<PAGE>


         THIS INSTRUMENT GRANTS A SECURITY INTEREST BY A PUBLIC UTILITY
           THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS

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                       OLD DOMINION ELECTRIC COOPERATIVE,

                                    GRANTOR,

                                       TO

                                  SUNTRUST BANK

                     (Successor by Merger to Crestar Bank),

                                     TRUSTEE

                            ------------------------


                        SIXTEENTH SUPPLEMENTAL INDENTURE
                            Dated as of July 1, 2003

                             ----------------------


           Supplemental to the Indenture of Mortgage and Deed of Trust
                             Dated as of May 1, 1992

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                  A Mortgage of Both Real and Personal Property


<PAGE>

                        SIXTEENTH SUPPLEMENTAL INDENTURE

       THIS SIXTEENTH SUPPLEMENTAL INDENTURE, dated as of July 1, 2003 (the
"Sixteenth Supplemental Indenture"), between Old Dominion Electric Cooperative,
a Virginia utility aggregation cooperative (the "Company"), whose mailing
address and address of its chief executive office is Innsbrook Corporate Center,
4201 Dominion Boulevard, Glen Allen, Virginia 23060, and SunTrust Bank, a
Georgia banking corporation and successor by merger to Crestar Bank, as trustee
(the "Trustee"), having a corporate trust office at 919 East Main Street, 10th
Floor, Corporate Trust Administration, Richmond, Virginia 23219.

       WHEREAS, the Company has heretofore executed and delivered an Indenture
of Mortgage and Deed of Trust, dated as of May 1, 1992 (the "Original
Indenture"), to secure, as provided therein, Bonds, to be issued in one or more
series as provided in the Original Indenture, as supplemented, modified or
amended (the Original Indenture as so supplemented, modified or amended and in
effect from time to time, the "Indenture"); and

       WHEREAS, the Original Indenture was recorded among the land records in
the counties of Albemarle, Fauquier, Halifax, Louisa, Spotsylvania and Orange,
Virginia, and a UCC Form 1 concerning the Original Indenture was recorded among
the financing statement records at the Virginia State Corporation Commission and
the Counties of Henrico, Halifax, Louisa, Spotsylvania and Orange, Virginia; and

       WHEREAS, each previous supplemental indenture to the Original Indenture
heretofore was recorded among the land records for the counties of Albemarle,
Fauquier, Halifax, Louisa, Spotsylvania and Orange, Virginia and among the
financing statement records at the Virginia State Corporation Commission and the
Counties of Albemarle, Fauquier, Henrico, Halifax, Louisa, Spotsylvania and
Orange, Virginia (other than the Thirteenth Supplemental Indenture, the
Fourteenth Supplemental Indenture and the Fifteenth Supplemental Indenture,
which were not recorded among the financing statement records of the County of
Henrico), which are all of the recording offices (excluding the County of
Henrico) in which this Sixteenth Supplemental Indenture will be recorded; and

       WHEREAS, the Board of Directors of the Company has established the 2003
Series A Bonds and the Board of Directors of the Company has authorized the
issuance thereof, and the Company has complied or will comply with all
provisions required to issue Additional Bonds provided for in the Indenture; and

       WHEREAS, the Company desires to execute and deliver this Sixteenth
Supplemental Indenture, in accordance with the provisions of the Indenture, for
the purposes of (i) providing for the creation of a new series of Bonds,
designating the series to be created and specifying the form and provisions of
the Bonds of such new series; and

       WHEREAS, Section 13.01 of the Indenture provides that, without the
consent of the Holders of any of the Bonds at any time Outstanding, the Company,
when authorized by a Board Resolution, and the Trustee may enter into a
Supplemental Indenture for the purpose and subject to the conditions set forth
in said Section 13.01; and


<PAGE>

       WHEREAS, all acts and proceedings required by law and by the Amended and
Restated Articles of Incorporation and Bylaws, as amended and restated, of the
Company necessary to secure the payment of the principal and Redemption Price of
and interest on the 2003 Series A Bonds, to make the 2003 Series A Bonds to be
issued hereunder, when executed by the Company, authenticated and delivered by
the Trustee and duly issued, the valid, binding and legal obligations of the
Company, and to constitute the Indenture a valid and binding mortgage for the
security of all of the Bonds prior to the Release Date, in accordance with its
and their terms, have been done and taken; and the execution and delivery of
this Sixteenth Supplemental Indenture has been in all respects duly authorized;

       NOW, THEREFORE, THIS SIXTEENTH SUPPLEMENTAL INDENTURE WITNESSETH, that,
to secure the payment of the principal of (and premium, if any) and interest on
the Outstanding Secured Bonds until the Release Date, to confirm the lien of the
Indenture upon the Trust Estate mentioned therein including all property
purchased, constructed or otherwise acquired by the Company since the date of
execution of the Original Indenture until the Release Date, to secure
performance of the covenants therein and herein contained, to declare the terms
and conditions on which the Outstanding Secured Bonds are secured, and in
consideration of the premises thereof and hereof, the Company by these presents
does grant, bargain, sell, alienate, remise, release, convey, assign, transfer,
mortgage, hypothecate, pledge, set over and confirm to the Trustee, in trust,
all property, rights, privileges and franchises (other than Excepted Property)
of the Company of the character described in the Granting Clauses of the
Indenture, including all such property, rights, privileges and franchises
acquired since the date of execution of the Original Indenture, including,
without limitation, all of those fee and leasehold interests in real property,
if any, which may hereafter be constructed or acquired by it, if any, but
subject to all exceptions, reservations and matters of the character therein
referred to, and expressly excepting and excluding from the lien and operation
of the Indenture all properties of the character specifically excepted by
paragraphs (A) through (K) of "Excepted Property" in the Indenture to the extent
contemplated thereby, and all property heretofore released or otherwise disposed
of pursuant to the provisions of the Indenture.

       PROVIDED, HOWEVER, that (i) if, upon the occurrence of an Event of
Default, the Trustee, or any separate trustee or co-trustee appointed under
Section 10.14 of the Indenture or any receiver appointed pursuant to statutory
provision or order of court, shall have entered into possession of all or
substantially all of the Trust Estate, all the Excepted Property described or
referred to in paragraphs (A) through (G), inclusive, of "Excepted Property" in
the Indenture then owned or thereafter acquired by the Company shall
immediately, and, in the case of any Excepted Property described or referred to
in paragraphs (H) through (J) inclusive, of "Excepted Property" in the
Indenture, upon demand of the Trustee or such other trustee or receiver, become
subject to the lien of the Indenture to the extent permitted by law, and the
Trustee or such other trustee or receiver may, to the extent permitted by law,
at the same time likewise take possession thereof, and (ii) whenever all Events
of Default shall have been cured and the possession of all or substantially all
of the Trust Estate shall have been restored to the Company, such Excepted
Property shall again be excepted and excluded from the lien of the Indenture to
the extent and otherwise as hereinabove set forth and as set forth in the
Indenture.

       The Company may, however, pursuant to Granting Clause Third of the
Indenture, subject any Excepted Property to the lien of the Indenture, whereupon
the same shall cease to be Excepted Property.

                                        2

<PAGE>

         TO HAVE AND TO HOLD all said property, rights, privileges and
franchises of every kind and description, real, personal or mixed, hereby and
hereafter (by Supplemental Indenture or otherwise) granted, bargained, sold,
alienated, remised, released, conveyed, assigned, transferred, mortgaged,
hypothecated, pledged, set over or confirmed as aforesaid, or intended, agreed
or covenanted so to be, together with all the appurtenances thereto appertaining
unto the Trustee and its successors and assigns forever.

         SUBJECT, HOWEVER, to (i) Permitted Encumbrances, (ii) to the extent
permitted by Section 14.06 of the Indenture, as to property acquired since the
date of execution of the Original Indenture, (a) any duly recorded or perfected
prior mortgage or other lien that may exist thereon at the date of the
acquisition thereof by the Company, and (b) purchase money mortgages created by
the Company at the time of acquisition thereof, and (iii) defects of title to
and encumbrances on property described in Article IV of the First Supplemental
Indenture.

         BUT IN TRUST, NEVERTHELESS, with power of sale, for the equal and
proportionate benefit and security of the Holders from time to time of all the
Outstanding Secured Bonds without any priority of any such Bond over any other
such Bond and for the enforcement of the payment of such Bonds in accordance
with their terms.

         UPON CONDITION that, until the happening of an Event of Default and
subject to the provisions of Article Six of the Indenture, the Company shall be
permitted to possess and use the Trust Estate, except cash, securities and other
personal property deposited, or required to be deposited, with the Trustee and
to explore for, mine, extract and dispose of coal, ore, gas, oil and other
minerals, to harvest standing timber and to receive and use the rents, issues,
profits, revenues and other income, products and proceeds of the Trust Estate.

         AND IT IS HEREBY COVENANTED AND DECLARED that all the Bonds are to be
authenticated and delivered and the Trust Estate is to be held and applied by
the Trustee, subject to the further covenants, conditions and trusts set forth
in the Indenture, and the Company does hereby covenant and agree to and with the
Trustee, for the equal and proportionate benefit of all Holders of the Bonds as
follows:

                                    ARTICLE I

                   TERMS AND ISSUE OF THE 2003 SERIES A BONDS

Section 1.01. General. There is hereby established under the Indenture, as
further amended by this Sixteenth Supplemental Indenture, a series of Bonds,
known as and entitled "2003 Series A Bonds" (collectively, the "2003 Series A
Bonds"). The aggregate principal amount of 2003 Series A Bonds which may be
authenticated and delivered and Outstanding is limited to TWO HUNDRED FIFTY
MILLION AND NO/00 DOLLARS ($250,000,000.00). The 2003 Series A Bonds will mature
on December 1, 2028. The Trustee is hereby appointed as Authenticating Agent for
the 2003 Series A Bonds.

         The 2003 Series A Bonds shall be issuable without coupons and in
denominations of $1,000 and integral multiples thereof. The 2003 Series A Bonds
shall bear interest from their date of issuance, payable semi-annually on June 1
and December 1 of each year, commencing on

                                        3

<PAGE>

December 1, 2003, at the rate of 5.676%. Interest on the 2003 Series A Bonds
shall be computed on the basis of a 360-day year of twelve 30-day months for the
actual number of days lapsed.

         The principal and the Redemption Price of and interest on the 2003
Series A Bonds shall be payable to the registered owner of the 2003 Series A
Bonds or its assignee in accordance with the provisions of the Indenture on the
applicable Interest Payment Date or Redemption Date. Interest on the 2003 Series
A Bonds shall be payable without presentation of the 2003 Series A Bonds for
payment. Payment of the principal and Redemption Price of and interest on any
2003 Series A Bond shall be payable at the office of the Trustee in Richmond,
Virginia. Such location is the Place of Payment.

         The Regular Record Date (referred to in Section 3.09 of the Indenture)
for the payment of interest on the 2003 Series A Bonds shall be the fifteenth
day (whether or not a business day) of the calendar month next preceding such
Interest Payment Date.

         Section 1.02. Sinking Fund Redemption.

         (a) The 2003 Series A Bonds are subject to redemption on December 1 on
each year, commencing with the year 2005 and ending with the year 2027, through
operation of the sinking fund for the 2003 Series A Bonds, at a Redemption Price
equal to 100% of the principal amount being redeemed, plus accrued interest
through the Redemption Date (subject to the right of holders of record on the
relevant record date to receive interest due on an interest payment date that is
on or prior to the Redemption Date). As a sinking fund for the 2003 Series A
Bonds, the Company shall redeem on December 1 in each year beginning with the
year 2005 and ending with the year 2027 the aggregate principal amount of the
2003 Series A Bonds specified in the following table:

                                        4

<PAGE>

                                                        Aggregate Principal
            Year                                      Amount of 2003 Series A
            ----                                               Bonds
                                                               -----

            December 1, 2005 .....................           $10,417,000
            December 1, 2006 .....................           $10,417,000
            December 1, 2007 .....................           $10,417,000
            December 1, 2008 .....................           $10,417,000
            December 1, 2009 .....................           $10,417,000
            December 1, 2010 .....................           $10,417,000
            December 1, 2011 .....................           $10,417,000
            December 1, 2012 .....................           $10,417,000
            December 1, 2013 .....................           $10,417,000
            December 1, 2014 .....................           $10,417,000
            December 1, 2015 .....................           $10,417,000
            December 1, 2016 .....................           $10,417,000
            December 1, 2017 .....................           $10,417,000
            December 1, 2018 .....................           $10,417,000
            December 1, 2019 .....................           $10,417,000
            December 1, 2020 .....................           $10,417,000
            December 1, 2021 .....................           $10,416,000
            December 1, 2022 .....................           $10,416,000
            December 1, 2023 .....................           $10,416,000
            December 1, 2024 .....................           $10,416,000
            December 1, 2025 .....................           $10,416,000
            December 1, 2026 .....................           $10,416,000
            December 1, 2027 .....................           $10,416,000


         The principal amount of the 2003 Series A Bonds acquired and
surrendered for cancellation or redeemed by the Company (otherwise than through
operation of the sinking fund) shall be credited against sinking fund payments
for the 2003 Series A Bonds (including, for purposes of this paragraph, as a
sinking fund payment, $10,416,000 principal amount of 2003 Series A Bonds not to
be redeemed through operation of the sinking fund but to be repaid at maturity
on December 1, 2028) in proportion to the respective amounts of such required
sinking fund payments.

         (b) The particular 2003 Series A Bonds to be redeemed through sinking
fund payments, as provided in this Section 1.02, shall be selected by the
Trustee from the Outstanding 2003 Series A Bonds which have not been previously
been called for redemption by prorating, as nearly as may be subject to
adjustment as provided in Section 15.03 of the Indenture, the principal amount
of the 2003 Series A Bonds to be redeemed among the Holders thereof in
proportion to the aggregate principal amount thereof registered in their
respective names; EXCEPT that, if there shall have been previously filed with
the Trustee an Act of all of the Holders thereof satisfactory to the Trustee
specifying the method of selecting the 2003 Series A Bonds to be redeemed, such
selection shall be made by the Trustee in accordance with the terms of such Act.

         (c) The Trustee shall cause notice of each redemption pursuant to this
Section to be given to each Holder of the 2003 Series A Bonds then Outstanding
at its address as the same shall last appear upon the Bond Register, by first
class mail at least 30 and no more than 60 days prior to the Redemption Date;
provided that so long as the Book-Entry System is maintained in effect, notice
of redemption shall be given to the registered Holders at the time and in the
manner required in the DTC Letter of Representations executed in connection with
the issuance and sale of the 2003 Series

                                        5

<PAGE>

A Bonds (as amended and in effect from time to time, the "2003 Series A DTC
Letter of Representations"), and the Trustee shall not be required to give any
other notice of redemption otherwise required herein. The notice of redemption
shall specify the Redemption Date, the place or places of payments, that payment
will be made only upon the presentation and surrender of the 2003 Series A Bonds
to be redeemed, that interest, if any, accrued to the Redemption Date will be
paid as specified in such notice and that on and after such date interest
thereon shall cease to accrue.

       Section 1.03. Make-Whole Redemption.

       (a) The 2003 Series A Bonds are subject to redemption, as a whole or in
part, on any date (whether or not an Interest Payment Date) at the election of
the Company at a Redemption Price equal to the greater of (i) 100% of the
principal amount of the 2003 Series A Bonds being redeemed plus all accrued, but
not yet due and payable, interest to the Redemption Date; and (ii) the sum of
the present values of all principal and interest payments scheduled to become
due after the date of such redemption in respect of the 2003 Series A Bonds
being redeemed discounted on a semi-annual basis (assuming a 360-day year
consisting of twelve 30-day months) and calculated using a discount rate equal
to the sum of (A) the yield to maturity of the U.S. Treasury security having a
life equal to the remaining average life of the 2003 Series A Bonds to be
redeemed and trading in the secondary market at the price closest to par, and
(B) twenty (20) basis points; provided, however, that if there is no U.S.
Treasury security having a life equal to the remaining average life of the 2003
Series A Bonds to be redeemed, such discount rate shall be calculated using a
yield to maturity interpolated or extrapolated on a straight-line basis
(rounding to the nearest calendar month, if necessary) from the yields to
maturity of two (2) U.S. Treasury securities having lives most closely
corresponding to the remaining average life of the 2003 Series A Bonds to be
redeemed and trading in the secondary market at the prices closest to par. In
addition, any interest due and payable but unpaid on 2003 Series A Bonds being
redeemed shall be paid on the Redemption Date therefor.

       (b) The calculations set forth in paragraph (a) above of this Section
1.03 shall be determined on the third business day prior to the scheduled
Redemption Date by an investment banking institution of national standing in the
United States selected by the Company or, if the Trustee does not receive notice
of such selection at least ten days prior to a scheduled Redemption Date or if
an Event of Default under the Indenture shall have occurred and be continuing,
selected by the Trustee.

       (c) If less than all the 2003 Series A Bonds are to be redeemed pursuant
to this Section 1.03, the particular 2003 Series A Bonds to be redeemed shall be
selected not more than sixty (60) days prior to the Redemption Date by the
Trustee from the Outstanding Obligations of such series or maturity within a
series which have not previously been called for redemption by such method as
the Trustee shall deem fair and appropriate. In any such selection pursuant to
this Section, the Trustee shall make such adjustments, reallocations and
eliminations as it shall deem proper to the end that the principal amount the
2003 Series A Bonds so selected shall be equal to $1,000, or an integral
multiple thereof. The Trustee in its discretion may determine the particular
2003 Series A Bonds (if there is more than one) registered in the name of any
Holder which are to be redeemed, in whole or in part. In any case where any of
the 2003 Series A Bonds are registered in the same name, the Trustee in its
discretion may treat the aggregate principal amount so registered as if it were
represented by one 2003 Series A Bond.

                                        6

<PAGE>

       The Trustee shall promptly notify the Company in writing of the 2003
Series A Bonds selected for redemption and, in the case of any 2003 Series A
Bonds selected for partial redemption, the principal amount thereof to be
redeemed.

       (d) Upon receipt of a notice from the Company of its intent to effect an
optional redemption of the 2003 Series A Bonds, the Trustee shall cause notice
of such redemption to be given to each Holder of the 2003 Series A Bonds then
Outstanding at its address as the same shall last appear upon the Bond Register,
by first class mail at least 30 and no more than 60 days prior to the Redemption
Date; provided that so long as the Book-Entry System is maintained in effect,
notice of redemption shall be given to the registered Holders at the time and in
the manner required in the 2003 Series A DTC Letter of Representations, and the
Trustee shall not be required to give any other notice of redemption otherwise
required herein. The notice of redemption shall specify the Redemption Date, the
place or places of payments, that payment will be made only upon the
presentation and surrender of the 2003 Series A Bonds to be redeemed, that
interest, if any, accrued to the Redemption Date will be paid as specified in
such notice and that on and after such date interest thereon shall cease to
accrue.

       (e) Except as provided in Section 1.02 and Section 1.03, the 2003 Series
A Bonds are not redeemable at any time prior to their Stated Maturity.

       (f) Notwithstanding anything to the contrary contained herein or in the
Indenture, if, at the time the Company gives notice to the Trustee of a
redemption as provided for in this Section 1.03 the Trustee does not have on
deposit sufficient available funds designated for the purpose of paying the
principal of, premium, if any, and interest accrued and to accrue through the
applicable Redemption Date on the 2003 Series A Bonds so called for redemption,
then the Company's notice of redemption is conditional and revocable, that is,
the Company is under no obligation to provide, or cause to be provided, to the
Trustee funds to effect such redemption and, if the Company does not elect to do
so by 2:00 p.m., New York City time, on the Redemption Date, then the 2003
Series A Bonds called for redemption shall not be redeemed pursuant to this
notice of redemption or the notice of redemption given by the Trustee pursuant
to the Indenture. The Company will not be liable to any holder of the 2003
Series A Bonds if the Company does not provide, or cause to be provided, funds
sufficient to effect redemption of any such 2003 Series A Bonds with the result
that such 2003 Series A Bonds are not redeemed on the Redemption Date specified
in such notices. If, at the time the Company gives this notice, the Trustee has
on deposit sufficient funds designated for the purpose of and to effect such
redemption, then the Company's notice is unconditional and irrevocable and the
2003 Series A Bonds specified in the Company's notice and given by the Trustee
pursuant to the Indenture shall become due and payable at the specified
Redemption Price on the specified Redemption Date.

       Section 1.04. Exchangeability. When the 2003 Series A Bonds are held in a
Book-Entry System, the delivery of 2003 Series A Bonds, exchanges, transfers and
assignments of the 2003 Series A Bonds and issuance of the 2003 Series A Bonds
shall be determined by the provisions of the 2003 Series A DTC Letter of
Representations.

       Subject to Section 3.07 of the Indenture, all 2003 Series A Bonds not
held in the Book-Entry System shall be fully interchangeable, and, upon
surrender at the office or agency of the Trustee in a Place of Payment therefor,
shall be exchangeable for other 2003 Series A Bonds of the same maturity but of
a different authorized denomination or denominations, as requested by the Holder

                                        7

<PAGE>

surrendering the same. The Company will execute, and the Trustee shall
authenticate and deliver, 2003 Series A Bonds whenever the same are required for
any such exchange.

       Section 1.05. Book-Entry System, Certificates, Registration and Payment.
When the 2003 Series A Bonds are held in a Book-Entry System, 2003 Series A
Bonds shall (except to the extent otherwise required by the 2003 Series A DTC
Letter of Representations) be evidenced by one or more certificates, in an
amount equal to the aggregate principal amount of such maturity of 2003 Series A
Bonds.

       The principal and Redemption Price of and interest on the 2003 Series A
Bonds shall be payable in lawful money of the United States of America. While
the 2003 Series A Bonds are held in the Book-Entry System, payment of the
principal and Redemption Price of and interest on the 2003 Series A Bonds shall
be made by wire transfer of Federal Reserve funds or equivalent same-day funds,
or in such other manner as permitted by the 2003 Series A DTC Letter of
Representations (as the same may be amended from time to time), to the account
of Cede & Co. In the event the 2003 Series A Bonds are not held in the
Book-Entry System, (i) interest on the 2003 Series A Bonds shall be payable on
each Interest Payment Date by check payable to the Holder (except that if so
instructed in writing by a Holder of $1,000,000 or more of the 2003 Series A
Bonds on or prior to the applicable Regular Record Date, such payments shall be
made by the wire transfer of Federal funds on the Interest Payment Date), mailed
to the Holder at his or her address as it appears on the Bonds Register on the
last day of the calendar month prior to the Interest Payment Date, or in such
other manner as such Holder and the Trustee may determine, and (ii) principal
shall be payable only upon presentation and surrender of each 2003 Series A
Bond, as the same becomes due, at the office from which the Trustee performs the
payment function for 2003 Series A Bonds. Except as may be provided in the 2003
Series A DTC Letter of Representations with respect to 2003 Series A Bonds then
held in the Book-Entry System, payment of principal shall be made only upon
presentation and surrender of each 2003 Series A Bond, as the same becomes due,
at the office from which the Trustee performs the payment function for the 2003
Series A Bonds.

       The Trustee shall act as Bond Registrar and shall maintain registration
books for the registration and the registration of transfer of the 2003 Series A
Bonds.

       So long as the 2003 Series A Bonds are held in the Book-Entry System:

       (a) The registered Holder of all of the 2003 Series A Bonds shall be DTC,
and the 2003 Series A Bonds shall be registered in the name of Cede & Co., as
nominee for DTC, pursuant to the 2003 Series A DTC Letter of Representations,
and the provisions of such Letter of Representations shall be incorporated
herein by this reference;

       (b) The Trustee and the Company may treat DTC (or its nominee) as the
sole and exclusive registered Holder of the 2003 Series A Bonds registered in
its name for the purposes of payment of the principal and Redemption Price of or
interest on the 2003 Series A Bonds, selecting the 2003 Series A Bonds or
portions thereof to be redeemed, giving notice as required under the Indenture,
registering the transfer of 2003 Series A Bonds, obtaining any consent or other
action to be taken by the Holders and for all other purposes whatsoever; and
neither the Trustee nor the Company shall be affected by any notice to the
contrary;

                                        8

<PAGE>

       (c) Neither the Trustee nor the Company shall have any responsibility or
obligation to any person claiming a beneficial ownership interest in the 2003
Series A Bonds under or through DTC or any DTC Participant, or any other person
which is not shown on the Bond Register as being a registered Holder, with
respect to the accuracy of any records maintained by DTC or any DTC Participant;
the payment by DTC or any DTC Participant of any amount in respect of the
principal or Redemption Price of or interest on the 2003 Series A Bonds; any
notice or direction which is permitted or required to be given to or received
from Holders under the Indenture; the selection by DTC or any DTC Participant of
any Person to receive payment in the event of a partial redemption of the 2003
Series A Bonds; or any consent given or other action taken by DTC as Holder; nor
shall any DTC Participant or any such Person be deemed to be a third party
beneficiary of any Holders' rights under the Indenture;

       (d) The Trustee shall pay from moneys available hereunder all principal
and Redemption Price of and interest on the 2003 Series A Bonds only to or upon
the order of DTC or its designee, and all such payments shall be valid and
effective to fully satisfy and discharge the Company's obligations with respect
to the principal and Redemption Price of and interest on the 2003 Series A Bonds
to the extent of the sum or sums so paid;

       (e) No person other than DTC shall receive an authenticated 2003 Series A
Bond evidencing the obligation of the Company to make payments of principal and
Redemption Price of and interest pursuant to the Indenture; and (f) Upon
delivery by DTC to the Trustee of DTC's written notice to the effect that DTC
has determined to substitute a new nominee in place of Cede & Co., and subject
to the provisions of the Indenture with respect to transfers of 2003 Series A
Bonds, the term "Cede & Co." in this Sixteenth Supplemental Indenture shall
refer to such new nominee of DTC.

       Section 1.06. Availability of Bond Certificates. At any time it
determines that it is in the best interests of the Holders, the Company may
notify DTC and the Trustee, whereupon DTC will, if consistent with DTC's
then-current policies, notify the DTC Participants of the availability through
DTC of 2003 Series A Bond certificates. In such event, the Company shall prepare
and execute and the Trustee shall issue, transfer and exchange, at the expense
of the Company, 2003 Series A Bond certificates as requested in writing by DTC
in appropriate amounts. DTC may determine to discontinue providing its services
with respect to the 2003 Series A Bonds at any time by giving written notice to
the Company and the Trustee and discharging its responsibilities with respect
thereto under applicable law. If DTC resigns as securities depository for the
2003 Series A Bonds, the 2003 Series A Bond certificates shall be delivered
pursuant to this Section. Under such circumstances (if there is no successor
securities depository), the Company and the Trustee shall be obligated to
deliver 2003 Series A Bonds as described in the Indenture, provided that the
expense in connection therewith shall be paid by the Company. In the event that
certificates for 2003 Series A Bonds are issued, the provisions of the Indenture
shall apply to, among other things, the transfer and exchange of such
certificates and the method of payment of principal of and Redemption Price of
and interest on such 2003 Series A Bonds. Whenever DTC requests the Company to
do so, the Company will cooperate with DTC in taking appropriate action after
written notice (a) to make available one or more separate certificates
evidencing the 2003 Series A Bonds to any DTC Participant having 2003 Series A
Bonds credited to its DTC account, or (b) to arrange for another securities
depository to maintain custody of certificates evidencing the 2003 Series A
Bonds.

                                        9

<PAGE>

       Section 1.07. Form of 2003 Series A Bonds. The 2003 Series A Bonds and
the Trustee's authentication certificate to be executed on the Bonds of such
series shall be substantially in the form attached hereto as Exhibit A, with
such appropriate insertions, omissions, substitutions and other variations as
are required or permitted by the Indenture, and may have such letters, numbers
or other marks of identification and such legends or endorsements placed thereon
as may be required to comply with the rules of any securities exchange or as
may, consistently herewith, be determined by the Officers executing such Bonds,
as evidenced by their execution of such Bonds.

                                   ARTICLE II

                  PRINCIPAL AMOUNT PRESENTLY TO BE OUTSTANDING

       Section 2.01. Principal Amount Presently To Be Outstanding. The total
aggregate principal amount of Bonds of the Company issued and Outstanding and
presently to be issued and Outstanding under the provisions of and secured by
the Indenture will be ONE BILLION SEVEN MILLION FIVE HUNDRED EIGHTY-NINE
THOUSAND ONE HUNDRED FIVE AND 73/00 DOLLARS ($1,007,589,105.73).

                                   ARTICLE III

                                 MISCELLANEOUS

       Section 3.01. This Sixteenth Supplemental Indenture is executed and shall
be construed as an indenture supplemental and amendatory to the Original
Indenture, and shall form a part thereof, and the Indenture, as hereby
supplemented, amended and modified, is hereby confirmed. Except to the extent
inconsistent with the express terms hereof, all of the provisions, terms,
covenants and conditions of the Indenture shall be applicable to the 2003 Series
A Bonds to the same extent as if specifically set forth herein. All capitalized
terms used in this Sixteenth Supplemental Indenture shall be taken to have the
same meanings as in the Indenture, except in cases where the context clearly
indicates otherwise.

       Section 3.02. All recitals in this Sixteenth Supplemental Indenture are
made by the Company only and not by the Trustee; and all of the provisions
contained in the Indenture, in respect of the rights, privileges, immunities,
powers and duties of the Trustee shall be applicable in respect hereof as fully
and with like effect as if set forth herein in full.

       Section 3.03. Whenever in this Sixteenth Supplemental Indenture any of
the parties hereto is named or referred to, this shall, subject to the
provisions of Articles Ten and Twelve of the Indenture, be deemed to include the
successors and assigns of such party, and all the covenants and agreements in
this Sixteenth Supplemental Indenture contained by or on behalf of the Company,
or by or on behalf of the Trustee shall, subject as aforesaid, bind and inure to
the respective benefits of the respective successors and assigns of such
parties, whether so expressed or not.

       Section 3.04. Nothing in this Sixteenth Supplemental Indenture, expressed
or implied, is intended, or shall be construed, to confer upon, or to give to,
any person, firm or corporation, other than the parties hereto and the Holders
of the Outstanding Bonds, any right, remedy or claim under or by reason of this
Sixteenth Supplemental Indenture or any covenant, condition, stipulation,
promise or agreement hereof, and all the covenants, conditions, stipulations,
promises and

                                       10

<PAGE>

agreements in this Sixteenth Supplemental Indenture contained by or on behalf of
the Company shall be for the sole and exclusive benefit of the parties hereto,
and of the Holders of Outstanding Bonds.

       Section 3.05. This Sixteenth Supplemental Indenture may be executed in
several counterparts, each of such counterparts shall for all purposes be deemed
to be an original, and all such counterparts, or as many of them as the Company
and the Trustee shall preserve undestroyed, shall together constitute but one
and the same instrument.

       Section 3.06. Although this Sixteenth Supplemental Indenture is dated for
convenience and for the purpose of reference as of July 1, 2003, the actual date
or dates of execution by the Company and by the Trustee are as indicated by
their respective acknowledgments hereto annexed.

       Section 3.07. To the extent permitted by applicable law, this Sixteenth
Supplemental Indenture shall be deemed to be a Security Agreement and Financing
Statement whereby the Company grants to the Trustee, until the Release Date, a
security interest in all of the Trust Estate that is personal property or
fixtures under the Uniform Commercial Code, as adopted or hereafter adopted in
one or more of the states in which any part of the properties of the Company are
situated. The mailing address of the Company, as debtor, is Innsbrook Corporate
Center, 4201 Dominion Boulevard, Glen Allen, Virginia 23060, and the mailing
address of the Trustee, as secured party, is SunTrust Bank, Attention: Corporate
Trust Administration, 919 East Main Street, 10th Floor, Richmond, Virginia
23219.

                    [SIGNATURES APPEAR ON THE FOLLOWING PAGE]

                                       11

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Sixteenth
Supplemental Indenture to be duly executed as of the day and year first above
written.

Company:                                      OLD DOMINION ELECTRIC COOPERATIVE
Innsbrook Corporate Center
4201 Dominion Boulevard
Glen Allen, Virginia 23060

                                              By: /s/ Daniel M. Walker
                                                 -------------------------------
                                                 Name:  Daniel M. Walker
                                                 Title: Senior Vice President
                                                        Accounting and Finance

Trustee:                                      SUNTRUST BANK, as Trustee

919 East Main Street, 10th Floor
Corporate Trust Administration
Richmond, Virginia 23219

                                              By: /s/ Jackie Shornak
                                                 -------------------------------
                                                 Name:  Jackie Shornak
                                                 Title: Assistant Vice Presiden

<PAGE>

ACKNOWLEDGMENT

COMMONWEALTH OF VIRGINIA            )
                                    )
CITY/COUNTY OF HENRICO              )


         The foregoing instrument was acknowledged before me this 24th day of
July, 2003, by Daniel M. Walker, the Senior Vice President of Old Dominion
Electric Cooperative, a Virginia utility aggregation cooperative.

                                               /s/ Susan M. Friedman
                                               ________________________________
                                               Notary Public

My Commission expires:  January 31, 2007

                                 ACKNOWLEDGMENT

COMMONWEALTH OF VIRGINIA            )
                                    )
CITY/COUNTY OF RICHMOND             )


         The foregoing instrument was acknowledged before me this 24th day of
July, 2003, by Jackie Shornak, the Assistant Vice President of SunTrust Bank, a
Georgia banking corporation, on behalf of the Bank.

                                               /s/ Susan D. Clark
                                               ________________________________
                                               Notary Public

My Commission expires:  December 31, 2007

<PAGE>

                                    EXHIBIT A

                           FORM OF 2003 SERIES A BONDS

UNLESS THIS CERTIFICATE IS PRESENTED BY AN AUTHORIZED REPRESENTATIVE OF THE
DEPOSITORY TRUST COMPANY, A NEW YORK CORPORATION ("DTC"), TO ISSUER OR ITS AGENT
FOR REGISTRATION OF TRANSFER, EXCHANGE, OR PAYMENT, AND ANY CERTIFICATE ISSUED
IS REGISTERED IN THE NAME OF CEDE & CO. OR IN SUCH OTHER NAME AS IS REQUESTED BY
AN AUTHORIZED REPRESENTATIVE OF DTC (AND ANY PAYMENT IS MADE TO CEDE & CO. OR TO
SUCH OTHER ENTITY AS IS REQUESTED BY AN AUTHORIZED REPRESENTATIVE OF DTC), ANY
TRANSFER, PLEDGES OR OTHER USE HEREOF FOR VALUE OR OTHERWISE BY OR TO ANY PERSON
IS WRONGFUL INASMUCH AS THE REGISTERED OWNER HEREOF, CEDE & CO., HAS AN INTEREST
HEREIN.

                        Old Dominion Electric cooperative

                    2003 Series A Bonds Due December 1, 2028

No.  _____                                                    $________________

         Old Dominion Electric Cooperative, a Virginia utility aggregation
cooperative (herein called the "Company," which term includes any successor
corporation under the Indenture of Mortgage and Deed of Trust, dated as of May
1, 1992, as supplemented and amended) for value received, hereby promises to pay
to ____________, or registered assigns, the principal sum of _____________
Dollars on December 1, 2028, and to pay interest (computed on the basis of a
360-day year of twelve 30-day months) thereon from the date of issuance or from
the most recent Interest Payment Date to which interest has been paid or duly
provided for, semi-annually on June 1 and December 1 in each year, commencing on
December 1, 2003, at the rate of 5.676% per annum, until the principal hereof is
paid or made available for payment. The interest so payable, and punctually paid
or duly provided for, on any Interest Payment Date will, as provided in such
Indenture, be paid to the Person in whose name this Bond (or one or more
Predecessor Bonds) is registered at the close of business on the Regular Record
Date for such interest, which shall be the fifteenth day (whether or not a
business day), of the calendar month next preceding such Interest Payment Date.
Any such interest not so punctually paid or duly provided for will forthwith
cease to be payable to the Holder on such Regular Record Date and may either be
paid to the Person in whose name this Bond (or one or more Predecessor Bonds) is
registered at the close of business on a Special Record Date for the payment of
such defaulted interest to be fixed by the Trustee, notice whereof shall be
given to Holders of Bonds of this series not more than 15 and not less than 10
days prior to such Special Record Date, or may be paid at any time in any other
lawful manner not inconsistent with the requirements of any securities exchange
on which Bonds of this series may be listed, and upon such notice as may be
required by such exchange, all as more fully provided in said Indenture.

         Payment of the principal and Redemption Price of and any such interest
on this Bond will be made at the office or agency of the Trustee maintained for
that purpose in Richmond, Virginia, in

<PAGE>

such coin or currency of the United States of America as at the time of payment
is legal tender for payment of public and private debts; PROVIDED, HOWEVER, that
(subject to the terms on the reverse hereof) at the option of the Company
payment of interest may be made by check mailed to the address of the Person
entitled thereto as such address shall appear in the Bond Register.

         Reference is hereby made to the further provisions of this Bond set
forth on the reverse hereof, which further provisions shall for all purposes
have the same effect as if set forth at this place.

         Unless the certificate of authentication hereon has been executed by
the Trustee referred to on the reverse hereof by manual signature, this Bond
shall not be entitled to any benefit under the Indenture or be valid or
obligatory for any purpose.

         IN WITNESS WHEREOF, the Company has caused this Bond to be duly
executed.

Dated:  [Date of Authentication]

                                           OLD DOMINION ELECTRIC COOPERATIVE

                                           By: SPECIMEN
                                               ------------------------------
                                               Authorized Officer

ATTEST:

_________________________
Name:
Title:

                                [Reverse of Bond]

         This is one of the Bonds referred to in and secured by the Indenture of
Mortgage and Deed of Trust, dated as of May 1, 1992, by and between Old Dominion
Electric Cooperative and Crestar Bank, as trustee, as the same has been and may
be supplemented, modified or amended and effective from time to time prior to
the Release Date (the "Original Indenture"), under which the undersigned now
acts as Trustee. From and after the Release Date (as defined in the Eleventh
Supplemental Indenture to the Original Indenture), this shall constitute one of
the unsecured Obligations referred to in and entitled to the benefits of that
Amended and Restated Indenture, dated as of September 1, 2001, between Old
Dominion Electric Cooperative and SunTrust Bank, successor by merger to Crestar
Bank, as trustee, as the same has been and may be supplemented, modified or
amended and effective from time to time (the "Restated Indenture"), which
Restated Indenture amends and supersedes the Original Indenture in its entirety
from and after the Release Date. The Original Indenture, including all
indentures supplemental thereto and effective prior to the Release Date,
contains a statement of the description of the properties thereby mortgaged,
pledged and assigned, the nature and extent of the security and the respective
rights, limitations of rights, duties and immunities thereunder of the Company,
the Trustee and the Holders of the Bonds

                                       A-2

<PAGE>

and of the terms upon which the Bonds are, and are to be, authenticated and
delivered, in each case prior to the Release Date. The Restated Indenture
contains a statement of the respective rights, limitations of rights, duties and
immunities thereunder of the Company, the Trustee and the Holders of the
Obligations and of the terms upon which the Obligations are, and are to be,
authenticated and delivered from and after the Release Date. From and after the
Release Date, the term "Bond" as used in this instrument shall be construed to
mean "Obligation" as that term is used in the Restated Indenture and all
indentures supplemental thereto. The term "Indenture" as used herein means the
Original Indenture prior to the Release Date and the Restated Indenture from and
after the Release Date. This Bond is one of the series and maturity designated
on the face hereof, limited in aggregate principal amount to Two Hundred Fifty
Million Dollars ($250,000,000).

         The 2003 Series A Bonds are subject to redemption on December 1 on each
year, commencing with the year 2005 and ending with the year 2027, through
operation of the sinking fund for the the 2003 Series A Bonds at a Redemption
Price equal to 100% of the principal amount being redeemed plus accrued interest
through the Redemption Date (subject to the right of holders of record on the
relevant record date to receive interest due on an interest payment date that is
on or prior to the Redemption Date). As a sinking fund for the 2003 Series A
Bonds, the Company shall redeem on December 1 in each year beginning with the
year 2005 and ending with the year 2027 the aggregate principal amount of the
2003 Series A Bonds specified in the following table:

                                                    Aggregate Principal
         Year                                     Amount of 2003 Series A
         ----                                              Bonds
                                                           -----
         December 1, 2005.............................  $10,417,000
         December 1, 2006.............................  $10,417,000
         December 1, 2007.............................  $10,417,000
         December 1, 2008.............................  $10,417,000
         December 1, 2009.............................  $10,417,000
         December 1, 2010.............................  $10,417,000
         December 1, 2011.............................  $10,417,000
         December 1, 2012.............................  $10,417,000
         December 1, 2013.............................  $10,417,000
         December 1, 2014.............................  $10,417,000
         December 1, 2015.............................  $10,417,000
         December 1, 2016.............................  $10,417,000
         December 1, 2017.............................  $10,417,000
         December 1, 2018.............................  $10,417,000
         December 1, 2019.............................  $10,417,000
         December 1, 2020.............................  $10,417,000
         December 1, 2021.............................  $10,416,000
         December 1, 2022.............................  $10,416,000
         December 1, 2023.............................  $10,416,000
         December 1, 2024.............................  $10,416,000
         December 1, 2025.............................  $10,416,000
         December 1, 2026.............................  $10,416,000
         December 1, 2027.............................  $10,416,000

                                      A-3

<PAGE>

         The principal amount of the 2003 Series A Bonds acquired and
surrendered for cancellation or redeemed by the Company (otherwise than through
operation of the sinking fund) shall be credited against sinking fund payments
for the 2003 Series A Bonds (including, for purposes of this paragraph, as a
sinking fund payment, $10,416,000 principal amount of 2003 Series A Bonds not to
be redeemed through operation of the sinking fund but to be repaid at maturity
on December 1, 2028) in proportion to the respective amounts of such required
sinking fund payments.

         The particular 2003 Series A Bonds to be redeemed through sinking fund
payments, shall be selected by the Trustee from the Outstanding 2003 Series A
Bonds which have not been previously been called for redemption by prorating, as
nearly as may be, the principal amount of the 2003 Series A Bonds to be redeemed
among the Holders thereof in proportion to the aggregate principal amount
thereof registered in their respective names; EXCEPT that, if there shall have
been previously filed with the Trustee an Act of all of the Holders thereof
satisfactory to the Trustee specifying the method of selecting the 2003 Series A
Bonds to be redeemed, such selection shall be made by the Trustee in accordance
with the terms of such Act.

         In addition, this Bond is subject to redemption, as a whole or in part,
at the election of the Company at a Redemption Price equal to the greater of (i)
100% of the principal amount of the portion of the Bond being redeemed plus all
accrued, but not yet due and payable, interest to the Redemption Date; and (ii)
the sum of the present values of all principal and interest payments scheduled
to become due after the date of such redemption in respect of the portion of the
Bond being redeemed, discounted on a semi-annual basis (assuming a 360-day year
consisting of twelve 30-day months) and calculated using a discount rate equal
to the sum of (A) the yield to maturity of the U.S. Treasury security having a
life equal to the remaining average life of the Bond to be redeemed and trading
in the secondary market at the price closest to par, and (B) twenty (20) basis
points; provided, however, that if there is no U.S. Treasury security having a
life equal to the remaining average life of the Bond to be redeemed, such
discount rate shall be calculated using a yield to maturity interpolated or
extrapolated on a straight-line basis (rounding to the nearest calendar month,
if necessary) from the yields to maturity of two (2) U.S. Treasury securities
having lives most closely corresponding to the remaining average life of the
Bond to be redeemed and trading in the secondary market at the prices closest to
par. The foregoing calculations shall be made in accordance with the Sixteenth
Supplemental Indenture to the Indenture. In addition, any interest due and
payable but unpaid on the portion of this 2003 Series A Bond being redeemed
shall be paid on the Redemption Date therefor.

         The calculations set forth in the immediately preceding paragraph shall
be determined on the third business day prior to the scheduled Redemption Date
by an investment banking institution of national standing in the United States
selected by the Company or, if the Trustee does not receive notice of such
selection at least ten days prior to a scheduled Redemption Date or if an Event
of Default under the Indenture shall have occurred and be continuing, selected
by the Trustee. If less than all the 2003 Series A Bonds are to be redeemed
pursuant to the preceding paragraph, the particular 2003 Series A Bonds to be
redeemed shall be selected not more than sixty (60) days prior to the Redemption
Date by the Trustee from the Outstanding Obligations of such series or maturity
within a series which have not previously been called for redemption by such
method as the Trustee shall deem fair and appropriate. In any such selection,
the Trustee shall make such adjustments, reallocations and eliminations as it
shall deem proper to the end that the principal amount the 2003 Series A Bonds
so selected shall be equal to $1,000, or an integral multiple thereof.

                                       A-4

<PAGE>

         In the event of a redemption of all or a portion of this Bond, the
Company shall cause notice of such redemption to be given to each Holder of such
Bonds to be redeemed at his or her address as the same shall last appear upon
the Bond Register, by first class mail at least 30 and no more than 60 days
prior to the Redemption Date; provided that so long as the Bonds to be redeemed
are held in a Book-Entry System, notice of redemption shall be given to the
registered Holders thereof at the time and in the manner required in the DTC
Letter of Representations executed among the Company, the Trustee and DTC in
connection with the issuance and sale of such Bonds, and the Trustee shall not
be required to give any other notice of redemption otherwise required in the
Indenture.

         In the event of a redemption of this Bond in part only, a new Bond or
Bonds of this series and maturity for the unredeemed portion hereof will be
issued in the name of the Holder hereof upon the cancellation hereof.

         Except as otherwise provided above, this Bond is not redeemable at any
time prior to its Stated Maturity.

         The Indenture permits, with certain exceptions as therein provided, the
amendment thereof and the modification of the rights and obligations of the
Company and the rights of the Holders of this Bond under the Indenture at any
time by the Company with the consent of the Holders of a majority in aggregate
principal amount of Bonds of all series at the time Outstanding affected by such
modification. The Indenture also contains provisions permitting the Holders of a
majority in principal amount of Bonds at the time Outstanding, on behalf of the
Holders of all Bonds to waive compliance by the Company with certain provisions
of the Indenture and certain past defaults under the Indenture and their
consequences. Any such consent or waiver by the Holder of this Bond shall be
conclusive and binding upon such Holder and upon all future Holders of this Bond
and of any Bond issued upon the registration of transfer hereof or in exchange
herefor or in lieu hereof, whether or not notation of such consent or waiver is
made upon this Bond.

         No reference herein to the Indenture and no provision of this Bond or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal and Redemption Price of and
interest on this Bond at the times, places and rates, and in the coin or
currency, herein prescribed.

         As provided in the Indenture and subject to certain limitations therein
set forth, the transfer of this Bond is registrable in the Bond Register, upon
surrender of this Bond for registration of transfer at the office or agency
maintained by the Bond Registrar in the Place of Payment therefor, duly endorsed
by, or accompanied by a written instrument of transfer in form satisfactory to
the Company and the Bond Registrar duly executed by, the Holder hereof or his
attorney duly authorized in writing, and thereupon one or more new Bonds of this
series and maturity, of authorized denominations and for the same aggregate
principal amount, will be issued to the designated transferee or transferees.

         The Bonds of this series and maturity are issuable only in registered
form without coupons in denominations of $1,000 and any integral multiple
thereof. As provided in the Indenture and subject to certain limitations therein
set forth, Bonds of this series and maturity are exchangeable for a like
aggregate principal amount of Bonds of this series of a different authorized
denomination as requested by the Holder surrendering the same.

                                       A-5

<PAGE>

         No service charge shall be made for any such registration of transfer
or exchange, but the Company may require payment of a sum sufficient to cover
any tax or other governmental charge payable in connection therewith.

         Prior to due presentment of this Bond for registration of transfer, the
Company, the Trustee and any agent of the Company or the Trustee may treat the
Person in whose name this Bond is registered as the owner hereof for all
purposes, whether or not this Bond be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         The Bonds of this series initially shall be held in a Book-Entry
System. While the Bonds or this series are held in the Book-Entry System,
payment of the principal and Redemption Price of and interest on such Bonds
shall be made by wire transfer of Federal Reserve funds or equivalent same-day
funds, or in such other manner as permitted by the DTC Letter of Representations
executed by the Company in connection with such series (as the same may be
amended from time to time), to the account of Cede & Co. In the event the Bonds
of this series are no longer held in the Book-Entry System, (i) interest on such
Bonds shall be payable on each Interest Payment Date by check payable to the
Holder (except that if so instructed in writing by a Holder of $1,000,000 or
more of such Bonds on or prior to the applicable Regular Record Date, such
payments shall be made by wire transfer of Federal Reserve funds on the Interest
Payment Date), mailed to the Holder at his or her address as it appears on the
Bond Register on the last day of the calendar month prior to the Interest
Payment Date, or in such other manner as such Holder and the Trustee may
determine, and (ii) principal shall be payable only upon presentation and
surrender of each such Bond, as the same becomes due, at the office from which
the Trustee performs the payment function for such Bonds. Except as may be
provided in the DTC Letter of Representations with respect to Bonds of this
series then held in the Book-Entry System, payment of principal (other than
through operation of the sinking fund) shall be made only upon presentation and
surrender of each such Bond, as the same becomes due, at the office from which
the Trustee performs the payment function for such Bonds.

         All terms used in this Bond which are defined in the Indenture shall
have the meanings assigned to them in the Indenture.

                                       A-6

<PAGE>

                          CERTIFICATE OF AUTHENTICATION

         This is one of the Bonds referred to in and secured by the Indenture of
Mortgage and Deed of Trust dated as of May 1, 1992 by and between Old Dominion
Electric Cooperative and Crestar Bank, as trustee, as the same may be
supplemented, modified or amended and effective from time to time prior to the
Release Date (the "Original Indenture"), under which the undersigned now acts as
Trustee. From and after the Release Date, this shall constitute one of the
unsecured Obligations referred to in and entitled to the benefits of that
Amended and Restated Indenture, dated as of September 1, 2001, between Old
Dominion Electric Cooperative and SunTrust Bank, successor by merger to Crestar
Bank, as trustee, as the same may be supplemented, modified or amended and
effective from time to time, which Restated Indenture amends and supersedes the
Original Indenture in its entirety from and after the Release Date.

                                                    SUNTRUST BANK, as Trustee



                                                    By: SPECIMEN
                                                        ------------------------
                                                        Authorized Signatory

                                       A-7