AGREEMENT AND PLAN OF MERGER

Exhibit 2.1

AGREEMENT AND PLAN OF MERGER

by and among

CONSTELLATION ENERGY GROUP, INC.,

MIDAMERICAN ENERGY HOLDINGS COMPANY

and

MEHC MERGER SUB INC.

Dated as of September 19, 2008

TABLE OF CONTENTS

INDEX OF PRINCIPAL TERMS

      THIS AGREEMENT AND PLAN OF MERGER , dated as of September 19, 2008 (this “ Agreement ”), is entered into by and among Constellation Energy Group, Inc., a Maryland corporation (the “ Company ”), MidAmerican Energy Holdings Company, an Iowa corporation (the “ Parent ”), and MEHC Merger Sub Inc., a Maryland corporation and a wholly owned subsidiary of Parent (the “ Merger Sub ”).

      WHEREAS , the Company and the Parent have determined that it would be in each of their best interests and in the best interests of their respective shareholders, to effect the transactions contemplated by this Agreement;

      WHEREAS , in furtherance thereof, the respective Boards of Directors of the Company, the Parent and the Merger Sub have approved this Agreement and the merger of the Merger Sub with and into the Company whereby the Company will become a wholly owned subsidiary of the Parent (the “ Merger ”); and

      WHEREAS , contemporaneously with the execution and delivery of this Agreement, the parties hereto shall enter into a Series A Convertible Preferred Stock Purchase Agreement (the “ Securities Purchase Agreement ”) and an Investor Rights Agreement (the “ IRA ” and, collectively with the Securities Purchase Agreement, the “ Purchase Agreement ”).

      NOW , THEREFORE , in consideration of the premises and the representations, warranties, covenants and agreements contained herein, the parties hereto, intending to be legally bound hereby, agree as follows:

ARTICLE I.

THE MERGER

     Section 1.1. The Merger . Upon the terms and subject to the conditions of this Agreement, at the Effective Time (as defined in Section 1.3), the Merger Sub shall be merged with and into the Company in accordance with the laws of the State of Maryland and the separate existence of the Merger Sub shall cease. The Company shall be the Surviving Corporation (as defined below) in the Merger, shall continue its corporate existence under the laws of the State of Maryland and, following the Effective Time, the Company shall become a wholly owned subsidiary of the Parent and shall succeed to and assume all of the rights and obligations of the Merger Sub in accordance with the Maryland General Corporation Law, as amended (the “ MGCL ”). The effects and consequences of the Merger shall be as set forth in Section 1.2. The surviving corporation after the Merger is sometimes referred to herein as the “ Surviving Corporation .”

     Section 1.2. Effects of the Merger . At the Effective Time, (a) the charter of the Company in effect immediately prior to the Effective Time shall at the Effective Time be amended in its entirety to be the same as charter of the Merger Sub, as in effect immediately prior to the Effective Time, except that the name of the corporation shall be “Constellation Energy Group, Inc.”, and as so amended in its entirety shall be set forth on Attachment A to the Articles of Merger (as defined below) and shall be the charter of the Surviving Corporation until thereafter duly amended and (b) the Merger shall have all of the effects provided by the MGCL.

As of the Effective Time, each of the directors of the Company shall resign and the directors of the Merger Sub at the Effective Time shall, from and after the Effective Time, be the directors of the Surviving Corporation until their successors have been duly elected and qualified or until their earlier death, resignation or removal in accordance with the MGCL and the charter of the Surviving Corporation.

     Section 1.3. Effective Time of the Merger . Subject to the provisions of this Agreement, on the Closing Date (as defined in Section 3.1), articles of merger in a form mutually agreed by the parties (the “ Articles of Merger ”) shall be executed and filed by the Company and the Merger Sub with the State Department of Assessments and Taxation of Maryland (“ SDAT ”) pursuant to the MGCL. The Merger shall become effective upon the filing of the Articles of Merger with, and the acceptance of the Articles of Merger for record by, the SDAT or upon the effective time specified in Articles of Merger so filed, whichever is later (the “ Effective Time ”).

ARTICLE II.

TREATMENT OF SHARES

     Section 2.1. Effect on Stock of the Company and the Merger Sub . As of the Effective Time, by virtue of the Merger and without any action on the part of any holder of any of the capital stock of the Company or the Merger Sub:

     (a) Conversion of Stock of the Company . Each share of common stock, without par value, of the Company (the “ Company Common Stock ”) issued and outstanding as of the Effective Time (other than shares of Company Common Stock to be treated in accordance with Section 2.1(b)), shall be converted into the right to receive cash in the amount of $26.50 per share (the “ Merger Consideration ”), payable, without interest, to the holder of such share of Company Common Stock, upon surrender, in accordance with Section 2.3 hereof, of the certificate formerly representing such share.

     (b) Treatment of Certain Shares of Company Common Stock . Each share of Company Common Stock that is owned by the Parent or by any wholly owned Subsidiary (as defined in Section 4.1) of the Company or the Parent, in each case immediately prior to the Effective Time, shall remain outstanding and shall become that number of shares of common stock of the Surviving Corporation that bears the same ratio to the aggregate number of outstanding shares of the Surviving Corporation as the number of shares of Company Common Stock held by such entity bore to the aggregate number of outstanding shares of Company Common Stock immediately prior to the Effective Time.

     (c) Stock of the Merger Sub . Each share of common stock, par value $0.01 per share, of the Merger Sub issued and outstanding immediately prior to the Effective Time shall be converted into one share of the Surviving Corporation, which shall thereafter (together with the shares of common stock of the Surviving Corporation issued in accordance with Section 2.1(b)) constitute all of the issued and outstanding shares of common stock of the Surviving Corporation. No capital stock of the Merger Sub will be issued or used in the Merger.

     Section 2.2. Surrender of Certificates .

          (a) Deposit with Paying Agent . Prior to the Effective Time, the Parent shall designate a bank or trust company that is reasonably acceptable to the Company to act as agent (the “ Paying Agent ”) for the holders of shares of Company Common Stock in connection with the Merger to receive the funds to which holders of shares of Company Common Stock shall become entitled pursuant to Section 2.1(a). Such funds shall be deposited with the Paying Agent by the Parent immediately prior to or after the Effective Time and shall be invested by the Paying Agent as directed by the Parent; provided that, no investment of such deposited funds shall relieve the Parent, the Surviving Corporation or the Paying Agent from promptly making the payments required by this Article II, and following any losses from any such investment, the Parent shall promptly provide additional funds to the Paying Agent for the benefit of the holders of shares of Company Common Stock at the Effective Time in the amount of such losses, which additional funds will be held and disbursed in the same manner as funds initially deposited with the Paying Agent for payment of the Merger Consideration to holders of shares of Company Common Stock.

          (b) Exchange Procedures . As soon as practicable after the Effective Time, the Paying Agent shall mail to each holder of record of a certificate or certificates (the “ Certificates ”) which as of the Effective Time represented outstanding shares of Company Common Stock (the “ Cancelled Shares ”) that were converted into the right to receive the Merger Consideration pursuant to Section 2.1: (i) a letter of transmittal (which shall specify that delivery shall be effected, and risk of loss and title to the Certificates shall pass, only upon actual delivery of the Certificates (or affidavits of loss in lieu thereof) or book-entry shares (“ Book-Entry Shares ”) to the Paying Agent and such other provisions upon which the Parent and the Company may agree) and (ii) instructions for use in effecting the surrender of the Certificates (or affidavits of loss in lieu thereof) and Book-Entry Shares in exchange for the Merger Consideration. Upon surrender of a Certificate (or an affidavit of loss in lieu thereof) or Book-Entry Shares to the Paying Agent for cancellation (or to such other agent or agents as may be appointed by mutual agreement of the Parent and the Company), together with a duly executed letter of transmittal and such other documents as the Paying Agent may require, the holder of such Certificate or Book-Entry Shares shall be entitled to receive the Merger Consideration (after giving effect to any required tax withholdings as provided in Section 2.4) in exchange for each share of Company Common Stock formerly evidenced by such Certificate or Book-Entry Shares, which such holder has the right to receive pursuant to the provisions of this Article II. In the event of a transfer of ownership of Cancelled Shares which is not registered in the transfer records of the Company, the Merger Consideration may be delivered to a transferee if the Certificate (or affidavit of loss in lieu thereof) or Book-Entry Shares representing such Cancelled Shares is presented to the Paying Agent accompanied by all documents required to evidence and effect such transfer and by evidence satisfactory to the Paying Agent that any applicable Transfer Taxes (as defined in Section 7.13) have been paid. Until surrendered as contemplated by this Section 2.2, each Certificate (or affidavit of loss in lieu thereof) and Book-Entry Shares shall be deemed at any time after the Effective Time to represent only the right to receive upon such surrender the Merger Consideration as contemplated by this Section 2.2. No interest shall be paid or will accrue on the Merger Consideration payable to holders of Certificates or Book-Entry Shares pursuant to the provisions of this Article II.

          (c) Closing of Transfer Books; Rights of Holders of Company Common Stock . From and after the Effective Time, the Company Common Stock transfer books shall be closed and no registration of any transfer of such stock shall thereafter be made on the records of the Company. If, after the Effective Time, Certificates or Book-Entry Shares are presented to the Surviving Corporation, they shall be cancelled and exchanged for the Merger Consideration, as provided in this Section 2.2. From and after the Effective Time, the holders of shares of Company Common Stock outstanding immediately prior to the Effective Time shall cease to have any rights with respect to such shares of Company Common Stock, except as otherwise provided herein or by any applicable domestic or foreign laws, statutes, ordinances, rules (including rules of common law), regulations, codes, executive orders or legally enforceable requirements enacted, issued, adopted, promulgated or applied by any Governmental Authority (each, a “ Law ”).

          (d) Termination of Paying Agent . At any time commencing six months after the Effective Time, the Parent shall be entitled to require the Paying Agent to deliver to it any funds which had been made available to the Paying Agent and not disbursed to holders of shares of Company Common Stock (including, without limitation, all interest and other income received by the Paying Agent in respect of all funds made available to it), and thereafter such holders shall be entitled to look to the Surviving Corporation (subject to abandoned property, escheat and other similar Laws) only as general creditors thereof with respect to any Merger Consideration that may be payable upon due surrender of the Certificates held by them. Notwithstanding the foregoing, neither the Parent, the Surviving Corporation nor the Paying Agent shall be liable to any holder of a share of Company Common Stock for any Merger Consideration delivered in respect of such share to a public official pursuant to any abandoned property, escheat or other similar Law.

          (e) Lost, Stolen or Destroyed Certificates . In the event any Certificate shall have been lost, stolen or destroyed, upon the making of an affidavit of that fact by the holder of shares of Company Common Stock claiming such Certificate to be lost, stolen or destroyed and, if required by the Parent, the posting by such holder of a bond in customary amount and upon such terms as may be required by the Parent as indemnity against any claim that may be made against it or the Surviving Corporation with respect to such Certificate, the Paying Agent will pay the Merger Consideration (after giving effect to any required tax withholdings as provided in Section 2.4) to such holder in exchange for such lost, stolen or destroyed Certificate.

     Section 2.3. Treatment of Company Stock Awards .

          (a) Options . Prior to the Effective Time, the Company shall take all actions necessary to provide, effective as of the Effective Time, for the cancellation, on the terms and conditions set forth in this Section 2.3 and without any payment therefor except as otherwise provided in this Section 2.3, of all Company Employee Stock Options (as defined in Section 4.3(a)) (whether or not then exercisable) on Company Common Stock outstanding at the Effective Time. As of the Effective Time, each such Company Employee Stock Option (whether vested or unvested) shall be cancelled (and to the extent formerly so exercisable shall no longer be exercisable) and shall entitle each holder thereof, in cancellation and settlement therefor, to receive a payment, if any, in cash from the Company (less any applicable withholding taxes), promptly following the Effective Time, equal to (i) the amount, if any, by which the Merger

Consideration exceeds the exercise price per share with respect to such Company Employee Stock Options, multiplied by (ii) the total number of shares of Company Common Stock then issuable upon the exercise of such Company Employee Stock Options (whether or not then vested or exercisable).

          (b) Other Awards . Prior to the Effective Time, the Company shall take all actions necessary to provide, effective as of the Effective Time, for the cancellation, on the terms and conditions set forth in this Section 2.3(b) and without any payment therefor except as otherwise provided in this Section 2.3(b), of each award (the “ Company Awards ”) (including each share of Company Restricted Stock, and each Company Restricted Unit, stock equivalent and Company Performance Unit, but excluding Company Employee Stock Options) outstanding immediately before the Effective Time. As of the Effective Time, each such Company Award shall be cancelled and shall entitle each holder thereof, in cancellation and settlement therefor, to receive a payment in cash from the Company (less any applicable withholding taxes), promptly following the Effective Time, equal to (i) the Merger Consideration, multiplied by (ii) the total number of shares of Company Common Stock that would be issuable upon full vesting of such award or for which restrictions would lapse upon full vesting of such award; provided, that, notwithstanding anything in this sentence to the contrary, in the case of Company Performance Units, each outstanding Company Performance Unit that becomes vested at the Effective Time pursuant to the terms of the applicable Company Stock Plan (based upon the number of months from the start of the applicable performance period to the Effective Time) shall immediately vest at the Effective Time, with the holder of each such Company Performance Unit becoming entitled to receive, in full satisfaction of the rights of such holder with respect to such award (including any portion that remains unvested), an amount in cash equal to $2.00 (provided that (A) amounts payable pursuant to the cancellation of all outstanding Company Performance Units pursuant to this sentence shall be paid out within 30 days after the Effective Time without interest and (B) each outstanding Company Performance Unit that does not become vested at the Effective Time pursuant to the terms of the applicable Company Stock Plan shall expire at the Effective Time and the holder thereof shall be entitled to no further payments or benefits with respect thereto.

          (c) Required Action . At or prior to the Effective Time, the Company, the Board of Directors of the Company and the compensation committee of the Board of Directors of the Company, as applicable, shall adopt any resolutions and take any actions, including obtaining consents and acknowledgements of participants, which are necessary to effectuate the provisions of Section 2.3(a), (b) and (c). The Company shall take all commercially reasonable actions to ensure that from and after the Effective Time neither the Parent nor the Surviving Corporation will be required to deliver Company Common Stock or other capital stock of the Company to any Person pursuant to or in settlement of Company Employee Stock Options or Company Awards. The Company shall also take all action reasonably necessary to approve the disposition of the Company Employee Stock Options or Company Awards in accordance with this Section 2.3 so as to exempt such dispositions under Rule 16b-3 of the Securities Exchange Act of 1934, as amended (the “ Exchange Act ”).

     Section 2.4. Withholding Rights . Other than in respect of Transfer Taxes, which shall be governed by Section 7.13, each of the Surviving Corporation, the Company, the Parent and the Paying Agent shall be entitled to deduct and withhold from the Merger Consideration or

other payments made pursuant to this Agreement to any holder of shares of Company Common Stock, Company Employee Stock Options or Company Awards or other Person (as defined below) such amounts as it is required to deduct and withhold with respect to the making of such payment under the Internal Revenue Code of 1986, as amended (the “ Code ”), and the rules and regulations promulgated thereunder, or any provision of state, local or foreign Tax (as defined in Section 4.9) Law. To the extent that amounts are so withheld by the Surviving Corporation, the Company, the Parent or the Paying Agent, as the case may be, such withheld amounts shall be treated for all purposes of this Agreement as having been paid to the holder of the shares of Company Common Stock, Company Employee Stock Options or Company Awards or other Person in respect of which such deduction and withholding was made by the Surviving Corporation, the Company, the Parent or the Paying Agent, as the case may be. As used in this Agreement, the term “ Person ” shall mean any natural person, corporation, general or limited partnership, limited liability company, joint venture, trust, association or entity of any kind.

     Section 2.5. Adjustments to Prevent Dilution . In the event that the Company changes the number of shares of Company Common Stock or securities convertible or exchangeable into or exercisable for Company Common Stock issued and outstanding prior to the Effective Time as a result of a reclassification, stock split (including a reverse stock split), stock dividend or distribution, recapitalization, merger, issuer tender or exchange offer, or other similar transaction, the Merger Consideration shall be equitably adjusted.

ARTICLE III.

THE CLOSING

     Section 3.1. Closing . The closing of the Merger (the “ Closing ”) shall take place at the offices Willkie Farr & Gallagher LLP, 787 Seventh Avenue, New York, New York 10019 at 10:00 a.m., local time, on the third business day immediately following the date on which the last of the conditions set forth in Article VIII hereof is fulfilled or waived (other than any conditions that by their nature are to be satisfied at the Closing, but subject to the satisfaction or waiver of those conditions at the Closing), or at such other time, date and place as the Company and the Parent shall mutually agree (the “ Closing Date ”).

ARTICLE IV.

REPRESENTATIONS AND WARRANTIES OF THE COMPANY

     The Company represents and warrants to the Parent and the Merger Sub that except (i) as set forth in the letter, dated as of the date hereof, delivered by the Company to the Parent simultaneously with the execution and delivery of this Agreement (the “ Company Disclosure Letter ”), with specific reference to the particular Section or Subsection of this Agreement to which the information set forth in such letter relates (it being agreed that disclosure of any item in any Section or Subsection of the Company Disclosure Letter shall be deemed disclosure with respect to any other Section or Subsection to which the relevance of such item is reasonably apparent) or (ii) as and to the extent set forth in the Company SEC Reports (as defined in Section 4.5) filed on or after January 1, 2008 and prior to the date of this Agreement, to the extent the relevance of the disclosure is readily apparent (excluding, in each case, any disclosures set forth

in any risk factor section, in any forward looking statements (whether or not specifically identified as such), including future operating results and any other disclosures included thereon to the extent that they are cautionary, precatory or forward-looking in nature (provided that this clause (ii) shall not apply to Sections 4.1, 4.2, 4.3, 4.4(a), (b), (c) and (e), 4.16(b)(iii), 4.19, 4.20, 4.22, 4.24 and 4.26):

     Section 4.1. Organization and Qualification . The Company and each of the Company Subsidiaries (as defined below) and each Company Joint Venture (as defined in Section 4.2(c)(B)) is a corporation, limited liability company or limited partnership duly organized, validly existing and in good standing, as applicable, under the Laws the jurisdiction set forth opposite its name in Section 4.2 of the Disclosure Letter. The Company and each of the Company Subsidiaries and each Company Joint Venture has all requisite power and authority to own, lease and operate its assets and properties to the extent owned, leased and operated and to carry on its business as it is now being conducted and is duly qualified and in good standing to do business in each jurisdiction in which the nature of its business or the ownership or leasing of its assets and properties makes such qualification necessary other than in such jurisdictions where the failure to be so qualified or in good standing would not, individually or in the aggregate, reasonably be expected to result in a Company Material Adverse Effect (as defined below). As used in this Agreement, (a) the term “ Subsidiary ” of a Person shall mean any other Person of which at least a majority of the voting power represented by the outstanding stock or other voting securities or interests having voting power under ordinary circumstances to elect directors or similar members of the governing body of such corporation or entity or fifty percent (50%) or more of the equity interests in such corporation or entity shall at the time be owned or controlled, directly or indirectly, by such Person and/or by one or more of its Subsidiaries; (b) the term “ Company Subsidiary ” shall mean a Subsidiary of the Company and (c) the term “ Company Material Adverse Effect ” shall mean any event, change or occurrence or development of a set of circumstances or facts, which, individually or together with any other event, change, occurrence or development, has or would reasonably be expected to have a material adverse effect on the business, assets, liabilities, properties, financial condition or results of operations of the Company, the Company Subsidiaries or the Company Joint Ventures taken as a whole; provided, however, that the term “ Company Material Adverse Effect ” shall not include (i) any such effect relating to or resulting from general changes in the nuclear, electric or natural gas utility industry, other than such effects having a disproportionate impact on the Company as compared to similarly situated Persons, (ii) any such effect resulting from changes in Law or GAAP, other than such effects having a disproportionate impact on the Company as compared to similarly situated Persons, (iii) any such effect resulting from changes in financial markets or general economic conditions, other than such effects having a disproportionate impact on the Company as compared to similarly situated Persons, and (iv) any such effect resulting from the announcement of the execution of this Agreement (except to the extent that the Company has made an express representation with respect to the effect of such execution on the Company and the Company Subsidiaries and the Company Joint Ventures), including any such change resulting therefrom in the market value of the Company Common Stock; provided, however, that, notwithstanding any provision of this sentence to the contrary, (x) the occurrence of an Insolvency Event (as defined below) in respect of the Company or any Company Subsidiary or Company Joint Venture or (y) any event, change, occurrence or development that is reasonably likely to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement, shall be deemed to cause a Company Material Adverse Effect.

As used in this Agreement, the term “knowledge” when referring to the knowledge of the Company or any Company Subsidiary or any Company Joint Venture shall mean the actual knowledge of the Company officers listed on Section 4.1 of the Company Disclosure Letter as would have been acquired in the prudent exercise of their duties. As used in this Agreement, the term “ Insolvency Event ” means, with respect to any Person, the occurrence of any of the following:

     (a) such Person shall (A) (i) (voluntarily commence any proceeding or file any petition seeking relief under Title 11 of the United States Code, Sections 101 et. seq. (the “ Bankruptcy Code ”) or any other federal, state or foreign bankruptcy, insolvency, liquidation or similar Law, (ii) consent to the institution of, or fail to contravene in a timely and appropriate manner, any such proceeding or the filing of any such petition, (iii) apply for or consent to the appointment of a receiver, trustee, custodian, sequestrator or similar official for such Person or for a substantial part of its property or assets, (iv) file an answer admitting the material allegations of a petition filed against it in any such proceeding, (v) make a general assignment for the benefit of creditors or (vi) take any action for the purpose of effecting any of the foregoing or (B) such Person shall become unable, admit in writing its inability or fail generally to pay its debts as they become due; or

     (b) an involuntary proceeding shall be commenced or an involuntary petition shall be filed in a court of competent jurisdiction seeking (A) relief in respect of such Person or of a substantial part of the property or assets of such Person, under the Bankruptcy Code or any other federal, state or foreign bankruptcy, insolvency, receivership or similar Law, (B) the appointment of a receiver, trustee, custodian, sequestrator or similar official for such Person or for a substantial part of the property of such Person or (C) the winding-up or liquidation of such Person; and such proceeding or petition shall continue undismissed for 60 days or an order or decree approving or ordering any of the foregoing shall continue unstayed and in effect 30 days.

     Section 4.2. Subsidiaries; Corporate Documents .

          (a) Section 4.2(a)(i) the Company Disclosure Letter sets forth a complete list, as of the date hereof, of all of the Company Subsidiaries (other than Subsidiaries with de minimis assets and liabilities or that are dormant or inactive (“ Excluded Entities ”)) and the Company Joint Ventures and their respective jurisdictions of incorporation or organization and the jurisdictions in which they are qualified to do business, and Section 4.2(a)(ii) of the Company Disclosure Letter sets forth the ownership interest of the Company in each such Company Subsidiary and each such Company Joint Venture, as well as the ownership interest of any other Person or Persons in each such Company Subsidiary and each such Company Joint Venture (other than shares of 6.20 Trust Preferred Securities ($25 million liquidation amount per preferred security) of BGE Capital Trust II (the “ Trust Preferred ”), and the Company’s, such Company Subsidiaries’ and such Company Joint Ventures’ capital stock, Equity Interests (as defined in Section 4.2(c)(A)) or other direct or indirect ownership interest in any other Person other than securities in a publicly traded company held for investment by the Company or any of the Company Subsidiaries or Company Joint Ventures and consisting of less than 1% of the outstanding capital stock of such company. Except as set forth in Section 4.2(a)(iii) of the

Company Disclosure Letter, all of the issued and outstanding shares of capital stock or other voting securities or Equity Interests of each such Company Subsidiary and each such Company Joint Venture are duly authorized, validly issued, fully paid and nonassessable, and are owned, directly or indirectly, beneficially and of record by the Company free and clear of any mortgages, liens, security interests, pledges, charges, equities easements, rights of way, options, claims, restrictions or encumbrances of any kind (each a “ Lien ”).

          (b) Prior to the date hereof, the Company has made available to the Parent true, complete and correct copies of the Company’s and the Company Subsidiaries’ and Company Joint Ventures’ articles of incorporation and by-laws or comparable governing documents, each current as of the date hereof, and each as so made available is in full force and effect (other than those of Excluded Entities).

          (c) Section 4.2(c) of the Company Disclosure Letter sets forth as of the date of this Agreement (A) the name of the project associated with each such Company Joint Venture and (B) a brief description of the principal line or lines of business conducted by each such entity. For purposes of this Agreement:

          (A) “ Joint Venture ” of a Person shall mean any Person that is not a Subsidiary of such first Person, in which such first Person or one or more of its Subsidiaries owns directly or indirectly any share, capital stock, partnership, membership or similar interest of any Person or any option therefor (together, “ Equity Interests ”), other than Equity Interests that represent less than 5% of each class of the outstanding voting securities or other Equity Interests of such second Person; and

          (B) “ Company Joint Venture ” shall mean any Joint Venture of the Company, any of the Company Subsidiaries or any of the Company Joint Ventures in which the invested capital associated with the Company’s or the Company Subsidiaries’ interest exceeds $100,000,000; provided that, except with regard to Sections 4.1, 4.2(a), (b) and (d), 4.16(b)(i) and (iii), Constellation Energy Partners LLC shall not be deemed to be a Company Joint Venture or an Affiliate of the Company (except for purposes of Section 4.8).

          (d) Except for interests in the Company Subsidiaries, the Company Joint Ventures and investments acquired after the date of this Agreement without violating any covenant contained herein, the Company does not directly or indirectly own any shares of capital stock, other voting securities or Equity Interests or investments in any Person, in which the invested capital associated with such interest individually as of the date of this Agreement exceeds $1,000,000 individually or $25,000,000 in the aggregate for all such interests and investments, as reasonably determined by the Company.

     Section 4.3. Capital Stock .

          (a) The authorized capital stock of the Company consists of 600,000,000 shares of Company Common Stock, without par value, and 25,000,000 shares of preferred stock, par value $0.01 per share (the “ Company Preferred Stock ”). At the close of business on, September 17, 2008, (A) 178,425,915 shares of Company Common Stock were issued and outstanding, of which 866,625 shares were subject to future vesting requirements or risk of forfeiture back to the Company or a right of repurchase by the Company (collectively,

“ Company Restricted Stock ”) and (B) 7,866,057 shares of Company Common Stock were reserved and available for issuance pursuant to the 2002 Senior Management Long-Term Incentive Plan, Executive Long-Term Incentive Plan, Management Long-Term Incentive Plan, the 1995 Long-Term Incentive Plan and the 2007 Long Term Incentive Plan (such plans, collectively, the “ Company Stock Plans ”), of which 6,821,218 shares were subject to outstanding options to purchase shares of Company Common Stock with a weighted average exercise price of $62.69 per share (such outstanding options, together with any options to purchase shares of Company Common Stock granted after September 17, 2008, under the Company Stock Plans, the “ Company Employee Stock Options ”), and 270,052 shares of Company Common Stock were subject to restricted stock unit awards granted under the Company Stock Plans (such unit awards, together with any other restricted stock unit awards granted after September 17, 2008, the “ Company Restricted Units ”).

          (b) No shares of capital stock or other voting securities or Equity Interests of the Company were issued, reserved for issuance, outstanding or held by the Company in its treasury. As of the date of this Agreement, (A) except as set forth in Section 4.3(a), there were no outstanding options, stock appreciation rights, “phantom” stock rights, performance awards, units, dividend equivalent awards, rights to receive shares of Company Common Stock on a deferred basis, rights to purchase or receive Company Common Stock or other rights that are linked to the value of Company Common Stock issued or granted by the Company or any of the Company Subsidiaries or Company Joint Ventures to any current or former director, officer, employee or consultant of the Company or any of the Company Subsidiaries or Company Joint Ventures and (B) no shares of Company Restricted Stock or Company Restricted Units were subject to performance-based vesting criteria. All outstanding shares of Company Common Stock are, and all shares which may be issued pursuant to the exercise of Company Employee Stock Options and the vesting of Company Performance Units and Company Restricted Units will be, when issued in accordance with the terms thereof, duly authorized, validly issued, fully paid and nonassessable and not subject to or issued in violation of any purchase option, call option, right of first refusal, preemptive right, subscription right or any similar right under any provision of the MGCL, the articles of incorporation of the Company as in effect from time to time, the by-laws of the Company as in effect from time to time, or any contract to which the Company is a party or otherwise bound. During the period from September 17, 2008, to the date of this Agreement, there have been no issuances, reservations for issuance or grants by the Company or any of the Company Subsidiaries or Company Joint Ventures of any shares of capital stock (including Company Restricted Stock) or other voting securities or Equity Interests of the Company (other than issuances or grants of shares of Company Common Stock pursuant to (i) the Company Shareholder Investment Plan (the “ Company DRIP ”) and (ii) the Company Employee Savings Plan, the Company Represented Employee Savings Plan for Nine Mile Point and the Company Non-Represented Employee Savings Plan for Nine Mile Point (collectively, the “ Company Savings Plans ”) in the ordinary course of business consistent with past practice and (iii) the exercise of Company Employee Stock Options outstanding on September 17, 2008, as required by their terms as in effect on September 17, 2008).

          (c) There are no outstanding bonds, debentures, notes or other indebtedness of the Company or any of the Company Subsidiaries or Joint Ventures having the right to vote on any matters on which holders of capital stock or other Equity Interests of the Company or any of the Company Subsidiaries or Joint Ventures may vote (“ Company Voting Debt ”).

          (d) Except as set forth in Section 4.3(d) of the Company Disclosure Letter, as of the date of this Agreement, there are (A) no options, warrants, calls, rights, convertible or exchangeable securities, commitments, contracts, arrangements or undertakings of any kind to which the Company or any of the Company Subsidiaries or the Company Joint Ventures is a party or by which any of them is bound obligating the Company or any of the Company Subsidiaries or the Company Joint Ventures to issue, deliver or sell, or cause to be issued, delivered or sold, (1) shares of capital stock or other voting securities or Equity Interests of, or any security convertible or exercisable for or exchangeable into any capital stock or other voting securities or Equity Interests of, the Company or any of the Company Subsidiaries or the Company Joint Ventures or (2) any Company Voting Debt and (B) no other rights the value of which is in any way based on or derived from, or that give any person the right to receive any economic benefit or right similar to or derived from the economic benefits and rights accruing to holders of capital stock or other voting securities or Equity Interests of the Company or any of the Company Subsidiaries or the Company Joint Ventures. As of the date of this Agreement, there are no outstanding contractual obligations of the Company or any of the Company Subsidiaries or the Company Joint Ventures to repurchase, redeem or otherwise acquire any shares of capital stock of the Company or any of the Company Subsidiaries or the Company Joint Ventures.

          (e) None of the Company nor any of the Company Subsidiaries or the Company Joint Ventures is a party to any voting agreement with respect to the voting of any shares of capital stock or other voting securities or Equity Interests of the Company or any of the Company Subsidiaries or the Company Joint Ventures.

     Section 4.4. Authority; Non-Contravention; Statutory Approvals; Compliance .

          (a) Authority . The Company has all requisite corporate power and authority to enter into this Agreement and, subject to the receipt of the Company Shareholders’ Approval (as defined in Section 4.19) and the applicable Company Required Statutory Approvals (as defined in Section 4.4(c)), to consummate the transactions contemplated hereby. The execution and delivery of this Agreement and the consummation by the Company of the transactions contemplated hereby have been duly authorized by all necessary corporate action on the part of the Company, subject only to obtaining the Company Shareholders’ Approval. This Agreement has been duly executed and delivered by the Company and, assuming the due authorization, execution and delivery hereof by the other signatories hereto, constitutes the legal, valid and binding obligation of the Company enforceable against it in accordance with its terms, subject to bankruptcy, insolvency, fraudulent transfer, reorganization, moratorium and similar Laws of general applicability relating to or affecting creditors’ rights and to general equity principles.

          (b) Non-Contravention . The execution and delivery of this Agreement by the Company does not, and the consummation of the transactions contemplated hereby will not, violate or result in a breach of any provision of, constitute a material default (with or without notice or lapse of time or both) under, result in the termination or modification of, accelerate the performance required by, result in a right of termination, cancellation or acceleration of any obligation or the loss of a benefit under, or result in the creation of any Lien upon any of the properties or assets of the Company or any of the Company Subsidiaries or Company Joint Ventures (any such violation, breach, default, right of termination, modification, cancellation or

acceleration, loss or creation is referred to herein as a “ Violation ” with respect to the Company and such term when used in Article V has a correlative meaning with respect to the Parent) pursuant to any provisions of (i) any debt instruments relating to outstanding indebtedness for borrowed money in amounts in excess of $25 million, the articles of incorporation, by-laws or similar governing documents of the Company or any of the Company Subsidiaries or Company Joint Ventures, (ii) preferred stock and preference stock of any Company Subsidiary or Company Joint Venture, (iii) subject to obtaining the Company Required Statutory Approvals and the receipt of the Company Shareholders’ Approval, any order, judgment, injunction, award, decree or writ handed down, adopted or imposed by, including any consent decree, settlement agreement or similar written agreement with, any Governmental Authority (as defined in Section 4.4(c)) (each, an “ Order ”), authorization, license, consent, certificate, registration, approval or other permit of any Governmental Authority (each, a “ Permit ”) or Law applicable to the Company or any of the Company Subsidiaries or Company Joint Ventures or any of their respective properties or assets or (iv) subject to obtaining the third-party consents set forth in Section 4.4(b)(iv) of the Company Disclosure Letter (the “ Company Required Consents ”), any Material Contract (as defined in Section 4.16(b)) or material note, bond, mortgage, indenture, deed of trust, license, franchise, permit, concession, contract, lease or other instrument, obligation or agreement of any kind (collectively, “ Contracts ”) to which the Company or any of the Company Subsidiaries or Company Joint Ventures is a party or by which they or any of their respective properties or assets may be bound or affected, except in the case of clauses (iii) or (iv) for any such Violation which, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect or to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement.

     (c)  Statutory Approvals . Except for (A) compliance with, and filings under, the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the rules and regulations thereunder (the “ HSR Act ”); (B) the filing with and, to the extent required, the declaration of effectiveness by the U.S. Securities and Exchange Commission (the “ SEC ”) of (x) a Proxy Statement pursuant to the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “ Exchange Act ”) and (y) such reports under the Exchange Act as may be required in connection with this Agreement and the transactions contemplated hereby; (C) the filing of documents with various state securities authorities that may be required in connection with the transactions contemplated hereby; (D) the filing of an application to, and approval of, the Federal Energy Regulatory Commission (“ FERC ”) under Section 203 of the Federal Power Act, as amended (the “ FPA ”); (E) the filing of an application to, and consent and approval of, and transfer of or issuance of any required licenses and license amendments by, the Nuclear Regulatory Commission (the “ NRC ”) under the Atomic Energy Act of 1954, as amended (the “ Atomic Energy Act ”); (F) the filing of appropriate documents with the relevant authorities of other states in which the Company is qualified to do business; (G) the filing of the Articles of Merger and other appropriate merger documents required by the MGCL with the State Department of Assessments and Taxation of Maryland; (H) compliance with and any such filings as may be required under applicable Environmental Laws; (I) to the extent required, filings with, notice to and the approval of the Maryland Public Service Commission (“ MPSC ”); (J) required pre-approvals (the “ FCC Pre-Approvals ”) of license transfers with the Federal Communications Commission (the “ FCC ”); and (K) such other items as disclosed in Section 4.4(c) of the Company Disclosure Letter (the items set forth above in clauses

(A) through (K), the “ Company Required Statutory Approvals ”), (i) no Permit or Order or action of, registration, declaration or filing with or notice to any court, federal, state, local or foreign governmental or regulatory body (including a national securities exchange or other self-regulatory body), commission, agency, instrumentality, authority or other legislative, executive or judicial entity (each, a “ Governmental Authority ”), and (ii) except as set forth in Schedule 4.4(c)(ii) of the Company Disclosure Letter, no consent or approval is necessary or required to be obtained or made in connection with the execution and delivery of this Agreement by the Company, the performance by the Company of its respective obligations hereunder or the consummation of the Merger and the other transactions contemplated hereby by the Company, other than such items that the failure to make or obtain, as the case may be, individually or in the aggregate, would not reasonably be expected to have a Company Material Adverse Effect or to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement.

          (d) Compliance . None of the Company nor any of the Company Subsidiaries or Company Joint Ventures is in violation of, is, to the knowledge of the Company, under investigation with respect to any violation of, or has been given notice of or been charged with any violation of, any Law or Order of any Governmental Authority, except for any such violations which, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect or to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement. The Company and the Company Subsidiaries and Company Joint Ventures have all Permits, franchises and other governmental authorizations, consents and approvals necessary to conduct their businesses as presently conducted except those that the absence of which, individually and in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect or to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement. None of the Company, any of the Company Subsidiaries or Company Joint Ventures is in breach or violation of or in default in the performance or observance of any term or provision of, and no event has occurred which, with lapse of time or action by a third party, would reasonably be expected to result in a default by the Company, any Company Subsidiary or Company Joint Venture under (i) their respective articles of incorporation or by-laws or similar governing documents or the terms of any preferred stock or preference stock of any Company Subsidiary or Company Joint Venture or (ii) any contract, commitment, agreement, indenture, mortgage, loan agreement, note, lease, bond, license, approval or other instrument to which it is a party or by which the Company, any Company Subsidiary or Company Joint Venture is bound or to which any of their respective property is subject, except in the case of clause (ii) for possible violations, breaches or defaults which, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect or to prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement.

          (e) Board Approval . The Board of Directors of the Company has (A) determined that the Merger is fair to, and in the best interests of the Company, adopted and declared advisable this Agreement and the Merger and the other transactions contemplated hereby and resolved to recommend adoption of this Agreement to the holders of the Company Common Stock, (B) directed that the Merger contemplated by this Agreement be submitted to the holders of the Company Common Stock for their approval and (C) resolved to recommend

that the shareholders of the Company adopt this Agreement (the “ Company Board Recommendation ”).

     Section 4.5. Reports and Financial Statements . Since December 31, 2004, the Company and the Company Subsidiaries and Company Joint Ventures have filed or furnished, as applicable, on a timely basis (taking into account all applicable grace periods) all forms, statements, certifications, reports and documents required to be filed or furnished by them under the Securities Act of 1933, as amended (the “ Securities Act ”), the Exchange Act, the Public Utility Holding Company Act of 1935, as amended and in effect prior to its repeal effective February 8, 2006, the Energy Policy Act of 2005, the FPA, the Communications Act of 1934 as amended by the Telecommunications Act of 1996, the Atomic Energy Act, and applicable state public utility Laws (collectively, the “ Company Reports ”). The Company Reports have complied, as of their respective dates, or if not yet filed or furnished, will comply, with all applicable requirements of the appropriate statutes and the rules and regulations thereunder, except for such failures which, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect. As of their respective dates, (or, if amended prior to the date hereof, as of the date of such amendment), each form, certification, report, schedule, registration statement, definitive proxy statement or other document filed with or furnished to the SEC after December 31, 2004 by the Company (the “ Company SEC Reports ”), did not, or if not yet filed or furnished, will not, contain any untrue statement of a material fact or omit to state a material fact required to be stated therein or necessary to make the statements therein, in light of the circumstances under which they were made, not misleading. Each of the Company SEC Reports, at the time of its filing or being furnished, complied in all material respects, or if not yet filed or furnished, will comply in all material respects, with the applicable requirements of the Securities Act, the Exchange Act and the Sarbanes-Oxley Act of 2002 (“ SOX ”) and any rules and regulations promulgated thereunder applicable to the Company SEC Reports. The Company is in compliance in all material respects with the applicable listing and corporate governance rules and regulations of the New York Stock Exchange and the Chicago Stock Exchange. Each of the audited consolidated financial statements and unaudited interim financial statements of the Company included in or incorporated by reference into the Company SEC Reports (including the related notes and schedules) (collectively, the “ Company Financial Statements ”) has been, and in the case of Company SEC Reports filed after the date hereof will be, prepared in accordance with United States generally accepted accounting principles (“ GAAP ”), consistently applied during the periods involved (except as may be indicated therein or in the notes thereto and subject, in the case of unaudited statements, to normal year-end audit adjustments) and fairly presents, or, in the case of Company SEC Reports after the date hereof, will fairly present, the consolidated financial position of the Company and the Company Subsidiaries as of the dates thereof and the results of its operations and cash flows for the periods then ended, subject, in the case of the unaudited interim financial statements, to normal year-end audit adjustments.

     Section 4.6. Real Property .

          (a) The Company, the Company Subsidiaries and Company Joint Ventures have (x) good and marketable title to all real property owned in fee by them (the “ Owned Real Property ”) (y) valid title to the leasehold estate (as lessee) in all real property and interests in real property leased or subleased by them as lessee or sublessee (the “ Leased Real Property ”), and

(z) valid title to the easements in all real property and interests in real property over which any of them have easement (the “ Easement Real Property ” and, together with the Owned Real Property and Leased Real Property, the “ Real Property ”), in each case free and clear of all Liens, except the following (“ Permitted Real Property Liens ”):

          (i) Liens that secure indebtedness as reflected on the Company Financial Statements or indebtedness listed on Section 4.8 of the Company Disclosure Letter;

          (ii) easements, covenants, conditions, rights of way, encumbrances, restrictions, defects of title and other similar matters (other than such matters that, individually or in the aggregate, materially adversely impair the current use of the subject Real Property by the Company or the Company Subsidiaries or Company Joint Ventures);

          (iii) zoning, planning, building and other applicable Laws regulating the use, development and occupancy of real property and Permits, consents and rules under such Laws;

          (iv) Liens that have been placed by a third party on the fee title of Leased Real Property or Easement Real Property that are subordinate to the rights therein of the Company, any Company Subsidiary or Company Joint Venture or that, if foreclosed, would not materially adversely impair the conduct of the business of any of them at the subject Real Property as presently conducted; and

          (v) such other matters that, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect.

          (b) None of the Company, any of the Company Subsidiaries or Company Joint Ventures is obligated under, or a party to, any option, right of first refusal or other contractual right or obligation to sell, assign or dispose of any Real Property or any portion thereof or interest therein.

          (c) (i)  Each lease or sublease for real property under which Company, any of the Company Subsidiaries or Company Joint Ventures is a lessee or sublessee (each, a “ Real Property Lease ”) and each easement or subeasement for real property under which the Company, any of the Company Subsidiaries or Company Joint Ventures owns an easement interest (each, an “ Easement ”) is in full force and effect and is the valid and binding obligation of the Company, the Company Subsidiaries or Company Joint Ventures, enforceable against the Company, the Company Subsidiaries or Company Joint Ventures in accordance with its terms and, to the knowledge of the Company, the other party or parties thereto, subject to Permitted Real Property Liens, subject to the effect of any applicable bankruptcy, insolvency, reorganization, moratorium or similar Laws affecting rights of creditors generally and subject to the effect of general principles of equity (regardless of whether considered in a proceeding at Law or in equity), (ii) no notices of default under any Real Property Lease or Easement have been received by the Company, the Company Subsidiaries or Company Joint Ventures that have not been resolved, (iii) none of the Company, the Company Subsidiaries or Company Joint Ventures is in default

under any Real Property Lease, and, to the knowledge of the Company, no landlord, sublandlord, land owner or the owner of an easement who has granted a subeasement thereunder is in default in any material respect, and (iv) no event has occurred which, with notice, lapse of time or both, would constitute a breach or default under any Real Property Lease or Easement by the Company or the Company Subsidiaries or Company Joint Ventures, except in each case (i.e., clause (c)(i), (ii), (iii) and (iv)), as do not materially adversely impair the use or occupancy of the subject Real Property or prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement.

          (d) With respect to the Real Property, none of the Company, any of the Company Subsidiaries or Company Joint Ventures has received any written notice of, nor to the knowledge of the Company does there exist as of the date of this Agreement, any pending, threatened or contemplated condemnation or similar proceedings, or any sale or other disposition of any Real Property or any part thereof in lieu of condemnation that, individually or in the aggregate, would reasonably be expected to materially adversely impair the use, occupancy or value of any Real Property. The Company and the Company Subsidiaries and Company Joint Ventures have lawful rights of use and access to all land and other real property rights, subject to Permitted Real Property Liens, necessary to conduct their businesses substantially as presently conducted.

          (e) None of the Company, any of the Company Subsidiaries or Company Joint Ventures manage any real property owned or leased by a third party pursuant to a management agreement or otherwise.

          (f) The Company, the Company Subsidiaries and Company Joint Ventures, at and immediately following the Closing, will have all material easements, rights of way, licenses and use agreements necessary to conduct their respective businesses, consistent with past use and (ii) at and immediately following the Closing, there will not be any gaps, defects or deficiencies in the easements, rights of way, licenses and use agreements used in their respective businesses that would, individually or in the aggregate, materially impair or disrupt the conduct of such businesses (as such businesses have been conducted through the date hereof).

          (g) Other than the power generation facility in Alabama acquired by the Company in February 2008, and the plant currently under construction near Grande Prairie, Alberta, Canada, the Company, the Company Subsidiaries and Company Joint Ventures do not have any generation or processing facilities under construction or development.

     Section 4.7. Internal Controls and Procedures . The Company has established and maintains “disclosure controls and procedures” (as defined in Rules 13a-15(e) and 15d-15(e) promulgated under the Exchange Act) that are reasonably designed (but without making any representation or warranty as to the effectiveness of any such controls or procedures so designed) to ensure that material information (both financial and non-financial) relating to the Company and the Company Subsidiaries and Company Joint Ventures required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the rules and forms of the SEC, and that such information is accumulated and communicated to the Company’s principal executive officer and principal financial officer, or persons performing similar

functions, as appropriate, to allow timely decisions regarding required disclosure and to make the certifications of the “principal executive officer” and the “principal financial officer” of the Company required by Section 302 of SOX with respect to such reports. Each of the principal executive officer of the Company and the principal financial officer of the Company (or each former principal executive officer of the Company and each former principal financial officer of the Company, as applicable) has made all certifications required by Sections 302 and 906 of SOX and the rules and regulations promulgated thereunder with respect to the Company SEC Reports and the statements contained in such certifications are true and accurate in all material respects as of the date hereof. Except as set forth in Section 4.7 of the Company Disclosure Letter, there are no “significant deficiencies” or “material weaknesses” (as defined by SOX) in the design or operation of the Company’s internal controls and procedures which could adversely affect the Company’s ability to record, process, summarize and report financial data.

     Section 4.8. Litigation; Undisclosed Liabilities; Restrictions on Dividends . (a) There are no pending or, to the knowledge of the Company, threatened claims, suits, actions or proceedings before any court, governmental department, commission, agency, instrumentality or authority or any arbitrator, nor are there, to the knowledge of the Company, any investigations or reviews by any court, governmental department, commission, agency, instrumentality or authority or any arbitrator pending or threatened against, relating to or affecting the Company or any of the Company Subsidiaries or the Company Joint Ventures which have, individually or in the aggregate, resulted in or would reasonably be expected to result in a Company Material Adverse Effect or prevent, materially delay or materially impair the consummation of the transactions contemplated by this Agreement, (b) there have been no claims for indemnification or breach of warranty against the Company, any Company Subsidiary or any Company Joint Venture for amounts in excess of $25,000,000 with respect to the sale of a business, however effected by any of them, and which claims were unresolved at any time after December 31, 2006 and (c) there are no Orders of any Governmental Authority or any arbitrator applicable to the Company or any of the Company Subsidiaries or the Company Joint Ventures except for such that, individually or in the aggregate, have not resulted in or would not reasonably be expected to result in a Company Material Adverse Effect. Except for matters reflected as liabilities or reserved against in the balance sheet (or notes thereto) as of December 31, 2007, included in the Company Financial Statements, as of the date of this Agreement, none of the Company, any Company Subsidiary or Company Joint Venture has any liabilities or obligations (whether absolute, accrued, contingent, fixed or otherwise, or whether due or to become due) of any nature and whether or not required by GAAP to be reflected on a consolidated balance sheet of the Company and its consolidated Subsidiaries (including the notes thereto), except liabilities or obligations (i) that were incurred since December 31, 2007 in the ordinary course of business consistent in kind and amount with past practice, or (ii) that, individually or in the aggregate, have not had and would not reasonably be expected to have a Company Material Adverse Effect. Except as may be set forth in any Company Required Statutory Approval, there are no restrictions (contractual or regulatory) limiting the ability of any Company Subsidiary or Company Joint Venture from making distributions, dividends or other return of capital to the Company or another Company Subsidiary or Company Joint Venture owning capital stock therein. Neither the Company nor any Company Subsidiary or Company Joint Venture is a party to, or has any commitment to become a party to, any Joint Venture, off-balance sheet partnership or any similar contract or arrangement (including any contract relating to any transaction or relationship between or among the Company, any Company Subsidiary or Company Joint

Venture, on the one hand, and any unconsolidated Affiliate, including any structured finance, special purpose or limited purpose entity or person, on the other hand or any “off-balance sheet arrangements” (as defined in Item 303(a) of Regulation S-K of the SEC)), where the result, purpose or effect of such contract is to avoid disclosure of any material transaction involving, or material liabilities of, the Company, any of its Subsidiaries or Company Joint Ventures, in the Company’s, any Company Subsidiary’s or Company Joint Venture’s audited financial statements or other Company SEC Reports. As used in this Agreement, the term “ Affiliate ” means, with respect to any Person, any other Person that directly or indirectly controls, is controlled by or is under common control with, such first Person, where, for the purposes of this definition, “control” (including, with correlative meanings, the terms “controlling,” “controlled by” and “under common control with”), as applied to any Person, means the possession, directly or indirectly, of the power to direct or cause the direction of the management and policies of that Person, whether through the ownership of voting securities, by Contract or otherwise.

     Section 4.9. Tax Matters . Except as to matters that would not reasonably be expected, considered individually or in the aggregate with other matters, to result in a Company Material Adverse Effect: (i) the Company and each of the Company Subsidiaries and Company Joint Ventures have timely filed (or there have been filed on their behalf) with appropriate taxing authorities all Tax Returns (as defined below) required to be filed by them on or prior to the date hereof, such Tax Returns are correct, complete and accurate in all respects, and all Taxes (as defined below) due and payable have been paid; (ii) the Company has adequately provided in the Company Financial Statements and related records accruals or reserves for the payment of all Taxes and Tax liabilities payable by or with respect to the income, assets or operations of the Company, the Company Subsidiaries and Company Joint Ventures; (iii) there are no audits, claims, assessments, levies, administrative or judicial proceedings pending, or to the Company’s knowledge, threatened against the Company, any Company Subsidiary or Company Joint Venture by any taxing authority; (iv) there are no Liens for Taxes upon any property or assets of the Company or any of the Company Subsidiaries or Company Joint Ventures, except for Liens for Taxes (A) not yet due and payable, or if due and payable, are not delinquent and may thereafter be paid without penalty or (B) that are being contested in good faith through appropriate proceedings, are listed in Section 4.9 of the Company Disclosure Letter and have been accrued for or otherwise taken into account in accordance with GAAP on the Company Financial Statements; (v) there are no outstanding written requests, agreements, consents or waivers to extend the statutory period of limitations applicable to the assessment or collection of any Taxes or deficiencies against the Company, any of the Company Subsidiaries or Company Joint Ventures; (vi) all Taxes that the Company, any Company Subsidiary or Company Joint Venture is obligated to withhold from amounts owing to any employee, creditor or third party have been paid over to the appropriate taxing authorities in a timely manner, to the extent due and payable; (vii) none of the Company, any Company Subsidiary or Company Joint Venture has been a party to any transaction occurring during the two-year period prior to the date of this Agreement in which the parties to such transaction treated the transaction as one to which Section 355 of the Code applied, (viii) none of the Company, any Company Subsidiary or Company Joint Venture has participated in any “listed transactions” or, to the knowledge of the Company, any “reportable transactions” within the meaning of Treasury Regulations (as defined below) Section 1.6011-4, and none of the Company, any Company Subsidiary or Company Joint Venture has been a “material advisor” to any such transactions within the meaning of Section 6111 of the Code; (ix) none of the Company, any Company Subsidiary or Company

Joint Venture (A) has any liability for the Taxes of any Person (other than the Company or the Company Subsidiaries or Company Joint Ventures) under Treasury Regulation Section 1.1502-6 (or any similar provision of state, local or foreign Law), as a transferee or successor, or pursuant to any contractual obligation (other than pursuant to any commercial agreement or contract not primarily related to Tax) or (B) is a party to or bound by any Tax sharing agreement, Tax allocation agreement or Tax indemnity agreement (other than the Material Contracts or any commercial agreements or contracts not primarily related to Tax); (x) the Company has made available to the Parent correct and complete copies of all income and all other material Tax Returns, material examination reports and material statements of deficiencies assessed against or agreed to by the Company, any Company Subsidiary or Company Joint Venture for taxable periods beginning after December 31, 2003; (xi) no written claim has ever been made by any taxing authority in a jurisdiction where the Company, any Company Subsidiary or Company Joint Venture does not file Tax Returns that the Company, any Company Subsidiary or Company Joint Venture is or may be subject to taxation by that jurisdiction; (xii) neither the Company, any of the Company Subsidiaries or Company Joint Venture is a party to any agreement, contract, arrangement or plan that has resulted or could result, separately or in the aggregate, in the payment of (A) any “excess parachute payment” within the meaning of Section 280G of the Code (or any corresponding provision of state, local or foreign Tax Law), and (B) the disallowance of a deduction under Section 162(m) of the Code (or any corresponding provision of state, local or foreign Tax Law) for employee remuneration will not apply to any amount paid or payable by the Company, any Company Subsidiary or Company Joint Venture under any contract, benefit plan, program, arrangement or understanding currently in effect; and (xiii) the Company, the Company Subsidiaries and Company Joint Ventures, as applicable, have made proper elections under Section 475 of the Code with respect to the Company Trading Portfolio As used in this Agreement: (i) the term “ Tax ” includes all federal, state, local and foreign income, profits, franchise, gross receipts, environmental, customs duty, capital stock, severance, stamp, payroll, sales, employment, unemployment, disability, use, property, withholding, excise, utility, production, value added, occupancy, transfer, gains and other taxes, duties or assessments of any nature whatsoever, together with all interest, penalties and additions imposed with respect thereto; (ii) the term “ Tax Return ” includes all returns and reports (including elections, declarations, disclosures, schedules, estimates and information returns) required to be supplied to a Tax authority relating to Taxes, including any amendments to such returns and reports; and (iii) the term “ Treasury Regulations ” means the regulations promulgated by the U.S. Department of the Treasury pursuant to the Code.

     Section 4.10. Employee Benefits; ERISA .

          (a) Company Plans . For purposes of this Agreement, “ Company Plans ” shall mean each deferred compensation and each bonus or other incentive compensation, stock purchase, stock option and other equity compensation plan, program, policy, agreement or arrangement; each severance or termination pay, medical, surgical, hospitalization, life insurance and other “welfare plan,” fund or program (within the meaning of Section 3(1) of the Employee Retirement Income Security Act of 1974, as amended (“ ERISA ”)); each profit-sharing, stock bonus or other “pension plan,” fund or program (within the meaning of Section 3(2) of ERISA); each employment, termination or severance contract, arrangement, policy or agreement; and each other employee benefit plan, fund, program, policy, agreement or arrangement; in each case, that is sponsored, maintained or contributed to or required to be contributed to by the Company, any

Company Subsidiary or Company Joint Venture for the benefit of any employee or former employee of the Company, any Company Subsidiary or Company Joint Venture or with respect to which the Company, any Company Subsidiary or Company Joint Venture to its knowledge has any liability.

          (b) Deliveries . With respect to each Company Plan, the Company has heretofore delivered or made available or as soon as practicable following the date hereof shall deliver or make available to the Parent true and complete copies of (i) each of the Company Plans as currently in effect; (ii) if the Company Plan is funded through a trust or any third party funding vehicle, a copy of the trust or other funding agreement; (iii) the most recent determination or opinion letter received from the Internal Revenue Service with respect to each Company Plan intended to qualify under Section 401 of the Code; (iv) if applicable, the most recent annual report (Form 5500 series) filed with the Internal Revenue Service; (v) if applicable, the most recent actuarial report prepared for such Company Plan; and (vi) for the last three years, all material correspondence with the Internal Revenue Service, the United States Department of Labor, the Pension Benefit Guaranty Corporation (the “ PBGC ”), the SEC and any other Governmental Authority regarding the operation or the administration of any Company Plan.

          (c) Absence of Liability . No material liability under Title IV of ERISA has been incurred by the Company, any Company Subsidiary or Company Joint Venture or any trade or business, whether or not incorporated, that together with the Company, any Company Subsidiary or Company Joint Venture is deemed a “single employer” under Section 4001(b) of ERISA (an “ ERISA Affiliate ”) that has not been satisfied in full and or accrued in accordance with the terms of the applicable Company Plan, to the knowledge of the Company, no condition exists that presents a material risk to the Company, any Company Subsidiary or Company Joint Venture or any ERISA Affiliate of incurring any such liability, other than liability for premiums due to the PBGC (which premiums have been paid when due). No notice of a “reportable event,” within the meaning of Section 4043 of ERISA for which the reporting requirement has not been waived or extended, other than pursuant to PBGC Reg. Section 4043.33 or 4043.66, has been required to be filed for any Company Plan within the 12-month period ending on the date hereof or will be required to be filed in connection with the transactions contemplated by this Agreement. No notices have been required to be sent to participants and beneficiaries or the PBGC under Section 302 or 4011 of ERISA or Section 412 of the Code with respect to the most recent three fiscal years of the applicable Company Plan ended prior to the Closing Date.

          (d) Funding . No Company Plan subject to Title IV of ERISA (a “ Title IV Company Plan ”), has incurred any “accumulated funding deficiency” (as defined in Section 302 of ERISA and Section 412 of the Code), or failed to satisfy the minimum funding standard (within the meaning of Section 302 of ERISA or Sections 412 and 430 of the Code), in each case whether or not waived, as of the last day of the most recent fiscal year of such Title IV Company Plan ended prior to the Closing Date. Except as would not, individually or in the aggregate, reasonably be expected to have a Company Material Adverse Effect, all material contributions required to be made with respect to any Company Plan on or before the date hereof have been made and all obligations in respect of each Company Plan as of the date hereof have been accrued and reflected in the Company Financial Statements to the extent required by GAAP.

          (e) Multiemployer Plans . No Title IV Company Plan is a “multiemployer plan,” as defined in Section 4001(a)(3) of ERISA, nor is any Title IV Company Plan a plan described in Section 4063(a) of ERISA.

          (f) No Violations . Each Company Plan has been operated and administered in all material respects in accordance with its terms and applicable Law, including but not limited to ERISA and the Code. None of the Company, any Company Subsidiary or Company Joint Venture has engaged in a transaction with respect to any Company Plan that, assuming the taxable period of such transaction expired as of the date hereof, would subject the Company, any Company Subsidiary or Company Joint Venture to a tax or penalty imposed by either Section 4975 of the Code or Section 502(i) of ERISA in an amount which would be material to the Company, the Company Subsidiaries and Company Joint Ventures taken as a whole. None of the Company, any Company Subsidiary or Company Joint Venture has incurred or reasonably expects to incur a tax or penalty imposed by Section 4980 of the Code or Section 502 of ERISA or any liability under Section 4071 of ERISA, in any such case, in an amount which would be material to the Company, the Company Subsidiaries and Company Joint Ventures taken as a whole. To the knowledge of the Company, none of the Company, any Company Subsidiary or Company Joint Venture has any material liability with respect to any misclassification of any Person as an independent contractor rather than as an employee. Since January 1, 2005, each Company Plan that is subject to Section 409A of the Code has been administered in all material respects in good faith compliance with Section 409A of the Code.

          (g) Section 401(a) Qualification . Each Company Plan intended to be “qualified” within the meaning of Section 401(a) of the Code has received a determination letter from the Internal Revenue Service covering all tax Law changes prior to the Economic Growth and Tax Relief Reconciliation Act of 2001 or has remaining a period of time under the Code or applicable Treasury Regulations or Internal Revenue Service pronouncements in which to request, and make any amendments necessary to obtain, such a letter from the Internal Revenue Service; and the Company is not aware of any circumstances likely to result in the loss of the qualification of such Company Plan under Section 401(a) of the Code.

          (h) Plan Amendments . There has been no amendment to, announcement by the Company, any Company Subsidiary or any Company Joint Venture relating to, or change in employee participation or coverage under, any Company Plan which would increase materially the expense of maintaining such plan above the level of the expense incurred therefor for the most recently completed fiscal year of the Company or increase the benefits (whether retroactively or prospectively) payable under any Company Plan (except as required by applicable law).

          (i) Claims . There are no material pending, or to the knowledge of the Company threatened, material claims by or on behalf of any Company Plan, by any employee or beneficiary covered under any Company Plan, or otherwise involving any Company Plan (other than routine claims for benefits).

          (j) No Foreign Company Plans . All Company Plans subject to the laws of any jurisdiction outside of the United States (i) have been maintained in all material respects in accordance with all applicable requirements, (ii) if they are intended to qualify for special tax

treatment, meet all requirements for such treatment, and (iii) if they are intended to be funded and/or book-reserved, are fully funded and/or book reserved, as appropriate, based upon reasonable actuarial assumptions.

     Section 4.11. Labor and Employee Relations .

          (a) As of the date of this Agreement, except for employees represented by the International Brotherhood of Electrical Workers Union, Local 97 and the International Union of Operating Engineers, Locals 95-95A and 501 American Federation of Labor and Congress of Industrial Organizations, no employee of the Company, any of the Company Subsidiaries or Company Joint Ventures is represented by any union or covered by any collective bargaining agreement. No labor organization or group of employees of the Company, any of the Company Subsidiaries or Company Joint Ventures has made a pending demand for recognition or certification, and there are no representation or certification proceedings or petitions seeking a representation proceeding presently pending or, to the knowledge of the Company, threatened to be brought or filed, with the National Labor Relations Board or any other labor relations tribunal or authority;

          (b) there are no pending or, to the knowledge of the Company, threatened employee strikes, work stoppages, slowdowns, picketing or material labor disputes with respect to any employees of the Company, the Company Subsidiaries or Company Joint Ventures which, individually or in the aggregate, would reasonably be expected to result in a Company Material Adverse Effect, and during the past five years, none of the Company, the Company Subsidiaries or Company Joint Ventures has experienced any strike, work stoppage, lock-up, slow-down or other material labor dispute;

          (c) none of the Company, the Company Subsidiaries or Company Joint Ventures has to its knowledge, within the last two years, engaged in any unfair labor practice and there are no complaints against the Company, any of the Company Subsidiaries or Company Joint Ventures pending before the National Labor Relations Board or any similar state or local labor agency by or on behalf of any employee of the Company, any of the Company Subsidiaries or Company Joint Ventures ;

          (d) the Company, the Company Subsidiaries and Company Joint Ventures are  in compliance in all material respects with all federal and state Laws respecting employment and employment practices, terms and conditions of employment, collective bargaining, immigration, wages, hours and benefits, non-discrimination in employment, workers compensation, the collection and payment of withholding and/or payroll taxes and similar taxes (except for any non-compliance which, individually or in the aggregate, would not reasonably be expected to result in a Company Material Adverse Effect), including but not limited to the Civil Rights Act of 1964, the Age Discrimination in Employment Act of 1967, the Equal Employment Opportunity Act of 1972, the Employee Retirement Income Security Act of 1974, the Equal Pay Act, the National Labor Relations Act, the Americans with Disabilities Act of 1990, the Vietnam Era Veterans Reemployment Act, the Uniformed Services Employment and Reemployment Rights Act, the Family and Medical Leave Act and the Occupational Safety and Health Act of 1970 and any and all similar applicable state and local Laws;

          (e) each of the Company, the Company Subsidiaries and Company Joint Ventures is, and during the 90-day period prior to the date of this Agreement, has been in compliance in all material respects with the Worker Adjustment Retraining Notification Act of 1988, as amended (“ WARN Act ”), or any similar state or local Law.

     Section 4.12. [Intentionally Omitted]

     Section 4.13. Operations of Nuclear Power Plants. The operations of the nuclear generation stations owned or operated, in whole or part, by the Company, the Company Subsidiaries or any of the Company Joint Ventures, as applicable (collectively, the “ Company Nuclear Facilities ”) are and have been conducted in compliance with all applicable Laws and Permits, except for such failures to comply that, individually or in the aggregate, have not had and would not reasonably be expected to have a Company Material Adverse Effect. Each of the Company Nuclear Facilities maintains, and is in material compliance with, emergency plans designed to respond to an unplanned Release (as defined in Section 4.15(i)(iv)) therefrom of radioactive materials and each such plan conforms with the requirements of applicable Law in all material respects. The plans for the decommissioning of each of the Company Nuclear Facilities and for the storage of spent nuclear fuel conform with the requirements of applicable Law in all material respects and, solely with respect to the portion of the Company Nuclear Facilities owned, directly or indirectly, by the Company, the Company Subsidiaries or the Company Joint Ventures, the funding of decommissioning and storage of spent nuclear fuel is consistent with applicable Law. The operations of the Company Nuclear Facilities are not the subject of any outstanding notices of violation or requests for information from the NRC or any other agency with jurisdiction over such facility, except for such notices or requests for information that, individually or in the aggregate, have not had and would not reasonably be expected to have a Company Material Adverse Effect. No Company Nuclear Facility is listed by the NRC in the Unacceptable Performance column of the NRC Action Matrix as a part of the NRC’s Assessment of Licensee Performance. The Company, the Company Subsidiaries and the Company Joint Ventures each maintain liability insurance to the full extent required by Law for operating the Company Nuclear Facilities, and such insurance regarding such facilities remains in full force and effect in all material respects. All nuclear decommissioning funds established by the Company, the Company Subsidiaries and Company Joint Ventures that are intended to qualify under the provisions of Section 468A of the Code and the Treasury Regulations promulgated thereunder as “qualified nuclear decommissioning funds have satisfied (since formation) the requirements set forth in Treasury Regulations Section 1.468A-5.

     Section 4.14. Trading. The Company and each of the Company Subsidiaries and Company Joint Ventures, has established risk parameters, limits and guidelines, including daily value at risk and stop loss limits and liquidity guidelines, in compliance with the risk management policies approved by the Company’s corporate risk management committee (the “ Company Trading Guidelines ”), and the Company’s Board of Directors has approved VaR (as defined below) limits as set forth in Section 4.14 of the Company Disclosure Letter (the “ Company Approved VaR Limit ”). Compliance with the Company Trading Guidelines is monitored by the Senior Vice President and Chief Risk Officer of the Company and is periodically reviewed with the audit committee of the Board of Directors of the Company. The Company has provided the Company