EXHIBIT 4.7.1(d)

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, ATLANTA,
                                       TRUSTEE



                                 THIRD SUPPLEMENTAL 
                                      INDENTURE


                                   Relating to the
                              Series 1997A (Monroe) Note


                             Dated as of January 1, 1998



                              FIRST MORTGAGE OBLIGATIONS

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




     THIS THIRD SUPPLEMENTAL INDENTURE, dated as of January 1, 1998, 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, 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 Monroe County (the "Monroe 
Authority") issued  $143,710,000 in aggregate principal amount of Development 
Authority of Monroe County Pollution Control Revenue Bonds (Oglethorpe Power 
Corporation Scherer Project), Series 1992A (the "Series 1992A Bonds"), of 
which $5,330,000 in aggregate principal amount matures on January 1, 1998 
(the "Series 1992A Maturities");

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

     WHEREAS, on December 10, 1997, the Monroe Authority issued $5,330,000 in 
aggregate principal amount of Development Authority of Monroe County 
Pollution Control Revenue Bonds (Oglethorpe Power Corporation Scherer 
Project), Series 1997A (the "Series 1997A (Monroe) Bonds"), the proceeds from 
the sale of which were loaned to the Company pursuant to that certain Loan 
Agreement, dated as of December 1, 1997 (the "Series 1997A (Monroe) Loan 
Agreement,"), between the Monroe Authority and the Company to refund the 
Series 1992A Maturities and to make the related payments on the Series 1992A 
Note;

     WHEREAS, the Company's obligation to repay the loan of the proceeds of 
the Series 1997A (Monroe) Bonds is evidenced by that certain Series 1997A 
(Monroe) Note, dated as of December 1, 1997 (the "Unsecured Note"), from the 
Company to SunTrust Bank, Atlanta, as trustee (in such capacity, the "Series 
1997A (Monroe) Trustee"), as assignee and pledgee of the Monroe Authority 
pursuant to the Indenture of Trust, dated as of December 1, 1997 (the "Series 
1997A (Monroe) Indenture"), between the Monroe Authority and the Series 1997A 
(Monroe) Trustee;





     WHEREAS, as permitted by Section 4.9 of the Series 1997A (Monroe) Loan 
Agreement, the Company desires to deliver to the Series 1997A (Monroe) 
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 Third 
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 1997A (Monroe) Note, dated the date of its authentication 
(the "Series 1997A (Monroe) Note"), from the Company to the Series 1997A 
(Monroe) Trustee, as assignee and pledgee of the Monroe Authority pursuant to 
the Series 1997A (Monroe) Indenture, as an Additional Obligation and 
specifying the form and provisions of the Series 1997A (Monroe) Note (the 
Original Indenture, as heretofore and hereby supplemented and modified, being 
herein sometimes called the "Indenture"); 

     WHEREAS, pursuant to Section 4.9 of the Series 1997A (Monroe) Loan 
Agreement, upon the authentication of the Series 1997A (Monroe) Note by the 
Trustee, the Series 1997A (Monroe) Note will be delivered to the Series 1997A 
(Monroe) 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 at the time Outstanding, 
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 the payment of 
the principal of (and premium, if any) and interest on the Series 1997A 
(Monroe) Note, to make the Series 1997A (Monroe) 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 1997A (Monroe) Note, in accordance with its terms, have been done and 
taken; and the execution and delivery of this Third Supplemental Indenture 
has been in all respects duly authorized;

     NOW, THEREFORE, THIS THIRD 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 1997A 
(Monroe) 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 1997A (Monroe) 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, 

                                   2 


rights, privileges and franchises acquired since the date of execution of the 
Original Indenture, including, without limitation, all property described in 
Exhibit A attached hereto, subject to all exceptions, reservations and 
matters of the character therein referred to, 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 
under the Original Indenture, 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 
Original 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 Original 
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 (as defined in Section 1.1 
of the Original Indenture) 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 

                                   3 




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.

     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 THIRD 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 herein contained in a timely manner, then the 
Indenture shall be canceled and surrendered.

     AND IT IS HEREBY COVENANTED AND DECLARED that the Series 1997A (Monroe) 
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 Original 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 1997A (MONROE) NOTE AND
                         CERTAIN PROVISIONS RELATING THERETO

     Section 1.1    Authorization and Terms of the Series 1997A (Monroe) Note.

     There shall be created and established an Additional Obligation in the 
form of a promissory note known as and entitled the  "Series 1997A (Monroe) 
Note" (hereinafter referred to as the "Series 1997A (Monroe) Note"), the 
form, terms and conditions of which shall be substantially as set forth 

                                   4




in this Section and Section 1.2.  The aggregate principal face amount of the 
Series 1997A (Monroe) Note which shall be authenticated and delivered and 
Outstanding at any one time is limited to $5,330,000.

     The Series 1997A (Monroe) Note shall be dated the date of its 
authentication. The Series 1997A (Monroe) Note shall mature on January 1, 
2018 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 in Section 1.2.  The Series 1997A (Monroe) Note shall be 
authenticated and delivered to, and made payable to, SunTrust Bank, Atlanta, 
as trustee (in such capacity, the "Series 1997A (Monroe) Trustee"), as 
assignee and pledgee of the Development Authority of Monroe County (the 
"Monroe Authority") pursuant to the Series 1997A (Monroe) Indenture.

     All payments made on the Series 1997A (Monroe) Note shall be made to the 
Series 1997A (Monroe) 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 1997A (Monroe) Note.

     The Series 1997A (Monroe) Note and the Series 1997A (Monroe) Trustee's 
authentication certificate to be executed on the Series 1997A (Monroe) 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 1997A (Monroe) Note for the
                    Unsecured Note.

     Upon its authentication, the Series 1997A (Monroe) Note shall be 
delivered to the Series 1997A (Monroe) Trustee in substitution for the 
Unsecured Note in accordance with Section 4.9 of the Series 1997A (Monroe) 
Loan Agreement.  Thereafter, the Series 1997A (Monroe) Note shall evidence 
the loan theretofore evidenced by the Unsecured Note.


                                      ARTICLE II

                                    MISCELLANEOUS

     Section 2.1    This Third 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 Original Indenture shall 
be applicable to the Series 1997A (Monroe) Note to the same extent as if 
specifically set forth herein.  All capitalized terms used in this Third 
Supplemental Indenture shall have the same meanings ascribed to them in the 
Original Indenture, except in cases where the context clearly indicates 
otherwise.

                                   5




     Section 2.2    All recitals in this Third 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.

     Section 2.3    Whenever in this Third 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 Third 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 Third 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 Third Supplemental Indenture or any covenant, 
condition, stipulation, promise or agreement hereof, and all the covenants, 
conditions, stipulations, promises and agreements in this Third 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 Third 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 Third 
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 Trustees, as secured party is:

                     SunTrust Bank, Atlanta 
                     58 Edgewood Avenue, Room 400A
                     Atlanta, Georgia 30303

                                   6




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

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


2100 East Exchange Place
P. O. Box 1349
Tucker, Georgia 30085-1349

                                    By:  /s/  T. D. Kilgore 
                                         --------------------
                                         T. D. Kilgore
                                         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/  Kathy C. Joiner                           
- -------------------------
Witness

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

(Notarial Seal)

My commission expires:    November 14, 2000          
                       ----------------------



                 [Signatures Continued on Next Page.]



 
                 [Signatures Continued from Previous Page.]




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

                                   By:  /s/  Phillip D. DeMouey   
                                        -----------------------
Signed, sealed and delivered            Name:  Phillip D. DeMouey
by the Trustee in the                   Title: Assistant Vice President
presence of:
                    
                                   By:  /s/  Ronald C. Painter        
                                        ------------------------
/s/  Brian Womble                       Name:  Ronald C. Painter
- -------------------                     Title: Vice President
Witness   

/s/  Teresa R. Turner 
- ---------------------
Notary Public                   
                                                [BANK SEAL] 

(Notarial Seal)

My commission expires:   April 3, 2001 
                       ----------------





                                   Exhibit A

     All property of the Company in the Counties of Appling, Ben Hill, 
Monroe, Carroll, Clarke, Cobb, DeKalb, Floyd, Fulton, Heard, Jackson, Monroe, 
and Toombs, State of Georgia, including, without limitation, the properties 
more specifically described below:

     No additional properties to be specifically described.

                                      A-1



                                      Exhibit B


                         [Form of Series 1997A (Monroe) Note]

THIS NOTE IS NON-TRANSFERABLE EXCEPT AS MAY BE REQUIRED TO EFFECT ANY 
TRANSFER TO ANY SUCCESSOR TRUSTEE UNDER THE INDENTURE OF TRUST, DATED AS OF 
DECEMBER 1, 1997, AS SUPPLEMENTED, BETWEEN THE DEVELOPMENT AUTHORITY OF 
MONROE COUNTY AND SUNTRUST BANK, ATLANTA, AS TRUSTEE.

                             OGLETHORPE POWER CORPORATION
                         (AN ELECTRIC MEMBERSHIP CORPORATION)

                            SERIES 1997A (MONROE) NOTE   DATE: January 14, 1998

                                  (SCHERER 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 Monroe County 
(the "Monroe Authority") to issue $9,305,000 in aggregate principal amount of 
Development Authority of Monroe County Pollution Control Revenue Bonds 
(Oglethorpe Power Corporation Scherer Project), Series 1997A (the "Series 
1997A (Monroe) Bonds"), hereby promises to pay to SunTrust Bank, Atlanta (the 
"Series 1997A (Monroe) Trustee"), as assignee and pledgee of the Monroe 
Authority, acting pursuant to the Indenture of Trust, dated as of December 1, 
1997, from the Monroe Authority to the Series 1997A Trustee (the "Series 
1997A Indenture"), or its successor in trust, the principal sum of 
$9,305,000, together with interest and prepayment premium (if any) thereon as 
follows:

               (1)  on or before each Interest Payment Date (as defined in 
the Indenture), a sum which will equal the interest on the Series 1997A 
(Monroe) Bonds which will become due on such Interest Payment Date on the 
Series 1997A (Monroe) Bonds; and

               (2)  on or before each January 1, commencing January 1, 1998, 
a sum which will equal the principal amount of the Series 1997A (Monroe) 
Bonds which will become due (whether at maturity or otherwise) on the next 
succeeding annual principal payment date on the Series 1997A (Monroe) Bonds; 
and

               (3)  on or before any redemption date for the Series 1997A 
(Monroe) Bonds, a sum equal to the principal of, redemption premium (if any) 
and interest on, the Series 1997A (Monroe) Bonds which are to be redeemed on 
such date; and

                                   B-1






               (4)  on or before each date on which the Series 1997A (Monroe) 
Bonds are required to be purchased pursuant to Section 4.01, 4.02 or 4.04 of 
the Indenture, a sum equal to the purchase price of all Series 1997A (Monroe) 
Bonds required to be purchased on such date.

     This Note is issued in substitution for and supersedes and replaces that 
certain Series 1997A (Monroe) Note, dated as of December 1, 1997, by 
Oglethorpe to the Series 1997A (Monroe) Trustee which was executed and 
delivered contemporaneously with the initial issuance of the Series 1997A 
(Monroe) Bonds.  This Note evidences the Loan (as defined in the Agreement 
hereinafter referred to) of the Monroe 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 as of December 1, 1997 (the "Agreement"), between the Monroe Authority 
and Oglethorpe, pursuant to which the Monroe Authority has agreed to loan to 
Oglethorpe the proceeds from the sale of the Series 1997A (Monroe) Bonds.

     This 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 Mortgage Indenture"), between Oglethorpe, as grantor, and SunTrust 
Bank, Atlanta, as trustee (in such capacity, the "Mortgage Indenture 
Trustee"), as supplemented by the First Supplemental Indenture, dated as of 
October 1, 1997 (the "First Supplemental Indenture"), the Second Supplemental 
Indenture, dated as of January 1, 1998 (the "Second Supplemental Indenture") 
and the Third Supplemental Indenture, dated as of January 1, 1998 (the "Third 
Supplemental Indenture"), between Oglethorpe and the Mortgage Indenture 
Trustee (the Original Indenture, as supplemented, the "Mortgage Indenture").  
Reference is hereby made to the Mortgage 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 Mortgage 
Indenture Trustee and the holder of this Note and of the terms upon which 
this Note is authenticated and delivered.  This Note is created by the Third 
Supplemental Indenture and designated as the "Series 1997A (Monroe) Note".

     All payments hereon are to be made to the Series 1997A 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 Note may be prepaid upon the terms and conditions set forth in
 Article V of the Agreement.

     If the Series 1997A Trustee shall accelerate payment of the Series 1997A
(Monroe) Bonds, all payments on this Note shall be declared due and payable
in the manner and with the effect 

                                   B-2




provided in the Agreement.  The Agreement provides that, under certain 
conditions, such declaration shall be rescinded by the Series 1997A Trustee.

     No recourse shall be had for the payments required hereby or for any 
claim based herein or in the Agreement or in the Mortgage 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 Note shall not be entitled to any benefit under the Mortgage 
Indenture and shall not become valid or obligatory for any purposes until the 
Mortgage Indenture Trustee shall have signed the form of authentication 
certificate endorsed hereon.

     This Note shall be governed by and construed in accordance with the laws 
of the State of Georgia.

                                   B-3




     IN WITNESS WHEREOF, Oglethorpe has caused this 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:
                                      ---------------------------
                                      T. D. Kilgore
                                      President and Chief Executive Officer

(SEAL)


Attest:

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

                                   B-4





                       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, ATLANTA, as Trustee

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













                                   B-5