Document:

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                                                                   EXHIBIT 10.13

                       RESTATED INTERCOMPANY NOTE: OSWEGO

$62,299,000                                                    February 22, 2000

                  FOR VALUE RECEIVED, OSWEGO HARBOR POWER LLC, a Delaware
limited liability company, (the "Borrower"), hereby promises to pay to the order
of NRG NORTHEAST GENERATING LLC, a Delaware limited liability company, its
successors and assigns (the "Lender"), on demand in lawful money of the United
States in immediately available funds, at the office of the Lender located at
1221 Nicollet Mall, Suite 700, Minneapolis, MN 55403, the principal sum of
SIXTY-TWO MILLION TWO HUNDRED NINETY-NINE THOUSAND DOLLARS ($62,299,000) or, if
less, the aggregate unpaid principal amount of the loan remaining outstanding
hereunder.

                  The Borrower also promises to pay as interest on the unpaid
principal amount hereof semi-annually on June 15 and December 15 of each year,
beginning on June 15, 2000 in like money at said office from the date hereof
until paid, an amount equal to eight and three tenths percent (8.3%) (its
"Proportionate Share") of the interest due in respect of certain bonds issued by
the Issuer pursuant to an indenture entered into by the Issuer, certain
guarantors thereto and the Chase Manhattan Bank, as trustee, of even date
herewith.

                  The Borrower may voluntarily prepay this Note, in whole or in
part provided, however, the Borrower may not prepay more than its Proportionate
Share of the principal amounts set forth in Schedule A hereto before the date
specified on such schedule without the prior written consent of the Lender. The
Lender shall record all such prepayments of principal, and the principal sum due
under this Note shall be reduced accordingly.

                  The Borrower hereby waives presentment, demand, protest or
notice of any kind in connection with this Note. All amounts payable under this
Note are payable without relief from valuation and appraisement laws.

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                  This Restated Intercompany Note shall be construed in
accordance with and be governed by the law of the State of New York.

                                            OSWEGO HARBOR POWER LLC

                                            By:   /s/ Brian B. Bird
                                                  ------------------------------
                                                  Name:  Brian B. Bird
                                                  Title: Treasurer

                                        2<PAGE>   1
                                                                   EXHIBIT 10.14

                      RESTATED INTERCOMPANY NOTE: SOMERSET

$34,800,000                                                    February 22, 2000

                  FOR VALUE RECEIVED, SOMERSET POWER LLC, a Delaware limited
liability company, (the "Borrower"), hereby promises to pay to the order of NRG
NORTHEAST GENERATING LLC, a Delaware limited liability company, its successors
and assigns (the "Lender"), on demand in lawful money of the United States in
immediately available funds, at the office of the Lender located at 1221
Nicollet Mall, Suite 700, Minneapolis, MN 55403, the principal sum of
THIRTY-FOUR MILLION EIGHT HUNDRED THOUSAND DOLLARS ($34,800,000) or, if less,
the aggregate unpaid principal amount of the loan remaining outstanding
hereunder.

                  The Borrower also promises to pay as interest on the unpaid
principal amount hereof semi-annually on June 15 and December 15 of each year,
beginning on June 15, 2000 in like money at said office from the date hereof
until paid, an amount equal to four and five tenths percent (4.5%) (its
"Proportionate Share") of the interest due in respect of certain bonds issued by
the Issuer pursuant to an indenture entered into by the Issuer, certain
guarantors thereto and the Chase Manhattan Bank, as trustee, of even date
herewith.

                  The Borrower may voluntarily prepay this Note, in whole or in
part provided, however, the Borrower may not prepay more than its Proportionate
Share of the principal amounts set forth in Schedule A hereto before the date
specified on such schedule without the prior written consent of the Lender. The
Lender shall record all such prepayments of principal, and the principal sum due
under this Note shall be reduced accordingly.

                  The Borrower hereby waives presentment, demand, protest or
notice of any kind in connection with this Note. All amounts payable under this
Note are payable without relief from valuation and appraisement laws.

<PAGE>   2

                  This Restated Intercompany Note shall be construed in
accordance with and be governed by the law of the State of New York.

                                            SOMERSET POWER LLC

                                            By:   /s/ Brian B. Bird
                                                  ------------------------------
                                                  Name:  Brian B. Bird
                                                  Title: Treasurer

                                        2<PAGE>   1
                                                                   EXHIBIT 10.15

                        WORKING CAPITAL INTERCOMPANY NOTE

$50,000,000                                                    February 22, 2000

                  FOR VALUE RECEIVED, ARTHUR KILL POWER LLC, ASTORIA GAS TURBINE
POWER LLC, CONNECTICUT JET POWER LLC, DEVON POWER LLC, DUNKIRK POWER LLC,
HUNTLEY POWER LLC, MIDDLETOWN POWER LLC, MONTVILLE POWER LLC, NORWALK POWER LLC,
OSWEGO POWER LLC and SOMERSET POWER LLC, each a Delaware limited liability
company (each a "Borrower" and, collectively, the "Borrowers") hereby jointly
and severally promise to pay to the order of NRG NORTHEAST GENERATING LLC, a
Delaware limited liability company, its successors and assigns( the "Lender"),
on demand in lawful money of the United States in immediately available funds,
at the office of the Lender located at 1221 Nicollet Mall, Suite 700,
Minneapolis, Minnesota 55403, the principal sum of FIFTY MILLION
DOLLARS($50,000,000) or, if less, the aggregate unpaid principal amount of any
moneys borrowed by the Lender for the working capital needs of any of the
Borrowers pursuant to the Working Capital Agreement (as such term is defined
below). The Lender shall record all such borrowings and the principal sum due
under this Note shall be increased accordingly.

                  Each Borrower also promises to pay interest on the unpaid
principal amount hereof in like money at said office from the date hereof until
paid at the rates and at times provided in the Working Capital Agreement.

                  This Note is the Working Capital Intercompany Note referred to
in the Working Capital Agreement, dated February 22,2000, among the Lender (as
the borrower thereunder), the Borrowers (as guarantors thereunder), the lenders
party thereto, The Chase Manhattan Bank, as administrative agent and
Citibank,N.A., as administrative agent and paying agent (the "Working Capital
Agreement").

                  The Borrowers, or any one of them, may voluntarily prepay this
Note, in whole or in part, and shall be considered to have reborrowed amounts
prepaid hereunder to the extent the Lender reborrows prepaid amounts under the
Working Capital Agreement for the working capital needs of any of the Borrowers.
The Lender shall record all such prepayments and reborrowings of principal, and
the principal sum due under this Note shall be reduced or increased, as the case
may be, accordingly.

<PAGE>   2

                  The Borrowers hereby waive presentment, demand, protest or
notice of any kind in connection with this Note. All amounts payable under this
Note are payable without relief from valuation and appraisement laws.

                  This Working Capital Intercompany Note shall be construed in
accordance with and be governed by the law of the State of New York.

                                            ARTHUR KILL POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            ASTORIA GAS TURBINE POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            CONNECTICUT JET POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            DEVON POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

<PAGE>   3

                                            DUNKIRK POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            HUNTLEY POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            MIDDLETOWN POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            MONTVILLE POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            NORWALK POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

<PAGE>   4

                                            OSWEGO HARBOR POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

                                            SOMERSET POWER LLC

                                            By:   /s/ Craig A. Mataczynski
                                                  ------------------------------
                                                  Name:  Craig A. Mataczynski
                                                  Title: President

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