |
|        |
|   |   | BRITISH TRANSCO FINANCE (NO      6)                |   |   |   | Cayman Islands                         |   |   |
|        |
|   |   | BRITISH TRANSCO INTERNATIONAL      FINANCE BV      |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | BSC CO LIMITED                                     |   |   |   | England & Wales                    |   |   |
|        |
|   |   | CENTRAL EUROPE TELCOM HOLDINGS      B.V.           |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | COGSYS LIMITED                                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | CONTIGUOUS LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | EASTLANDS (BENEFITS ADMINISTRATION)      LIMITED   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | EASTLANDS LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ELECTRACOM LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ELEXON LIMITED                                     |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ENERGI LIMITED                                     |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ENERGIS SERVICES LIMITED                           |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ENERGY MARKET OPERATIONS LIMITED                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ENERGY SETTLEMENTS AND INFORMATION      SERVICES   |   |   |   | England & Wales                    |   |   |
|   |   | LIMITED                                            |   |   |   |                                   |   |   |
|        |
|   |   | ENEX OPERATIONS LIMITED                            |   |   |   | England & Wales                    |   |   |
|        |
|   |   | ENMO LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | EPFA LIMITED                                       |   |   |   | England & Wales                    |   |   |
|        |
|   |   | EPFAL LIMITED                                      |   |   |   | England & Wales                    |   |   |
|        |
|   |   | EUA BIOTEN, INC.                                   |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | EUA ENERGY INVESTMENT CORPORATION                  |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | EUA FRC INVESTMENT 1                               |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | FASTNET CALOOSAHATCHEE COMMUNICATIONS      LIMITED |   |   |   | British Virgin Islands                 |   |   |
|        |
|   |   | FIRST CONNECT LIMITED                              |   |   |   | England & Wales                    |   |   |
|        |
|   |   | FIRST CONNECT UTILITIES LIMITED                    |   |   |   | England & Wales                    |   |   |
|        |
|   |   | FIRST POINT SERVICES LIMITED                       |   |   |   | England & Wales                    |   |   |
|        |
|   |   | FIRST POINT SOLUTIONS LIMITED                      |   |   |   | England & Wales                    |   |   |
|        |

----

 

|   |   | **Name**                                          |   |   |   | **Jurisdiction of**               |   |   |
|--------|--------|---------------------------------------------------|--------|--------|--------|-----------------------------------|--------|--------|
|   |   |                                              |   |   |   | **Incorporation or Organization** |   |   |
|        |
|   |   | FPLTELECOM LIMITED                                |   |   |   | England &      Wales          |   |   |
|        |
|   |   | FULCRUM CONNECTIONS (EMPLOYERS)      LIMITED      |   |   |   | England & Wales               |   |   |
|        |
|   |   | FULCRUM CONNECTIONS LIMITED                       |   |   |   | England & Wales               |   |   |
|        |
|   |   | GAS RESEARCH & TECHNOLOGY      CENTRE LIMITED |   |   |   | England & Wales               |   |   |
|        |
|   |   | GEMSTONE SOFTWARE LIMITED                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRANITE STATE ELECTRIC COMPANY                    |   |   |   | New Hampshire                     |   |   |
|        |
|   |   | GRIDAMERICA LLC                                   |   |   |   | Delaware                          |   |   |
|        |
|   |   | GRID INTERNATIONAL LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRID INVESTMENT HOLDINGS LIMITED                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRIDCOM AERIAL SITES PLC                          |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRIDCOM LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRIDCOM (UK) LIMITED                              |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRIDMET LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRIDNAT LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRID ONE LIMITED                                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | GRTC LIMITED                                      |   |   |   | England & Wales               |   |   |
|        |
|   |   | HCE PEPPERELL, INC                                |   |   |   | New York                          |   |   |
|        |
|   |   | HOLDCO PARTICIPACOES LTDA      **(50%)**          |   |   |   | Brazil                            |   |   |
|        |
|   |   | HUDSON POINTE, INC                                |   |   |   | New York                          |   |   |
|        |
|   |   | INFRASTRUCTURE TECHNOLOGY      GROUP LIMITED      |   |   |   | England & Wales               |   |   |
|        |
|   |   | INFRASTRUCTURE TECHNOLOGY      HOLDINGS BV        |   |   |   | The Netherlands                   |   |   |
|        |
|   |   | INTELIG TELECOMUNICACOES LTDA      **(50%)**      |   |   |   | Brazil                            |   |   |
|        |
|   |   | INTERNATIONAL POWER SYSTEMS      LIMITED          |   |   |   | England & Wales               |   |   |
|        |
|   |   | IPS LIMITED                                       |   |   |   | England & Wales               |   |   |
|        |
|   |   | ITG LIMITED                                       |   |   |   | England & Wales               |   |   |
|        |
|   |   | JACKSON & LUTTMAN LIMITED                     |   |   |   | England & Wales               |   |   |
|        |
|   |   | JOINT RADIO COMPANY LIMITED      **(50****%)**    |   |   |   | England & Wales               |   |   |
|        |
|   |   | JVCO PARTICIPACOES LTDA **(50%)**                 |   |   |   | Brazil                            |   |   |
|        |
|   |   | LAND MANAGEMENT AND DEVELOPMENT,      INC         |   |   |   | New York                          |   |   |
|        |
|   |   | LANDRANCH LIMITED                                 |   |   |   | England & Wales               |   |   |
|        |
|   |   | LANDWEST, INC                                     |   |   |   | New York                          |   |   |
|        |
|   |   | LATTICE ENERGY SERVICES (EMPLOYERS)      LTD      |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE ENERGY SERVICES LIMITED                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE ENTERPRISES LIMITED                       |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP EMPLOYEE BENEFIT      TRUST LIMITED |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP (EMPLOYERS)      LTD                |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP HOLDINGS (EMPLOYERS)      LTD       |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP HOLDINGS LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP INTERNATIONAL      HOLDINGS LIMITED |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP PLC                                 |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP SERVICES (AGENCY)      LIMITED      |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP SERVICES LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP TRUSTEES LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE GROUP US HOLDINGS,      INC.              |   |   |   | Delaware                          |   |   |
|        |
|   |   | LATTICE INTELLECTUAL PROPERTY      LIMITED        |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE LAND DEVELOPMENTS      LIMITED            |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE LAND INVESTMENTS LIMITED                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE LNG HOLDINGS LIMITED                      |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE LNG LIMITED                               |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE OPSCO LIMITED                             |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE PROPERTY (EMPLOYERS)      LIMITED         |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE PROPERTY HOLDINGS      LIMITED            |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE PROPERTY PORTFOLIO      LIMITED           |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE TELECOM FINANCE (NO      1) LIMITED       |   |   |   | Isle of Man                       |   |   |
|        |
|   |   | LATTICE TELECOMMUNICATIONS      ASSET DEVELOPMENT |   |   |   | England & Wales               |   |   |
|   |   | COMPANY LIMITED                                   |   |   |   |                              |   |   |
|        |
|   |   | LATTICE TELECOMS LIMITED                          |   |   |   | England & Wales               |   |   |
|        |
|   |   | LATTICE UTILITIES LIMITED                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | LOUGHBOROUGH PARK MANAGEMENT      LIMITED         |   |   |   | England & Wales               |   |   |
|        |
|   |   | MAINSTREAM FORTY-SEVEN LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | MANQUEHUE NET S.A.                                |   |   |   | Chile                             |   |   |
|        |
|   |   | MASSACHUSETTS ELECTRIC COMPANY                    |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | METROWEST REALTY LLC                              |   |   |   | Delaware                          |   |   |
|        |
|   |   | MINOA FARMS DEVELOPMENT CO.      LLC              |   |   |   | New York                          |   |   |
|        |
|   |   | MOREAU PARK, INC                                  |   |   |   | New York                          |   |   |
|        |
|   |   | NANTUCKET ELECTRIC COMPANY                        |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NATGRID FINANCE HOLDINGS LIMITED                  |   |   |   | England & Wales               |   |   |
|        |

----

 

|   |   | **Name**                                                   |   |   |   | **Jurisdiction      of**               |   |   |
|--------|--------|------------------------------------------------------------|--------|--------|--------|----------------------------------------|--------|--------|
|   |   |                                                       |   |   |   | **Incorporation      or Organisation** |   |   |
|        |
|   |   | NATGRID FINANCE LIMITED                                    |   |   |   | England &      Wales               |   |   |
|        |
|   |   | NATGRID HOLDINGS LIMITED                                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATGRID INVESTMENTS LIMITED                                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATGRID LIMITED                                            |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID AUSTRALIA GP      PTY LTD                    |   |   |   | Australia                              |   |   |
|        |
|   |   | NATIONAL GRID AUSTRALIA LLP                                |   |   |   | Australia                              |   |   |
|        |
|   |   | NATIONAL GRID AUSTRALIA PTY      LIMITED                   |   |   |   | Cayman Islands                         |   |   |
|        |
|   |   | NATIONAL GRID BRAZIL B.V.                                  |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID BRAZIL FINANCE                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID BRAZIL TRANSMISSION      B.V.                |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID CENTRAL EUROPE      B.V.                     |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID CHILE B.V.                                   |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID COMMUNICATIONS,      INC.                    |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | NATIONAL GRID COMPANY PLC                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID EIGHTEEN LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID EIGHT LIMITED                                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID ELEVEN LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID FIFTEEN LIMITED                              |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID FINANCE B.V.                                 |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID FIVE LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID FOUR LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID FOURTEEN LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID GENERAL PARTNERSHIP                          |   |   |   | Delaware                               |   |   |
|        |
|   |   | NATIONAL GRID GOLD LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID HOLDINGS B.V.                                |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID HOLDINGS INC.                                |   |   |   | Delaware                               |   |   |
|        |
|   |   | NATIONAL GRID HOLDINGS LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID HOLDINGS ONE      PLC                        |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID HOLLAND LIMITED                              |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID INDIA B.V.                                   |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID INDUS B.V.                                   |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID INTERNATIONAL      LIMITED                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (IOM) UK LTD                                 |   |   |   | Isle of Man                            |   |   |
|        |
|   |   | NATIONAL GRID (IRELAND) 1      LIMITED                     |   |   |   | Republic of Ireland                    |   |   |
|        |
|   |   | NATIONAL GRID (IRELAND) 2      LIMITED                     |   |   |   | Republic of Ireland                    |   |   |
|        |
|   |   | NATIONAL GRID IRELAND THREE                                |   |   |   | Republic of Ireland                    |   |   |
|        |
|   |   | NATIONAL GRID JERSEY HOLDINGS      FIVE LIMITED            |   |   |   | Jersey                                 |   |   |
|        |
|   |   | NATIONAL GRID JERSEY HOLDINGS      FOUR LIMITED            |   |   |   | Jersey                                 |   |   |
|        |
|   |   | NATIONAL GRID JERSEY HOLDINGS      THREE LIMITED           |   |   |   | Jersey                                 |   |   |
|        |
|   |   | NATIONAL GRID JERSEY HOLDINGS      TWO LTD (IN LIQ’N) |   |   |   | Jersey                                 |   |   |
|        |
|   |   | NATIONAL GRID MANQUEHUE B.V.                               |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID MARKET SERVICES      LIMITED                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID NETHERLANDS      ONE BV                      |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID NETHERLANDS      THREE BV                    |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID NETHERLANDS      TWO BV                      |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID NINE LIMITED                                 |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID NINETEEN LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID NOMINEES LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID ONE LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID OVERSEAS LIMITED                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID OVERSEAS TWO      LIMITED                    |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID POLAND B.V.                                  |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID PROCUREMENT      BV                          |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID PROPERTIES LIMITED                           |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID RESERVE IX B.V.                              |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID RESERVE VII      B.V.                        |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID RESERVE VIII      B.V.                       |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID RESERVE X B.V.                               |   |   |   | The Netherlands                        |   |   |
|        |
|   |   | NATIONAL GRID SEVEN LIMITED                                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID SEVENTEEN LIMITED                            |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID SIX LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID SIXTEEN LIMITED                              |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TEN                                          |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID THREE LIMITED                                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSCO EUROPE      LIMITED                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSCO GROUP      LIMITED                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSCO HOLDINGS      LIMITED                |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSCO INTERNATIONAL      LIMITED           |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSCO LIMITED                              |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TRANSMISSION      SERVICES CORPORATION       |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | NATIONAL GRID TWELVE LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TWENTY LIMITED                               |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TWENTY ONE LIMITED                           |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID TWO LIMITED                                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID USA                                          |   |   |   | Delaware                               |   |   |
|        |
|   |   | NATIONAL GRID USA SERVICE      COMPANY, INC.               |   |   |   | Massachusetts                          |   |   |
|        |
|   |   | NATIONAL GRID (US) HOLDINGS      LIMITED                   |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) INVESTMENTS                             |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) INVESTMENTS      2                      |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) INVESTMENTS      3                      |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) INVESTMENTS      4                      |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) INVESTMENTS      5                      |   |   |   | England & Wales                    |   |   |
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|   |   | NATIONAL GRID (US) INVESTMENTS      6                      |   |   |   | England & Wales                    |   |   |
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|   |   | NATIONAL GRID US LLC                                       |   |   |   | Delaware                               |   |   |
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|   |   | NATIONAL GRID (US) PARTNER      1 LIMITED                  |   |   |   | England & Wales                    |   |   |
|        |
|   |   | NATIONAL GRID (US) PARTNER      2 LIMITED                  |   |   |   | England & Wales                    |   |   |

----

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|   |   | **Name**                                           |   |   |   | **Jurisdiction      of**          |   |   |
|--------|--------|----------------------------------------------------|--------|--------|--------|-----------------------------------|--------|--------|
|   |   |                                               |   |   |   | **Incorporation or Organization** |   |   |
|        |
|   |   | NATIONAL GRID ZAMBIA B.V.                          |   |   |   | The Netherlands                   |   |   |
|        |
|   |   | NATIONAL GRID ZAMBIA LIMITED                       |   |   |   | England & Wales               |   |   |
|        |
|   |   | NEES COMMUNICATIONS, INC                           |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEES ENERGY, INC.                                  |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEES TELECOMMUNICATIONS CORP.                      |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NETMAP LIMITED                                     |   |   |   | England & Wales               |   |   |
|        |
|   |   | NETWORK MAPPING LIMITED                            |   |   |   | England & Wales               |   |   |
|        |
|   |   | NEW ENGLAND ELECTRIC TRANSMISSION      CORPORATION |   |   |   | New Hampshire                     |   |   |
|        |
|   |   | NEW ENGLAND ENERGY INCORPORATED                    |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEW ENGLAND HYDRO FINANCE      COMPANY, INC.       |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEW ENGLAND HYDRO-TRANSMISSION      CORPORATION    |   |   |   | New Hampshire                     |   |   |
|        |
|   |   | NEW ENGLAND HYDRO-TRANSMISSION      ELECTRIC       |   |   |   | Massachusetts                     |   |   |
|   |   | COMPANY, INC.                                      |   |   |   |                              |   |   |
|        |
|   |   | NEW ENGLAND POWER COMPANY                          |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEW ENGLAND WHOLESALE ELECTRIC      COMPANY        |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NEWHC, INC.                                        |   |   |   | Massachusetts                     |   |   |
|        |
|   |   | NGC DO BRASIL PARTICIPACOES      LTDA              |   |   |   | Brazil                            |   |   |
|        |
|   |   | NGC EMPLOYEE SHARES TRUSTEE      LIMITED           |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC ENERGY LIMITED                                 |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC (GB) LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | NG CHICAGO I, LLC                                  |   |   |   | Delaware                          |   |   |
|        |
|   |   | NG CHICAGO II, LLC                                 |   |   |   | Delaware                          |   |   |
|        |
|   |   | NGC INDUS LIMITED                                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC IT LIMITED                                     |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC LEASING LIMITED                                |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC LEISURE LIMITED                                |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC TWO LIMITED                                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGC ZAMBIA LIMITED                                 |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGG (DELAWARE) LLC                                 |   |   |   | Delaware                          |   |   |
|        |
|   |   | NGG FINANCE A ISLANDI EHF                          |   |   |   | Iceland                           |   |   |
|        |
|   |   | NGG FINANCE PLC                                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGG HOLDINGS A ISLANDI EHF                         |   |   |   | Iceland                           |   |   |
|        |
|   |   | NGG LIMITED                                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGG TELECOMS HOLDINGS LIMITED                      |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGG TELECOMS INVESTMENT LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGG TELECOMS LIMITED                               |   |   |   | England & Wales               |   |   |
|        |
|   |   | NG INVESTMENTS LIMITED                             |   |   |   | Jersey                            |   |   |
|        |
|   |   | NG JERSEY LIMITED                                  |   |   |   | Jersey                            |   |   |
|        |
|   |   | NG MALTA ONE LIMITED                               |   |   |   | Gibraltar                         |   |   |
|        |
|   |   | NG MALTA TWO LIMITED                               |   |   |   | Malta                             |   |   |
|        |
|   |   | NG PROCUREMENT HOLDINGS LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | NG PROPERTY DEVELOPMENTS LIMITED                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGT INSURANCE COMPANY (GUERNSEY)      LIMITED      |   |   |   | Guernsey                          |   |   |
|        |
|   |   | NGT INSURANCE COMPANY (IRELAND)      LIMITED       |   |   |   | Republic of Ireland               |   |   |
|        |
|   |   | NGT INSURANCE COMPANY (ISLE      OF MAN) LIMITED   |   |   |   | Isle of Man                       |   |   |
|        |
|   |   | NGT METERING LIMITED                               |   |   |   | England & Wales               |   |   |
|        |
|   |   | NGT ONSTREAM LIMITED                               |   |   |   | England & Wales               |   |   |
|        |
|   |   | NIAGARA MOHAWK ENERGY, INC.                        |   |   |   | Delaware                          |   |   |
|        |
|   |   | NIAGARA MOHAWK HOLDINGS, INC.                      |   |   |   | New York                          |   |   |
|        |
|   |   | NIAGARA MOHAWK POWER CORPORATION                   |   |   |   | New York                          |   |   |
|        |
|   |   | NM PROPERTIES, INC.                                |   |   |   | New York                          |   |   |
|        |
|   |   | NM RECEIVABLES CORP. II                            |   |   |   | New York                          |   |   |
|        |
|   |   | NM RECEIVABLES LLC                                 |   |   |   | New York                          |   |   |
|        |
|   |   | NM URANIUM, INC.                                   |   |   |   | Texas                             |   |   |
|        |
|   |   | NT LIMITED                                         |   |   |   | England & Wales               |   |   |
|        |

----

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|   |   | **Name**                                           |   |   |   | **Jurisdiction of**               |   |   |
|--------|--------|----------------------------------------------------|--------|--------|--------|-----------------------------------|--------|--------|
|   |   |                                               |   |   |   | **Incorporation or Organization** |   |   |
|        |
|   |   | ON STREAM ASSET MANAGEMENT      SERVICES LIMITED   |   |   |   | England &      Wales          |   |   |
|        |
|   |   | ON STREAM.COM LIMITED                              |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM DATA MANAGEMENT      LIMITED             |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM DATA PROVISION LIMITED                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM METERING LIMITED                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM METER OPERATIONS      LIMITED            |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM METER READING SERVICES      LIMITED      |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM SERVICES LIMITED                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM SOLUTIONS LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM UTILITIES LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | ON STREAM WORLDWIDE LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | OPINAC ENERGY CORPORATION                          |   |   |   | Province of Ontario, Canada       |   |   |
|        |
|   |   | OPINAC NORTH AMERICA, INC.                         |   |   |   | Delaware                          |   |   |
|        |
|   |   | OPROPRCO, INC                                      |   |   |   | New York                          |   |   |
|        |
|   |   | ORIGINAL BASSLINK LIMITED                          |   |   |   | Australia                         |   |   |
|        |
|   |   | ORIGINAL BASSLINK PTY LTD                          |   |   |   | Australia                         |   |   |
|        |
|   |   | PORT GREENWICH LIMITED                             |   |   |   | England & Wales               |   |   |
|        |
|   |   | POWERCOM LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | RENOVA LLC                                         |   |   |   | USA                               |   |   |
|        |
|   |   | RISX ENVIRONMENTAL MANAGEMENT      LIMITED         |   |   |   | Scotland                          |   |   |
|        |
|   |   | RISX LIMITED                                       |   |   |   | Scotland                          |   |   |
|        |
|   |   | RIVERVIEW GALUSHA, LLC                             |   |   |   | New York                          |   |   |
|        |
|   |   | RIVERVIEW, INC                                     |   |   |   | New York                          |   |   |
|        |
|   |   | RT MASTS LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | RT MASTS (PROPERTY) LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | SALMON SHORES, INC                                 |   |   |   | New York                          |   |   |
|        |
|   |   | SALMON SHORES PARTNERSHIP                          |   |   |   | New York                          |   |   |
|        |
|   |   | SCC UNO S.A.                                       |   |   |   | Chile                             |   |   |
|        |
|   |   | SECONDSITE ESTATES LIMITED                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE HOLDINGS LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE LAND DEVELOPMENTS      LIMITED          |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE LAND INVESTMENTS      LIMITED           |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PORTFOLIO SOLUTIONS      LIMITED        |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PROPERTY HOLDINGS      LIMITED          |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PROPERTY LIMITED                        |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PROPERTY NOMINEES      (NO 1) LIMITED   |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PROPERTY NOMINEES      (NO 2) LIMITED   |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE PROPERTY PORTFOLIO      LIMITED         |   |   |   | England & Wales               |   |   |
|        |
|   |   | SECONDSITE REGENERATION LIMITED                    |   |   |   | England & Wales               |   |   |
|        |
|   |   | SILICA NET S.A.                                    |   |   |   | Chile                             |   |   |
|        |
|   |   | SILICA NETWORKS ARGENTINA      S.A.                |   |   |   | Argentina                         |   |   |
|        |
|   |   | SILICA NETWORKS CHILE S.A.                         |   |   |   | Chile                             |   |   |
|        |
|   |   | SKYMASTS LIMITED                                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | SN INVESTMENT ARGENTINA S.A.                       |   |   |   | Chile                             |   |   |
|        |
|   |   | SOFRER SA                                          |   |   |   | France                            |   |   |
|        |
|   |   | SSE TRANSCO LIMITED                                |   |   |   | England & Wales               |   |   |
|        |
|   |   | SSITET ESPANA NETWORK SERVICES      SA             |   |   |   | Spain                             |   |   |
|        |
|   |   | SST GMBH                                           |   |   |   | Germany                           |   |   |
|        |
|   |   | SST TELECOM LIMITED                                |   |   |   | England & Wales               |   |   |
|        |
|   |   | SST TOWERS COMMUNICATIONS      SAS                 |   |   |   | France                            |   |   |
|        |
|   |   | STARGAS NOMINEES LIMITED                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | STC INTERNATIONAL HOLDINGS      LIMITED            |   |   |   | England & Wales               |   |   |
|        |
|   |   | STONER ASSOCIATES AUSTRALASIA      PTY LTD         |   |   |   | Australia                         |   |   |
|        |
|   |   | STONER ASSOCIATES EUROPE LIMITED                   |   |   |   | England & Wales               |   |   |
|        |
|   |   | SUPERGRID LIMITED                                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELDATA INTERNATIONAL LIMITED                      |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELDATA SERVICES LIMITED                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELDATA SOLUTIONS LIMITED                          |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELECOM ELECTRIC LIMITED                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELECOM INTERNATIONAL HOLDINGS      LIMITED        |   |   |   | England & Wales               |   |   |
|        |
|   |   | TELINK LIMITED                                     |   |   |   | England & Wales               |   |   |
|        |
|   |   | THE ELECTRICITY TRANSMISSION      COMPANY LIMITED  |   |   |   | England & Wales               |   |   |
|        |
|   |   | THE NARRAGANSETT ELECTRIC      COMPANY             |   |   |   | Rhode Island                      |   |   |
|        |
|   |   | THE NATIONAL GRID GROUP QUEST      TRUSTEE COMPANY |   |   |   | England & Wales               |   |   |
|   |   | LIMITED                                            |   |   |   |                              |   |   |
|        |

----

Back to Contents

|   |   | **Name**                                              |   |   |   | **Jurisdiction of**               |   |   |
|--------|--------|-------------------------------------------------------|--------|--------|--------|-----------------------------------|--------|--------|
|   |   |                                                  |   |   |   | **Incorporation or Organization** |   |   |
|        |
|   |   | THE NATIONAL GRID INVESTMENTS      COMPANY            |   |   |   | England &      Wales          |   |   |
|        |
|   |   | TOREN CV                                              |   |   |   | The Netherlands                   |   |   |
|        |
|   |   | TRANSCO ASSET MAINTENANCE      LIMITED                |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO ASSET MAINTENANCE      (SCOTLAND) LIMITED     |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO ASSET MAINTENANCE      (WALES) LIMITED        |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO ASSET MANAGEMENT LIMITED                      |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO ASSET MANAGEMENT (SCOTLAND)      LIMITED      |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO ASSET MANAGEMENT (WALES)      LIMITED         |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO CONNECTIONS LIMITED                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO CONNECTIONS (SCOTLAND)      LIMITED           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO CONNECTIONS (WALES)      LIMITED              |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO EMERGENCY SERVICES      LIMITED               |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO EMERGENCY SERVICES      (SCOTLAND) LIMITED    |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO EMERGENCY SERVICES      (WALES) LIMITED       |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO (EMPLOYERS) LTD                               |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO HOLDINGS (EMPLOYERS)      LTD                 |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO HOLDINGS PLC                                  |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO LNG STORAGE LIMITED                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO METERING SERVICES      LIMITED                |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO METERING SERVICES      (SCOTLAND) LIMITED     |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINE CONSTRUCTORS      LIMITED            |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINE CONSTRUCTORS      (SCOTLAND) LIMITED |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINE CONSTRUCTORS      (WALES) LIMITED    |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINES LIMITED                             |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINES (SCOTLAND)      LIMITED             |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PIPELINES (WALES)      LIMITED                |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO PLC                                           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSCO TELECOMMUNICATIONS      ASSET DEVELOPMENT     |   |   |   | England & Wales               |   |   |
|   |   | COMPANY LIMITED                                       |   |   |   |                              |   |   |
|        |
|   |   | TRANSCO TRANSPORTATION COMPANY      LIMITED           |   |   |   | England & Wales               |   |   |
|        |
|   |   | TRANSGRID LIMITED                                     |   |   |   | England & Wales               |   |   |
|        |
|   |   | UPPER HUDSON DEVELOPMENT INC                          |   |   |   | New York                          |   |   |
|        |
|   |   | UTILITY METERING SERVICES      LIMITED                |   |   |   | England & Wales               |   |   |
|        |
|   |   | VESAS LIMITED                                         |   |   |   | England & Wales               |   |   |
|        |
|   |   | WAYFINDER GROUP, INC.                                 |   |   |   | Massachusetts                     |   |   |
|        |

----