Exhibit 4.2(b)



                              ALABAMA POWER COMPANY

                                       TO

                              JPMORGAN CHASE BANK,
                                     TRUSTEE






                       TWENTY-FIRST SUPPLEMENTAL INDENTURE

                          DATED AS OF FEBRUARY 19, 2003






                                  $170,000,000


                           SERIES U 2.65% SENIOR NOTES

                              DUE FEBRUARY 15, 2006





<PAGE>


                               TABLE OF CONTENTS 1
                                                                       PAGE

ARTICLE 1  Series U Senior Notes........................................2
SECTION 101.  Establishment.............................................2
              -------------
SECTION 102.  Definitions...............................................3
              -----------
SECTION 103.   Payment of Principal and Interest........................3
               ---------------------------------
SECTION 104.  Denominations.............................................4
              -------------
SECTION 105.  Global Securities.........................................4
              -----------------
SECTION 106.  Transfer..................................................4
              --------
SECTION 107.  Redemption at the Company's Option........................4
              ----------------------------------

ARTICLE 2  Miscellaneous Provisions.....................................5
SECTION 201.  Recitals by Company.......................................5
              -------------------
SECTION 202. Ratification and Incorporation of Original Indenture.......5
             ----------------------------------------------------
SECTION 203.  Executed in Counterparts..................................5
              ------------------------


--------
1 This Table of Contents does not constitute part of the Indenture or have any
bearing upon the interpretation of any of its terms and provisions.



<PAGE>



                  THIS TWENTY-FIRST SUPPLEMENTAL INDENTURE is made as of the
19th day of February, 2003, by and between ALABAMA POWER COMPANY, an Alabama
corporation, 600 North 18th Street, Birmingham, Alabama 35291 (the "Company"),
and JPMORGAN CHASE BANK (formerly known as The Chase Manhattan Bank), a New York
banking corporation, 4 New York Plaza, New York, New York 10004 (the "Trustee").

                              W I T N E S S E T H:

                  WHEREAS, the Company has heretofore entered into a Senior Note
Indenture, dated as of December 1, 1997 (the "Original Indenture"), with the
Trustee, as supplemented by a First Supplemental Indenture, dated as of December
12, 1997 (the "First Supplemental Indenture"), a Second Supplemental Indenture,
dated as of February 26, 1998 (the "Second Supplemental Indenture"), a Third
Supplemental Indenture, dated as of April 23, 1998 (the "Third Supplemental
Indenture"), a Fourth Supplemental Indenture, dated as of August 19, 1998 (the
"Fourth Supplemental Indenture"), a Fifth Supplemental Indenture, dated as of
September 17, 1998 (the "Fifth Supplemental Indenture"), a Sixth Supplemental
Indenture, dated as of September 24, 1998 (the "Sixth Supplemental Indenture"),
a Seventh Supplemental Indenture, dated as of October 15, 1998 (the "Seventh
Supplemental Indenture"), an Eighth Supplemental Indenture, dated as of November
3, 1998 (the "Eighth Supplemental Indenture"), a Ninth Supplemental Indenture,
dated as of November 17, 1998 (the "Ninth Supplemental Indenture"), a Tenth
Supplemental Indenture, dated as of May 26, 1999 (the "Tenth Supplemental
Indenture"), an Eleventh Supplemental Indenture, dated as of August 19, 1999
(the "Eleventh Supplemental Indenture"), a Twelfth Supplemental Indenture, dated
as of September 30, 1999 (the "Twelfth Supplemental Indenture"), a Thirteenth
Supplemental Indenture, dated as of May 18, 2000 (the "Thirteenth Supplemental
Indenture"), a Fourteenth Supplemental Indenture, dated as of August 29, 2001
(the "Fourteenth Supplemental Indenture"), a Fifteenth Supplemental Indenture,
dated as of August 29, 2001 (the "Fifteenth Supplemental Indenture"), a
Sixteenth Supplemental Indenture, dated as of June 28, 2002 (the "Sixteenth
Supplemental Indenture"), a Seventeenth Supplemental Indenture, dated as of
October 22, 2002 (the "Seventeenth Supplemental Indenture"), an Eighteenth
Supplemental Indenture, dated as of November 26, 2002 (the "Eighteenth
Supplemental Indenture"), a Nineteenth Supplemental Indenture, dated as of
December 12, 2002 (the "Nineteenth Supplemental Indenture") and a Twentieth
Supplemental Indenture, dated as February 19, 2003 (the "Twentieth Supplemental
Indenture");

                  WHEREAS, the Original Indenture is incorporated herein by this
reference and the Original Indenture, as heretofore supplemented and as further
supplemented by this Twenty-First Supplemental Indenture, is herein called the
"Indenture";

                  WHEREAS, under the Original Indenture, a new series of Senior
Notes may at any time be established pursuant to a supplemental indenture
executed by the Company and the Trustee;

                  WHEREAS, the Company proposes to create under the Indenture a
new series of Senior Notes;

                  WHEREAS, additional Senior Notes of other series hereafter
established, except as may be limited in the Original Indenture as at the time
supplemented and modified, may be issued from time to time pursuant to the
Indenture as at the time supplemented and modified; and

                  WHEREAS, all conditions necessary to authorize the execution
and delivery of this Twenty-First Supplemental Indenture and to make it a valid
and binding obligation of the Company have been done or performed.

                  NOW, THEREFORE, in consideration of the agreements and
obligations set forth herein and for other good and valuable consideration, the
sufficiency of which is hereby acknowledged, the parties hereto hereby agree as
follows:

                         ARTICLE 1Series U Senior Notes

         SECTION 101. Establishment. There is hereby established a new series of
Senior Notes to be issued under the Indenture, to be designated as the Company's
Series U 2.65% Senior Notes due February 15, 2006 (the "Series U Notes").

         There are to be authenticated and delivered $170,000,000 aggregate
principal amount of Series U Notes, and such principal amount of the Series U
Notes may be increased from time to time pursuant to Section 301 of the
Indenture. All Series U Notes need not be issued at the same time and such
series may be reopened at any time, without the consent of any Holder, for
issuances of additional Series U Notes. Any such additional Series U Notes will
have the same interest rate, maturity and other terms as those initially issued.
No Series U Notes shall be authenticated and delivered in excess of the
principal amount as so increased except as provided by Sections 203, 303, 304 or
907 of the Original Indenture. The Series U Notes shall be issued in definitive
fully registered form.

         The Series U Notes shall be issued in the form of one or more Global
Securities in substantially the form set out in Exhibit A hereto. The Depositary
with respect to the Series U Notes shall be The Depository Trust Company.

         The form of the Trustee's Certificate of Authentication for the Series
U Notes shall be in substantially the form set forth in Exhibit B hereto.

         Each Series U Note shall be dated the date of authentication thereof
and shall bear interest from the date of original issuance thereof or from the
most recent Interest Payment Date to which interest has been paid or duly
provided for.

         SECTION 102. Definitions. The following defined terms used herein
shall, unless the context otherwise requires, have the meanings specified below.
Capitalized terms used herein for which no definition is provided herein shall
have the meanings set forth in the Original Indenture.

         "Interest Payment Dates" means February 15 and August 15 of each year,
commencing August 15, 2003.

         "Original Issue Date" means February 19, 2003.

         "Regular Record Date" means, with respect to each Interest Payment
Date, the close of business on the 15th calendar day preceding such Interest
Payment Date (whether or not a Business Day).

         "Stated Maturity" means February 15, 2006.

         SECTION 103. Payment of Principal and Interest. The principal of the
Series U Notes shall be due at Stated Maturity. The unpaid principal amount of
the Series U Notes shall bear interest at the rate of 2.65% per annum until paid
or duly provided for. Interest shall be paid semiannually in arrears on each
Interest Payment Date to the Person in whose name the Series U Notes are
registered on the Regular Record Date for such Interest Payment Date, provided
that interest payable at the Stated Maturity of principal will be paid to the
Person to whom principal is payable. Any such interest that is not so punctually
paid or duly provided for will forthwith cease to be payable to the Holders on
such Regular Record Date and may either be paid to the Person or Persons in
whose name the Series U Notes are 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 the Series U Notes not
less than ten (10) days prior to such Special Record Date, or be paid at any
time in any other lawful manner not inconsistent with the requirements of any
securities exchange, if any, on which the Series U Notes shall be listed, and
upon such notice as may be required by any such exchange, all as more fully
provided in the Original Indenture.

         Payments of interest on the Series U Notes will include interest
accrued to but excluding the respective Interest Payment Dates. Interest
payments for the Series U Notes shall be computed and paid on the basis of a
360-day year of twelve 30-day months. In the event that any date on which
interest is payable on the Series U Notes is not a Business Day, then payment of
the interest payable on such date will be made on the next succeeding day that
is a Business Day (and without any interest or other payment in respect of any
such delay), with the same force and effect as if made on the date the payment
was originally payable.

         Payment of the principal and interest due at the Stated Maturity of the
Series U Notes shall be made upon surrender of the Series U Notes at the
Corporate Trust Office of the Trustee. The principal of and interest on the
Series U Notes shall be paid in 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. Payments of interest (including interest on any Interest Payment
Date) will be made, subject to such surrender where applicable, at the option of
the Company, (i) by check mailed to the address of the Person entitled thereto
as such address shall appear in the Security Register or (ii) by wire transfer
or other electronic transfer at such place and to such account at a banking
institution in the United States as may be designated in writing to the Trustee
at least sixteen (16) days prior to the date for payment by the Person entitled
thereto.

         SECTION 104. Denominations. The Series U Notes may be issued in the
denominations of $1,000, or any integral multiple thereof.

         SECTION 105. Global Securities. The Series U Notes will be issued in
the form of one or more Global Securities registered in the name of the
Depositary (which shall be The Depository Trust Company) or its nominee. Except
under the limited circumstances described below, Series U Notes represented by
the Global Security will not be exchangeable for, and will not otherwise be
issuable as, Series U Notes in definitive form. The Global Securities described
above may not be transferred except by the Depositary to a nominee of the
Depositary or by a nominee of the Depositary to the Depositary or another
nominee of the Depositary or to a successor Depositary or its nominee.

         Owners of beneficial interests in such a Global Security will not be
considered the Holders thereof for any purpose under the Indenture, and no
Global Security representing a Series U Note shall be exchangeable, except for
another Global Security of like denomination and tenor to be registered in the
name of the Depositary or its nominee or to a successor Depositary or its
nominee. The rights of Holders of such Global Security shall be exercised only
through the Depositary.

         A Global Security shall be exchangeable for Series U Notes registered
in the names of persons other than the Depositary or its nominee only if (i) the
Depositary notifies the Company that it is unwilling or unable to continue as a
Depositary for such Global Security and no successor Depositary shall have been
appointed by the Company, or if at any time the Depositary ceases to be a
clearing agency registered under the Securities Exchange Act of 1934, as
amended, at a time when the Depositary is required to be so registered to act as
such Depositary and no successor Depositary shall have been appointed by the
Company, in each case within 90 days after the Company receives such notice or
becomes aware of such cessation, (ii) the Company in its sole discretion
determines that such Global Security shall be so exchangeable, or (iii) there
shall have occurred an Event of Default with respect to the Series U Notes. Any
Global Security that is exchangeable pursuant to the preceding sentence shall be
exchangeable for Series U Notes registered in such names as the Depositary shall
direct.

         SECTION 106. Transfer. No service charge will be made for any transfer
or exchange of Series U Notes, but payment will be required of a sum sufficient
to cover any tax or other governmental charge that may be imposed in connection
therewith.


         SECTION 107. Redemption at the Company's Option. The Series U Notes
will not be redeemable at the option of the Company prior to the Stated
Maturity.

         The Series U Notes will not have a sinking fund.


                        ARTICLE 2Miscellaneous Provisions

         SECTION 201. Recitals by Company. The recitals in this Twenty-First
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 of Series U Notes and of this Twenty-First Supplemental
Indenture as fully and with like effect as if set forth herein in full.

         SECTION 202. Ratification and Incorporation of Original Indenture. As
heretofore supplemented and as supplemented hereby, the Original Indenture is in
all respects ratified and confirmed, and the Original Indenture, the First
Supplemental Indenture, the Second Supplemental Indenture, the Third
Supplemental Indenture, the Fourth Supplemental Indenture, the Fifth
Supplemental Indenture, the Sixth Supplemental Indenture, the Seventh
Supplemental Indenture, the Eighth Supplemental Indenture, the Ninth
Supplemental Indenture, the Tenth Supplemental Indenture, the Eleventh
Supplemental Indenture, the Twelfth Supplemental Indenture, the Thirteenth
Supplemental Indenture, the Fourteenth Supplemental Indenture, the Fifteenth
Supplemental Indenture, the Sixteenth Supplemental Indenture, the Seventeenth
Supplemental Indenture, the Eighteenth Supplemental Indenture, the Nineteenth
Supplemental Indenture, the Twentieth Supplemental Indenture and this
Twenty-First Supplemental Indenture shall be read, taken and construed as one
and the same instrument.

         SECTION 203. Executed in Counterparts. This Twenty-First Supplemental
Indenture may be simultaneously executed in several counterparts, each of which
shall be deemed to be an original, and such counterparts shall together
constitute but one and the same instrument.



<PAGE>




                  IN WITNESS WHEREOF, each party hereto has caused this
instrument to be signed in its name and behalf by its duly authorized officers,
all as of the day and year first above written.



ATTEST:                                              ALABAMA POWER COMPANY







By:                                       By:
   --------------------------------          ----------------------------------
         Assistant Secretary                 William E. Zales, Jr.
                                             Vice President, Corporate
                                             Secretary and Assistant Treasurer




ATTEST:                                     JPMORGAN CHASE BANK, as Trustee



By:                                         By:
   -----------------------------
            Trust Officer                         Vice President


                                    EXHIBIT A

                              FORM OF SERIES U NOTE





NO. __ CUSIP NO. 010392ED6



                              ALABAMA POWER COMPANY

                           SERIES U 2.65% SENIOR NOTE

                              DUE FEBRUARY 15, 2006





  Principal Amount:           $__________________
  Regular Record Date:        15th  calendar day prior to Interest Payment
                              Date  (whether or not a
                              Business Day)
  Original Issue Date:        February 19, 2003
  Stated Maturity:            February 15, 2006
  Interest Payment Dates:     February 15 and August 15
  Interest Rate:              2.65%
  Authorized Denomination:    $1,000 or any integral multiple thereof


         Alabama Power Company, an Alabama corporation (the "Company", which
term includes any successor corporation under the Indenture referred to on the
reverse hereof), for value received, hereby promises to pay to
_______________________________________________, or registered assigns, the
principal sum of _____________________________________________ DOLLARS
($______________) on the Stated Maturity shown above, and to pay interest
thereon from the Original Issue Date shown above, or from the most recent
Interest Payment Date to which interest has been paid or duly provided for,
semiannually in arrears on each Interest Payment Date as specified above,
commencing on August 15, 2003, and on the Stated Maturity at the rate per annum
shown above until the principal hereof is paid or made available for payment and
on any overdue principal and on any overdue installment of interest. The
interest so payable, and punctually paid or duly provided for, on any Interest
Payment Date (other than an Interest Payment Date that is the Stated Maturity)
will, as provided in such Indenture, be paid to the Person in whose name this
Note (the "Note") is registered at the close of business on the Regular Record
Date as specified above next preceding such Interest Payment Date, provided that
any interest payable at the Stated Maturity will be paid to the Person to whom
principal is payable. Except as otherwise provided in the Indenture, 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 Note 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 Notes of this series
not less than 10 days prior to such Special Record Date, or be paid at any time
in any other lawful manner not inconsistent with the requirements of any
securities exchange, if any, on which the Notes of this series shall be listed,
and upon such notice as may be required by any such exchange, all as more fully
provided in the Indenture.

         Payments of interest on this Note will include interest accrued to but
excluding the respective Interest Payment Dates. Interest payments for this Note
shall be computed and paid on the basis of a 360-day year of twelve 30-day
months. In the event that any Interest Payment Date would otherwise be a day
that is not a Business Day, then payment of the interest payable on such date
will be made on the next succeeding day that is a Business Day (and without any
interest or other payment in respect of any such delay), with the same force and
effect as if made on the date the payment was originally payable. A "Business
Day" shall mean any day other than a Saturday or a Sunday or a day on which
banking institutions in New York City are authorized or required by law or
executive order to remain closed or a day on which the Corporate Trust Office of
the Trustee is closed for business.

         Payment of the principal of and interest due at the Stated Maturity of
the Series U Notes shall be made upon surrender of the Series U Notes at the
Corporate Trust Office of the Trustee. The principal of and interest on the
Series U Notes shall be paid in 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. Payment of interest (including interest on an Interest Payment
Date) will be made, subject to such surrender where applicable, at the option of
the Company, (i) by check mailed to the address of the Person entitled thereto
as such address shall appear in the Security Register or (ii) by wire transfer
or other electronic transfer at such place and to such account at a banking
institution in the United States as may be designated in writing to the Trustee
at least 16 days prior to the date for payment by the Person entitled thereto.

         REFERENCE IS HEREBY MADE TO THE FURTHER PROVISIONS OF THIS NOTE 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 by manual signature, this Note shall not be entitled to any benefit
under the Indenture or be valid or obligatory for any purpose.





<PAGE>


         IN WITNESS WHEREOF, the Company has caused this instrument to be duly
executed under its corporate seal.

Dated:


                                                     ALABAMA POWER COMPANY



                                                     By:
                                                         Vice President

Attest:



Assistant Secretary



                  {Seal of ALABAMA POWER COMPANY appears here}







<PAGE>





                          CERTIFICATE OF AUTHENTICATION



         This is one of the Senior Notes referred to in the within-mentioned
Indenture.



                                   JPMORGAN CHASE BANK,
                                   as Trustee





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












<PAGE>




                             (Reverse Side of Note)



         This Note is one of a duly authorized issue of Senior Notes of the
Company (the "Notes"), issued and issuable in one or more series under a Senior
Note Indenture, dated as of December 1, 1997, as supplemented (the "Indenture"),
between the Company and JPMorgan Chase Bank (formerly known as The Chase
Manhattan Bank), Trustee (the "Trustee," which term includes any successor
trustee under the Indenture), to which Indenture and all indentures incidental
thereto reference is hereby made for a statement of the respective rights,
limitation of rights, duties and immunities thereunder of the Company, the
Trustee and the Holders of the Notes issued thereunder and of the terms upon
which said Notes are, and are to be, authenticated and delivered. This Note is
one of the series designated on the face hereof as Series U 2.65% Senior Notes
due February 15, 2006 (the "Series U Notes") which is unlimited in aggregate
principal amount. Capitalized terms used herein for which no definition is
provided herein shall have the meanings set forth in the Indenture.



         The Series U Senior Notes will not be redeemable at the option of the
Company prior to the Stated Maturity.

         The Series U Notes will not have a sinking fund.

         If an Event of Default with respect to the Notes of this series shall
occur and be continuing, the principal of the Notes of this series may be
declared due and payable in the manner, with the effect and subject to the
conditions provided in the Indenture.

         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 the Notes of each series to be affected
under the Indenture at any time by the Company and the Trustee with the consent
of the Holders of not less than a majority in principal amount of the Notes at
the time Outstanding of each series to be affected. The Indenture also contains
provisions permitting the Holders of specified percentages in principal amount
of the Notes of each series at the time Outstanding, on behalf of the Holders of
all Notes of such series, 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 Note shall
be conclusive and binding upon such Holder and upon all future Holders of this
Note and of any Note issued upon the registration of transfer hereof or in
exchange hereof or in lieu hereof, whether or not notation of such consent or
waiver is made upon this Note.

         No reference herein to the Indenture and no provision of this Note or
of the Indenture shall alter or impair the obligation of the Company, which is
absolute and unconditional, to pay the principal of and interest on this Note at
the times, place and rate, 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 Note is registerable in the Security Register,
upon surrender of this Note for registration of transfer at the office or agency
of the Company for such purpose, duly endorsed by, or accompanied by a written
instrument of transfer in form satisfactory to the Company and the Security
Registrar and duly executed by, the Holder hereof or his attorney duly
authorized in writing, and thereupon one or more new Notes of this series, of
authorized denominations and of like tenor and for the same aggregate principal
amount, will be issued to the designated transferee or transferees. 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 Note 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 Note is registered as the owner hereof for all
purposes, whether or not this Note be overdue, and neither the Company, the
Trustee nor any such agent shall be affected by notice to the contrary.

         The Notes of this series 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,
Notes of this series are exchangeable for a like aggregate principal amount of
Notes of this series of a different authorized denomination, as requested by the
Holder surrendering the same upon surrender of the Note or Notes to be exchanged
at the office or agency of the Company.

         This Note shall be governed by, and construed in accordance with, the
internal laws of the State of New York.



<PAGE>


                                  ABBREVIATIONS

The following abbreviations, when used in the inscription on the face of this
instrument, shall be construed as though they were written out in full according
to applicable laws or regulations:





TEN COM- as tenants in           UNIF GIFT MIN ACT- _______ Custodian ________
          common                              (Cust)                    (Minor)

TEN ENT- as tenants by the
         entireties                                   under Uniform Gifts to
                                                      Minors Act
 JT TEN- as joint tenants
         with right of
         survivorship and                           ________________________
         not as tenants                                          (State)
        in common



<PAGE>


                    Additional abbreviations may also be used
                          though not on the above list.
         FOR VALUE RECEIVED, the undersigned hereby sell(s) and transfer(s) unto

(please insert Social Security or other identifying number of assignee)

PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING POSTAL ZIP CODE OF
ASSIGNEE

the within Note and all rights thereunder, hereby irrevocably constituting and
appointing agent to transfer said Note on the books of the Company, with full
power of substitution in the premises.

Dated:
       --------------------         -----------------------------------------



NOTICE: The signature to this assignment must correspond with the name as
written upon the face of the within instrument in every particular without
alteration or enlargement, or any change whatever.



<PAGE>




                                    EXHIBIT B



                          CERTIFICATE OF AUTHENTICATION



         This is one of the Senior Notes referred to in the within-mentioned
Indenture.



                                                     JPMORGAN CHASE BANK,

                                                     as Trustee





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