Document:

<PAGE>

                                                                  Exhibit 10.19
                            DRI Services Agreement

     This DRI Services Agreement (this "Agreement") is entered into as of the
1st day of January, 1999, by and between VIRGINIA ELECTRIC AND POWER COMPANY, a
Virginia public service (the "Company"), DOMINION RESOURCES SERVICES, INC., a
Virginia corporation, ("DRI Services"), and CONSOLIDATED NATURAL GAS SERVICE
COMPANY, INC., a Delaware corporation ("CNG Services"). DRI Services and CNG
Services are sometimes referred to herein as a "Service Company" and,
collectively, as the "Service Companies".

     WHEREAS, each of the Company, DRI Services and CNG Services is a direct or
indirect wholly owned subsidiary of Dominion Resources, Inc. ("DRI");

     WHEREAS, each of the Service Companies has been formed for the purpose of
providing administrative, management and other services to DRI and its
subsidiaries ("System Companies"); and

     WHEREAS, the Company believes that it is in the interest of the Company to
provide for an arrangement whereby the Company may, from time to time and at the
option of the Company, agree to purchase such administrative, management and
other services from either one or both of the Service Companies;

     NOW, THEREFORE, in consideration of the mutual covenants contained herein
and other valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto, intending to be legally bound, hereby
agree as follows:

     I.    SERVICES OFFERED. Exhibit I hereto lists and describes all of the
           ----------------
services that are available from either of the Service Companies. Each of the
Service Companies hereby offers to supply those services to Company and to other
subsidiaries of DRI. Such services are and will be provided to the Company only
at the request of the Company.

     II.   SERVICES SELECTED.
           -----------------

     A.     Initial Selection of Services. Exhibit II lists the services Company
hereby agrees to receive from DRI Services. Exhibit III lists the services
Company hereby agrees to receive from CNG Services.

     B.     Annual Selection of Services. Each Service Company shall send an
annual service proposal form to the Company on or about December 1 listing
services proposed for the coming calendar year. By December 31, the Company
shall notify each Service Company of the services it has elected to receive from
that Service Company during the following calendar year.
<PAGE>

     III. PERSONNEL. The Service Companies will provide services by utilizing
          ---------
the services of such executives, accountants, financial advisers, technical
advisers, attorneys, engineers, geologists and other persons as have the
necessary qualifications.

     If necessary, the Service Companies, after consultation with the Company,
may also arrange for the services of nonaffiliated experts, consultants and
attorneys in connection with the performance of any of the services supplied
under this Agreement.

     IV.  COMPENSATION AND ALLOCATION. As and to the extent required by law, the
          ---------------------------
Service Companies will provide such services at cost. Exhibit IV hereof contains
rules for determining and allocating costs for DRI Services and CNG Services.

     V.   TERMINATION AND MODIFICATION.
          ----------------------------

     A.     Modification of Services. The Company may modify its selection of
services at any time during the calendar year by giving the relevant Service
Company written notice of the additional services it wishes to receive, and/or
the services it no longer wishes to receive, from the Service Company. The
requested modification in services shall take effect on the first day of the
first calendar month beginning at least thirty (30) days after the Company sent
written notice to the Service Company.

     B.     Modification of Other Terms and Conditions. No other amendment,
change or modification of this Agreement shall be valid, unless made in writing
and signed by all parties hereto.

     C.     Termination of this Agreement. The Company may terminate this
Agreement as to either or both of the Service Companies by providing sixty (60)
days advance written notice of such termination to the applicable Service
Company or Companies. Either Service Company may terminate this Agreement as to
the Company by providing sixty (60) days advance written notice of such
termination to the Company. The parties expressly agree that termination of this
Agreement by the Company as to one of the Service Companies shall not constitute
a termination of this Agreement with respect to the other Service Company and
that termination of this Agreement by either Service Company shall not affect
the obligations of the other Service Company hereunder to the Company.

     This Agreement is subject to termination or modification at any time to the
extent its performance may conflict with the provisions of the Public Utility
Holding Company Act of 1935, as amended ("1935 Act), or with any rule,
regulation or order of the Securities and Exchange Commission ("SEC") adopted
before or after the making of this Agreement. This Agreement shall be subject to
the approval of any state commission or other state regulatory body whose
approval is, by the laws of said state, a legal prerequisite to the execution
and delivery or the performance of this Agreement.

                                       2
<PAGE>

     VI.   NOTICE. Where written notice is required by this Agreement, said
           ------
notice shall be deemed given when mailed by United States registered or
certified mail, postage prepaid, return receipt requested, addressed as follows:

            a.  To the Company:

                Virginia Electric and Power Company
                701 East Cary Street
                Richmond, VA 23219-3932

            b.  To DRI Services:

                Dominion Resources Services, Inc.
                120 Tredegar Street
                Richmond, VA 23219

            c.  To CNG Services:

                Consolidated Natural Gas Service Company, Inc.
                CNG Tower
                625 Liberty Avenue
                Pittsburgh, PA 15222-3199

     VII.  GOVERNING LAW. This Agreement shall be governed by and construed in
           -------------
accordance with the laws of the respective states of incorporation of the
Service Companies, without regard to their respective conflict of laws
provisions.

     VIII. ENTIRE AGREEMENT. This Agreement, together with its exhibits,
           ----------------
constitutes the entire understanding and agreement of the parties with respect
to its subject matter, and effective upon the execution of this Agreement by the
respective parties hereof and thereto, any and all prior agreements,
understandings or representations with respect to this subject matter (except
for completion of obligations of CNG Services and Consolidated Natural Gas
Company ("CNG") and its subsidiaries arising before the merger of DRI and CNG
became effective) are hereby terminated and canceled in their entirety and are
of no further force or effect.

     IX.   WAIVER. No waiver by any party hereto of a breach of any provision of
           ------
this Agreement shall constitute a waiver of any preceding or succeeding breach
of the same or any other provision hereof.

     X.    ASSIGNMENT. This Agreement shall inure to the benefit of and shall be
           ----------
binding upon the parties and their respective successors and assigns. No
assignment of this Agreement or any party's rights, interests or obligations
hereunder may be made without the other party's consent, which shall not be
unreasonably withheld, delayed or conditioned.

                                       3
<PAGE>

     XI.   SEVERABILITY. If any provision or provisions of this Agreement shall
           ------------
be held to be invalid, illegal, or unenforceable, the validity, legality, and
enforceability of the remaining provisions shall in no way be affected or
impaired thereby.

     XII.  EFFECTIVE DATE. This Agreement is effective as to DRI and its
           --------------
subsidiaries, including DRI Services, as of January 1, 2000 and is effective as
to Consolidated Natural Gas Company ("CNG") and its subsidiaries, including CNG
Services, as of the closing of the proposed merger between DRI and CNG.

     XIII. VSCC APPROVAL. Pursuant to the Virginia State Corporation
           -------------
Commission's Order Approving Merger in Joint Petition of Dominion Resources,
Inc. and Consolidated Natural Gas Company, For approval of agreement and plan of
merger under Chapter 5 of Title 56 of the Code of Virginia, Case No. PUA990020,
issued on September 17, 1999, neither Virginia Power, Virginia Natural Gas, Inc.
nor any other DRI affiliate subject to regulation by the Commission shall have
any obligation under this Agreement except to the extent the Commission has
approved such obligation.

     XIV.  NCUC APPROVAL. Pursuant to the North Carolina Utilities Commission's
           -------------
("NCUC") Order Approving Merger In the Matter of Application by Dominion
Resources, Inc., for Authorization under G.S. 62-111 to Engage in a Business
Combination Transaction, Docket No. E-22, Sub 380, issued on October 18, 1999,
Virginia Electric and Power Company, d/b/a North Carolina Power:

            (i)  may not make or incur a charge under this Agreement except in
                 accordance with North Carolina law and the rules, regulations
                 and orders of the NCUC promulgated thereunder; and

            (ii) may not seek to reflect in rates any cost incurred or revenue
                 level earned under an agreement subject to the 1935 Act to the
                 extent disallowed by the NCUC.

     IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of the date first above mentioned.

Attest:                            By Company:

_____________________________            _______________________________________
                                         _______________________________________

                                       4
<PAGE>

Attest:                            By DRI Services:

_____________________________            _______________________________________
                                         _______________________________________

Attest:                            By CNG Services:

_____________________________            _______________________________________
                                         _______________________________________

                                       5
<PAGE>

                                                                       EXHIBIT I

                    DESCRIPTION OF SERVICES OFFERED BY EACH
           SERVICE COMPANY UNDER THIS AND SIMILAR SERVICE CONTRACTS

          1.   Accounting.  Provide advice and assistance to System Companies in
               ----------
accounting matters, including the development of accounting practices,
procedures and controls, the maintenance of the general ledger and related
subsidiary systems, the preparation and analysis of financial reports, and the
processing of certain accounts such as accounts payable, payroll, customer and
cash management.

          2.   Auditing.  Periodically audit the accounting records and other
               --------
records maintained by System Companies and coordinating their examination, where
applicable, with that of independent public accountants. The audit staff will
report on their examination and submit recommendations, as appropriate, on
improving methods of internal control and accounting procedures.

          3.   Legal and Regulatory.  Provide advice and assistance with respect
               --------------------
to legal and regulatory issues as well as regulatory compliance, including 1935
Act authorizations and compliance and regulatory matters under other Federal and
State laws.

          4.   Information Technology, Electronic Transmission and Computer
               ------------------------------------------------------------
Services.  Provide the organization and resources for the operation of an
--------
information technology function including the development, implementation and
operation of a centralized data processing facility and the management of a
telecommunications network. This function includes the central processing of
computerized applications and support of individual applications in System
Companies. Develop, implement, and process those computerized applications for
System Companies that can be economically best accomplished on a centralized
basis.

          5.   Software Pooling.  Accept from  System Companies ownership of and
               ----------------
rights to use, assign, license or sub-license all software owned, acquired or
developed by or for System Companies which System Companies can and do transfer
or assign to it. Preserve and protect the rights to all such software to the
extent reasonable and appropriate under the circumstances; license System
Companies, on a non-exclusive, no-charge or at-cost basis, to use all software
which the relevant Service Company has the right to sell, license or sub-
license; and, at the relevant System Companies' expense, permit System Companies
to enhance any such software and license others to use all such software and
enhancements to the extent that the relevant Service Companies shall have the
legal right to so permit.
<PAGE>

          6.   Employee Benefits/Pension Investment.  Provide central accounting
               ------------------------------------
for employee benefit and pension plans of System Companies. Advise and assist
System Companies in the administration of such plans and prepare and maintain
records of employee and company accounts under the said plans, together with
such statistical data and reports as are pertinent to the plans.

          7.   Employee Relations.  Advise and assist System Companies in the
               ------------------
formulation and administration of employee relations policies and programs
relating to the relevant System Companies' labor relations, personnel
administration, training, wage and salary administration and safety.

          8.   Operations.  Advise and assist System Companies in the study,
               ----------
planning, engineering and construction of energy plant facilities of each System
Company and of the System as a whole, and advise, assist and manage the
planning, engineering (including maps and records) and construction operations
of System Companies. Develop long-range operational programs for all the System
Companies and advise and assist each such System Company in the coordination of
such programs with the programs of the other System Companies.

          9.   Executive and Administrative.  Advise and assist System Companies
               ----------------------------
in the solution of major problems and in the formulation and execution of the
general plans and policies of System Companies. Advise and assist System
Companies as to operations, the issuance of securities, the preparation of
filings arising out of or required by the various Federal and State securities,
business, public utilities and corporation laws, the selection of executive and
administrative personnel, the representation of System Companies before
regulatory bodies, proposals for capital expenditures, budgets, financing,
acquisition and disposition of properties, expansion of business, rate
structures, public relationships and other related matters.

          10.  Business and Operations Services.  Advise and assist System
               --------------------------------
Companies in all matters relating to operational capacity and the preparation
and coordination of operating studies. Manage System Companies' purchase, sale,
movement, transfer and accounting of volumes to ensure continued recovery of all
prudently incurred energy purchase costs through local jurisdictional cost
recovery mechanisms. Compile and communicate information relevant to system
operation. Perform general business and operations support services, including
business, plant and facilities operation, maintenance and management, travel,
aviation, fleet and mail services.

          11.  Exploration and Development.  Advise and assist System Companies
               ---------------------------
in all geological and exploration matters including the acquisition and
surrender of acreage and the development of underground storage facilities.

          12.  Risk Management.  Advise and assist System Companies in securing
               ---------------
requisite insurance, in the purchase and administration of all property,
casualty and marine insurance, in the settlement of insured claims and in
providing risk prevention advice.

                                       2
<PAGE>

          13.  Marketing.  Plan, formulate and implement marketing programs, as
               ---------
well as provide associated marketing services to assist System Companies with
improving customer satisfaction, load retention and shaping, growth of energy
sales and deliveries, energy conservation and efficiency. Assist System
Companies in carrying out policies and programs for the development of plant
locations and of industrial, commercial and wholesale markets and assist with
community redevelopment and rehabilitation programs.

          14.  Medical.  Direct and administer all medical and health activities
               -------
of System Companies. Provide systems of physical examination for employment and
other purposes and direct and administer programs for the prevention of
sickness.

          15.  Corporate Planning.  Advise and assist System Companies in
               ------------------
studying and planning in connection with operations, budgets, economic
forecasts, capital expenditures and special projects.

          16.  Procurement.  Advise and assist System Companies in the
               -----------
procurement of real and personal property, materials, supplies and services,
conduct purchase negotiations, prepare procurement agreements and administer
programs of material control.

          17.  Rates.  Advise and assist System Companies in the analysis of
               -----
their rate structure in the formulation of rate policies and in the negotiation
of large contracts. Advise and assist System Companies in proceedings before
regulatory bodies involving the rates and operations of System Companies and of
other competitors where such rates and operations directly or indirectly affect
System Companies.

          18.  Research.  Investigate and conduct research into problems
               --------
relating to production, utilization, testing, manufacture, transmission, storage
and distribution of energy. Keep abreast of and evaluate for System Companies
all research developments and programs of significance affecting System
Companies and the energy industry, conduct research and development in promising
areas and advise and assist in the solution of technical problems arising out of
System Companies' operations.

          19.  Tax.  Advise and assist System Companies in the preparation of
               ---
Federal and other tax returns, and generally advise System Companies as to any
problems involving taxes including the provision of due diligence in connection
with acquisitions.

          20.  Corporate Secretary.  Provide all necessary functions required of
               -------------------
a publicly held corporation; coordinating information and activities among
shareholders, the transfer agent, and Board of Directors; providing direct
services to security holders; preparing and filing required annual and interim
reports to shareholders and the SEC; conducting the annual meeting of
shareholders and ensuring proper maintenance of corporate records.

          21.  Investor Relations.  Provide fair and accurate analysis of DRI
               ------------------
and its operating subsidiaries and its outlook within the financial community,
enhancing DRI's

                                       3
<PAGE>

position in the energy industry; balancing and diversifying shareholder
investment in DRI through a wide range of activities; providing feedback to DRI
and its operating subsidiaries regarding investor concerns, trading and
ownerships; holding periodic analysts meetings; and providing various operating
data as requested or required by investors.

          22.  Environmental Compliance.  Provide consulting, cleanup, and other
               ------------------------
activities as required by System Companies to ensure full compliance with
applicable environmental statutes and regulations.

          23.  Customer Services.  Provide services and systems dedicated to
               -----------------
customer service, including billing, remittance, credit, collections, customer
relations, call centers, energy conservation support and metering.

          24.  Energy Marketing.  Provide services and systems dedicated to
               ----------------
energy marketing, including marketing and trading of gas and electric power, and
energy price risk management and development of marketing and sales programs in
physical and financial markets.

          25.  Treasury/Finance.  Provide services related to managing all
               ----------------
administrative activities associated with financing, including management of
capital structure; cash, credit and risk management activities; investment and
commercial banking relationships; oversight of decommissioning trust funds and
general financing activities.

          26.  External Affairs.  Provide services in support of corporation
               ----------------
strategies for managing relationships with federal, state and local governments,
agencies and legislative bodies. Formulate and assist with public relations and
communications programs and administration of corporate contribution and
community affairs programs.

                                       4
<PAGE>

                                                                      EXHIBIT II

           SERVICES THE COMPANY AGREES TO RECEIVE FROM DRI SERVICES

SERVICE                                                     YES         NO

1.   Accounting                                              __         __
2.   Auditing                                                __         __
3.   Legal and Regulatory                                    __         __
4.   Information Technology, Electronic Transmission
     and Computer Services                                   __         __
5.   Software Pooling                                        __         __
6.   Employee Benefits/Pension Investment                    __         __
7.   Employee Relations                                      __         __
8.   Operations                                              __         __
9.   Executive and Administrative                            __         __
10.  Business and Operations Services                        __         __
11.  Exploration and Development                             __         __
12.  Risk Management                                         __         __
13.  Marketing                                               __         __
14.  Medical                                                 __         __
15.  Corporate Planning                                      __         __
16.  Procurement                                             __         __
17.  Rates                                                   __         __
18.  Research                                                __         __
19.  Tax                                                     __         __
20.  Corporate Secretary                                     __         __
21.  Investor Relations                                      __         __
22.  Environmental Compliance                                __         __
23.  Customer Services                                       __         __
24.  Energy Marketing                                        __         __
25.  Treasury/Finance                                        __         __
26.  External Affairs                                        __         __
<PAGE>

                                                                     EXHIBIT III

           SERVICES THE COMPANY AGREES TO RECEIVE FROM CNG SERVICES

SERVICE                                                     YES          NO

1.   Accounting                                              __          __
2.   Auditing                                                __          __
3.   Legal and Regulatory                                    __          __
4.   Information Technology, Electronic Transmission
     and Computer Services                                   __          __
5.   Software Pooling                                        __          __
6.   Employee Benefits/Pension Investment                    __          __
7.   Employee Relations                                      __          __
8.   Operations                                              __          __
9.   Executive and Administrative                            __          __
10.  Business and Operations Services                        __          __
11.  Exploration and Development                             __          __
12.  Risk Management                                         __          __
13.  Marketing                                               __          __
14.  Medical                                                 __          __
15.  Corporate Planning                                      __          __
16.  Procurement                                             __          __
17.  Rates                                                   __          __
18.  Research                                                __          __
19.  Tax                                                     __          __
20.  Corporate Secretary                                     __          __
21.  Investor Relations                                      __          __
22.  Environmental Compliance                                __          __
23.  Customer Services                                       __          __
24.  Energy Marketing                                        __          __
25.  Treasury/Finance                                        __          __
26.  Public Affairs                                          __          __
<PAGE>

                                                                      EXHIBIT IV

            METHODS OF ALLOCATION FOR CNG SERVICES AND DRI SERVICES

CNG Services and DRI Services shall allocate costs independently. Each Service
Company shall allocate costs among companies receiving service from it under
this and similar service contracts using the following methods:

I.   The costs of rendering service by the Service Company will include all
     costs of doing business including interest on debt but excluding a return
     for the use of equity capital for which no charge will be made to System
     Companies.

II.  A.   The Service Company will maintain a separate record of the expenses of
          each department. The expenses of each department will include:

          1.   those expenses that are directly attributable to such department,
               and

          2.   an appropriate portion of those office and housekeeping expenses
               that are not directly attributable to a department but which are
               necessary to the operation of such department.

     B.   Expenses of the department will include salaries and wages of
          employees, rent and utilities, materials and supplies, depreciation,
          and all other expenses attributable to the department. The expenses of
          a department will not include:

          1.   those incremental out-of-pocket expenses that are incurred for
               the direct benefit and convenience of an individual company or
               group of companies,

          2.   Service Company overhead expenses, including expenses of the
               corporate secretary's department that are attributable to
               maintaining the corporate existence of the Service Company, and
               all other incidental overhead expenses including those auditing
               fees, internal auditing department expenses and accounting
               department expenses attributable to the Service Company.

     C.   The Service Company will establish annual budgets for controlling the
          expenses of each department and for determining estimated costs to be
          included in interim monthly billing.

III. A.   Employees in each department will be divided into two groups:
<PAGE>

          1.   Group A will include those employees rendering service to System
               Companies, and

          2.   Group B will include those office and general service employees,
               such as secretaries, file clerks and administrative assistants,
                                                -----------------------------
               who generally assist employees in Group A or render other
               housekeeping services and who are not engaged directly in
               rendering service to each Company or a group of companies.

     B.   Expenses set forth in Section II. above will be separated to show:

          1.   salaries and wages of Group A employees, and

          2.   all other expenses of the department.

     C.   There will be attributed to each dollar of a Group A employee's salary
          or wage, that percentage of all other expenses of his department (as
          defined in B above), that his salary or wage is to the total Group A
          salaries and wages of that department.

     D.   Group A employees in each department will maintain a record of the
          time they are employed in rendering service to each company or group
          of companies. An hourly rate will be determined by dividing the total
          expense attributable to a Group A employee as determined under
          subsection C above by the productive hours reported by such employee.

IV.  The charge to the Company for a particular service will be determined by
     multiplying the hours reported by Group A employees in rendering such
     service to each Company by the hourly rates applicable to such employees.
     When such employees render service to a group of companies, the charge to
     each Company will be determined by multiplying the hours attributable to
     the Company under the allocation formulas set forth in Section IX of this
     Exhibit by the hourly rates applicable to such employees.

V.   To the extent appropriate and practical, the foregoing computations of
     hourly rates and charges may be determined for groups of employees within
     reasonable salary range limits.

VI.  Those expenses of the Service Company that are not included in the annual
     expense of a department under Section II. above will be charged to System
     Companies receiving service as follows:

     A.   Incremental out-of-pocket costs incurred for the direct benefit and
          convenience of a company or group of companies will be charged
          directly to such company or group of companies. Such costs incurred
          for a group of companies will be allocated on the basis of an
          appropriate formula.

                                       2
<PAGE>

       B.   Service Company overhead expenses referred to in Section II. above
            will be charged to the Company in the proportion that the charges
            made to the Company for costs, other than those set forth in this
            Section VI., are to the total of such charges to all companies
            receiving service.

VII.   Notwithstanding the foregoing basis of determining cost allocations for
       billing purposes, cost allocations for certain services involving machine
       operations and production units will be determined on an appropriate
       basis established by the Service Company relating to the direct use of
       machine equipment or production units .

VIII.  Monthly bills will be issued for the services rendered to the Company on
       an actual or estimated basis. Estimates will normally be predicated on
       service department budgets and estimated productive hours of employees
       for the year. At the end of each year, estimated figures will be revised
       to reflect actual experience during such year and adjustments will be
       made in amounts billed to give effect to such revision.

IX.    When Group A employees render services to a group of companies, the
       following formulas shall be used to allocate the time of such employees
       to the individual companies receiving such service:

       A.   The Service Department or Function formulas to be used when
employees render services to all companies participating in such service, for
the services indicated are set forth below.  When necessary during period
1999-2002, the allocation formulas described below will be calculated (in part
or in whole) using data based on services performed for System Companies by
Dominion Resources, Inc., prior to the merger of Dominion Resources, Inc. and
Consolidated Natural Gas Company.

<TABLE>
<CAPTION>

           Service Department
              or Function                                      Basis of Allocation
              ----------                                       -------------------
<S>                                              <C>
Employee Benefits/                               The number of employee and annuitant accounts as
Pension Investments                              of the preceding December 31st.

Human Resources                                  The number of employees as of the preceding
                                                 December 31st.

Corporate Planning:
  - Capital Budgets                              Total investment in plant recorded at preceding
                                                 December 31st.
  - Operating &
    Maintenance Budgets                          Total operating expenses, excluding purchased gas
                                                 expense, purchased power expense (including fuel
                                                 expenses), other purchased products and royalties,
                                                 for the preceding year ended December 31st.
</TABLE>

                                       3
<PAGE>

<TABLE>
<CAPTION>
           Service Department
              or Function                                      Basis of Allocation
              ----------                                       -------------------
<S>                                              <C>
Business and Operations                          Energy sale and deliveries for the preceding year
Services                                         ended December 31st.

Risk Management                                  Insurance premiums for the preceding year ended
                                                 December 31st.

Rates                                            Total regulated company operating expenses,
                                                 excluding purchased gas expense, purchased power
                                                 expense (including fuel expense), other purchased
                                                 products and royalties, for the preceding year
                                                 ended December 31st.

Research                                         Gross revenues from the sale of natural gas
                                                 (including intercompany sales) and electricity,
                                                 recorded during the preceding year ended December
                                                 31st.

Tax                                              The sum of the total income and total deductions
                                                 as reported for Federal Income Tax purposes on the
                                                 last return filed.

Corporate Secretary/                             The weighted average of the previous three years
Investor Relations                               of total Service Company billings for the prior
                                                 years ended December 31st.

Customer Services                                For metering, the number of gas or electric meters
                                                 for the preceding year ended December 31st;
                                                 otherwise the number of customers for the
                                                 preceding year ended December 31st.

System Services Group:

Information Technology:
  LDC/EDC  Computer Applications                 Number of residential and commercial customers at
                                                 the end of the preceding year ended December 31st.

   Other Computer Applications                   Number of users or usage of specific computer
                                                 systems at the end of the preceding year ended
                                                 December 31st.

</TABLE>

                                       4
<PAGE>

<TABLE>
<CAPTION>
           Service Department
              or Function                                 Basis of Allocation
              ----------                                  -------------------
<S>                                          <C>
   Network Computer Applications             Number of network devices at the end of the
                                             preceding year ended December 31st.

   Telecommunications Applications           Number of telecommunications units at the end of
                                             the preceding year ended December 31st.

Facility Services:
   Building Services                         Square footage of office space as of the preceding
                                             year ended December 31st.

Processing Services:
   Payroll                                   Number of employees on the previous December 31st
                                             or the number of payroll payments generated during
                                             the previous year ending December 31st.

   Cash Management &                         Number of customer payments processed during the
   Customer Payment Processing               preceding year ended December 31st.

   Accounts Payable Processing               Number of accounts payable documents processed
                                             during the preceding year ended December 31st.

   Fleet Administration                      Number of vehicles at December 31st.

Purchasing                                   Dollar value of contract purchases for the
                                             preceding year ended December 31st.
Regulated Business Support Group:

Engineering Services:
   General Services                          Gas pipeline and/or electric supply line footage
                                             as of the preceding year ended December 31st.

   Transmission and Storage Services         Total investment in storage and transmission plant
                                             as of the preceding year ended December 31st.

Gas Supply:                                  Gas volumes purchased for each affiliate for the
                                             preceding year ended December 31st.

Electricity Supply:                          Electricity load purchased for each affiliate for
                                             the preceding year ended December 31st.
</TABLE>

                                       5
<PAGE>

<TABLE>
<CAPTION>
           Service Department
              or Function                                      Basis of Allocation
              ----------                                       -------------------
<S>                                          <C>
Marketing
   Shared Projects                           Annual marketing plan budget for the current year
                                             of allocation.

   Other Indirect Costs                      Total marketing direct and shared project costs
                                             billed to each System Company for the preceding
                                             year ended December 31st.

Material Management                          Material inventory assets as of the preceding year
                                             ended December 31st.

System Accounting:

Financial Accounting and Reporting           Number of financial related transactions, records
                                             and reports generated, and account code
                                             combinations for the preceding year ended December
                                             31st.

Regulated Fixed Assets                       Regulated companies fixed assets added, retired or
                                             transferred during the preceding year ended
                                             December 31st.
</TABLE>

     B.   Company Group Formulas to be used in the absence of a service
          department or function formula or when service rendered by employees
          is for a different group of companies than those companies regularly
          participating in such service:

<TABLE>
<CAPTION>
          Company Group                                       Basis of Allocation
<S>                                           <C>
All companies (includes all                   Total operating expenses, excluding purchased gas
 System Companies except Service              expense, purchased power expense (including fuel
 Company)                                     expense), other purchased products and royalties,
                                              for the preceding year ended December 31st.

All retail companies                          Volume of gas and quantity of electricity sold at
                                              retail during the preceding year ended December
                                              31st (converted to dollar value).

All wholesale companies                       Gross revenues from sales for resale recorded
                                              during the preceding year ended December 31st.
</TABLE>

                                       6
<PAGE>

<TABLE>
<S>                                           <C>
All companies having                          Gross investment in transmission plant recorded at
   transmission lines                         preceding December 31st.

All production companies                      Production plant budget for the current year of
                                              allocation.

Appalachian production                        Gross investment in Appalachian production plant
   companies                                  recorded at preceding December 31st.

All storage companies                         Gross investment in storage plant, excluding
                                              non-current inventory, recorded at preceding
                                              December 31st.

All Companies/                                The weighted average of the previous three years
   Shareholder Activities                     of Service Company billings.

All unregulated companies                     Total unregulated companies' operating expenses,
                                              excluding purchased gas expense, purchased power
                                              expense (including fuel expense), other purchased
                                              products and royalties, for the preceding year
                                              ending December 31st.

All regulated companies                       Total regulated companies' operating expenses,
                                              excluding purchased gas expense, purchased power
                                              expense (including fuel expense), other purchased
                                              products and royalties, for the preceding year
                                              ended December 31st.
</TABLE>

     C.   If the use of a basis of allocation would result in an inequity
          because of a change in operations or organization, then the Service
          Company may adjust the basis to effect an equitable distribution.

                                       7<PAGE>

                                                                    Exhbit 10.20

                       VIRGINIA POWER SUPPORT AGREEMENT

     THIS AGREEMENT is entered into as of the 1st day of January, 2000, by and
between Virginia Electric and Power Company, a Virginia public service company
("Virginia Power") and Dominion Resources Services, Inc., a Virginia corporation
("DRI Services").

     WHEREAS, Virginia Power is an electric utility engaged in the sale of
electric service at retail within its service territories in Virginia and North
Carolina and at wholesale within those territories and elsewhere in the United
States;

     WHEREAS, DRI Services is a wholly owned subsidiary of Dominion Resources,
Inc. ("DRI") which was formed in anticipation of DRI becoming a registered
utility holding company under the Public Utility Holding Company Act of 1935
("PUHCA");

     WHEREAS, under PUHCA, DRI will be prohibited from providing services to its
subsidiaries and affiliates and, upon approval of the form Service Agreement
under which DRI Services and Consolidated Natural Gas Service Company, Inc. will
provide services to their affiliates, sought contemporaneously herewith, all of
the services currently offered by DRI to its subsidiaries will be offered
through DRI Services (including those services currently offered by DRI to
Virginia Power under the Cost Allocation and Service Agreement approved by the
Virginia State Corporation Commission in Case No. PUE830060 (the "CASA"));

     WHEREAS, under the CASA and certain other existing agreements which have
been approved by the Virginia State Corporation Commission (the "Commission"),
Virginia Power currently provides services to DRI and/or DRI's subsidiaries (the
"Pre-Approved Services");

     WHEREAS, as a result of DRI becoming a registered holding company, it will
no longer be desirable or efficient for Virginia Power to continue to provide
the Pre-Approved Services directly to DRI;

     WHEREAS, Virginia Power now desires to provide certain services to DRI
Services, and DRI Services wishes to receive such services from Virginia Power,
in an effort to promote efficiencies and effectively utilize Virginia Power
resources and expertise; and

     WHEREAS, DRI Services is an "affiliated interest" of Virginia Power within
the meaning of the Utility Affiliates Act, Chapter 4 of Title 56 of the Code of
Virginia, and therefore contracts and arrangements for the furnishing of
services by Virginia Power to DRI Services are subject to approval of the
Commission;

     NOW, THEREFORE, in consideration of the mutual covenants contained herein
and other valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties agree as follows:
<PAGE>

     1.   General Services to be Provided by Virginia Power. Exhibit A hereto
          -------------------------------------------------
lists and describes all of the services that may be provided by Virginia Power
to DRI Services for the benefit of DRI Services and/or the existing or future
subsidiaries or affiliates of DRI. Such services are and will be provided to DRI
Services only on the mutual agreement of Virginia Power and DRI Services and in
accordance with the terms and conditions set forth herein.

     2.   Compensation and Allocation. Virginia Power and DRI Services recognize
          ---------------------------
the importance of DRI Services paying the appropriate compensation for the
services provided hereunder, so that there is no subsidization of either party
by the other. To that end, Virginia Power will maintain accurate records of its
operations that will enable it to determine the costs of the services that it
provides to DRI Services, and those books and records will be open to
examination by any state or federal commission having jurisdiction over
arrangements and services to be furnished, and the staffs of those commissions.
DRI Services will compensate Virginia Power for the services provided hereunder
by payment of the costs incurred to provide those services. Exhibit B hereto
contains rules for determining and allocating costs for services provided to DRI
Services by Virginia Power.

     3.   Governing Law.  This Agreement shall be governed by and construed in
          -------------
accordance with the laws of the Commonwealth of Virginia, without regard to
their conflicts of law provisions.

     4.   Entire Agreement.  This Agreement, together with its exhibits,
          ----------------
constitutes the entire understanding and agreement of the parties with respect
to its subject matter, and effective upon the execution of this Agreement by the
respective parties hereof, any and all prior agreements, understanding, or
representations with respect to this subject matter are hereby terminated and
cancelled in their entirety.

     5.   Waiver.  No waiver by any party hereto of a breach of any provision of
          ------
this Agreement shall constitute a waiver of any preceding or succeeding breach
of the same or any other provision hereof.

     6.   Non - Exclusive Rights and Obligations.   Nothing herein shall be
          --------------------------------------
construed to require DRI Services to obtain any of the services enumerated
herein from Virginia Power, nor to require Virginia Power to provide any of such
services to DRI Services.

     7.   Effective Date and Term.  This Agreement shall become effective when
          -----------------------
it has been approved by the Commission and executed by the parties, and it shall
continue in effect until terminated by either Virginia Power or DRI Services
giving the other sixty (60) days advance written notice of termination.

          This Agreement is subject to termination or modification at any time
to the extent its performance may conflict with the provisions of PUHCA, as
amended or with any rule,

                                       2
<PAGE>

regulation or order of the Securities and Exchange Commission adopted before or
after the making of this Agreement. This Agreement shall be subject to the
approval of any state commission or other state regulatory body whose approval
is, by the laws of such state, a legal prerequisite to the execution and
delivery or the performance of this Agreement.

     8.   VSCC Approval.  Pursuant to the Virginia State Corporation
          -------------
Commission's Order Approving Merger in Joint Petition of Dominion Resources,
Inc. and Consolidated Natural Gas Company, For approval of agreement and plan of
merger under Chapter 5 of Title 56 of the Code of Virginia, Case No. PUA990020,
issued on September 17, 1999, neither Virginia Power, Virginia Natural Gas, Inc.
nor any other DRI affiliate subject to regulation by the Commission shall have
any obligation under this Agreement except to the extent the Commission has
approved such obligation.

     9.   NCUC APPROVAL.  Pursuant to the North Carolina Utilities Commission's
          -------------
("NCUC") Order Approving Merger In the Matter of Application by Dominion
Resources, Inc., for Authorization under G.S. 62-111 to Engage in a Business
Combination Transaction, Docket No. E-22, Sub 380, issued on October 18, 1999,
Virginia Electric and Power Company, d/b/a North Carolina Power:

          (i)   may not make or incur a charge under this Agreement except in
                accordance with North Carolina law and the rules, regulations
                and orders of the NCUC promulgated thereunder; and

          (ii)  may not seek to reflect in rates any cost incurred or revenue
                level earned under an agreement subject to the 1935 Act to the
                extent disallowed by the NCUC.

     10.  Severability.  If any provision or provisions of this Agreement shall
          ------------
be held to be invalid, illegal or unenforceable, the validity, legality, and
enforceability of the remaining provisions shall in no way be affected or
impaired thereby.

          IN WITNESS WHEREOF, the parties have caused this Agreement to be duly
executed as of this 1st day of January, 2000.

Attest:                            By Virginia Electric and Power Company:

                                   ______________________________________
___________                        ______________________________________

Attest:                            By Dominion Resources Services, Inc.:

                                   ______________________________________
___________                        ______________________________________

                                       3
<PAGE>

                                   EXHIBIT A

DESCRIPTION OF APPROVED SERVICES TO BE OFFERED BY VIRGINIA ELECTRIC AND POWER
COMPANY TO DOMINION RESOURCES SERVICES, INC. UNDER THE AFFILIATE SERVICES
AGREEMENT

1.   Accounting.  Provide advice and assistance in accounting matters, including
     ----------
the development of accounting practices, procedures and controls, the
maintenance of the general ledger and related systems, the preparation and
analysis of financial statement reports, and the processing of certain accounts
payable, payroll, customer and cash management transactions.

2.   Auditing.  Periodically audit accounting records and other records and
     --------
coordinating audit examinations where applicable, with that of independent
public accountants. The audit staff will report on their examination and submit
recommendations, as appropriate, on improving methods of internal control and
accounting procedures.

3.   Legal and Regulatory.  Provide advice and assistance with respect to legal
     --------------------
and regulatory issues as well as regulatory compliance under Federal and State
laws.

4.   Information Technology, Electronic Transmission and Computer Services.
     ---------------------------------------------------------------------
Assist with the operation of an information technology function including the
development, implementation and operation of a centralized data processing
facility and the management of a telecommunications network.  This function
includes the central processing of computerized applications and support of
individual applications.  Provide computer resource/network availability,
including enterprise telecommunications infrastructure, mainframe and
distributed computing hardware, operating systems, business systems and
applications, internet, intranet and mail environments, software licenses and
maintenance agreements.

5.   Employee Benefits/Pension Investment.  Advise and assist in the
     ------------------------------------
administration of employee benefit and pension plans and prepare and maintain
records of employee and company accounts under the said plans, together with
such statistical data and reports as are pertinent to the plans.

6.   Employee Relations. Advise and assist in the formulation and administration
     ------------------
of employee relations policies and programs relating to labor relations,
personnel administration, training, wage and salary administration and safety.

7.   Operations.  Advise and assist in the study, planning, engineering and
     ----------
construction of energy plant facilities.  Assist in the development of long-
range operational programs.  Offer management, consulting and advisory/technical
services with respect to the physical operation of energy plant facilities and
the purchase, sale and transfer of affiliated companies.

                                       4
<PAGE>

8.   Executive and Administrative.  Advise and assist in the solution of major
     ----------------------------
problems and in the formulation and execution of general plans and policies.
Advise and assist as to operations, the issuance of securities, the preparation
of filings arising out of or required by the various Federal and State
securities, business, public utilities and corporation laws. The selection of
executive and administrative personnel, representation before regulatory bodies,
proposals for capital expenditures, budgets, financings, acquisition and
disposition of properties, expansion of business, rate structures, public
relationships and other related matters.

9.   Business and Operations Services. Advise and assist in all matters relating
     --------------------------------
to operational capacity and the preparation and coordination of operating
studies. Provide assistance with management of the purchase, sale, movement,
transfer and accounting of volumes to ensure continued recovery of all prudently
incurred energy purchase costs through local jurisdictional cost recovery
mechanisms. Compile and communicate information relevant to operations. Perform
general business and operations support services, including travel services,
fleet, mail, plant and facilities operation, maintenance and management.

10.  Exploration and Development.  Advise and assist in geological and
     ---------------------------
exploration matters including the acquisition and surrender of acreage and the
development of underground storage facilities.

11.  Risk Management.  Risk management services such as the securing of
     ---------------
requisite insurance, the purchase and administration of property, casualty and
marine insurance, the settlement of insured claims and the provision of risk
prevention advice.

12.  Marketing.  Assist in the planning, formulation and implementation of
     ---------
marketing programs, as well as provide associated marketing services to assist
with improving customer satisfaction, load retention and shaping, growth of
energy sales and deliveries, energy conservation and efficiency.  Assist in
carrying out policies and programs for the development of plant locations and of
industrial, commercial and wholesale markets and assist with community
redevelopment and rehabilitation programs.

13.  Budgeting and Planning.  Advise and assist in studying and planning in
     ----------------------
connection with operations, budgets, economic forecasts, rate structures,
capital expenditures and special projects.

14.  Purchasing.  Advise and assist in the purchase of materials, supplies and
     ----------
services and the preparation and negotiation of purchasing agreements.

15.  Rates.  Advise and assist in the analysis of rate structures, the
     -----
formulation of rate policies and the negotiation of large contracts.  Provide
consulting in connection with proceedings before regulatory bodies involving
rates and operations.

16.  Research.  Investigate and conduct research into problems relating to
     --------
production utilization, testing, manufacture, transmission, storage and
distribution of energy.  Evaluate and

                                       5
<PAGE>

conduct research and development in promising areas and advise and assist in the
solution of technical problems arising out of operations.

17.  Tax.  Advise and assist in the preparation of separate and consolidated tax
     ---
returns (Federal and State), interpretations of tax laws, administration of tax
audits, payment of taxes and related matters.

18.  Environmental Compliance.  Provide consulting and related services to
     ------------------------
ensure full compliance with applicable environmental statutes and regulations.

19.  Customer Service.  Provision of services and systems dedicated to customer
     ----------------
service, including billing, remittance, credit, collections, customer relations,
call centers, energy conservation support and metering.

20.  Energy Marketing.  Provide services and systems dedicated to energy
     ----------------
marketing, including marketing and trading of gas and electric power, energy
price risk management, and development of marketing and sales programs in
physical and financial markets.

21.  Treasury/Finance.  Provide services related to managing all administrative
     ----------------
activities associated with financing, including management of capital structure;
cash, credit and risk management activities; investment and commercial banking
relationships; oversight of decommissioning trust funds and general financing
activities.

22.  Office Space and Equipment.  Leasing of land, buildings, furnishings
     --------------------------
and equipment, including computer hardware and software and transportation
equipment.

23.  External Affairs.  Provide services in support of corporate strategies for
     ----------------
managing relationships with federal, state and local governments, agencies and
legislative bodies.  Formulate and assist with public relations and
communications programs and administration of corporate contribution and
community affairs programs.

                                       6
<PAGE>

                                   EXHIBIT B

                   METHODS OF ALLOCATION FOR VIRGINIA POWER

Virginia Power shall allocate costs independently to DRI Services using the
following methods:

I.   The costs of rendering service by Virginia Power will include all costs of
     doing business including interest on debt but excluding a return for the
     use of equity capital for which no charge will be made to DRI Services.

II.       A.   Virginia Power will maintain a separate record of the expenses of
               each department.  The expenses of each department will include:

               1.   those expenses that are directly attributable to such
                    department, and

               2.   an appropriate portion of those office and housekeeping
                    expenses that are not directly attributable to a department
                    but which are necessary to the operation of such department.

          B.   Expenses of the department will include salaries and wages of
               employees, rent and utilities, materials and supplies,
               depreciation, and all other expenses attributable to the
               department.  The expenses of a department will not include:

               1.   those incremental out-of-pocket expenses that are incurred
                    for the direct benefit and convenience of an individual
                    company or group of companies,

               2.   Virginia Power overhead expenses, including expenses of the
                    corporate secretary's department that are attributable to
                    maintaining the corporate existence of Virginia Power, and
                    all other incidental overhead expenses including those
                    auditing fees, internal auditing department expenses and
                    accounting department expenses attributable to Virginia
                    Power.

          C.   Virginia Power will establish annual budgets for controlling the
               expenses of each department and for determining estimated costs
               to be included in interim monthly billing.

III.      A.   Employees in each department will be divided into two groups:

               1.   Group A will include those employees who may render service
                    to DRI Services, and

                                       7
<PAGE>

               2.   Group B will include those office and general service
                    employees, such as secretaries, file clerks and
                    administrative assistants, who generally assist employees in
                    Group A or render other housekeeping services and who are
                    not engaged directly in rendering service to DRI Services.

     B.   Expenses set forth in Section II. above will be separated to show:

               1.   salaries and wages of Group A employees, and

               2.   all other expenses of the department.

     C.   There will be attributed to each dollar of a Group A employee's salary
          or wage, that percentage of all other expenses of his department (as
          defined in B above), that his salary or wage is to the total Group A
          salaries and wages of that department.

     D.   Group A employees in each department will maintain a record of the
          time they are employed in rendering service to DRI Services. An hourly
          rate will be determined by dividing the total expense attributable to
          a Group A employee as determined under subsection C above by the
          productive hours reported by such employee.

IV.  The charge to DRI Services for a particular service will be determined by
     multiplying the hours reported by Group A employees in rendering such
     service to DRI Services by the hourly rates applicable to such employees.

V.   To the extent appropriate and practical, the foregoing computations of
     hourly rates and charges may be determined for groups of employees within
     reasonable salary range limits.

VI.  Those expenses of Virginia Power that are not included in the annual
     expense of a department under Section II. above will be charged to DRI
     Services as follows:

     A.   Incremental out-of-pocket costs incurred for the direct benefit and
          convenience of DRI Services will be charged directly to such company.

     B.   Virginia Power overhead expenses referred to in Section II. above will
          be charged to DRI Services in the proportion that the charges made to
          DRI Services for costs, other than those set forth in this Section VI,
          are to the total of all department costs as defined in Section II.

VII. Notwithstanding the foregoing basis of determining cost allocations for
     billing purposes, cost allocations for certain services involving machine
     operations and

                                       8
<PAGE>

      production units will be determined on an appropriate basis established by
      Virginia Power relating to the direct use of machine equipment or
      production units.

VIII. Monthly bills will be issued for the services rendered to DRI Services on
      an actual or estimated basis. Estimates will normally be predicated on
      service department budgets and estimated productive hours of employees for
      the year. At the end of each year, estimated figures will be revised to
      reflect actual experience during such year and adjustments will be made in
      amounts billed to give effect to such revision.

IX.   If the use of a basis of allocation would result in an inequity because of
      a change in operations or organization, then Virginia Power may adjust the
      basis to effect an equitable distribution.

                                       9

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