Document:

<PAGE>
                                                                    EXHIBIT 10.9

CONFIDENTIAL TREATMENT REQUESTED. CONFIDENTIAL PORTIONS OF THIS DOCUMENT HAVE
BEEN REDACTED AND HAVE BEEN SEPARATELY FILED WITH THE COMMISSION.

                    [LOGO OF SUNRISE TELECOM INCORPORATED]

                       2001 Executive Officers Bonus Plan

Executive Officers will participate in the 2001 Executive Officers Bonus Plan
(the "Executive Officers Bonus Plan") as stated below, subject to approval by
the Compensation Committee of the Board of Directors of the Company.

Executive Officers
------------------
Paul K. Chang - CEO & President
Paul A. Marshall - COO & VP Marketing
Robert C. Pfeiffer - CTO & VP Engineering
Peter L. Eidelman - CFO & Treasurer

                            2001 Executive Officers
                              Bonus Plan Formula

1.   The Executive Officers Bonus will be based on a percentage of their base
     compensation for the period enrolled in the plan.

2.   The formula will be based on both the year's profit percentage, and sales
     growth percentage.

3.   The bonus formula will include an upside to motivate the Executive Officers
     to achieve exceptional Company financial performance. It will also include
     a downside resulting in no annual bonus awarded.

4.   The bonus can range from 0 to a maximum of 50% times the base salary for
     the period enrolled. The Company maintains the right to reduce the
     calculated amount of the formula to be sure that the employee profit
     sharing plan for the entire Company employees is not reduced while
     benefiting the Executive Officers.

5.   The 2001 goal is to obtain employee profit sharing between 15% to 25% while
     maintaining sales growth in excess of [*] and a net income percentage to
     equal or exceed [*] of sales. The Executive Officers Bonus will only exceed
     25% when employee profit sharing reaches 25%. Executive Officers Bonus
     payments will be accrued in excess of 25% in the event of exceptional
     performance exceeding the stated sales growth and net income percentage
     stated above.

  * Confidential material redacted and filed separately with the Commission.
<PAGE>

6.   In the event of a material corporate reorganization, the formula will need
     to be reevaluated.

7.   Yearly net income, yearly sales, previous year sales are as reported on the
     Company's audited financial statements.

Bonus =   [*]

definitions:
p = year profit % = yearly net income / yearly sales
sg = sales growth percentage = (current year sales - previous year sales) /
     previous year sales

  * Confidential material redacted and filed separately with the Commission.EXHIBIT 4.7.1(n)

                                                      Upon recording, return to:
                                                            Ms. Shawne M. Keenan
                                                 Sutherland Asbill & Brennan LLP
                                                      999 Peachtree Street, N.E.
                                                     Atlanta, Georgia 30309-3996

         PURSUANT TO SECTION 44-14-35.1 OF OFFICIAL CODE OF GEORGIA ANNOTATED,
  THIS INSTRUMENT EMBRACES, COVERS AND CONVEYS SECURITY TITLE TO AFTER-ACQUIRED
                             PROPERTY OF THE GRANTOR

                          OGLETHORPE POWER CORPORATION
                      (AN ELECTRIC MEMBERSHIP CORPORATION),
                                    GRANTOR,

                                       to

                                 SUNTRUST BANK,
                                     TRUSTEE

                             THIRTEENTH SUPPLEMENTAL
                                    INDENTURE

                                 Relating to the
                            Series 2000 (Burke) Note

                           Dated as of January 1, 2001

                           FIRST MORTGAGE OBLIGATIONS

<PAGE>

         THIS THIRTEENTH SUPPLEMENTAL INDENTURE, dated as of January 1, 2001, is
between OGLETHORPE POWER CORPORATION (AN ELECTRIC  MEMBERSHIP  CORPORATION),  an
electric  membership  corporation  organized and existing  under the laws of the
State of Georgia, as Grantor  (hereinafter  called the "Company"),  and SUNTRUST
BANK, formerly known as SunTrust Bank, Atlanta, a banking corporation  organized
and  existing  under  the laws of the  State of  Georgia,  as  Trustee  (in such
capacity, the "Trustee").

         WHEREAS,  the Company has  heretofore  executed  and  delivered  to the
Trustee  an  Indenture,  dated as of  March  1,  1997  (hereinafter  called  the
"Original  Indenture") for the purpose of securing its Existing  Obligations and
providing for the authentication  and delivery of Additional  Obligations by the
Trustee from time to time under the Original  Indenture  (capitalized terms used
herein  shall have the meanings  ascribed to them in the  Original  Indenture as
provided in Section 2.1 hereof);

         WHEREAS,  the  Development   Authority  of  Burke  County  (the  "Burke
Authority")  issued  $199,690,000 in aggregate  principal  amount of Development
Authority of Burke County  Adjustable  Tender  Pollution  Control  Revenue Bonds
(Oglethorpe Power Corporation  Vogtle Project),  Series 1993A (the "Series 1993A
Bonds"), of which $2,760,000 in principal amount is subject to mandatory sinking
fund redemption on January 1, 2001 (the "1993A Sinking Fund Maturities");

         WHEREAS,  the Burke Authority  loaned the proceeds from the sale of the
Series  1993A  Bonds to the  Company,  with such loan  being  evidenced  by that
certain  Series  1993A Note,  dated as of December  1, 1992 (the  "Series  1993A
Note"), from the Company to SunTrust Bank, formerly known as Trust Company Bank,
as trustee (in such  capacity,  the "Series  1993A  Trustee"),  as assignee  and
pledgee of the Burke  Authority  pursuant  to the Trust  Indenture,  dated as of
December 1, 1992 (the "Series 1993A Indenture"), between the Burke Authority and
the Series 1993A Trustee;

         WHEREAS, the Burke Authority issued $155,610,000 in aggregate principal
amount of Development  Authority of Burke County Pollution Control Revenue Bonds
(Oglethorpe Power Corporation  Vogtle Project),  Series 1993B (the "Series 1993B
Bonds"), of which $9,080,000 in aggregate principal amount matures on January 1,
2001 (the "1993B Maturities");

         WHEREAS,  the Burke Authority  loaned the proceeds from the sale of the
Series  1993B  Bonds to the  Company,  with such loan  being  evidenced  by that
certain  Series 1993B Note,  dated as of  September  1, 1993 (the "Series  1993B
Note"), from the Company to SunTrust Bank, formerly known as Trust Company Bank,
as trustee (in such  capacity,  the "Series  1993B  Trustee"),  as assignee  and
pledgee of the Burke  Authority  pursuant  to the Trust  Indenture,  dated as of
September 1, 1993 (the "Series 1993B  Indenture"),  between the Burke  Authority
and the Series 1993B Trustee;

<PAGE>

         WHEREAS, the Burke Authority issued $122,740,000 in aggregate principal
amount of  Development  Authority of Burke County  Adjustable  Tender  Pollution
Control Revenue Bonds  (Oglethorpe  Power  Corporation  Vogtle Project),  Series
1994A (the "Series 1994A  Bonds"),  of which  $2,230,000 in aggregate  principal
amount is subject to mandatory  sinking fund  redemption on January 1, 2001 (the
"1994A Sinking Fund Maturities");

         WHEREAS,  the Burke Authority  loaned the proceeds from the sale of the
Series  1994A  Bonds to the  Company,  with such loan  being  evidenced  by that
certain  Series  1994A Note,  dated as of December  1, 1992 (the  "Series  1994A
Note"), from the Company to SunTrust Bank, formerly known as Trust Company Bank,
as trustee (in such  capacity,  the "Series  1994A  Trustee"),  as assignee  and
pledgee of the Burke  Authority  pursuant  to the Trust  Indenture,  dated as of
December 1, 1992 (the "Series 1994A Indenture"), between the Burke Authority and
the Series 1994A Trustee;

         WHEREAS,  the Burke Authority issued $13,720,000 in aggregate principal
amount of Development  Authority of Burke County Pollution Control Revenue Bonds
(Oglethorpe Power Corporation  Vogtle Project),  Series 1994B (the "Series 1994B
Bonds";  the Series 1993A Bonds,  the Series 1993B Bonds, the Series 1994A Bonds
and the Series 1994B Bonds,  collectively,  the "Outstanding  Bonds"),  of which
$1,615,000 in aggregate  principal amount matures on January 1, 2001 (the "1994B
Maturities";  the 1993A Sinking Fund Maturities, the 1993B Maturities, the 1994A
Sinking  Fund  Maturities  and the  1994B  Maturities,  collectively,  the "2001
Maturities");

         WHEREAS,  the Burke Authority  loaned the proceeds from the sale of the
Series  1994B  Bonds to the  Company,  with such loan  being  evidenced  by that
certain  Series 1994B Note,  dated as of  September  1, 1994 (the "Series  1994B
Note";  the Series 1993A Note,  the Series 1993B Note, the Series 1994A Note and
the Series 1994B Note, collectively,  the "Outstanding Notes"), from the Company
to SunTrust  Bank,  formerly  known as Trust  Company  Bank, as trustee (in such
capacity,  the "Series  1994B  Trustee"),  as assignee  and pledgee of the Burke
Authority  pursuant to the Trust  Indenture,  dated as of September 1, 1994 (the
"Series  1994B  Indenture"),  between the Burke  Authority  and the Series 1994B
Trustee;

         WHEREAS,  on October 5, 2000, the Burke Authority issued $15,685,000 in
aggregate  principal  amount of Development  Authority of Burke County Pollution
Control Revenue Bonds (Oglethorpe Power Corporation Vogtle Project), Series 2000
(the  "Series  2000 (Burke)  Bonds"),  the proceeds  from the sale of which were
loaned to the  Company  pursuant to that  certain  Loan  Agreement,  dated as of
October 1, 2000 (the "Series 2000  (Burke) Loan  Agreement"),  between the Burke
Authority and the Company to refund the 2001  Maturities and to make the related
payments due on the Outstanding Notes;

         WHEREAS,  the Company's obligation to repay the loan of the proceeds of
the Series 2000 (Burke)  Bonds is evidenced by that certain  Series 2000 (Burke)
Note, dated October 5, 2000 (the "Unsecured Note"), from the Company to SunTrust
Bank,  formerly known as SunTrust Bank,  Atlanta,  as trustee (in such capacity,
the  "Series  2000  (Burke)  Trustee"),  as  assignee  and  pledgee of the Burke
Authority  pursuant  to the Trust  Indenture,  dated as of  October 1, 2000 (the
"Series 2000 (Burke)  Indenture"),  between the Burke  Authority  and the Series
2000 (Burke) Trustee;

                                       2
<PAGE>

         WHEREAS,  as  permitted  by Section 4.9 of the Series 2000 (Burke) Loan
Agreement,  the Company  desires to deliver to the Series 2000 (Burke) Trustee a
promissory  note  secured  under  the  Indenture  (as  hereinafter  defined)  in
substitution for the Unsecured Note;

         WHEREAS,  the Company  desires to execute and deliver  this  Thirteenth
Supplemental  Indenture,  in  accordance  with the  provisions  of the  Original
Indenture, for the purpose of providing for the creation and designation of that
certain  Series 2000 (Burke)  Note,  dated the date of its  authentication  (the
"Series  2000  (Burke)  Note"),  from the  Company  to the Series  2000  (Burke)
Trustee,  as assignee and pledgee of the Burke Authority  pursuant to the Series
2000 (Burke) Indenture,  as an Additional Obligation and specifying the form and
provisions thereof (the Original Indenture, as heretofore,  hereby and hereafter
supplemented and modified, being herein sometimes called the "Indenture");

         WHEREAS,  pursuant  to Section  4.9 of the  Series  2000  (Burke)  Loan
Agreement,  upon the  authentication  of the  Series  2000  (Burke)  Note by the
Trustee,  the Series  2000  (Burke)  Note will be  delivered  to the Series 2000
(Burke) Trustee in substitution for the Unsecured Note;

         WHEREAS,  Section 12.1 of the Original Indenture provides that, without
the  consent  of  the  Holders  of any of the  Obligations,  the  Company,  when
authorized by a Board Resolution,  and the Trustee,  may enter into Supplemental
Indentures  for the  purposes  and subject to the  conditions  set forth in said
Section 12.1; and

         WHEREAS,  all acts and proceedings  required by law and by the Articles
of  Incorporation  and  Bylaws of the  Company  necessary  to  secure  under the
Indenture the payment of the principal of (and premium,  if any) and interest on
the Series 2000 (Burke)  Note, to make the Series 2000 (Burke) Note to be issued
hereunder,  when  executed by the Company,  authenticated  and  delivered by the
Trustee and duly issued, the valid, binding and legal obligation of the Company,
and to constitute the Indenture a valid and binding lien for the security of the
Series 2000  (Burke)  Note,  in  accordance  with its terms,  have been done and
taken; and the execution and delivery of this Thirteenth  Supplemental Indenture
has been in all respects duly authorized by the Company;

         NOW, THEREFORE, THIS THIRTEENTH SUPPLEMENTAL INDENTURE WITNESSES, that,
to secure the payment of the principal of (and premium,  if any) and interest on
the Outstanding  Secured  Obligations,  including,  when issued, the Series 2000
(Burke)  Note,  to  confirm  the lien of the  Indenture  upon the Trust  Estate,
including property  purchased,  constructed or otherwise acquired by the Company
since the date of execution of the Original Indenture,  to secure performance of
the covenants therein and herein contained,  to declare the terms and conditions
on which the Series 2000 (Burke) Note is 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, and its successors and
assigns in the trust created thereby and hereby, in trust, all property, rights,
privileges and franchises (other than Excepted Property or Excludable  Property)
of the  Company  of the  character  described  in the  Granting  Clauses  of the
Original  Indenture,   including  all  such  property,  rights,  privileges  and
franchises  acquired  since the date of  execution  of the  Original  Indenture,
including,  without  limitation,  all  property  described in Exhibit A attached

                                       3
<PAGE>

hereto,  subject to all  exceptions,  reservations  and matters of the character
referred to in the Indenture, and does grant a security interest therein for the
purposes  expressed herein and in the Original Indenture subject in all cases to
Sections  5.2 and 11.2 B of the  Original  Indenture  and to the  rights  of the
Company under the Original Indenture,  including the rights set forth in Article
V thereof;  but expressly excepting and excluding from the lien and operation of
the Indenture all properties of the character specifically excepted as "Excepted
Property"  or  "Excludable  Property"  in the  Original  Indenture to the extent
contemplated thereby.

         PROVIDED, HOWEVER, that if, upon the occurrence of an Event of Default,
the Trustee, or any separate trustee or co-trustee  appointed under Section 9.14
of the  Original  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 H, inclusive,  of "Excepted Property" in the
Original  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 I, J, L, N and P of "Excepted  Property" in the Original Indenture
(excluding  the  property  described  in Section 2 of Exhibit B in the  Original
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 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 the Granting Clause Third of the
Original  Indenture,  subject to the lien of the Indenture any Excepted Property
or Excludable  Property,  whereupon the same shall cease to be Excepted Property
or Excludable Property.

         TO  HAVE  AND  TO  HOLD  all  such  property,  rights,  privileges  and
franchises  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
tenements,   hereditaments  and   appurtenances   thereto   appertaining   (said
properties, rights, privileges and franchises, including any cash and securities
hereafter deposited or required to be deposited with the Trustee (other than any
such cash which is specifically stated in the Indenture not to be deemed part of
the Trust Estate)  being part of the Trust  Estate),  unto the Trustee,  and its
successors and assigns in the trust herein created, forever.

         SUBJECT,  HOWEVER,  to (i) Permitted  Exceptions and (ii) to the extent
permitted  by Section 13.6 of the  Original  Indenture as to property  hereafter
acquired (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,  other  purchase  money  liens,  chattel  mortgages,
conditional sales agreements or other title retention  agreements created by the
Company at the time of acquisition thereof.

                                       4
<PAGE>

         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 Obligations without any priority of any such Obligation over
any  other  such  Obligation  and for the  enforcement  of the  payment  of such
Obligations in accordance with their terms.

         UPON  CONDITION  that,  until the  happening of an Event of Default and
subject to the  provisions  of Article V of the Original  Indenture,  and not in
limitation of the rights elsewhere provided in the Original Indenture, including
the rights set forth in Article V of the Original  Indenture,  the Company shall
be permitted to (i) possess and use the Trust Estate,  except cash,  securities,
Designated  Qualifying  Securities and other  personal  property  deposited,  or
required to be deposited,  with the Trustee,  (ii) explore for,  mine,  extract,
separate  and dispose of coal,  ore,  gas, oil and other  minerals,  and harvest
standing timber, and (iii) receive and use the rents, issues, profits,  revenues
and other income, products and proceeds of the Trust Estate.

         THE INDENTURE,  INCLUDING THIS THIRTEENTH  SUPPLEMENTAL  INDENTURE,  is
intended to operate and is to be construed as a deed passing  title to the Trust
Estate and is made under the  provisions  of the  existing  laws of the State of
Georgia  relating  to deeds to secure  debt,  and not as a  mortgage  or deed of
trust, and is given to secure the Outstanding  Secured  Obligations.  Should the
indebtedness  secured by the Indenture be paid according to the tenor and effect
thereof  when the same shall  become  due and  payable  and  should the  Company
perform all covenants therein  contained in a timely manner,  then the Indenture
shall be canceled and surrendered.

         AND IT IS HEREBY  COVENANTED  AND DECLARED that the Series 2000 (Burke)
Note is to be authenticated and delivered and the Trust Estate is to be held and
applied by the  Trustee,  subject to the  covenants,  conditions  and trusts set
forth  herein and 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 Outstanding Secured Obligations, as follows:

                                    ARTICLE I

                        THE SERIES 2000 (BURKE) NOTE AND
                       CERTAIN PROVISIONS RELATING THERETO

Section 1.1       Authorization and Terms of the Series 2000 (Burke) Note.

         There shall be created and established an Additional  Obligation in the
form of a promissory  note known as and entitled the "Series 2000 (Burke)  Note"
(hereinafter referred to as the "Series 2000 (Burke) Note"), the form, terms and
conditions  of which  shall be  substantially  as set forth in this  Section and
Section 1.2. The aggregate principal face amount of the Series 2000 (Burke) Note
which shall be  authenticated  and delivered and  Outstanding at any one time is
limited to $15,685,000.

                                       5
<PAGE>

         The  Series  2000   (Burke)  Note  shall  be  dated  the  date  of  its
authentication. The Series 2000 (Burke) Note shall mature on January 1, 2021 and
shall  bear  interest  from  the date of its  authentication  to the date of its
maturity at rates  calculated as provided for in the form of note  prescribed by
Section 1.2. The Series 2000 (Burke) Note shall be  authenticated  and delivered
to, and made  payable to,  SunTrust  Bank,  as trustee,  in its  capacity as the
Series 2000 (Burke) Trustee.

         All payments  made on the Series 2000 (Burke) Note shall be made to the
Series 2000  (Burke)  Trustee at its  principal  office in  Atlanta,  Georgia in
lawful money of the United States of America which will be immediately available
on the date payment is due.

Section 1.2       Form of the Series 2000 (Burke) Note.

         The Series 2000 (Burke) Note,  including  the Trustee's  authentication
certificate   to  be  executed  on  such  Series  2000  (Burke)  Note  shall  be
substantially  in the form of Exhibit B attached  hereto,  with such appropriate
insertions,  omissions,  substitutions  and other  variations as are required or
permitted in the Original Indenture.

Section 1.3 Substitution of the Series 2000 (Burke) Note for the Unsecured Note.

Upon its authentication,  the Series 2000 (Burke) Note shall be delivered to the
Series 2000 (Burke) Trustee in substitution for the Unsecured Note in accordance
with  Section 4.9 of the Series 2000  (Burke) Loan  Agreement.  Thereafter,  the
Series 2000 (Burke) Note shall  evidence the loan  theretofore  evidenced by the
Unsecured Note.

                                   ARTICLE II

                                  MISCELLANEOUS

Section 2.1 This  Thirteenth  Supplemental  Indenture  is executed  and shall be
construed as an indenture supplemental to the Original Indenture, and shall form
a part thereof,  and the Original Indenture,  as heretofore  supplemented and as
hereby  supplemented  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 Series 2000
(Burke)  Note to the same  extent  as if  specifically  set  forth  herein.  All
references  herein to Sections,  definitions or other provisions of the Original
Indenture shall be to such Sections,  definitions  and other  provisions as they
may be amended or  modified  from time to time  pursuant to the  Indenture.  All
capitalized terms used in this Thirteenth  Supplemental Indenture shall have the
same meanings ascribed to them in the Original Indenture,  except in cases where
the context clearly indicates otherwise.

Section 2.2 All recitals in this Thirteenth  Supplemental  Indenture are made by
the Company only and not by the Trustee;  and all of the provisions contained in
the Original 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.

                                       6
<PAGE>

Section  2.3  Whenever  in this  Thirteenth  Supplemental  Indenture  any of the
parties hereto is named or referred to, this shall, subject to the provisions of
Articles  IX and  XI of  the  Original  Indenture,  be  deemed  to  include  the
successors  and assigns of such party,  and all the covenants and  agreements in
this Thirteenth 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 2.4 Nothing in this  Thirteenth  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  Secured  Obligations,  any right,  remedy or claim under or by
reason of this  Thirteenth  Supplemental  Indenture or any covenant,  condition,
stipulation,  promise or agreement  hereof,  and all the covenants,  conditions,
stipulations,  promises and agreements in this Thirteenth 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  Secured
Obligations.

Section 2.5 This  Thirteenth  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  2.6  To  the  extent  permitted  by  applicable  law,  this  Thirteenth
Supplemental  Indenture shall be deemed to be a Security Agreement and Financing
Statement  whereby the Company grants to the Trustee 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:                       2100 East Exchange Place
                                    P. O. Box 1349
                                    Tucker, Georgia 30085-1349,

and the mailing address of the Trustee, as secured party, is:

                                    SunTrust Bank
                                    25 Park Place
                                    Atlanta, Georgia 30303-2900

                           [Signatures on Next Page.]

                                       7
<PAGE>

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

Company:                                OGLETHORPE POWER
                                        CORPORATION (AN ELECTRIC
                                        MEMBERSHIP  CORPORATION),  an electric
                                        membership  corporation  organized
                                        under the laws of the State of Georgia

                                        By:  /s/  Thomas A. Smith
                                           -------------------------------------
                                           Thomas A. Smith
                                           President and Chief Executive Officer

Signed, sealed and delivered            Attest: /s/  Patricia N. Nash
by the Company in the presence of:             ---------------------------------
                                               Patricia N. Nash
                                               Secretary
         /s/  Julia Dawn Mercer
------------------------------------
Witness

         /s/  Thomas J. Brendiar
------------------------------------
Notary Public                                                 [CORPORATE SEAL]

(Notarial Seal)

My commission expires:     October 22, 2004
                       ---------------------

                      [Signatures Continued on Next Page.]

<PAGE>

                   [Signatures Continued from Previous Page.]

Trustee:                               SUNTRUST BANK,
                                       a banking corporation  organized and
                                       existing under the laws of the State
                                       of Georgia

                                       By:      /s/  B.A. Donaldson
                                           -------------------------------------
Signed, sealed and delivered                B.A. Donaldson
by the Trustee in the                       Vice President
presence of:

                                       By:      /s/  George Hogan
                                           -------------------------------------
      /s/  Antoinette Sullivan              George Hogan
------------------------------              Vice President
Witness

      /s/  Jack Ellerin
------------------------------
Notary Public                                             [BANK SEAL]

(Notarial Seal)

My commission expires:         September 12, 2001
                      ----------------------------------

<PAGE>

                                    Exhibit A

         All  property  of the Company in the  Counties  of  Appling,  Ben Hill,
Burke, Carroll, Clarke, Cobb, DeKalb, Floyd, Fulton, Heard, Jackson, Monroe, and
Toombs, State of Georgia.

                                      A-1
<PAGE>

                                    Exhibit B

                       [Form of Series 2000 (Burke) Note]

THIS NOTE IS  NON-TRANSFERABLE  EXCEPT AS MAY BE REQUIRED TO EFFECT ANY TRANSFER
TO ANY SUCCESSOR TRUSTEE UNDER THE TRUST INDENTURE, DATED AS OF OCTOBER 1, 2000,
BETWEEN THE DEVELOPMENT AUTHORITY OF BURKE COUNTY AND SUNTRUST BANK, AS TRUSTEE.

                          OGLETHORPE POWER CORPORATION
                      (AN ELECTRIC MEMBERSHIP CORPORATION)

                            SERIES 2000 (BURKE) NOTE

                             DATE: February __, 2001

                                (VOGTLE PROJECT)

         OGLETHORPE  POWER  CORPORATION  (AN  ELECTRIC  MEMBERSHIP  CORPORATION)
("Oglethorpe"),  an electric membership corporation organized and existing under
the laws of the State of Georgia, for value received and in consideration of the
agreement of the Development  Authority of Burke County (the "Burke  Authority")
to issue $15,685,000 in aggregate  principal amount of Development  Authority of
Burke County  Pollution  Control  Revenue Bonds  (Oglethorpe  Power  Corporation
Vogtle Project),  Series 2000 (the "Series 2000 (Burke) Bonds"), hereby promises
to pay to SunTrust Bank,  formerly known as SunTrust Bank,  Atlanta (the "Series
2000 (Burke) Trustee"),  as assignee and pledgee of the Burke Authority,  acting
pursuant  to the Trust  Indenture,  dated as of October 1, 2000,  from the Burke
Authority to the Series 2000 (Burke) Trustee (the "Series 2000  Indenture"),  or
its successor in trust, the principal sum of $15,685,000, together with interest
and prepayment premium (if any) thereon as follows:

                  (a) on or before each Interest Payment Date (as defined in the
Series 2000  Indenture),  a sum which will equal the interest on the Series 2000
(Burke) Bonds which will become due on such Interest  Payment Date on the Series
2000 (Burke) Bonds; and

                  (b) on or before  January 1, 2021,  a sum which will equal the
principal  amount of the Series  2000  (Burke)  Bonds  which will  become due on
January 1, 2021; and

                  (c) on or  before  any  redemption  date for the  Series  2000
(Burke) Bonds, a sum equal to the principal of, redemption  premium (if any) and
interest  on, the Series  2000  (Burke)  Bonds  which are to be redeemed on such
date.

         This  Series  2000  (Burke)  Note is  issued  in  substitution  for and
supersedes and replaces that certain Series 2000 (Burke) Note,  dated October 5,
2000, by  Oglethorpe  to the Series 2000 (Burke)  Trustee which was executed and
delivered contemporaneously with the initial issuance of the Series 2000 (Burke)
Bonds.  This  Series 2000  (Burke)  Note  evidences  the Loan (as defined in the
Agreement  hereinafter referred to) of the Burke Authority to Oglethorpe and the
obligation  to repay the same and shall be  governed  by and shall be payable in
accordance  with the terms,  conditions  and  provisions of the Loan  Agreement,
dated  October  1, 2000 (the  "Agreement"),  between  the  Burke  Authority  and
Oglethorpe,  pursuant  to  which  the  Burke  Authority  has  agreed  to loan to
Oglethorpe the proceeds from the sale of the Series 2000 (Burke) Bonds.

                                       B-1
<PAGE>

         This  Series  2000  (Burke)  Note is a duly  authorized  obligation  of
Oglethorpe issued under and equally and ratably secured by the Indenture,  dated
as of March 1, 1997 (the "Original Indenture"),  as heretofore  supplemented and
as supplemented by the Thirteenth Supplemental Indenture, dated as of January 1,
2001 (the "Thirteenth Supplemental Indenture"),  and the Fourteenth Supplemental
Indenture,   dated  as  of  January  1,  2001  (the   "Fourteenth   Supplemental
Indenture"),  between Oglethorpe,  as grantor, and SunTrust Bank, formerly known
as  SunTrust  Bank,  Atlanta,  as  trustee  (in such  capacity,  the  "Indenture
Trustee"),  (the  Original  Indenture,  as  supplemented,   the  "  Indenture").
Reference is hereby made to the Indenture for 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  Oglethorpe,  the Indenture  Trustee and the holder of
this  Series  2000  (Burke)  Note and of the terms upon which this  Series  2000
(Burke) Note is  authenticated  and delivered.  This Series 2000 (Burke) Note is
created by the Thirteenth  Supplemental  Indenture and designated as the "Series
2000 (Burke) Note."

         All payments  hereon are to be made to the Series 2000 (Burke)  Trustee
at its  principal  office in  Atlanta,  Georgia,  in lawful  money of the United
States of America which will be immediately available on the day payment is due.
As set forth in Section 4.6 of the  Agreement,  the  obligation of Oglethorpe to
make the payments required hereunder shall be absolute and unconditional.

         Oglethorpe  shall be  entitled  to  certain  credits  against  payments
required to be made hereunder as provided in Section 4.3 of the Agreement.

         This  Series  2000  (Burke)  Note may be  prepaid  upon the  terms  and
conditions set forth in Article VIII of the Agreement.

         If the Series 2000  (Burke)  Trustee  shall  accelerate  payment of the
Series 2000 (Burke)  Bonds,  all payments on this Series 2000 (Burke) Note shall
be declared  due and  payable in the manner and with the effect  provided in the
Agreement.   The  Agreement  provides  that,  under  certain  conditions,   such
declaration shall be rescinded by the Series 2000 (Burke) Trustee.

         No recourse  shall be had for the payments  required  hereby or for any
claim based herein or in the Agreement or in the Indenture  against any officer,
director or member,  past,  present or future,  of  Oglethorpe  as such,  either
directly or through Oglethorpe, or under any constitution provision,  statute or
rule of law or by the enforcement of any assessment or by any legal or equitable
proceedings or otherwise.

         This  Series  2000  (Burke)  Note shall not be  entitled to any benefit
under the Indenture  and shall not become valid or  obligatory  for any purposes
until  the  Indenture  Trustee  shall  have  signed  the form of  authentication
certificate endorsed hereon.

                                       B-2
<PAGE>

         This Series 2000  (Burke)  Note shall be governed by and  construed  in
accordance with the laws of the State of Georgia.

         IN WITNESS WHEREOF, Oglethorpe has caused this Series 2000 (Burke) Note
to be  executed  in its  corporate  name by its  President  and Chief  Executive
Officer and  attested by its  Secretary  and its  corporate  seal to be hereunto
affixed.

                                        OGLETHORPE POWER CORPORATION
                                        (AN ELECTRIC MEMBERSHIP CORPORATION)

                                        By:________________________________
                                           Thomas A. Smith
                                           President and Chief Executive Officer
(SEAL)

Attest:

-------------------------------
Patricia N. Nash
Secretary

                                      B-3
<PAGE>

                     TRUSTEE'S CERTIFICATE OF AUTHENTICATION

         This  is one of  the  Obligations  of  the  series  designated  therein
referred to in the within mentioned Indenture.

                                      SUNTRUST BANK, as Trustee

                                      By:____________________________________
                                         Authorized Signatory

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