[EXECUTION VERSION]

                    SECOND COLLATERAL CALL EXTENSION LETTER

                                                  Dated as of September 13, 2002

To:      Each of the banks, financial institutions
         and other institutional lenders party
         to each of the credit facilities referred to
         in paragraphs (b) through (g) below,
         in each case in their capacity as lender
         and, to the extent applicable, agent
         for the lenders party thereto


Ladies and Gentlemen:

                  Reference is made to:

                  (a) The Collateral Call Extension Letter, dated as of August
19, 2002, by and among the NRG Collateral Parties (as defined below) and the
Collective Lender Group (as defined below) (such Letter, as further amended,
supplemented or otherwise modified from time to time, being referred to as the
"INITIAL COLLATERAL CALL EXTENSION LETTER");

                  (b) The Credit Agreement, dated as of May 8, 2001, by and
among NRG Finance Company I LLC, Credit Suisse First Boston, acting through its
New York Branch ("CSFB NY"), as Lead Arranger, Sole Book Runner, Administrative
Agent and Documentation Agent, Westdeutsche Landesbank Girozentrale, New York
Branch, as Arranger and Co-Administrative Agent, CIBC Inc. and TD Securities
(USA) Inc., as Arrangers and Co-Syndication Agents, INTESABCI S.p.A., New York
Branch and Kreditanstalt fur Wiederaufbau, as Arrangers and Co-Documentation
Agents, ABN AMRO Bank N.V., Bank of America, N.A., Bayerische Hypo-Und
Vereinsbank AG, New York Branch, BNP Paribas, Citicorp USA, Inc., Deutsche Bank
Alex. Brown, Fortis Capital Corp., The Royal Bank of Scotland PLC and The Bank
of Tokyo-Mitsubishi, Ltd., New York Branch, as Arrangers, and the financial
institutions party thereto from time to time as lenders (such Credit Agreement,
as amended, supplemented or otherwise modified from time to time, being referred
to herein as the "FINCO CREDIT AGREEMENT");

                  (c) The Credit Agreement, dated as of November 28, 2001, among
NRG McClain LLC, as Borrower, Westdeutsche Landesbank Girozentrale, New York
Branch, as Agent and Collateral Agent, and the other financial institutions
party thereto from time to time as lenders (such Credit Agreement, as amended,
supplemented or otherwise modified from time to time, being referred to herein
as the "NRG MCCLAIN CREDIT AGREEMENT");

                  (d) The Loan Agreement, dated as of November 13, 2000, among
NRG MidAtlantic Generating LLC, as Borrower, the Lenders party thereto and
JPMorgan Chase Bank, as Administrative Agent (such Loan Agreement, as amended,
supplemented or otherwise


modified from time to time, being referred to herein as the "NRG MIDATLANTIC
LOAN AGREEMENT");

                  (e) The Credit Agreement, dated as of June 25, 2001, among
Brazos Valley Energy LP, a Delaware limited partnership, Brazos Valley
Technology LP, a Delaware limited partnership, the lenders party thereto from
time to time and ABN AMRO Bank N.V., as Agent and Collateral Agent, as amended
by the First Amendment dated August 8, 2001 and the Second Amendment dated July
18, 2002 (such Credit Agreement, as further amended, supplemented or otherwise
modified from time to time, being referred to herein as the "BRAZOS VALLEY
CREDIT AGREEMENT");

                  (f) The Facility Agreement between Sterling Luxembourg (No. 3)
s.a.r.1. as borrower and guarantor, Killingholme Generation Limited as
guarantor, Killingholme Power Limited as borrower and guarantor, Banc of America
Securities Limited as arranger, facility agent and security trustee, Bank of
America, N.A. as account bank and technical bank and the banks and financial
institutions set forth therein (the "KILLINGHOLME LENDERS"), dated March 29,
2000, as amended and restated on June 5, 2000, further amended on June 30, 2000,
August 11, 2000, April 17, 2001 and June 19, 2001 and as further amended and
restated on September 5, 2001 (such Facility Agreement, as further amended,
supplemented or otherwise modified from time to time, being referred to herein
as the "KILLINGHOLME FACILITY AGREEMENT"); and

                  (g) The Framework Dual Facility Agreement, dated as of October
9, 2001, between ING Bank N.V., acting through its Prague branch (ING Bank N.V.,
organiza*ni slozka), and Entrade GmbH, as amended by the Amendment Letter No. 1
dated January 17, 2002 (such Dual Facility Agreement, as amended, supplemented
or otherwise modified from time to time, being referred to herein as the "ING
ENTRADE FACILITY AGREEMENT", and together with the FinCo Credit Agreement, the
NRG McClain Credit Agreement, the NRG Midatlantic Loan Agreement, the Brazos
Valley Credit Agreement and the Killingholme Facility Agreement being the
"PRIMARY AGREEMENTS", and together with any and all security agreements, equity
undertaking agreements, guarantees, or other similar agreements and undertakings
entered into in connection therewith, being referred to herein as the
"AGREEMENTS"; each of the banks, financial institutions or other institutional
lenders party to any of the Agreements as a lender, hedge counterparty, issuer
of letters of credit or in a similar capacity with respect to the extension of
credit on behalf of any NRG Party (as defined below), being a "LENDER"; and each
of the agents, arrangers or other representatives for the Lenders under the
Agreements, being referred to herein as the "AGENTS", and together with the
Lenders, the "COLLECTIVE LENDER GROUP").

                  The Agreements contain certain provisions wherein NRG Energy
Inc., a corporation organized and existing under the laws of the State of
Delaware (("NRG ENERGY") (and a wholly-owned Subsidiary (as defined below) of
Xcel Energy, Inc. ("XCEL ENERGY")) or certain of NRG Energy's Subsidiaries (NRG
Energy and each such Subsidiary, being an "NRG COLLATERAL PAR" and
collectively, THE "NRG COLLATERAL PARTIES") is required to post cash collateral,
letters of credit or other similar credit support or make certain equity
contributions, or is permitted to cure any Event of Default (as defined below)
by doing the same, as a result of a decline in the credit rating of NRG Energy
below certain specified levels (collectively, such requirements, being
hereinafter referred to as the "COLLATERAL CALLS"). NRG Energy and each of NRG
Energy's Subsidiaries are currently contemplating a comprehensive restructuring
of the

                                       2



assets and liabilities of NRG Energy and its Subsidiaries (THE "PROPOSED
RESTRUCTURING") and in order to provide sufficient time to prepare a
restructuring plan in connection therewith, the parties hereto entered into the
Initial Collateral Call Extension Letter that: (a) postponed the dates as of
which any NRG Collateral Party is required to comply with its obligations in
respect of, and (b) waived any Event of Default arising under any of the
Agreements as a result of (A) any NRG Collateral Party's failure to timely
satisfy any Collateral Call or (B) the decline in the credit rating of NRG
Energy referred to above and the right to take any remedial action in connection
with (x) the failure of such NRG Collateral Party to comply with any such
Collateral Call under any of the Agreements, or (y) the decline in the credit
rating of NRG Energy referred to above, in each case, until September 13, 2002
(such requested postponement and/or waiver referred to in clauses (a) and (b)
being referred to herein as the "INITIAL COLLATERAL EXTENSION"). In addition,
the Killingholme Lenders waived any Event of Default occurring pursuant to
Clauses 481(o) and 48.1 (v) of the Killingholme Facility Agreement, in each
case, until September 13, 2002 (such waiver being referred to herein as the
"INITIAL KILLINGHOLME WAIVER").

                  In connection with the Proposed Restructuring, NRG Energy and
each of NRG Energy's Subsidiaries need additional time to prepare a
restructuring plan. Accordingly, NRG Energy hereby requests that the Collective
Lender Group: (a) (i) further postpone the dates as of which any NRG Collateral
Party is required to comply with its obligations in respect of, and (ii) further
waive any Event of Default arising out of the decline in the credit rating of
NRG Energy referred to above entitling the relevant Lenders to make, the
Collateral Calls, in each case, to the Waiver Termination Date (as defined
below); and (b) further waive (i) any Event of Default arising under any of the
Agreements as a result of (A) any NRG Collateral Party's failure to timely
satisfy any Collateral Call or (B) the decline in the credit rating of NRG
Energy referred to above and (ii) the right to take any remedial action in
connection with (x) the failure of such NRG Collateral Party to comply with any
such Collateral Call under any of the Agreements, or (y) the decline in the
credit rating of NRG Energy referred to above, in each case, until the Waiver
Termination Date; provided, that none of the foregoing shall limit or affect any
right, or the exercise of any remedy, arising out of any such Event of Default,
such failure or such decline to the extent that such right or remedy is with
respect to a Project Subsidiary or Exempted Project and not NRG Energy itself or
any of its other Subsidiaries (such requested postponement and/or waiver
referred to in clauses (a) and (b) being referred to herein as the "SECOND
COLLATERAL EXTENSION").

                  NRG Energy hereby requests that the Killingholme Lenders waive
any Event of Default occurring pursuant to Clauses 48.1(o) and 48.1(v) of the
Killingholme Facility Agreement, in each case, until the Waiver Termination Date
(such requested waiver being referred to herein as the "SECOND KILLINGHOLME
WAIVER").

                  In addition, NRG Energy hereby requests that the Collective
Lender Group not take any action to enforce the terms of the Xcel Support
Agreement (as defined below).

                  1. Extension, etc. (a) Subject to the satisfaction of the
conditions precedent set forth in paragraph 2 hereof and the other terms and
conditions set forth herein, each of the undersigned Agents, on behalf of the
Lenders it represents under each of the Primary Agreements specified by its
signature below (each such Agent being a "SIGNING AGENT") hereby consents, on
behalf of such Lenders, to the Second Collateral Extension. In addition, Banc of



                                        3


America Securities Limited, in its capacity as Facility Agent for the
Killingholme Lenders (in such capacity, the "KILLINGHOLME AGENT"), hereby
consents to the Second Killingholme Waiver. This letter is hereinafter referred
to as this "SECOND COLLATERAL CALL EXTENSION LETTER"; capitalized terms used
herein and not otherwise defined herein have the meanings specified therefor in
Schedule A hereto.

                  (b) On the Waiver Termination Date, without any further action
by any Lender, Agent or the Collective Lender Group, all of the terms and
provisions set forth in the Agreements with respect to Collateral Calls and any
Event of Default or other remedial right provided for in connection with the
failure of any NRG Collateral Party to comply with its obligations in respect of
such Collateral Call shall have the same force and effect as if this Second
Collateral Call Extension Letter had not been entered into by the parties
hereto, and each Agent and Lender shall have all of the rights and remedies
afforded to them under any Agreement to which it is a party or entitled to the
benefits thereof with respect to any failure by any NRG Collateral Party to
comply with any Collateral Call contained therein if such Collateral Call is not
complied with or further extended or waived on or before such date.

                  (c) Nothing in this Second Collateral Call Extension Letter
shall constitute a waiver of, or an agreement to forebear in the exercise of any
remedy available as a result of, any other Event of Default not specifically
referred to in paragraph l(a) above, including any Event of Default arising out
of any failure by any party obligated thereon to make any payment when due of
any payment of principal or interest on any Debt outstanding under any of the
Agreements, including any such failure that may be anticipated on the date
hereof.

                  (d) Subject to the satisfaction of the condition precedent
that Xcel Energy execute and deliver the Xcel Acknowledgement (as defined below)
and the other conditions precedent set forth in paragraph 2 hereof and the other
terms and conditions set forth herein, each Signing Agent and the Killingholme
Agent hereby agrees, on behalf of the Lenders it represents, to not take any
action to enforce the terms of the Xcel Support Agreement (as defined below)
during the term of this Second Collateral Call Extension Letter, except to the
extent not taking such action would reasonably be expected to adversely affect
the rights or remedies of NRG Energy or the Lenders under the Xcel Support
Agreement. The Lenders acknowledge that the execution and delivery of the Xcel
Acknowledgement constitutes a material inducement to the Lenders to grant the
waivers and extension provided for herein and to agree to this paragraph l(d)
and in the absence of such execution and delivery would request NRG Energy to
exercise its rights under the Xcel Support Agreement, including by making a
demand as provided for therein to enforce NRG Energy's rights under the Xcel
Support Agreement.

                  2 . Conditions Precedent. This Second Collateral Call
Extension Letter shall become effective as of the date first above written when
and only when, on or before October 11, 2002, the following conditions shall
have been satisfied:

                  (a) NRG Energy and each of its Subsidiaries indicated on the
         signature pages hereto (each such Person being referred to herein as a
         "NRG PARTY") shall have executed and delivered to each of the Signing
         Agents a copy of this Second Collateral Call Extension Letter;



                                        4




                  (b) Each of the Signing Agents shall have executed and
         delivered to NRG Energy a copy of this Second Collateral Call Extension
         Letter on behalf of Lenders representing at least the Required
         Percentage under the relevant Primary Agreement required to consent to
         the Collateral Extension under the terms of such Primary Agreement, and
         Bane of America Securities Limited, as Killingholme Facility Agent,
         shall have executed and delivered to NRG Energy a copy of this Second
         Collateral Call Extension Letter on behalf of Killingholme Lenders
         representing at least the Required Percentage of the Killingholme
         Lenders under the terms of the Killingholme Facility Agreement.

                  (c) NRG Energy shall have delivered to each of the Agents the
         following financial and other information (which shall in the cases of
         clauses (i), (ii), (iii), (iv), (v) and (vi) be accompanied by a
         certificate of the chief financial officer or treasurer of NRG Energy
         to substantially the effect contemplated by paragraph 3(h)):

                           (i) a 13-week forecast of cash flow and expenditures
                  for NRG Energy and its Subsidiaries for the period commencing
                  with the week of September 2, 2002 (the "CASH FORECAST"),
                  which shall reflect the reasonable estimates by NRG Energy of
                  opening cash balances, operating cash receipts and asset sale
                  and other cash receipts and capital, operating and other
                  expenditures on an as received and as made basis. The Cash
                  Forecast shall include separate forecasts on a consolidating
                  and consolidated basis in a form reasonably acceptable to FTI
                  Policano & Manzo, LLC. Schedules to the Cash Forecast shall
                  include a specific schedule of anticipated payments to
                  Affiliates of NRG Energy and a listing of payments of
                  principal of and interest on the Debt of NRG Energy and its
                  Subsidiaries due during such period (including the dates when
                  due and any applicable grace periods and whether or not such
                  payments are anticipated to be made) and of payments in
                  respect of turbine orders by them due during such period
                  (including whether or not such payments are anticipated to be
                  made);

                           (ii) a schedule of all material assets of NRG Energy
                  and its Subsidiaries that are not subject to any material
                  Liens and any recent material indications of the values
                  thereof;

                           (iii) a listing of all material agreements or
                  instruments that prohibit or limit the ability of NRG Energy
                  or any of its Subsidiaries to create, incur, assume or suffer
                  to exist any Lien upon any of the assets set forth in the
                  previous clause (ii);

                           (iv) to the extent not previously delivered pursuant
                  to the Initial Collateral Call Extension Letter, a list, and
                  copies, of all tax sharing agreements and arrangements, Debt
                  Instruments, Capital Expenditure Agreements, Lease Agreements
                  or Other Material Agreements (or any agreements or documents
                  relating thereto or entered into or delivered in connection
                  therewith) to which NRG Energy or any of its Subsidiaries are
                  a party which require (A) that NRG Energy or such Subsidiary
                  post cash collateral, letters of credit or other similar
                  credit support or make certain equity contributions as a
                  result of a decline in the credit rating of NRG Energy or the
                  occurrence of any other similar credit event or



                                        5



                  (B) provide that NRG Energy or any of its Subsidiaries may
                  cure any Event of Default resulting therefrom or thereunder by
                  doing the same;

                           (v) a listing as of July 31, 2002 of all outstanding
                  loans and open advances made by Xcel Energy, NRG Energy or any
                  of their Subsidiaries to NRG Energy, any of its Subsidiaries
                  or any of its Affiliates; and

                           (vi) a description in reasonable detail of the
                  trading strategies, activities, assets and liabilities of NRG
                  Power Marketing, Inc. ("power marketing"), including of its
                  material contracts (other than "spot" contracts) with third
                  parties and with Subsidiaries of NRG Energy and its practices
                  in dealing with the Project Subsidiaries, including as to
                  allocating benefits and costs associated with its power supply
                  and fuel purchase agreements among such Project Subsidiaries.
                  Such description shall also contain a listing of the required
                  or requested collateral calls made or anticipated to be made
                  upon Power Marketing. Such description shall be prepared in
                  consultation with FTI Policano & Manzo, LLC, who shall be
                  given access to supporting information.

                  (d) The Support and Capital Subscription Agreement, dated as
         of May 29,2002, between NRG Energy and Xcel Energy (the "XCEL SUPPORT
         AGREEMENT") shall be in full force and effect. The agreement in
         substantially the form attached hereto as Exhibit A (the
         "XCEL ACKNOWLEDGMENT") shall be in full force and effect. NRG Energy
         shall have delivered a fully executed copy of the Xcel Acknowledgment
         to the Agents;

                  (e) Xcel Energy shall have executed and delivered to each of
         the Agents a letter agreement in substantially the form attached
         hereto as Exhibit B (the "XCEL LETTER");

                  (f) NRG Energy shall have paid all accrued and unpaid costs,
         fees and expenses of the Advisors (as defined below) as of the date
         hereof; and

                  (g) Each of the Flinders Letter (as defined below) and the
         Enfield Letter (as defined below) shall be in full force and effect and
         each such letter shall have been amended to provide for an extension
         thereof until at least November 15,2002.

                  (h) Power Marketing shall have entered into a security
         agreement in a form satisfactory to counsel for the Global Steering
         Committee (as defined below) to secure its obligations to NRG Energy as
         contemplated in paragraph 4(e)(ii)(E) below and shall have filed,
         registered or recorded, or caused to be filed, registered or recorded
         financing statements in order to create in favor of NRG Energy a
         perfected first priority Lien on the collateral described therein.

                  (i) Xcel Energy shall have submitted to the Securities and
         Exchange Commission an amendment to its Form U- 1
         Application-Declaration under the Public Utility Holding Company Act in
         a form satisfactory to counsel to the Global Steering Committee.

                  3. Representations and Warranties. Each NRG Party hereby
represents and warrants to each of the Lenders and Agents as follows:


                                        6



                  (a) It and each of its Subsidiaries is (i) duly organized or
         formed, validly existing, and, to the extent applicable, in good
         standing under the laws of the jurisdiction of its organization or
         formation, (ii) is duly qualified and, to the extent applicable, in
         good standing under the laws of each other jurisdiction in which it
         owns or leases property or in which the conduct of its business
         requires it to be so qualified or licensed, and (iii) has all requisite
         power and authority to own or lease and operate its property and to
         carry on its business as now conducted and as proposed to be conducted.

                  (b) Its execution, delivery and performance of this Second
         Collateral Call Extension Letter is within its powers, has been duly
         authorized by all necessary corporate or other action, and does not (i)
         contravene its charter, by laws or other similar constituent or
         organizational documents, (ii) violate any law, rule, regulation,
         order, writ, judgment, injunction, decree, determination or award
         applicable to it or any of its Subsidiaries or any of their respective
         properties, (iii) conflict with or result in the breach of, or
         constitute a default or require any payment to be made under, any
         contract, loan agreement, indenture, mortgage, deed of trust, lease or
         other instrument binding on or affecting it or any of its Subsidiaries
         or any of their respective properties or (iv) result in or require the
         creation or imposition of any lien or other similar encumbrance upon or
         with respect to any of its properties or the properties of its
         Subsidiaries.

                  (c) No authorization or approval or other action by, and no
         notice to or filing with, any governmental authority or regulatory body
         or any other third party is required for its execution, delivery or
         performance of this Second Collateral Call Extension Letter.

                  (d) This Second Collateral Call Extension Letter has been duly
         executed and delivered by it and constitutes its legal, valid and
         binding obligation.

                  (e) There is no action, suit, investigation, litigation or
         proceeding affecting it or any of its Subsidiaries pending or, to the
         best of its knowledge, threatened before any court, governmental agency
         or arbitrator that purports to affect the legality, validity or
         enforceability of this Second Collateral Call Extension Letter.

                  (f) Neither it nor any of its Subsidiaries or Affiliates has
         paid or entered into or approved any other arrangement for the payment
         of any fee or other consideration to any of the Lenders or the Agents
         or any of their Affiliates in respect of such Lender's or Agent's
         execution of this Second Collateral Call Extension Letter or to any
         other lender or creditor in respect of any similar agreement,
         including, without limitation, (i) that certain letter agreement, dated
         August 13,2002, from National Australia Bank Limited to NRGenerating
         Holdings (No. 2) GmbH, Flinders Labuan (No. 1) Ltd., Flinders Labuan
         (No. 2) Ltd., and Flinders Power Finance Pty Ltd. in respect of the
         Syndicated Facility Agreement, dated September 7,2000, between Flinders
         Power Finance Pty Ltd. and certain other parties thereto (as amended,
         the "FLINDERS LETTER") and (ii) that certain letter agreement, dated
         August 19,2002, from ABN AMRO Bank N.V., as Bank Agent to Enfield
         Energy Centre Limited and NRG Energy Inc. in respect of the Enfield
         Energy Centre Limited (pound sterling) 219,681,000 Project Finance
         Facilities dated 12 December 1997 between, Enfield Energy Centre
         Limited and ABN AMRO Bank N.V., as Bank Agent and Technical Agent (as
         amended, the "ENFIELD LETTER").


                                        7

                  (g) Neither it nor any of its Subsidiaries is party to any
         Debt Instrument pursuant to which any Event of Default has occurred
         which would allow any lender or other party thereto to accelerate any
         amounts owed under such Debt Instrument or take any other remedial
         action with respect thereto, other than: (i) any such Event of Default
         that has been waived in accordance with the terms of such Debt
         Instrument, (ii) any Event of Default arising in connection with the
         bankruptcy of PG&E, (iii) any such Event of Default arising out of
         amounts due under any power marketing agreement, and (iv) any such
         Event of Default arising in connection with an Exempted Project.

                  (h) All of the information delivered to the Agents pursuant to
         paragraph 2(c) above or paragraph 4(b) below is true, correct and
         complete in all material respects and does not omit any material
         information required to be contained therein and the estimated or
         projected financial information provided pursuant to paragraph 2(c)
         above or paragraph 4(b) below was prepared in good faith on the basis
         of the assumptions set forth therein, which assumptions are fair in
         light of the conditions existing at the time of delivery of such
         forecasts, and represented, at the time of delivery, NRG Energy's best
         estimate of its and, to the extent applicable, its Subsidiaries' future
         financial performance. The Xcel Support Documents (as defined below)
         (i) constitute all of the written agreements with respect to which Xcel
         Energy or any of its Subsidiaries (other than any NRG Energy or any of
         its Subsidiaries) have undertaken to provide equity contributions,
         guaranties, subordinated loans or provide any other financial support
         to, or on behalf of, NRG Energy or any of its Subsidiaries, (ii) have
         not been amended, modified or otherwise supplemented from the forms
         delivered to the Agents (including any amendments or supplements so
         delivered), and (iii) are in full force and effect, enforceable against
         Xcel Energy and each other party thereto in accordance with their
         respective terms.

                  (i) Neither the Flinders Letter nor the Enfield Letter provide
         for a termination prior to the earlier to occur of November 15,2002 and
         the occurrence of a Termination Event and neither is on terms more
         favorable to the Lenders thereunder than the terms of this Second
         Collateral Call Extension Letter are to the Lenders.

                  (j) Xcel Energy is not obligated, either directly or
         indirectly, as primary obligor, guarantor or otherwise, to pay or
         provide any financial support in respect of any costs incurred by NRG
         Energy or any of its Subsidiaries in connection with any Capital
         Expenditure (including any construction costs) related to the conduct
         of NRG Energy's or such Subsidiary's business on or prior to November
         15,2002.

                  (k) NRG Energy and its subsidiaries performed and observed in
         all material respects the terms, covenants and agreements applicable to
         them in the Initial Collateral Call Extension Letter.

                  4. Covenants. Until the occurrence of the Waiver Termination
Date, NRG Energy hereby agrees as follows:

                  (a) At any reasonable time and from time to time, it shall
         permit (or cause to be permitted) any of the Advisors or any Agent or
         Lender through its attorneys, advisors or



                                       8


         consultants, to examine and make copies of and abstracts from the
         records and books of account of, and visit its properties and the
         properties of its Subsidiaries, and to discuss its and its
         Subsidiaries' affairs, finances and accounts with any of their
         respective officers or directors or independent certified public
         accountants or other advisors or consultants. Subject to the provisions
         of paragraph 15 of this Second Collateral Call Extension Letter, it
         shall, and shall cause each of its Subsidiaries to, cooperate with the
         Advisors and any Agent or any Lender through its attorneys, advisors or
         consultants, and to provide information reasonably requested by the
         Advisors or any Agent or Lender through its attorneys, advisors or
         consultants that is in its possession with respect to NRG Energy or any
         of its Subsidiaries or Affiliates.

                  (b) It shall deliver to each of the Agents:

                           (i) by no later than 12:00 (noon) p.m. on each Friday
                  commencing with the first full week after the execution date
                  all conditions set forth in paragraph 2 have been satisfied,
                  (A) consolidating and consolidated statements of cash flow
                  (including cash receipts and disbursements) for NRG Energy and
                  it Subsidiaries (covering the same Subsidiary level as the
                  Cash Forecast) for the immediately preceding week, setting
                  forth in comparative form actual cash flow and planned cash
                  flow from the Cash Forecast for the immediately preceding week
                  which shall include a written report explaining any material
                  variances and all supporting assumptions relied upon, (B) a
                  detailed schedule of each payment or other transaction between
                  NRG Energy or any of its Subsidiaries and any Affiliate
                  thereof (other than NRG Energy or any of its Subsidiaries),
                  including, without limitation, Xcel Energy, during the
                  immediately preceding week, (C) a detailed schedule of each
                  payment made by NRG Energy or any of its Subsidiaries in
                  excess of $50,000 (or the currency equivalent thereof) during
                  the immediately preceding week identifying payor and payee and
                  if payee is a bank identifying the beneficiary thereof, (D) a
                  13-week rolling forecast of cash flow and expenditures for the
                  subsequent 13 weeks in the same form as the Cash Forecast for
                  the period commencing with the Monday of the same week and (E)
                  a detailed schedule of all collateral calls in respect of
                  Power Marketing's obligations setting forth with respect to
                  each such collateral call, the amount, the trading
                  counterparty, the Project Subsidiary on whose behalf Power
                  Marketing is trading and an explanation as to the reason such
                  Project Subsidiary was unable to post such collateral call on
                  its own behalf;

                           (ii) concurrently with the delivery of information
                  pursuant to paragraph 4(b)(i) above, a certificate of the
                  chief financial officer or treasurer of NRG Energy stating
                  that (A) no Termination Event has occurred or is continuing,
                  (B) NRG Energy and its Subsidiaries are in compliance with the
                  terms of this Second Collateral Call Extension Letter, (C) no
                  payments have been made with respect to turbines (other than
                  in connection with any Exempted Project to the extent funded
                  with Debt incurred in connection with such Exempted Project),
                  (D) neither NRG Energy nor any of its Subsidiaries has engaged
                  in any speculative trading and (E) NRG Energy was in
                  compliance with paragraph 4(p) below for each day of the
                  preceding week;

                                        9



                           (iii) by no later than 23 days after the end of each
                  month (commencing with August 2002), (A) the consolidating and
                  consolidated balance sheets, income statements and cash flow
                  statements (including cash receipts and disbursements) for NRG
                  Energy and each of its Subsidiaries (on a Subsidiary by
                  Subsidiary basis) for such month, setting forth in each case
                  in comparative form (commencing with the statements for
                  September 2002) the figures from the statements referred to in
                  paragraph 4(b)(v) below which shall include a written report
                  explaining any material variances and all supporting
                  assumptions relied upon, (B) a narrative discussion and
                  analysis of the financial condition and results of operations
                  of NRG Energy and its Subsidiaries for such month, as compared
                  to the previous month, (C) a schedule setting forth a listing
                  by Debt Instrument and in the aggregate of payments of
                  principal of and interest on the Debt of NRG Energy and its
                  Subsidiaries due during the succeeding twelve-month period
                  (including the dates when due and any applicable grace periods
                  and whether or not such payments are anticipated to be made)
                  and (D) a schedule setting forth as of the end of such month
                  all outstanding loans and open advances made by Xcel Energy,
                  NRG Energy or any of their Subsidiaries to NRG Energy, any of
                  its Subsidiaries or any of its Affiliates;

                           (iv) by no later than 23 days after the end fiscal
                  quarter, a schedule setting forth a listing by Debt Instrument
                  and in the aggregate of payments of principal of and interest
                  on the Debt of NRG Energy and its Subsidiaries due during the
                  succeeding five-year period (including the dates when due and
                  any applicable grace periods and whether or not such payments
                  are anticipated to be made);

                           (v) by no later than the 25th day of each month
                  (commencing September 25,2002), forecasts prepared by
                  management of NRG Energy of consolidated and consolidating
                  balance sheets, income statements and cash flow statements
                  (including cash receipts and disbursements) for NRG Energy and
                  each of its Subsidiaries (on a Subsidiary by Subsidiary basis)
                  for each month and the last day of such month in the next
                  three-month period commencing on the first day of the next
                  month;

                           (vi) on or prior to October 15, 2002, a not less than
                  three-year detailed business plan for NRG Energy and its
                  Subsidiaries that has been approved by the Board of Directors
                  of NRG Energy for presentation to its creditors (the "BUSINESS
                  Plan"), and the Business Plan or information provided
                  concurrently with it shall describe the assumptions used in
                  the preparation thereof and include supporting detail for the
                  valuations used as the basis for the decision-making with
                  respect to projects which is reflected therein. The Business
                  Plan shall be in scope and detail reasonably satisfactory to
                  the Agents;

                           (vii) on or prior to October 31, 2002, a detailed
                  restructuring plan approved by the Board of Directors of NRG
                  Energy that provides for (1) the Proposed Restructuring of NRG
                  Energy and its Subsidiaries and (2) Xcel Energy


                                       10





                  to satisfy its obligations under the Xcel Support Agreement
                  and Xcel Acknowledgement;

                           (viii) to the extent not previously provided pursuant
                  to the Initial Collateral Call Extension Letter, on or prior
                  to September 27,2002, copies of (A) all tax sharing agreements
                  and arrangements, Debt Instruments, Capital Expenditure
                  Agreements, Lease Agreements and Other Material Agreements
                  together with any amendments, modifications and supplements
                  thereto and any other material documents or agreements
                  relating thereto or entered into in connection therewith, (B)
                  any other material agreement relating to the ownership,
                  development, construction, operation or maintenance of any of
                  the businesses or properties of NRG Energy and its
                  Subsidiaries, (C) any agreement relating to any material
                  supply arrangements entered into by NRG Energy or any of its
                  Subsidiaries, (D) any material contract or agreement relating
                  to the sale or proposed sale of energy by NRG Energy or any of
                  its Subsidiaries or any of their assets or properties and (E)
                  any surety instrument, performance bond, guaranty or other
                  similar instrument or agreement issued or entered into by Xcel
                  Energy with respect to the power marketing obligations of NRG
                  Energy or any of its Subsidiaries (collectively, the "XCEL
                  POWER MARKETING GUARANTEES" and together with the Xcel Support
                  Agreement and Xcel Acknowledgement, the "Xcel SUPPORT
                  DOCUMENTS");

                           (ix) written notice at least five days prior to (A)
                  entering into any transaction with any Affiliate or (B) making
                  any payment or payments in an aggregate amount over $100,000
                  (or the currency equivalent thereof) that are not specifically
                  reflected on the Cash Forecast or on a schedule thereto;

                           (x) promptly upon receipt thereof, copies of all
                  notices, requests and other documents received by NRG Energy
                  or any of its Subsidiaries under the Flinders Letter, the
                  Enfield Letter or any Debt Instrument, Capital Expenditure
                  Agreement, Lease Agreement or Other Material Agreement
                  regarding or related to any breach or default by any party
                  thereto or any other event that could materially impair the
                  value of the interests or the rights of NRG Energy or any of
                  its Subsidiaries in respect of such agreement or which could
                  otherwise reasonably be expected to have a material adverse
                  effect on the business, condition (financial or otherwise),
                  operations, performance, properties or prospects of NRG Energy
                  or any of its Subsidiaries or NRG Energy's or any of its
                  Subsidiaries' ability to perform its obligations under any of
                  the Agreements or this Second Collateral Call Extension Letter
                  and copies of any amendment, modification or waiver of any
                  provisions of any Debt Instrument, Capital Expenditure
                  Agreement, Lease Agreement or Other Material Agreement;

                           (xi) promptly after the commencement thereof, notice
                  of any action, suit, investigation, litigation or proceeding
                  before any court or governmental department, commission,
                  board, bureau, agency or instrumentality, domestic or foreign,
                  affecting NRG Energy or any of its Subsidiaries or Affiliates
                  which could reasonably be expected to have a material adverse
                  effect on the business,


                                       11





                  condition (financial or otherwise), operations, performance,
                  properties or prospects of NRG Energy or any of its
                  Subsidiaries or NRG Energy's or any of its Subsidiaries'
                  ability to perform its obligations under any of the Agreements
                  or this Second Collateral Second Call Extension Letter;

                           (xii) promptly after the filing thereof, copies of
                  any financial statements or reports that Xcel Energy, NRG
                  Energy or any of its Subsidiaries sends to its stockholders,
                  members or partners, and copies of all regular, periodic and
                  special reports that NRG Energy or any of its Subsidiaries or
                  Affiliates files with the Securities and Exchange Commission
                  or any similar governmental authority;

                           (xiii) promptly after the furnishing thereof, copies
                  of any statement, report or document furnished to any creditor
                  of NRG Energy or any of its Subsidiaries which has not
                  otherwise been furnished to the Agents pursuant to the
                  Agreements or this Second Collateral Call Extension Letter;

                           (xiv) by no later than 12:00 (noon) p.m. on each
                  Wednesday, commencing with Wednesday September 18,2002, a
                  detailed written report setting forth the developments and
                  activities during the week covered thereby with respect to
                  contemplated asset sales (such reports shall include, by way
                  of example, (1) any change in the anticipated closing date of
                  each asset sale, (2) expected net cash proceeds of each asset
                  sale, (3) number of bidders, (4) status of regulatory
                  clearances, as applicable and (5) drafts of all agreements
                  that have been circulated among the parties with respect to
                  such asset sales), the first such report to include all
                  developments and activities since September 2,2002;

                           (xv) from time to time upon request by any of the
                  Co-Chairs of the Global Steering Committee (as defined below)
                  and otherwise as may be considered appropriate by NRG Energy,
                  a report describing any material discussions that Xcel Energy,
                  NRG Energy or any of its Subsidiaries (including
                  representatives and advisors of NRG Energy or any of its
                  Subsidiaries) has had with any material creditor of NRG Energy
                  or any of its Subsidiaries;

                           (xvi) on or prior to October 15,2002, deliver a
                  written transition, remediation and security plan that
                  provides for the winding down of each of the Exempted
                  Projects; provided, that such plan must be reasonably
                  satisfactory to the Agent for the Lenders party to any Debt
                  Instrument relating to such Exempted Project and to the
                  Co-Chairs of the Global Steering Committee; and

                           (xvii) promptly, notice of any demand or notices of
                  termination or default received by NRG Energy or any of its
                  Subsidiaries under or in respect of the Flinders Letter, the
                  Enfield Letter or any Debt Instrument, Capital Expenditure
                  Agreement, Lease Agreement or Other Material Agreement that
                  may be material to the interests of NRG Energy or the Lenders.

                  (c) It shall cause its and its Subsidiaries' management and
         officers to be available to meet with the Agents, the Lenders and any
         of their attorneys, advisors or consultants,

                                       12



         including, without limitation, the Advisors on a regular basis as
         reasonably requested from time to time by the Agents or Advisors.

                  (d) It shall cooperate in taking all actions necessary to
         protect and preserve the rights of NRG Energy under the Xcel Support
         Agreement and Xcel Acknowledgement, including by taking such actions as
         may be necessary to ensure that its rights and remedies under the Xcel
         Support Agreement and Xcel Acknowledgement shall not be affected by the
         commencement by or against NRG Energy of any bankruptcy proceeding.

                  (e) It shall not create, incur, assume or suffer to exist, or
         permit any of its Subsidiaries to create, incur, assume or suffer to
         exist, any Lien on or with respect to any of its properties of any
         character (including, without limitation, accounts) whether now owned
         or hereafter acquired, or sign or file or suffer to exist, or permit
         any of its subsidiaries to sign or file or suffer to exist, under the
         Uniform Commercial Code of any jurisdiction, a financing statement that
         names it or any of its Subsidiaries as debtor, or sign or suffer to
         exist, or permit any of its Subsidiaries to sign or suffer to exist any
         security agreement authorizing any secured party thereunder to file
         such financing statement or assign, or permit any of its Subsidiaries
         to assign, any accounts or other right to receive income, except:

                           (i) Liens in effect as of the date hereof;

                           (ii) each of the following, as to which no
                  enforcement, collection, execution, levy or foreclosure
                  proceeding shall have been commenced:

                                (A) Liens for taxes, assessments and
                           governmental charges or levies not yet due and
                           payable;

                                (B) Liens imposed by law, such as materialmen's,
                           mechanics', carriers, workmen's and repairmen's liens
                           (i) that are with respect to obligations not overdue
                           for a period of more than 30 days and do not
                           materially adversely affect the use of the property
                           to which they relate, or (ii) in the case of Liens on
                           any Exempted Project, that result from the
                           non-payment of obligations with respect to an
                           Exempted Project;

                                (C) pledges or deposits to secure obligations
                           under workers' compensation laws or similar
                           legislation or to secure public or statutory
                           obligations;

                                (D)easements, rights of way and other
                           encumbrances on title to real property that do not
                           render title to the property encumbered thereby
                           unmarketable or materially adversely affect the use
                           of such property for its present purposes; and

                                (E) Liens resulting from collateral calls in
                           respect of Power Marketing's obligations in an
                           aggregate amount at any one time outstanding not to
                           exceed $20,000,000 (or the currency equivalent
                           thereof), plus (x) any collateral calls funded by any
                           Project Subsidiary



                                       13



                           with its own cash resources (including loans or
                           advances by lenders to it) and (y) any collateral
                           calls previously met with funds as permitted under
                           the Initial Collateral Call Extension Letter;
                           provided, that to the extent that NRG Energy or any
                           of its non-Project Subsidiaries funds any such
                           collateral call, (i) the trading agreement or
                           arrangement related to such collateral call is not
                           supported by a guarantee or other credit support by
                           Xcel Energy, (ii) NRG Energy's funding thereof shall
                           take the form of a loan to Power Marketing evidenced
                           by a note in a form satisfactory to counsel to the
                           Global Steering Committee and such loan shall be
                           secured by a perfected first priority security
                           interest in the assets (including contract rights and
                           other general intangibles) of Power Marketing to the
                           extent such a security interest may be granted
                           therein under the contractual obligations of NRG
                           Energy and its Subsidiaries and may be so granted
                           without requiring an equal and ratable Lien in favor
                           of any other person and (iii) in the reasonable
                           judgment of NRG Energy, the funding of any such
                           collateral call provides a material benefit to a
                           project which is not an Exempted Project. Such
                           $20,000,000 may be increased with the consent of the
                           Agents.

                           (iii) transfers of revenues received by NRG Energy or
                  its Subsidiaries to any account (including any debt service
                  reserve account or other similar collateral account) required
                  pursuant to the terms of any Debt Instrument as in effect as
                  of the date hereof.

                  (f) It shall not, directly or indirectly, optionally prepay,
         redeem, purchase, defease or otherwise satisfy prior to the scheduled
         maturity thereof in any manner or enter into any transaction the
         economic consequence of which would be the same, or make any payment in
         violation of any subordination terms of any Debt owed by it or any of
         its Subsidiaries, or amend, modify or change in any manner any material
         payment term of any such Debt or permit any of its Subsidiaries to do
         any of the foregoing.

                  (g) Except to the extent otherwise expressly provided in this
         Second Collateral Call Extension Letter, it shall not sell, lease,
         transfer or otherwise dispose of, or permit any of its Subsidiaries to
         sell, lease, transfer or otherwise dispose of, any assets, or grant any
         option or other right to purchase, lease or otherwise acquire any
         assets to, in each case, any of its Affiliates (other than to NRG
         Energy and its Subsidiaries and in the ordinary course of business).

                  (h) It shall not make or hold, or permit any of its
         Subsidiaries to make, or hold any investment in or loan to any of its
         Affiliates, except for (i) investments or loans in existence as of the
         date hereof or (ii) investments by NRG Energy or its Subsidiaries in
         their Subsidiaries to the extent the proceeds thereof are used to make
         any payments listed on the Cash Forecast or a schedule thereto.

                  (i) It shall not declare or pay any dividend, purchase,
         redeem, retire, defease or otherwise acquire for value any of its
         equity interests now or hereafter outstanding, return any capital to
         its stockholders, partners or members (or the equivalent persons
         thereof) as


                                       14







         such, make any distribution of assets, equity interests, obligations or
         securities to its stockholders, partners or members (or the equivalent
         persons thereof) as such or permit any other NRG Collateral Party to do
         any of the foregoing, or permit any other NRG Collateral Party to
         purchase redeem, retire, defease or otherwise acquire for value any
         equity interests in NRG Energy or any of its Affiliates.

                  (j) It shall not create, incur, assume or suffer to exist, or
         permit any of its Subsidiaries to create, incur, assume or suffer to
         exist, any indebtedness or other obligations as lessee (i) for the
         rental or hire of real or personal property in connection with any sale
         and leaseback transaction or (ii) for rental or hire of other real or
         personal property of any kind under leases or agreements to lease
         (including, without limitation, any capitalized lease) except for such
         Lease Agreements as are in existence as of the date hereof or are
         entered into in the ordinary course of business in a manner consistent
         with the past practice of NRG Energy or such Subsidiary.

                  (k) It shall not engage, or permit any of its Subsidiaries to
         engage, in any transaction involving any Swap Contract except for such
         transactions as are entered into in the ordinary course of business in
         a manner consistent with the past practice of NRG Energy or such
         Subsidiary.

                  (1) It shall not make, nor permit any of its Subsidiaries to
         make, any Capital Expenditure except for:

                           (i) such obligations as it or its Subsidiaries have
                  incurred as of the date hereof pursuant to a legally binding
                  Capital Expenditure Agreement and which are payable on or
                  prior to the Waiver Termination Date in accordance with their
                  terms; and

                           (ii) obligations incurred in the ordinary course of
                  business after the date hereof in a manner consistent with the
                  past practice of NRG Energy or such Subsidiary which are
                  payable on or prior to the Waiver Termination Date in
                  accordance with their terms and the terms of this Agreement
                  and the Xcel Letter.

                  (m) It shall not make any payment, or permit any of its
         Subsidiaries to make any payment, to any other Person (including Xcel
         Energy or any Affiliate thereof) except for payments specifically
         contemplated (in amount and timing) by the Cash Forecast and in
         accordance with the other provisions of this Second Collateral Call
         Extension Letter or the Xcel Letter. For purposes of this paragraph
         4(m), the Cash Forecast shall refer to a revised version of the Cash
         Forecast which NRG Energy shall prepare and deliver to the Lenders upon
         delivery of the Business Plan if at the time thereof NRG Energy is
         designating additional projects as Exempted Projects as contemplated by
         the definition thereof, which revised version shall only omit payments
         by NRG Energy and its other Subsidiaries to or on behalf of the Project
         Subsidiaries related to such additional Exempted Projects as NRG Energy
         reasonably determines are appropriate as a result of such designation.

                                       15


                  (n) It shall not, nor shall it permit any of its Subsidiaries
         to, incur any indebtedness or other obligation which involves
         consideration payable by it or any of its Subsidiaries in excess of
         $100,000 (or the currency equivalent thereof) in the aggregate, other
         than any such obligation incurred in the ordinary course of business in
         a manner consistent with the past practice of NRG Energy or such
         Subsidiary.

                  (o) It shall not enter into any amendment, side letter or
         similar agreement or other commitment with any Lender or other creditor
         of NRG Energy or any of its Subsidiaries (other than trade and similar
         creditors the obligations owing to which are not material in relation
         to the Debt of NRG Energy and its Subsidiaries) that has the effect of
         establishing rights, creating improvements of position or otherwise
         benefiting such Lender or creditor, as the case may be, in a manner
         more favorable in any respect to such Lender or creditor, as the case
         may be, than the rights, improvements and benefits established in favor
         of the Lenders by this Second Collateral Call Extension Letter.

                  (p) It shall not permit for any day the aggregate available
         cash resources (excluding any restricted or segregated cash or cash
         subject to any Lien) of NRG Energy and its Subsidiaries which are not
         Project Subsidiaries or foreign Subsidiaries to be less than the amount
         set forth opposite the week in which such day occurs on Schedule 1
         hereto, plus (i) 85% of the net proceeds from asset sales received by
         NRG Energy and such Subsidiaries since the date hereof (including any
         such net proceeds received by them from asset sales by Project
         Subsidiaries or foreign Subsidiaries), (ii) 85% of the other amounts
         received by NRG Energy and such Subsidiaries from Project Subsidiaries
         in the United States since the date hereof not contemplated by the Cash
         Forecast, (iii) 50% of the other amounts received by NRG Energy and
         such Subsidiaries from foreign Subsidiaries or other foreign sources
         since the date hereof (other than amounts received under clause (i)
         above) and (iv) other cash inflows received by NRG Energy and such
         Subsidiaries from other sources not contemplated by the Cash Forecast.
         To the extent consistent with the Debt Instruments to which such
         Project Subsidiary is a party, it shall cause each Project Subsidiary
         to dividend or advance to it all cash which is available to such
         Project Subsidiary for distribution and is not reasonably necessary for
         the conduct by such Project Subsidiary of its business or activities.

                  (q) It shall not and shall not permit any of its Subsidiaries
         to enter into any agreement or understanding to make any material
         payment payable after November 15, 2002, except for agreements or
         understanding, entered into in the ordinary course of business in a
         manner consistent with the past practices of NRG Energy or such
         Subsidiary. In no event shall Power Marketing enter into any trading
         contract for a period that is in whole or in part past November 15,
         2002 unless such trading contract is nonspeculative in nature and is
         part of a series of relating trading contracts that assure a favorable
         fuel purchase and power supply arrangement for a particular project or
         region.

                  (r) To the extent practicable, it shall not commingle or
         permit Power Marketing or any of its other Subsidiaries to commingle
         cash of its Project Subsidiaries with separate indebtedness with the
         cash of NRG Energy or any other of its Subsidiaries, and if and to the
         extent there is any such commingling, it shall take appropriate
         measures to track and record such cash. It shall cause Power Marketing
         to settle no less often than

                                       16


         weekly all of its payment obligations to NRG Energy and its other
         Subsidiaries; and on or prior to October 9, 2002 it shall cause Power
         Marketing to remit to each Project Subsidiary all power revenues for
         sales by Power Marketing of station power generated by such Project
         Subsidiary through the period ending on September 30, 2002, to the
         extent that the same have not been therefore remitted to such Project
         Subsidiary, with any such amount being subject only to charges not
         previously paid by such Project Subsidiary and determined in accordance
         with applicable agreements and Power Marketing's current practices in
         dealing with the Project Subsidiaries generally.

                  (s) It shall not make or meet or cause to be made or met any
         payment (including the providing of any cash collateral) or collateral
         call using the cash of NRG Energy or any of its other Subsidiaries for
         the benefit of a Project Subsidiary if such payment or capital call can
         be made or met by such Project Subsidiary with its own cash resources,
         including from cash that has been "restricted" pursuant to the terms of
         an agreement in existence on the date hereof but that is available
         under such agreement for use to make such payment for such.

                  (t) It shall not permit Power Marketing to (i) terminate, or
         fail to utilize the rights and benefits available to it under, any
         trading contract or arrangement supported by a guarantee or other
         credit support from Xcel Energy, unless such termination or failure is
         in the best interest of NRG Energy and its Subsidiaries, or (ii)
         release Xcel Energy from any guarantee or credit support with respect
         to any trading contract or arrangement.

                  (u) It shall not effect any amendment, modification or waiver
         to the Xcel Support Agreement or the Xcel Acknowledgement.

                  5. No Further Advances Etc. Each of the NRG Parties on behalf
of itself and its Subsidiaries hereby agrees and acknowledges that prior to the
Waiver Termination Date it will not make, nor shall any of its Subsidiaries
make, any further draws or requests for loans, advances or the issuance of any
letters of credit or other extensions of credit under any of the Agreements
without the express written consent of the Required Percentage of Lenders
required to waive any condition precedent to the making of such draw, loan or
advance or the issuance of any letter of credit or the making of any other
extension of credit under the terms of such Agreement (or the related Primary
Agreement); provided, that notwithstanding the foregoing, nothing in this Second
Collateral Call Extension Letter shall prohibit the rollover of any outstanding
loan or advance on the date regularly scheduled for such rollover under any of
the Agreements or the deemed making of any loan or advance under any of the
Agreements as a result of the payment by any of the Lenders or Agents of any
amounts required to protect any collateral under the Agreements or as otherwise
provided for under the Agreements.

                  6. Termination Events. Upon the occurrence of any of the
following events (each such event being a "TERMINATION EVENT"):

                  (a) Any representation or warranty made by any NRG Party (or
         any of its officers) under or in connection with this Second Collateral
         Call Extension Letter or any document delivered pursuant hereto shall
         prove to have been incorrect in any material respect when made; or


                                       17


                  (b) Any NRG Party shall fail to perform or observe any other
         term, covenant or agreement contained in this Second Collateral Call
         Extension Letter on its part to be performed or observed; or

                  (c) Xcel Energy shall fail to perform or observe any term,
         covenant or agreement contained in the Xcel Letter on its part to be
         performed or observed, shall contest or deny the enforceability of any
         of its obligations thereunder or under the Xcel Support Agreement or
         shall fail to perform or observe any term, covenant or agreement
         contained in the Xcel Acknowledgment; or

                  (d) Any Event of Default (other than (i) any Event of Default
         that has been waived in accordance with the terms of the relevant
         Agreement or Debt Instrument, (ii) an Event of Default arising in
         connection with the bankruptcy of PG&E or any Exempted Project, (iii)
         any Event of Default existing on the date hereof arising out of amounts
         due under any power marketing agreement or in respect of any Exempted
         Project and (iv) any Event of Default arising out of a failure by NRG
         Energy or any of its Subsidiaries to make payment when due on account
         of principal or interest on any Debt, including under the Agreements
         but excluding any such Event of Default which has arisen out of or
         serves as the basis of any acceleration of any such Debt) under any
         Agreement or Debt Instrument shall occur and continue for one (1) day
         without waiver by the Required Percentage of Lenders party to such
         Agreement (or related Primary Agreement) or the requisite percentage of
         lenders or creditors under any other Debt Instrument required to
         consent to such waiver under the terms of such Agreement, or other Debt
         Instrument as the case may be; provided that (x) any Event of Default
         which has arisen out of or serves as the basis of any acceleration of
         any Debt and (y) the occurrence of any insolvency or bankruptcy event
         in respect of NRG Energy or any of its Subsidiaries (other than any
         Project Subsidiary owning an Exempted Project) which constitutes an
         Event of Default, in each such case, shall result in an immediate and
         automatic termination of this Second Collateral Call Extension Letter
         without giving effect to any grace period in connection therewith; or

                  (e) Xcel Energy shall invest or commit to invest (within the
         meaning of Rule 53(a)(l)(i) of the Public Utility Holding Company Act)
         in any Person that is an "exempt wholesale generator" or "foreign
         utility company" (in either case as defined under the Public Utility
         Holding Company Act) other than NRG Energy which investment or
         commitment to invest shall reduce the amount permitted to be invested
         or committed to be invested in NRG Energy and its Subsidiaries under
         the Public Utility Holding Company Act (including, without limitation,
         under Rule 53 and 54 thereunder); or

                  (f) Any other agreement similar in effect to this Second
         Collateral Call Extension Letter entered into in respect of any Debt
         Instrument shall terminate, including, without limitation, the Flinders
         Letter; or

                  (g) Any of Jones, Day, Reavis & Pogue, Lazard Freres & Co. LLC
         or Zolfo Cooper LLC (or any other replacement advisor reasonably
         acceptable to the Lenders) shall no longer be acting as an advisor to
         NRG Energy; or


                                       18


                  (h) Xcel Energy shall no longer own and control 100% of the
         equity interests in NRG Energy or Xcel Energy shall make any public
         statement that is contrary to its statement in the last sentence of the
         third paragraph of Note 6 of the Notes to Consolidated Statements in
         its Form 10-Q filed with the Securities and Exchange Commission for the
         fiscal quarter ended June 30, 2002 and which was filed on August 14,
         2002 and which is a material adverse change to the prospects of NRG
         Energy and its Subsidiaries or Xcel Energy shall fail to make the tax
         sharing payments to NRG Energy and its Subsidiaries contemplated by the
         Cash Forecast; or

                  (i) any federal, state or local governmental agency or
         regulatory body (including, without limitation, the Securities and
         Exchange Commission) shall take any action that may reasonably be
         expected to limit Xcel Energy's ability to perform its obligations
         under the Xcel Support Agreement or the Xcel Acknowledgment;

then, and in any such event, (A) if such event is a Termination Event specified
in the proviso to clause (d) of this paragraph 6 above, automatically this
Second Collateral Call Extension Letter shall immediately terminate, and (B) if
such event is any other Termination Event then, with the consent of any Agent(s)
representing at least 25% by amount of the Lenders or of any three or more
Agents and notice from such Agent(s) to NRG Energy, this Second Collateral Call
Extension Letter shall immediately terminate.

                  7 . Exempted Projects. Notwithstanding anything herein to the
contrary, each of the parties hereto hereby agrees and acknowledges that with
respect to each of the Exempted Projects:

                  (a) Each Lender and Agent party to any Debt Instrument
         governing or evidencing any Debt incurred by any Project Subsidiary in
         respect of such Exempted Project (each such Debt Instrument, being a
         "EXEMPTED PROJECT DEBT INSTRUMENT") shall not be prejudiced or limited
         by any of the waivers or extensions contemplated by this Second
         Collateral Call Extension Letter in connection with its exercise of
         remedies in connection with such Exempted Project, Project Subsidiary
         or any collateral provided to secure such defaulted Exempted Project
         Debt Instrument, including without limitation, foreclosure of any
         equity interests in a Project Subsidiary pledged by NRG Energy or any
         of its Subsidiaries;

                  (b) NRG Energy and each of its Subsidiaries each hereby
         acknowledge and agree that, by entering into this Second Collateral
         Call Extension Letter, each of NRG Energy and each of its Subsidiaries
         does hereby waive, for the benefit of each holder or owner of an
         interest in an Exempted Project Debt Instrument, any defense,
         affirmative defense, offset, claim or counterclaim under any legal or
         equitable theory based upon the fact that NRG Energy (in respect of the
         Exempted Project at issue) is not named in any action or claim
         commenced at any time prior to the Waiver Termination Date to enforce
         remedies in respect of a default under the applicable Exempted Project
         Debt Instrument (a "COVERED ACTION"). Each of NRG Energy and each of
         its Subsidiaries each hereby further expressly waives the right to
         assert as a defense, affirmative defense, offset, claim or counterclaim
         in respect of any action or claim to enforce obligations of NRG Energy
         (in respect of the Exempted Project at issue) in respect of any
         Exempted Project Debt

                                       19

         Instrument: (i) the argument that NRG Energy is or was an indispensable
         party to such Covered Action; (ii) the argument that all claims arising
         out of the same general set of facts should have been joined in a
         single action; (iii) any argument based upon latches, waiver or
         estoppel due to the failure to name NRG Energy in such Covered Action;
         or (iv) the running of any applicable statute of limitations during the
         pendency of this Second Collateral Call Extension Letter. Each of NRG
         Energy its Subsidiaries hereby acknowledge the assistance of counsel in
         making the foregoing waivers and acknowledge that such waivers are
         intended to facilitate the success of this letter agreement by
         permitting lenders to Exempted Projects to enforce rights against the
         Exempted Projects, the Project Subsidiaries and any collateral pledged
         in support of the respective Exempted Projects, the Project
         Subsidiaries and any collateral pledged in support of the respective
         Exempted Project Debt Instrument without prejudice to their rights
         under agreements with NRG Energy in respect of the Second Collateral
         Extension;

                  (c) NRG Energy and the Lenders and Agents party to the
         Exempted Project Debt Instrument relating to such Exempted Project may
         enter into discussions for, and consummate, a restructuring of each
         such Exempted Project (each a "EXEMPTED PROJECT RESTRUCTURING"), which
         may include a transfer of all or some of the assets of such Exempted
         Project or the equity interests of the Project Subsidiary owning such
         Exempted Project or such other actions as may be agreed between NRG
         Energy and the Lenders and Agents parties to such Exempted Project Debt
         Instrument in respect of such Exempted Project and, nothing in this
         Second Collateral Call Extension Letter shall limit the terms and
         conditions of any such Exempted Project Restructuring or any of the
         agreements or undertakings of NRG Energy entered into in connection
         therewith, and

                  (d) NRG Energy shall take all steps and actions and otherwise
         cooperate with each Agent party to an Exempted Project Debt Instrument
         as such Agent may reasonably request in connection with the
         preservation of the value of each Exempted Project and appropriate
         safeguarding and remediation efforts with respect thereto to the extent
         such request entails no material expenditure or disadvantage to NRG
         Energy that may materially and adversely affect creditors of NRG
         Energy.

                  8. Reservation of Rights. NRG Energy acknowledges and agrees
that, other than with respect to the waivers and extension set forth
specifically in this Second Collateral Call Extension Letter, the Lenders and
the Agents party to the various Debt Instruments shall preserve all rights and
remedies set forth therein and under applicable law, and nothing contained
herein shall in any way limit said rights or diminish any of the obligations of
NRG Energy or any of its Subsidiaries contained in any such Debt Instruments.

                  9. Notices. All notices and other communications provided for
hereunder shall be in writing and shall be delivered to each Agent or Lender, as
the case may be, in accordance with the relevant notice provisions of each
Agreement to which such Agent or Lender is a party and to NRG Energy or any of
its Subsidiaries to NRG Energy at NRG Energy's address at PO Box 9477, 11
Nicollett Mall, Minneapolis, Minnesota 55484, Attention: Richard Kelly; phone
number: (612) 215-5372; fax number: (612) 215-4615, and email:
Richard.Kelly@Xcelenergy.com; with a copy to Jones Day, Reavis & Pogue at its
address at 77


                                       20


West Wacker Drive, Chicago, Illinois 60601, Attention: Peter Clarke; phone
number (312) 782-3939 and fax number: (312) 782-8585.

                  10. Ratification Etc. Each of the Agreements are and shall
continue to be in full force and effect and are hereby in all respects ratified
and confirmed. Without limiting the generality of the foregoing, any guaranty or
collateral document relating to any of the Agreements and all of the collateral
described therein, if any, do and shall continue to guaranty or secure, as the
case may be, the payment of all obligations contemplated to be guaranteed or
secured by such guaranty or collateral under such collateral document. The
execution, delivery and effectiveness of this Second Collateral Call Extension
Letter shall not, except to the extent of the Collateral Extension and solely
with respect to Killingholme Facility Agreement, the Killingholme Waiver,
operate as a waiver of any right, power or remedy of any Lender or Agent under,
or any default (now or hereafter existing) of any NRG Party under, any of the
Agreements, at law or otherwise, nor constitute a waiver of any provision of any
Agreement.

                  11. Amendments; Waivers Etc. No amendment or waiver of any
provision of this Second Collateral Call Extension Letter or the Xcel Letter,
nor consent to any departure by NRG Energy, any NRG Party, Xcel Energy or any of
their respective Affiliates or Subsidiaries therefrom, shall in any event be
effective unless the same shall be in writing and signed by Signing Agents on
behalf of Lenders representing the same Required Percentage of Lenders under
each Primary Agreement as is required in connection with the granting of the
waivers contemplated by this Second Collateral Call Extension Letter. Any
amendment or waiver of any provisions of this Second Collateral Call Extension
Letter or the Xcel Letter or any further amendment or waiver of any Agreement
may be made by the Required Percentage of the relevant Lenders (each Lender
acting in its sole discretion).

                  12. Fees and Expenses. NRG Energy hereby agrees to pay on
demand (a) all fees, costs and expenses of (i) FTI Policano & Manzo, LLC, PA
Consulting Group, Inc. and Simpson Thacher & Bartlett or (ii) in the event that
any other attorney, advisor or consultant is substituted therefor or otherwise
appointed by the Lenders or Agents in respect of the Proposed Restructuring upon
the formation of any steering or coordinating committee by the Lenders (any such
committee being hereinafter referred to as the "GLOBAL STEERING COMMITTEE"),
such other attorney, advisors or consultants (collectively, the "ADVISORS")
incurred in connection with their acting as advisors to any of the Lenders,
Agents or the Global Steering Committee, as the case may be, in respect of this
Second Collateral Call Extension Letter or the Proposed Restructuring and (b)
all reasonable costs and expenses of each Agent and Lender in connection with
the preparation, execution and delivery of, or enforcement of, this Second
Collateral Call Extension Letter or the Xcel Letter or in connection with the
Proposed Restructuring, whether in any action, suit or litigation, or any
bankruptcy, insolvency or other similar proceeding affecting creditors' rights
generally or otherwise (including, without, limitation, the reasonable fees and
expenses of counsel for each Agent and Lender).

                  13. Indemnification. NRG Energy hereby agrees to indemnify and
hold harmless each Agent, each Lender and each of their Affiliates and their
officers, directors, employees, agents, advisors (including, without limitation,
the Advisors) and other representatives (each an "INDEMNIFIED PARTY") from and
against any and all claims, damages, losses, liabilities and expenses
(including, without limitation, reasonable fees and expenses of counsel) that
may be

                                       21


incurred by or asserted or awarded against any Indemnified Party, in each
case arising out of or in connection with or by reason of (including, without
limitation, in connection with any investigation, litigation or proceeding or
preparation of a defense in connection therewith) (a) this Second Collateral
Call Extension Letter or the Xcel Letter or (b) the Proposed Restructuring,
except to the extent such claim, damage, loss, liability or expense is found in
a final, nonappealable judgment by a court of competent jurisdiction to have
resulted directly and primarily from such Indemnified Party's gross negligence
or willful misconduct. In the case of an investigation, litigation or proceeding
to which the indemnity in this paragraph applies, such indemnity shall be
effective whether or not such investigation, litigation or proceeding is brought
by any NRG Party, any shareholder of any NRG Party, or any creditor of any NRG
Party or an Indemnified Party or an Indemnified Party is otherwise a party
thereto and whether or not the Proposed Restructuring is consummated. NRG Energy
further agrees that no Indemnified Party shall have any liability (whether
direct or indirect, in contract or tort or otherwise) to it or any of its
Subsidiaries or Affiliates or to its or their respective security holders or
creditors arising out of, related to or in connection with this Second
Collateral Call Extension Letter, the Xcel Letter or the Proposed Restructuring,
except for direct, as opposed to consequential, damages determined in a final
nonappealable judgment by a court of competent jurisdiction to have resulted
directly and primarily from such Indemnified Party's gross negligence or willful
misconduct.

                  14. Assignments and Participations. Each of the Lenders hereby
agrees that it will not assign or participate any of its rights or obligations
under any of the Agreements unless any such assignment or participation complies
with the provisions of such Agreement and any such assignee or participant has
agreed in writing to be bound by the terms hereof.

                  15. Confidentiality. Neither any Agent nor any Lender shall
disclose any Confidential Information (as defined below) to any Person without
the prior consent of NRG Energy, other than (a) to such Agent's or Lender's
Affiliates and their officers, directors, employees, agents, attorneys and
advisors and then only on a confidential basis, (b) as required by any law, rule
or regulation or judicial process, (c) as requested or required by any state,
Federal or foreign authority or examiner regulating such Lender, (d) to any
Lender or to any potential assignee or participant in respect of any Lender's
interest under any of the Agreements, (e) to any other Person to which such
Agent or Lender is permitted to disclose information pursuant to the
confidentiality provision contained in any Agreement and (e) to any rating
agency when required by it. "CONFIDENTIAL INFORMATION" means any information
that NRG Energy or any of its Subsidiaries furnishes to any Agent or Lender
pursuant to this Second Collateral Call Extension Letter in a writing designated
as confidential, but does not include any such information that is or becomes
generally available to the public (other than as a result of a breach by such
Agent or Lender of its obligations hereunder) or that is or becomes available to
such Agent or Lender from a source other then NRG Energy or any of its
Subsidiaries that is not, to the best of such Agent's or Lender's knowledge,
acting in violation of a confidentiality agreement with NRG Energy or such
Subsidiary.

                  16. Survival. Paragraphs l(b), 12, 13, 15, 18, 19 and 20 of
this Second Collateral Call Extension Letter shall survive any termination of
this Second Collateral Call Extension Letter or the occurrence of the Waiver
Termination Date. In addition, each representation and warranty made or deemed
to be made hereunder shall survive the making of such representation

                                       22


and warranty and no Agent or Lender shall be deemed to have waived, by reason of
entering into this Second Collateral Call Extension Letter any claim it may have
that may arise by reason of such representation or warranty proving to have been
false or misleading, notwithstanding that any such Agent or Lender may have had
notice or knowledge or reason to believe that such representation or warranty
was false or misleading at the time it was made.

                  17. Counterparts Etc. This Second Collateral Call Extension
Letter may be executed in any number of counterparts and by different parties
hereto in separate counterparts, each of which when so executed shall be deemed
to be an original and all of which taken together shall constitute one and the
same agreement. Delivery of an executed counterpart of a signature page to this
Second Collateral Call Extension Letter by telecopier shall be effective as
delivery of an original executed counterpart of this Second Collateral Call
Extension Letter.

                  18. Submission to Jurisdiction, Etc. Each of the parties
hereto hereby irrevocably and unconditionally submits, for itself and its
property, to the nonexclusive jurisdiction of ay New York State Court or Federal
court of the United States of America sitting in New York City, and any
appellate court from any thereof, in any action or proceeding arising out of or
relating to this Second Collateral Call Extension Letter or for recognition or
enforcement of any judgment, and each of the parties hereto hereby irrevocably
and unconditionally agrees that all claims in respect of any such action or
proceeding may be heard and determined in any such New York State court or, to
the fullest extent permitted by law, in such Federal court. Each of the parties
hereto agrees that a final judgment in any such action or proceeding shall be
conclusive and may be enforced in other jurisdictions by suit on the judgment or
in any other manner provided by law. Nothing in this Second Collateral Call
Extension Letter shall affect any right that any party may otherwise have to
bring any action or proceeding relating to this Second Collateral Call Extension
Letter in the courts of any jurisdiction. Each of the parties hereto irrevocably
and unconditionally waives, to the fullest extent it may legally and effectively
do so, any objection that it may now or hereafter have to the laying of venue of
any suit, action or proceeding arising out of or relating to this Second
Collateral Call Extension Letter in any New York State or Federal court. Each of
the parties hereto hereby irrevocably waives, to the fullest extent permitted by
law, the defense of an inconvenient forum to the maintenance of such action or
proceeding in any such court.

                  19. GOVERNING LAW. THIS SECOND COLLATERAL CALL EXTENSION
LETTER SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE
STATE OF NEW YORK.

                  20. WAIVER OF JURY TRIAL. EACH OF THE PARTIES HERETO
IRREVOCABLY WAIVES ALL RIGHT TO TRIAL BY JURY IN ANY ACTION, PROCEEDING OR
COUNTERCLAIM (WHETHER BASED ON CONTRACT, TORT OR OTHERWISE) ARISING OUT OF OR
RELATING TO THIS SECOND COLLATERAL CALL EXTENSION LETTER OR IN THE NEGOTIATION,
ADMINISTRATION, PERFORMANCE OR ENFORCEMENT THEREOF.






                                       23



                  If you agree to the terms and provisions of this Second
Collateral Call Extension Letter please evidence such agreement by executing and
returning at least five counterparts of this Second Collateral Call Extension
Letter to the attention of Elizabeth Nahm and Aaron Eddington at Simpson
Thacher & Bartlett, 425 Lexington Avenue, New York, New York, 10017.

                                Very truly yours,

                                NRG ENERGY, INC.

                                By: /s/ C. Adam Carte
                                   ------------------------------------------
                                   Name:  C. Adam Carte
                                   Title: Vice President, Treasurer & CFO






                                NRG POWER MARKETING INC.



                                /s/ Paul J. Bonavia
                                ----------------------------------------------
                                Name: Paul J. Bonavia
                                Title: Chairman, President & CEO








                                BRAZOS VALLEY ENERGY LP

                                By:  NRG Brazos Valley GP LLC, as general
                                     partner of Brazos Valley Energy LP


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name:  Richard C. Kelly
                                Title: President








                                BRAZOS VALLEY TECHNOLOGY LP

                                By: Brazos Valley Energy LP

                                By: NRG Brazos Valley GP LLC, as general
                                    partner

                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                CONEMAUGH POWER LLC




                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President













                                GRANITE POWER PARTNERS II, L.P.

                                By: NRG Granite Acquisition LLC, its general
                                    partner


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President












                                INDIAN RIVER POWER LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                KEYSTONE POWER LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                KILLINGHOLME GENERATION LIMITED


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: Director










                                KILLINGHOLME POWER LIMITED


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: Director










                                LSP-NELSON ENERGY, LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President











                                LSP-PIKE ENERGY, LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President





                                MIDATLANTIC GENERATION HOLDING
                                LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President






                                NRG AUDRAIN GENERATING LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President








                                NRG AUDRAIN HOLDING LLC



                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President









                                NRG BRAZOS VALLEY GP LP



                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                NRG BRAZOS VALLEY GP LLC



                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President



                                NRG BRAZOS VALLEY TECHNOLOGY LP LLC

                                By: Brazos Valley Energy LP, its sole member

                                By: NRG Brazos Valley GP LLC, its general
                                    partner


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                NRG CAPITAL LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                NRG ENERGY, INC.

                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President & Chief Operating Officer







                                NRG FINANCE COMPANY I LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President








                                NRG MCCLAIN LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President










                                NRG MIDATLANTIC GENERATING LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President










                                NRG MIDATLANTIC LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President







                                NRG NELSON TURBINES LLC


                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President










                                NRG TURBINES LLC

                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President









                                STERLING LUXEMBOURG (NO. 3) S.A.R.1.


                                By: NRGenerating Holdings (No. 15) B.V.

                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: Director








                                VIENNA POWER LLC

                                /s/ Richard C. Kelly
                                ----------------------------------------------
                                Name: Richard C. Kelly
                                Title: President










Agreed as of the date first above written:

OB BEHALF OF THE LENDERS UNDER THE FINCO CREDIT AGREEMENT

CREDIT SUISSE FIRST BOSTON,

NEW YORK BRANCH, as Administrative Agent


By: /s/ Carol Flaton
   ----------------------------------
Name: Carol Flaton
Title: Director



By: /s/ David L. Sawyer
   ----------------------------------
Name: David L. Sawyer
Title: Director




Agreed as of the date first above written:


ON BEHALF OF THE LENDERS UNDER THE NRG MCCLAIN CREDIT AGREEMENT

WESTDEUTSCHE LANDESBANK GIROZENTRALE,
NEW YORK BRANCH,
as Administrative Agent


By: /s/ Michael G. Pantelogianis
   ----------------------------------
Name: Michael G. Pantelogianis
Title: Associate Director


By: /s/ Jared Brenner
   ----------------------------------
Name: Jared Brenner
Title: Director











Agreed as of the date first above written:

ON BEHALF OF THE LENDERS UNDER THE NRG MIDATLANTIC LOAN AGREEMENT

JP MORGAN CHASE BANK, as Administrative Agent


By: /s/ Kimberly Turner
   ----------------------------------
Name: Kimberly Turner
Title: Vice President







Agreed as of the date first above written:

ON BEHALF OF THE LENDERS UNDER THE BRAZOS VALLEY CREDIT AGREEMENT

ABN AMRO BANK N.V.,
as Agent


By: /s/ Neil J. Bivona
   ----------------------------------
Name: Neil J. Bivona
Title: Group Vice President



By: /s/ Bryan J. Matthews
   ----------------------------------
Name: Bryan J. Matthews
Title: Corporate Banking Officer











Agreed as of the date first above written:

ON BEHALF OF THE LENDERS UNDER THE KILLINGHOLME FACILITY
AGREEMENT

BANC OF AMERICA SECURITIES LIMITED,
as Facility Agent


By: /s/ J. A. Onadney
   ----------------------------------
Name: J. A. Onadney
Title: Vice President






Agreed as of the date first above written:

ON BEHALF OF THE LENDERS UNDER THE ING ENTRADE FACILITY
AGREEMENT

ING BANK, N.V., organizacni slozka
As Facility Agent



By: /s/ Jan Struz
   ----------------------------------
Name: Jan Struz
Title: General Manager



By: /s/ Tomas Hlivka
   ----------------------------------
Name: Tomas Hlivka
Title: Risk Manager








                                                                      SCHEDULE A




                               CERTAIN DEFINITIONS

                  "AFFILIATE" means, with respect to any Person, any Person
that, directly or indirectly, controls, is controlled by or is under common
control with such Person; provided that (a) Xcel Energy shall be deemed to be an
Affiliate of NRG Energy and each of its Subsidiaries and (b) a Person shall be
deemed to be an Affiliate of any other Person if it possesses, directly or
indirectly, the power to vote 5% or more of the voting interests of such other
Person or the ability to direct or cause the direction of the management and
policies of such other Person, whether through the ownership of voting
interests, by contract or otherwise.

                  "BRAZOS VALLEY PROJECT" means that approximately 633 MW
combined cycle electric generating facility currently being developed by NRG
Energy and under construction near Fort Bend County, Texas.

                  "CAPITAL EXPENDITURE AGREEMENT" means, with respect to any
Person, any agreement relating to any Capital Expenditures to be made by such
Person.

                  "CAPITAL EXPENDITURES" means, with respect to any Person for
any period, any expenditure in respect of the purchase or other acquisition or
construction or expense of any fixed or capital asset (excluding normal
replacements and maintenance which are properly charged to current operations).

                  "CONTINGENT OBLIGATION" means, as to any Person, any direct or
indirect obligation of such Person, whether or not contingent, with or without
recourse, with respect to any Debt, lease, dividend, letter of credit or other
obligation (THE "PRIMARY OBLIGATION") of another Person (the "PRIMARY OBLIGER"),
including any obligation of such Person (a) to purchase, repurchase or otherwise
acquire such primary obligation or any security therefor, (b) to advance or
provide funds for the payment or discharge of any primary obligation, or to
maintain working capital or equity capital of the primary obligor or otherwise
to maintain the net worth or solvency or any balance sheet item, level of income
or financial condition of the primary obligor, (c) to purchase property,
securities or services primarily for the purpose of assuring the owner of any
primary obligation of the ability of the primary obligor to make payment of such
primary obligation or (d) otherwise to assure or hold harmless the holder of any
primary obligation against loss in respect thereof.

                  "DEBT" of any Person means all of the following: (a) all
obligations of such Person for borrowed money and all obligations of such Person
evidenced by bonds, debentures, notes, loan agreements or other similar
instruments; (b) all direct or contingent obligations of such Person arising
under letters of credit (including standby and commercial), bankers'
acceptances, bank guaranties, surety bonds and similar instruments; (c) net
obligations of such Person under any Swap Contract; (d) all obligations of such
Person to pay the deferred purchase price of property or services; (e)
indebtedness (excluding prepaid interest thereon) secured by an lien or any
similar encumbrance on property owned or being purchased by such Person
(including indebtedness arising under conditional sales or other title retention
agreements), whether or not such indebtedness shall have been assumed by such
Person or is limited in

                                  Schedule A-1






recourse; (f) any capital leases; and (g) all Contingent Obligations of such
Person with respect to any of the foregoing.

                  "DEBT INSTRUMENT" means, with respect to any Person, any
agreement, indenture, guaranty or other instrument to which such Person is a
party or issued by such Person in connection with any Debt incurred or to be
incurred by such Person.

                  "EVENT OF DEFAULT" means, with respect to any Debt Instrument
(including, any Agreement) any event (regardless of how defined in such Debt
Instrument) has occurred and is continuing after giving effect by any grace
period provided for in such Debt Instrument in respect thereto and such event
gives rise to the right of any lender or creditor to accelerate the Debt
outstanding under such Debt Instrument or take any other remedial action in
connection therewith, including, without limitation, the application of any
default interest rate.

                  "EXEMPTED PROJECT" is a collective reference to each of the
Brazos Valley Project, Meriden Project, Nelson Project (including the turbines
associated therewith) and Pike Project (including the turbines associated
therewith). NRG Energy may designate as an Exempted Project one or more
additional projects that, in its reasonable judgment, do not warrant continued
funding upon (a) the delivery of the Business Plan so long as the addition
thereof as Exempted Projects is consistent with the treatment thereof in the
Business Plan or (b) upon prior written notice with respect to such additional
project being given to the Agents.

                  "LEASE AGREEMENT" means, with respect to any Person, any lease
agreement in respect of any real property or any personal property which
involves aggregate lease payments payable by such Person in excess of $200,000
(or the currency equivalent thereof) or which is otherwise material to the
business, condition (financial or otherwise), operations, performance or
prospects of such Person.

                  "LIEN" means any mortgage, pledge, hypothecation, assignment,
deposit arrangement, encumbrance, lien (statutory or other), charge or other
security interest or any preference, priority or other security agreement or
preferential arrangement of any kind or nature whatsoever (including any
conditional sale or other title retention agreement and any capital lease having
substantially the same economic effect as any of the foregoing).

                  "MERIDEN PROJECT" means that approximately 540 MW combined
cycle electric generating facility currently being developed by NRG Energy under
construction near Meriden, Connecticut.

                  "NELSON PROJECT" means that approximately 1,168 MW combined
cycle electric generating facility currently being developed by NRG Energy and
under construction near Nelson Township, Illinois and certain costs of which
have been financed under the FinCo Credit Agreement.

                  "OTHER MATERIAL AGREEMENT" means, with respect to any Person,
any contract or agreement to which such Person is a party (other than any Debt
Instrument, Capital Expenditure Agreement or Lease Agreement) which involves
aggregate consideration payable to or by such Person in excess of $200,000 (or
the currency equivalent thereof) or which is otherwise material

                                  Schedule A-2






to the business, condition (financial or otherwise), operations, performance or
prospects of such Person.

                  "PERSON" means any natural person, corporation, limited
liability company, trust, joint venture, association, company, partnership,
governmental authority or other entity.

                  "PIKE PROJECT" means that approximately 1,168 MW combined
cycle electric generating facility currently being developed by NRG Energy and
under construction near Holmesville, Mississippi and certain costs of which have
been financed under the FinCo Credit Agreement.

                  "PROJECT SUBSIDIARY" means any Subsidiary which (a) has Debt
which is not fully recourse to NRG Energy or any other of its Subsidiaries, (b)
in a group of Subsidiaries which together have Debt which is not fully recourse
to NRG Energy or any other of its Subsidiaries or (c) is the owner of, or has
lent funds for the development and construction of, directly or indirectly, any
Exempted Project, including, without limitation, the Pike Project and the Nelson
Project.

                  "PUBLIC UTILITY HOLDING COMPANY ACT" means the Public Utility
Holding Company Act of 1935, as amended and any and all regulations and rules
promulgated thereunder.

                  "REQUIRED PERCENTAGE" means, with respect to any waiver or
amendment of any provision of any Agreement, the percentage of Lenders party to
such Agreement (or the related Primary Agreement) required to approve the
relevant amendment or waiver contemplated or, in the case of any waiver or
amendment of any provision of this Second Collateral Call Extension Letter or
the Xcel Letter, the percentage of Lenders party to each Primary Agreement
required to approve the Collateral Call Waiver.

                  "SUBSIDIARY" means, with respect to any Person, any
corporation, partnership, joint venture, limited liability company, trust or
estate of which (or in which) (a) 50% or more of (i) the issued and outstanding
capital stock having ordinary voting power to elect a majority of the board of
directors of such corporation (irrespective of whether at the time capital stock
of any other class or classes of such corporation shall or might have voting
power upon the occurrence of a contingency), (ii) the interest in the capital or
profits of such partnership, joint venture or limited liability company or (iii)
the beneficial interest in such trust or estate is at the time directly or
indirectly owned or controlled by such Person and one of more of its
Subsidiaries or by one or more of such Person's other Subsidiaries, in each
case, now or hereafter existing or (b) such Person directly or indirectly,
whether through contract or otherwise, exercises control.

                  "SWAP CONTRACT" means (a) any and all rate swap transactions,
basis swaps, credit derivative transactions, forward rate transactions,
commodity swaps, commodity options, forward commodity contracts, power and fuel
marketing and sales and purchase agreements, equity or equity index swaps or
options, bond or bond price or bond index swaps or options or forward bond or
forward bond price or forward bond index transactions, interest rate options,
forward foreign exchange transactions, cap transactions, floor transactions,
collar transactions, currency swap transactions, cross-currency rate swap
transactions, currency options, spot

                                  Schedule A-3






contracts, or any other similar transactions or any combination of any of the
foregoing (including any options to enter into any of the foregoing), whether or
not any such transaction is governed by or subject to any master agreement, and
(b) any and all transactions of any kind, and the related confirmations, which
are subject to the terms and conditions of, or governed by, any form of master
agreement published by the International Swaps and Derivatives Association,
Inc., any International Foreign Exchange Master Agreement, or any other master
agreement (any such master agreement, together with any related schedules, a
"MASTER AGREEMENT"), including any such obligations or liabilities under any
Master Agreement.

                  "WAIVER TERMINATION DATE" means the earlier to occur of (a)
November 15, 2002 and (b) the date on which the Second Collateral Call Extension
Letter terminates in accordance with paragraph 6 thereof.



                                  Schedule A-4






                                                                       EXHIBIT A
                                            [INSERT FORM OF XCEL ACKNOWLEDGMENT]








                                  Exhibit A-1









                                                                       EXHIBIT B
                                                    [INSERT FORM OF XCEL LETTER]







                                                                      SCHEDULE 1

                                NRG ENERGY, INC.
                         MINIMUM CASH BALANCE COVENANT
                             (AMOUNTS IN THOUSANDS)





                                           BASE FOR MINIMUM CASH
               WEEK                               BALANCE
          --------------                   ---------------------
                                        
          Sept 30- Oct 4                         131,212

          Oct 7-11                               116,378

          Oct 14-18                              107,951

          Oct 21-25                              103,607

          Oct 28 - Nov 1                          95,222

          Nov 4-8                                 90,121

          Nov 11-15                               84,990

          Nov 18-22                               82,002

          Nov 25-29                               76,660