Document:

<PAGE>

                                                                   EXHIBIT 10.24

                      ENERGY AND CAPACITY SALES AGREEMENT

     THIS ENERGY AND CAPACITY SALES AGREEMENT (this "Agreement"), dated as of
                                                     ---------
August 1, 2001 (the "Effective Date"), is by and between MIRANT CHALK POINT, LLC
                     --------------
(formerly known as Southern Energy Chalk Point, LLC), a Delaware limited
liability company ("Seller"), and MIRANT AMERICAS ENERGY MARKETING, LP (formerly
                    ------
known as Southern Company Energy Marketing L.P.), a Delaware limited partnership
("Buyer").  Seller and Buyer are referred to individually as a "Party" and
  -----                                                         -----
collectively as the "Parties."
                     -------

                              W I T N E S S E T H:

     WHEREAS, Seller owns certain electric generation facilities and associated
facilities located in Prince George's County, Maryland (the "Generating
                                                             ----------
Station"); and

     WHEREAS, Buyer is engaged in the sale and purchase of electric energy,
capacity and other products; and

     WHEREAS, Seller and Buyer are parties to that certain Master Power Purchase
and Sale Agreement, dated as of December 18, 2000 (the "Master Agreement"),
                                                        ----------------
pursuant to which Seller and Buyer may make sales of capacity, energy and other
products to each other; and

     WHEREAS, Seller and Buyer are parties to that certain Amended and Restated
Services and Risk Management Agreement dated March 30, 2001 (the "Services
                                                                  --------
Agreement"), pursuant to which Buyer provides certain services to Seller,
---------
including bidding and dispatch services; and

     WHEREAS, the Parties desire to enter into this Agreement for the sale and
purchase of Products, as hereinafter defined, from the Generating Station; and

     WHEREAS, Mirant Mid-Atlantic, LLC, Mirant Peaker, LLC, and Mirant Potomac
River, LLC (collectively, the "Other Generating Companies"), are entering into
                               --------------------------
Energy and Capacity Sales Agreements with Buyer concurrently with Seller and
Buyer entering into this Agreement on substantially similar terms and
conditions;

     NOW, THEREFORE, in consideration of the foregoing premises and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Seller and Buyer hereby agree as follows:

     1.  Definitions.  Unless otherwise defined herein, capitalized terms shall
         -----------
have the meaning set forth in the Master Agreement.  The following terms shall
have the meanings set forth below:

     "Agreement" means this Agreement.
<PAGE>

     "Availability Shortfall Payment" has the meaning set forth in Section 6 of
this Agreement.

     "Capacity Payment" has the meaning set forth in Section 5 of this
Agreement.

     "Committed Capacity" means the amount of the Unit Capacity designated as
Committed Capacity in accordance with Section 4, as adjusted from time to time
in accordance with Section 10.

     "Committed Energy" has the meaning set forth in Section 7 of this
Agreement.

     "Committed Energy Payment" has the meaning set forth in Section 7 of this
Agreement.

     "Committed Percentage" means for any Contract Year, the Committed Capacity
for such Contract Year divided by the Unit Capacity.

     "Committed Products" means the Committed Capacity and all Committed Energy,
ancillary services or other products commercially recognized in the PJM market
(or any successor market) associated with the Committed Capacity.

     "Contract Year" means Contract Year 1, Contract Year 2, Contract Year 3 or
Contract Year 4, as the case may be.

     "Contract Year 1" means the period between the Effective Date through and
including December 31, 2001.

     "Contract Year 2" means the period between January 1, 2002, through and
including December 31, 2002.

     "Contract Year 3" means the period between January 1, 2003, through and
including December 31, 2003.

     "Contract Year 4" means the period between January 1, 2004, through and
including June 30, 2004.

     "Delivery Point" means the high side of the step-up transformer for each
Unit.

     "Effective Date" has the meaning set forth in the Preamble to this
Agreement.

     "Equivalent Availability Factor" or "EAF" means the equivalent availability
factor for the Portfolio Units, computed in accordance with North American
Electric Reliability Council definitions at the end of each month on a rolling
12 month basis; provided, however, that for Contract Year 1, the EAF will be
                --------  -------
computed based on availability commencing January 1, 2001.

                                       2
<PAGE>

     "Extension Notice" has the meaning set forth in Section 2 of this
Agreement.

     "Extension Term" means the period between July 1, 2004, and December 31,
2004.

     "Generating Companies" has the meaning set forth in the Recitals to this
Agreement.

     "Generating Station" has the meaning set forth in the Recitals to this
Agreement.

     "Material Portfolio Unit" means the generating units of Seller and the
Other Generating Companies listed as Material Portfolio Units on Exhibit A,
                                                                 ---------
attached hereto.

     "Master Agreement" has the meaning set forth in the Recitals to this
Agreement.

     "Other Generating Companies" has the meaning set forth in the Recitals to
this Agreement.

     "Other Sales Agreement" means each of the Energy and Capacity Sales
Agreements of even date herewith between Buyer and the Other Generating
Companies, respectively.

     "Portfolio Units" means the generating units of Seller and the Other
Generating Companies, as listed on Exhibit A.

     "Products" means all Committed Products and all Uncommitted Products.

     "Services Agreement" has the meaning set forth in the Recitals to this
Agreement.

     "Term" has the meaning set forth in Section 2 of this Agreement.

     "Uncommitted Capacity" means the amount of Unit Capacity which is not
designated as Committed Capacity under the terms of this Agreement.

     "Uncommitted Energy" has the meaning set forth in Section 7 of this
Agreement.

     "Uncommitted Products" means the Uncommitted Capacity and all Uncommitted
Energy, ancillary services or other products commercially recognized in the PJM
market (or any successor market) associated with the Uncommitted Capacity.

     "Unit" means each of the generating units at the Generating Station.

     "Unit Capacity" means the aggregate capacity of the Units as listed on
Exhibit A attached hereto.
---------

     2.  Term.  The term of this Agreement (the "Term") shall commence on the
         ----                                    ----
Effective Date and end on June 30, 2004, unless earlier terminated in accordance
with the terms of this Agreement.  Buyer shall have the right to extend the Term
for the Extension Term by giving

                                       3
<PAGE>

Seller written notice of such extension (the "Extension Notice") on or before
                                              ----------------
April 1, 2004. The applicable provisions of this Agreement shall continue in
effect after cancellation or termination hereof to the extent necessary to
provide for final billings, billing adjustments and payments pertaining to
liability and indemnification obligations arising from acts or events that
occurred while this Agreement, including the Extension Term, if applicable, was
in effect.

     3.  Products.  Seller shall deliver or make available to Buyer all
         --------
Committed and Uncommitted Products produced or available from the Generating
Station and delivered by Seller to Buyer pursuant to and during the Term
(including the Extension Term, if applicable) of this Agreement.

     4.  Committed Capacity and Uncommitted Capacity.  Seller shall make
         -------------------------------------------
available to Buyer all of the Unit Capacity of Seller's Units, and for purposes
of this Agreement such capacity shall be either Committed Capacity or
Uncommitted Capacity.  For Contract Year 1 all Unit Capacity shall be Committed
Capacity.  On or before November 15 of Contract Year, Buyer shall have the
option to designate the amount of Committed Capacity for the next Contract Year;
provided, however, for Contract Year 2 the Committed Capacity shall not be less
--------  -------
than 75% of the Unit Capacity.  The Committed Capacity may not be increased by
Buyer for any Contract Year without the written approval of Seller and Buyer.
If Buyer exercises its right for the Extension Term, Buyer shall designate the
amount of Committed Capacity in its notice of exercise for the Extension Term.

     5.  Capacity Payments.  Each month during the Term, Buyer shall pay Seller
         -----------------
a capacity payment (the "Capacity Payment") for the Committed Capacity
                         ----------------
calculated as follows:

     Capacity Payment = Committed Capacity x Capacity Rate
<TABLE>
<CAPTION>

          Where:
          Capacity Rate          Year
          -------------          ----
          <S>                    <C>
          $11,825/MW-mo          Contract Year 1
          $12,120/MW-mo          Contract Year 2
          $11,285/MW-mo          Contract Year 3
          $10,400/MW-mo          Contract Year 4
          $10,400/MW-mo          Extension Term
</TABLE>

     6.  Availability Shortfall Payment.  In the event the EAF during any month
         ------------------------------
is less than 75%, then Seller shall pay Buyer an amount (the "Availability
                                                              ------------
Shortfall Payment") calculated as follows:
-----------------

Availability Shortfall Payment = [(0.75 - EAF)/0.75] x Committed Capacity x
Capacity Rate

     7.  Payments for Committed Energy.  As used herein "Committed Energy" is
         -----------------------------                   ----------------
the energy delivered to the Delivery Point multiplied by the Committed
Percentage, and all other energy delivered to the Delivery Point is referred to
as the "Uncommitted Energy." Buyer shall pay Seller for all Committed Energy
        ------------------
delivered to the Delivery Point (such payment, the

                                       4
<PAGE>

"Committed Energy Payment") as follows:
 ------------------------

     Committed Energy Payment = Committed Energy x Energy Price

         Where:
         Year                    Energy Price
         ----                    ------------
         Contract Year 1         $16.50/MWh
         Contract Year 2         $17.15/MWh
         Contract Year 3         $17.75/MWh
         Contract Year 4         $18.80/MWh
         Extension Term          $18.80/MWh

     8.  Payments for Uncommitted Capacity and Uncommitted Energy.  Unless
         --------------------------------------------------------
otherwise agreed to by Seller and Buyer, Buyer shall pay Seller the market price
for all products associated with the Uncommitted Products.

     9.  Payment Date.  Payments made by Buyer to Seller under this Agreement
         ------------
shall be made on or before the 20th of each month for Products delivered in the
prior month.  Buyer may setoff any amounts due from Seller for Availability
Shortfall Payments.

     10.  Material Unplanned Outage.  In the event of an unplanned outage or
          -------------------------
derating of any Unit of Seller which is expected to last at least 30 consecutive
days:

     (a)  Buyer may upon written notice to Seller reduce the Committed Capacity
     by the amount of the outage or derated capacity of the Unit, and during the
     term of the unplanned outage such capacity of the Unit shall not be
     included in the calculation of the Equivalent Availability Factor.  Upon
     restoration of the Unit to service, Buyer may designate such amount of the
     Unit's capacity as either Committed Capacity or Uncommitted Capacity.

     (b)  If the Unit is a Material Portfolio Unit, Buyer may terminate this
     agreement upon written notice to Seller.

Seller shall give Buyer written notice of the occurrence of the unplanned outage
of the Unit promptly upon determining that the outage is expected to last at
least 30 days, and Buyer shall have 30 days after receiving such notice to
exercise its rights under Section 10(a) or 10(b).

     11.  Termination.  In addition to the termination rights in the Master
          -----------
Agreement, this Agreement shall terminate upon the termination of any of the
Other Sales Agreements.

     12.  Cross Default.  An Event of Default by Buyer under any of the Other
          -------------
Sales Agreements shall be an Event of Default by Buyer under this Agreement.  An
Event of Default by any of the Other Generating Companies under the Other Sales
Agreements shall be an Event of Default by Seller under this Agreement.

                                       5
<PAGE>

     13.  Confirmation Under Master Agreement.  This Agreement is a
          -----------------------------------
"Confirmation" under the terms of the Master Agreement.  For purposes of the
Master Agreement, the "Quantity" shall mean the amounts of Products delivered
hereunder, the "Contract Price" shall mean the amounts payable under Sections 5,
6, 7 and 8 of this Agreement, and the "Delivery Period" shall mean the Term.
Any scheduling of Products shall be conducted by Buyer pursuant to the Services
Agreement.

     14.  Entire Agreement.  That certain Confirmation of Power Sale Transaction
          ----------------
dated March 30, 2001, is hereby terminated.  This Agreement, the Master
Agreement and the Services Agreement embody the entire agreement and
understanding of the Parties in respect of the transactions contemplated by this
Agreement.  This Agreement shall constitute a Confirmation of Power Sale
Transaction for purposes of the Master Agreement.

     IN WITNESS WHEREOF, this Agreement has been duly executed and delivered by
the Parties as of the date first written above.

MIRANT CHALK POINT, LLC                    MIRANT AMERICAS ENERGY MARKETING, LP

                                           By MIRANT AMERICAS DEVELOPMENT, INC.,
                                           its General Partner

By:                                        By:
      --------------------------------           -------------------------------
Name:                                      Name:
Title:                                     Title:

                                       6
<PAGE>

                                   EXHIBIT A
<TABLE>
<CAPTION>

Generating Station              Unit         Capacity    Material Portfolio Unit
--------------------------      ----         --------    -----------------------
<S>                             <C>          <C>         <C>

Mirant Mid-Atlantic, LLC

    Dickerson                   D1           182                   Yes
    Dickerson                   D2           182                   Yes
    Dickerson                   D3           182                   Yes
    Dickerson                   DCT1          13
    Dickerson                   HCT1         147
    Dickerson                   HCT2         147

    Morgantown                  F1           624                   Yes
    Morgantown                  F2           620                   Yes
    Morgantown                  FCT1          16
    Morgantown                  FCT2          16
    Morgantown                  FCT3          54
    Morgantown                  FCT4          54
    Morgantown                  FCT5          54
    Morgantown                  FCT6          54

Mirant Chalk Point, LLC

    Chalk Point                 E1           341                   Yes
    Chalk Point                 E2           342                   Yes
    Chalk Point                 E3           612                   Yes
    Chalk Point                 E4           612                   Yes

Mirant Peaker, LLC

    Chalk Point                 ECT1          18
    Chalk Point                 ECT2          30
    Chalk Point                 ECT3          86
    Chalk Point                 ECT4          86
    Chalk Point                 ECT5         109
    Chalk Point                 ECT6         109

    SMECO                       CT1           84
</TABLE>

                                       7
<PAGE>

<TABLE>
<CAPTION>

Generating Station              Unit         Capacity    Material Portfolio Unit
--------------------------      ----         --------    -----------------------
<S>                             <C>          <C>         <C>

Mirant Potomac River, LLC

    Potomac River                C1            88
    Potomac River                C2            88
    Potomac River                C3           102
    Potomac River                C4           102
    Potomac River                C5           102
</TABLE>

                                       8<PAGE>

                                                                   EXHIBIT 10.25

                      ENERGY AND CAPACITY SALES AGREEMENT

     THIS ENERGY AND CAPACITY SALES AGREEMENT (this "Agreement"), dated as of
                                                     ---------
August 1, 2001 (the "Effective Date"), is by and between MIRANT PEAKER, LLC
                     --------------
(formerly known as Southern Energy Peaker, LLC), a Delaware limited liability
company ("Seller"), and MIRANT AMERICAS ENERGY MARKETING, LP (formerly known as
          ------
Southern Company Energy Marketing L.P.), a Delaware limited partnership
("Buyer").  Seller and Buyer are referred to individually as a "Party" and
  -----                                                         -----
collectively as the "Parties."
                     -------

                              W I T N E S S E T H:

     WHEREAS, Seller owns or leases certain electric generation facilities and
associated facilities located in Prince George's County, Maryland (the
"Generating Station"); and
-------------------

     WHEREAS, Buyer is engaged in the sale and purchase of electric energy,
capacity and other products; and

     WHEREAS, Seller and Buyer are parties to that certain Master Power Purchase
and Sale Agreement, dated as of December 18, 2000 (the "Master Agreement"),
                                                        ----------------
pursuant to which Seller and Buyer may make sales of capacity, energy and other
products to each other; and

     WHEREAS, Seller and Buyer are parties to that certain Amended and Restated
Services and Risk Management Agreement dated March 30, 2001 (the "Services
                                                                  --------
Agreement"), pursuant to which Buyer provides certain services to Seller,
---------
including bidding and dispatch services; and

     WHEREAS, the Parties desire to enter into this Agreement for the sale and
purchase of Products, as hereinafter defined, from the Generating Station; and

     WHEREAS, Mirant Chalk Point, LLC, Mirant Mid-Atlantic, LLC, and Mirant
Potomac River, LLC (collectively, the "Other Generating Companies"), are
                                       --------------------------
entering into Energy and Capacity Sales Agreements with Buyer concurrently with
Seller and Buyer entering into this Agreement on substantially similar terms and
conditions;

     NOW, THEREFORE, in consideration of the foregoing premises and for other
good and valuable consideration, the receipt and sufficiency of which are hereby
acknowledged, Seller and Buyer hereby agree as follows:

     1.  Definitions.  Unless otherwise defined herein, capitalized terms shall
         -----------
have the meaning set forth in the Master Agreement.  The following terms shall
have the meanings set forth below:

     "Agreement" means this Agreement.
<PAGE>

     "Availability Shortfall Payment" has the meaning set forth in Section 6 of
this Agreement.

     "Capacity Payment" has the meaning set forth in Section 5 of this
Agreement.

     "Committed Capacity" means the amount of the Unit Capacity designated as
Committed Capacity in accordance with Section 4, as adjusted from time to time
in accordance with Section 10.

     "Committed Energy" has the meaning set forth in Section 7 of this
Agreement.

     "Committed Energy Payment" has the meaning set forth in Section 7 of this
Agreement.

     "Committed Percentage" means for any Contract Year, the Committed Capacity
for such Contract Year divided by the Unit Capacity.

     "Committed Products" means the Committed Capacity and all Committed Energy,
ancillary services or other products commercially recognized in the PJM market
(or any successor market) associated with the Committed Capacity.

     "Contract Year" means Contract Year 1, Contract Year 2, Contract Year 3 or
Contract Year 4, as the case may be.

     "Contract Year 1" means the period between the Effective Date through and
including December 31, 2001.

     "Contract Year 2" means the period between January 1, 2002, through and
including December 31, 2002.

     "Contract Year 3" means the period between January 1, 2003, through and
including December 31, 2003.

     "Contract Year 4" means the period between January 1, 2004, through and
including June 30, 2004.

     "Delivery Point" means the high side of the step-up transformer for each
Unit.

     "Effective Date" has the meaning set forth in the Preamble to this
Agreement.

     "Equivalent Availability Factor" or "EAF" means the equivalent availability
factor for the Portfolio Units, computed in accordance with North American
Electric Reliability Council definitions at the end of each month on a rolling
12 month basis; provided, however, that for Contract Year 1, the EAF will be
                --------  -------
computed based on availability commencing January 1, 2001.

                                       2

<PAGE>

     "Extension Notice" has the meaning set forth in Section 2 of this
Agreement.

     "Extension Term" means the period between July 1, 2004, and December 31,
2004.

     "Generating Companies" has the meaning set forth in the Recitals to this
Agreement.

     "Generating Station" has the meaning set forth in the Recitals to this
Agreement.

     "Material Portfolio Unit" means the generating units of Seller and the
Other Generating Companies listed as Material Portfolio Units on Exhibit A,
                                                                 ---------
attached hereto.

     "Master Agreement" has the meaning set forth in the Recitals to this
Agreement.

     "Other Generating Companies" has the meaning set forth in the Recitals to
this Agreement.

     "Other Sales Agreement" means each of the Energy and Capacity Sales
Agreements of even date herewith between Buyer and the Other Generating
Companies, respectively.

     "Portfolio Units" means the generating units of Seller and the Other
Generating Companies, as listed on Exhibit A.

     "Products" means all Committed Products and all Uncommitted Products.

     "Services Agreement" has the meaning set forth in the Recitals to this
Agreement.

     "Term" has the meaning set forth in Section 2 of this Agreement.

     "Uncommitted Capacity" means the amount of Unit Capacity which is not
designated as Committed Capacity under the terms of this Agreement.

     "Uncommitted Energy" has the meaning set forth in Section 7 of this
Agreement.

     "Uncommitted Products" means the Uncommitted Capacity and all Uncommitted
Energy, ancillary services or other products commercially recognized in the PJM
market (or any successor market) associated with the Uncommitted Capacity.

     "Unit" means each of the generating units at the Generating Station.

     "Unit Capacity" means the aggregate capacity of the Units as listed on

Exhibit A attached hereto.
---------

     2.  Term.  The term of this Agreement (the "Term") shall commence on the
         ----                                    ----
Effective Date and end on June 30, 2004, unless earlier terminated in accordance
with the terms of this Agreement.  Buyer shall have the right to extend the Term
for the Extension Term by giving

                                       3

<PAGE>

Seller written notice of such extension (the "Extension Notice") on or before
                                              ----------------
April 1, 2004. The applicable provisions of this Agreement shall continue in
effect after cancellation or termination hereof to the extent necessary to
provide for final billings, billing adjustments and payments pertaining to
liability and indemnification obligations arising from acts or events that
occurred while this Agreement, including the Extension Term, if applicable, was
in effect.

     3.  Products.  Seller shall deliver or make available to Buyer all
         --------
Committed and Uncommitted Products produced or available from the Generating
Station and delivered by Seller to Buyer pursuant to and during the Term
(including the Extension Term, if applicable) of this Agreement.

     4.  Committed Capacity and Uncommitted Capacity.  Seller shall make
         -------------------------------------------
available to Buyer all of the Unit Capacity of Seller's Units, and for purposes
of this Agreement such capacity shall be either Committed Capacity or
Uncommitted Capacity.  For Contract Year 1 all Unit Capacity shall be Committed
Capacity.  On or before November 15 of Contract Year, Buyer shall have the
option to designate the amount of Committed Capacity for the next Contract Year;
provided, however, for Contract Year 2 the Committed Capacity shall not be less
--------  -------
than 75% of the Unit Capacity.  The Committed Capacity may not be increased by
Buyer for any Contract Year without the written approval of Seller and Buyer.
If Buyer exercises its right for the Extension Term, Buyer shall designate the
amount of Committed Capacity in its notice of exercise for the Extension Term.

     5.  Capacity Payments.  Each month during the Term, Buyer shall pay Seller
         -----------------
a capacity payment (the "Capacity Payment") for the Committed Capacity
                         ----------------
calculated as follows:

     Capacity Payment = Committed Capacity x Capacity Rate

         Where:
         Capacity Rate            Year
         -------------            ----
         $11,825/MW-mo            Contract Year 1
         $12,120/MW-mo            Contract Year 2
         $11,285/MW-mo            Contract Year 3
         $10,400/MW-mo            Contract Year 4
         $10,400/MW-mo            Extension Term

     6.  Availability Shortfall Payment.  In the event the EAF during any month
         ------------------------------
is less than 75%, then Seller shall pay Buyer an amount (the "Availability
                                                              ------------
Shortfall Payment") calculated as follows:
-----------------

Availability Shortfall Payment = [(0.75 - EAF)/0.75] x Committed Capacity x
Capacity Rate

     7.  Payments for Committed Energy.  As used herein "Committed Energy" is
         -----------------------------                   ----------------
the energy delivered to the Delivery Point multiplied by the Committed
Percentage, and all other energy delivered to the Delivery Point is referred to
as the "Uncommitted Energy." Buyer shall pay Seller for all Committed Energy
        ------------------
delivered to the Delivery Point (such payment, the

                                       4

<PAGE>

"Committed Energy Payment") as follows:
 ------------------------

     Committed Energy Payment = Committed Energy x Energy Price

         Where:
         Year                   Energy Price
         ----                   ------------
         Contract Year 1         $16.50/MWh
         Contract Year 2         $17.15/MWh
         Contract Year 3         $17.75/MWh
         Contract Year 4         $18.80/MWh
         Extension Term          $18.80/MWh

     8.  Payments for Uncommitted Capacity and Uncommitted Energy.  Unless
         --------------------------------------------------------
otherwise agreed to by Seller and Buyer, Buyer shall pay Seller the market price
for all products associated with the Uncommitted Products.

     9.  Payment Date.  Payments made by Buyer to Seller under this Agreement
         ------------
shall be made on or before the 20th of each month for Products delivered in the
prior month.  Buyer may setoff any amounts due from Seller for Availability
Shortfall Payments.

     10.  Material Unplanned Outage.  In the event of an unplanned outage or
          -------------------------
derating of any Unit of Seller which is expected to last at least 30 consecutive
days:

     (a)  Buyer may upon written notice to Seller reduce the Committed Capacity
     by the amount of the outage or derated capacity of the Unit, and during the
     term of the unplanned outage such capacity of the Unit shall not be
     included in the calculation of the Equivalent Availability Factor.  Upon
     restoration of the Unit to service, Buyer may designate such amount of the
     Unit's capacity as either Committed Capacity or Uncommitted Capacity.

     (b)  If the Unit is a Material Portfolio Unit, Buyer may terminate this
     agreement upon written notice to Seller.

Seller shall give Buyer written notice of the occurrence of the unplanned outage
of the Unit promptly upon determining that the outage is expected to last at
least 30 days, and Buyer shall have 30 days after receiving such notice to
exercise its rights under Section 10(a) or 10(b).

     11.  Termination.  In addition to the termination rights in the Master
          -----------
Agreement, this Agreement shall terminate upon the termination of any of the
Other Sales Agreements.

     12.  Cross Default.  An Event of Default by Buyer under any of the Other
          -------------
Sales Agreements shall be an Event of Default by Buyer under this Agreement.  An
Event of Default by any of the Other Generating Companies under the Other Sales
Agreements shall be an Event of Default by Seller under this Agreement.

                                       5

<PAGE>

     13.  Confirmation Under Master Agreement.  This Agreement is a
          -----------------------------------
"Confirmation" under the terms of the Master Agreement.  For purposes of the
Master Agreement, the "Quantity" shall mean the amounts of Products delivered
hereunder, the "Contract Price" shall mean the amounts payable under Sections 5,
6, 7 and 8 of this Agreement, and the "Delivery Period" shall mean the Term.
Any scheduling of Products shall be conducted by Buyer pursuant to the Services
Agreement.

     14.  Entire Agreement.  That certain Confirmation of Power Sale Transaction
          ----------------
dated March 30, 2001, is hereby terminated.  This Agreement, the Master
Agreement and the Services Agreement embody the entire agreement and
understanding of the Parties in respect of the transactions contemplated by this
Agreement.  This Agreement shall constitute a Confirmation of Power Sale
Transaction for purposes of the Master Agreement.

     IN WITNESS WHEREOF, this Agreement has been duly executed and delivered by
the Parties as of the date first written above.

MIRANT PEAKER, LLC                        MIRANT AMERICAS ENERGY
                                          MARKETING, LP

                                          By MIRANT AMERICAS
                                          DEVELOPMENT, INC.,
                                          its General Partner

By:                                          By:
   -----------------------------------          -------------------------------
Name:                                        Name:
Title:                                       Title:

                                       6

<PAGE>

                                   EXHIBIT A

Generating Station              Unit  Capacity  Material Portfolio Unit
------------------              ----  --------  -----------------------

Mirant Mid-Atlantic, LLC

    Dickerson                   D1      182                Yes
    Dickerson                   D2      182                Yes
    Dickerson                   D3      182                Yes
    Dickerson                   DCT1     13
    Dickerson                   HCT1    147
    Dickerson                   HCT2    147

    Morgantown                  F1      624                Yes
    Morgantown                  F2      620                Yes
    Morgantown                  FCT1     16
    Morgantown                  FCT2     16
    Morgantown                  FCT3     54
    Morgantown                  FCT4     54
    Morgantown                  FCT5     54
    Morgantown                  FCT6     54

  Mirant Chalk Point, LLC

    Chalk Point                 E1      341                Yes
    Chalk Point                 E2      342                Yes
    Chalk Point                 E3      612                Yes
    Chalk Point                 E4      612                Yes

  Mirant Peaker, LLC

    Chalk Point                 ECT1     18
    Chalk Point                 ECT2     30
    Chalk Point                 ECT3     86
    Chalk Point                 ECT4     86
    Chalk Point                 ECT5    109
    Chalk Point                 ECT6    109

    SMECO                       CT1      84

                                       7

<PAGE>

Mirant Potomac River, LLC

Potomac River                   C1       88
Potomac River                   C2       88
Potomac River                   C3      102
Potomac River                   C4      102
Potomac River                   C5      102

                                       8

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