TWO-YEAR CREDIT AGREEMENT

Exhibit 10.1

EXECUTION COPY

TWO-YEAR CREDIT AGREEMENT

Dated as of April 29, 2009

Among

THE DETROIT EDISON COMPANY,

as Borrower

and

THE INITIAL LENDERS NAMED HEREIN,

as Initial Lenders

and

BARCLAYS BANK PLC,

as Administrative Agent

and

and

BANK OF AMERICA, N.A.,

as Documentation Agent

as Co-Lead Arrangers and Joint Book Runners

TABLE OF CONTENTS

          This TWO-YEAR CREDIT AGREEMENT (this “ Agreement ”) dated as of April 29, 2009 is entered into among THE DETROIT EDISON COMPANY, a Michigan corporation (the “ Borrower ”), the banks, financial institutions and other institutional lenders (the “ Initial Lenders ”) listed on the signature pages hereof, and BARCLAYS BANK PLC (“ Barclays ”), as Administrative Agent (the “ Agent ”) for the Lenders (as hereinafter defined).

PRELIMINARY STATEMENT

          In consideration of the premises and the mutual covenants and agreements contained herein, the parties hereto hereby agree, subject to the satisfaction of the conditions set forth in Article III, as follows:

ARTICLE I

DEFINITIONS AND ACCOUNTING TERMS

          SECTION 1.01. Certain Defined Terms . As used in this Agreement, the following terms shall have the following meanings (such meanings to be equally applicable to both the singular and plural forms of the terms defined):

     “ Affiliate ” means, as to any Person, any other Person that, directly or indirectly, controls, is controlled by or is under common control with such Person or is a director or officer of such Person. For purposes of this definition, the term “control” (including the terms “controlling”, “controlled by” and “under common control with”) of a Person means the possession, direct or indirect, of the power to vote 25% or more of the Voting Stock of such Person or to direct or cause the direction of the management and policies of such Person, whether through the ownership of Voting Stock, by contract or otherwise.

     “ Agent ” has the meaning specified in the recital of parties to this Agreement.

     “ Agent’s Account ” means the account of the Agent maintained by the Agent at Barclays with its office at 200 Park Avenue, New York, NY 10166, Account No. 050-019104, Attention: Nicholas Guzzardo.

     “ Agents ” means the Agent and each Co-Syndication Agent, collectively.

     “ Agent Parties ” has the meaning specified in Section 8.02(b).

     “ Anti-Money Laundering Laws ” has the meaning specified in Section 4.01(p).

     “ Applicable Lending Office ” means, with respect to each Lender, such Lender’s Domestic Lending Office in the case of a Base Rate Advance and such Lender’s Eurodollar Lending Office in the case of a Eurodollar Rate Advance.

     “ Applicable Margin ” means, as of any date, (i) with respect to all Base Rate Advances, the percentage rate per annum which is applicable at such time with respect to Base Rate Advances as set forth in the Pricing Schedule, and (ii) with respect to all

Eurodollar Rate Advances, the percentage rate per annum which is applicable at such time with respect to Eurodollar Rate Advances as set forth in the Pricing Schedule.

     “ Applicable Percentage ” means, as of any date, the percentage rate per annum at which Facility Fees are accruing on each Lender’s Commitment (without regard to usage) at such time as set forth in the Pricing Schedule.

     “ Approved Fund ” means any Person (other than a natural person) that (a) is engaged in making, purchasing, holding or investing in bank loans and similar extensions of credit in the ordinary course of its business, (b) has a combined capital and surplus of at least $500,000,000, and (c) is administered or managed by (x) a Lender, (y) an Affiliate of a Lender or (z) an entity or an Affiliate of an entity that administers or manages a Lender.

     “ Arrangers ” means, collectively, RBS Securities Inc. and The Bank of Nova Scotia, in their capacities as co-lead arrangers and joint book runners for the credit facility evidenced by this Agreement.

     “ Assignment and Acceptance ” means an assignment and acceptance entered into by a Lender and an Eligible Assignee, and accepted by the Agent, in substantially the form of Exhibit C hereto.

     “ Audited Statements ” means the Consolidated balance sheets of the Borrower as at December 31, 2008, and the related Consolidated statements of income and cash flows of the Borrower for the fiscal year then ended, accompanied by the opinion thereon of the Borrower’s independent public accountants.

     “ Barclays ” has the meaning specified in the recital of parties to this Agreement.

     “ Base Rate ” means a fluctuating interest rate per annum equal to, for any day, the highest of:

     (a) the Prime Rate in effect on such day;

     (b) the Eurodollar Rate for a one month Interest Period on such day (or if such day is not a Business Day, the immediately preceding Business Day) plus 1%; or

     (c) 1/2 of 1% per annum above the Federal Funds Rate in effect on such day.

     “ Base Rate Advance ” means a Revolving Credit Advance that bears interest as provided in Section 2.06(a)(i).

     “ Borrower ” has the meaning specified in the recital of parties to this Agreement.

     “ Borrowing ” means a borrowing consisting of simultaneous Revolving Credit Advances of the same Type and (in the case of Eurodollar Rate Advances) having the same Interest Period, made by each of the Lenders pursuant to Section 2.01.

     “ Business Day ” means a day of the year on which banks are not required or authorized by law to close in New York City or Chicago, Illinois and, if the applicable Business Day relates to any Eurodollar Rate Advances, on which dealings are carried on in the London interbank market.

     “ Capitalization ” means the sum of (a) Total Funded Debt plus (b) Consolidated Net Worth.

     “ Commitment ” means, for each Lender, the obligation of such Lender to make Revolving Credit Advances to the Borrower in an aggregate amount not exceeding the amount set forth opposite such Lender’s name on Schedule I hereto or if such Lender has entered into any Assignment and Acceptance, set forth for such Lender in the Register maintained by the Agent pursuant to Section 8.07(d), as such amount may be modified from time to time pursuant to the terms hereof.

     “ Communications ” has the meaning specified in Section 8.02(b).

     “ Confidential Information ” means information that the Borrower furnishes to the Agent or any Lender designated as confidential, but does not include any such information that is or becomes generally available to the public or that is or becomes available to the Agent or such Lender from a source other than the Borrower.

     “ Consolidated ” refers to the consolidation of accounts in accordance with GAAP.

     “ Consolidated Net Worth ” means, as of any date of determination, the consolidated total stockholders’ equity, including capital stock (but excluding treasury stock and capital stock subscribed and unissued), additional paid-in capital and retained earnings (but excluding the Excluded Pension Effects) of the Borrower and its Subsidiaries determined in accordance with GAAP.

     “ Convert ”, “ Conversion ” and “ Converted ” each refers to a conversion of Revolving Credit Advances of one Type into Revolving Credit Advances of the other Type pursuant to Section 2.07 or 2.08.

     “ Co-Syndication Agents ” means, collectively, The Royal Bank of Scotland plc, Citibank, N.A., and JPMorgan Chase Bank, N.A., in their capacities as co-syndication agents for the credit facility evidenced by this Agreement.

     “ Credit Agreements ” means, collectively, this Agreement, the DTE Credit Agreement and the MichCon Credit Agreement.

     “ Debt ” of any Person means, without duplication, (a) all indebtedness of such Person for borrowed money, (b) all obligations of such Person for the deferred purchase price of property or services (other than trade payables not overdue by more than 60 days

incurred in the ordinary course of such Person’s business), (c) all obligations of such Person evidenced by notes, bonds, debentures or other similar instruments, (d) all obligations of such Person created or arising under any conditional sale or other title retention agreement with respect to property acquired by such Person (even though the rights and remedies of the seller or lender under such agreement in the event of default are limited to repossession or sale of such property), (e) all obligations of such Person as lessee under leases that have been or should be, in accordance with GAAP, recorded as capital leases, (f) all obligations, contingent or otherwise, of such Person in respect of acceptances, letters of credit or similar extensions of credit, (g) all obligations of such Person in respect of Hedge Agreements, (h) all Debt of others referred to in clauses (a) through (g) above or clause (i) below guaranteed directly or indirectly in any manner by such Person, or in effect guaranteed directly or indirectly by such Person through an agreement (1) to pay or purchase such Debt or to advance or supply funds for the payment or purchase of such Debt, (2) to purchase, sell or lease (as lessee or lessor) property, or to purchase or sell services, primarily for the purpose of enabling the debtor to make payment of such Debt or to assure the holder of such Debt against loss, (3) to supply funds to or in any other manner invest in the debtor (including any agreement to pay for property or services irrespective of whether such property is received or such services are rendered) or (4) otherwise to assure a creditor against loss (all such obligations under this clause (h) being “ Guaranteed Obligations ”), and (i) all Debt referred to in clauses (a) through (h) above secured by (or for which the holder of such Debt has an existing right, contingent or otherwise, to be secured by) any Lien on property (including, without limitation, accounts and contract rights) owned by such Person, even though such Person has not assumed or become liable for the payment of such Debt. See the definition of “Nonrecourse Debt” below.

     “ Default ” means any Event of Default or any event that would constitute an Event of Default but for the requirement that notice be given or time elapse or both.

     “ Defaulting Lender ” means any Lender, as determined by the Agent, that has (a) failed to fund any portion of its Revolving Credit Advances within three Business Days of the date required to be funded by it hereunder, unless the subject of a good faith dispute, (b) notified the Borrower, the Agent or any Lender in writing, or has otherwise indicated through a public statement, that it does not intend to comply with its funding obligations generally under agreements in which it commits to extend credit, (c) failed, within three Business Days after receipt of a written request from the Agent, to confirm that it will comply with the terms of this Agreement relating to its obligations to fund prospective Revolving Credit Advances, unless the subject of a good faith dispute, (d) otherwise failed to pay over to the Agent or any other Lender any other amount required to be paid by it hereunder within three Business Days of the date when due, unless the subject of a good faith dispute, or (e) become the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee, custodian, administrator, assignee for the benefit of creditors or similar Person charged with reorganization or liquidation of its business, appointed for it, or has taken any action in furtherance of, or indicating its consent to, approval of or acquiescence in any such proceeding or appointment or has a parent company that has become the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee, custodian, administrator, assignee for the benefit

of creditors or similar Person charged with reorganization or liquidation of its business, appointed for it, or has taken any action in furtherance of, or indicating its consent to, approval of or acquiescence in any such proceeding or appointment; provided that (i) if a Lender would be a “Defaulting Lender” solely by reason of events relating to a parent company of such Lender or solely because a Governmental Authority has been appointed as receiver, conservator, trustee or custodian for such Lender, in each case as described in clause (e) above, the Agent may, in its discretion, determine that such Lender is not a “Defaulting Lender” if and for so long as the Agent is satisfied that such Lender will continue to perform its funding obligations hereunder, (ii) subject to the last sentence of Section 2.17, the Agent and the Borrower, by joint notice to the Lenders, may declare that a Defaulting Lender is no longer a “Defaulting Lender” if the Agent and the Borrower each determines, in its sole respective discretion, that the circumstances that resulted in such Lender becoming a “Defaulting Lender” no longer apply, and (iii) a Lender shall not be a Defaulting Lender solely by virtue of the ownership or acquisition of Voting Stock or any other equity interest in such Lender or a parent company thereof by a Governmental Authority or an instrumentality thereof .

     “ Designating Lender ” has the meaning specified in Section 8.07(h).

     “ Disclosed Litigation ” has the meaning specified in Section 4.01(f).

     “ Domestic Lending Office ” means, with respect to any Lender, the office of such Lender specified as its “Domestic Lending Office” opposite its name on Schedule I hereto or in the Assignment and Acceptance pursuant to which it became a Lender, or such other office of such Lender as such Lender may from time to time specify to the Borrower and the Agent.

     “ DTE Energy ” means DTE Energy Company, a Michigan corporation.

     “ DTE Credit Agreement ” means that certain Two-Year Credit Agreement, dated as of the date hereof, by and among DTE Energy, as borrower, the financial institutions from time to time party thereto as lenders, and Citibank, N.A., as administrative agent for the lenders, as the same may be amended, restated, supplemented or otherwise modified from time to time.

     “ Effective Date ” has the meaning specified in Section 3.01.

     “ Eligible Assignee ” means (i) a Lender; (ii) an Affiliate of a Lender; (iii) a commercial bank organized under the laws of the United States, or any State thereof, and having a combined capital and surplus of at least $500,000,000; (iv) a savings and loan association or savings bank organized under the laws of the United States, or any State thereof, and having a combined capital and surplus of at least $500,000,000; (v) a commercial bank organized under the laws of any other country that is a member of the Organization for Economic Cooperation and Development or has concluded special lending arrangements with the International Monetary Fund associated with its General Arrangements to Borrow, or a political subdivision of any such country, and having a combined capital and surplus of at least $500,000,000, so long as such bank is acting

through a branch or agency located in the United States; (vi) the central bank of any country that is a member of the Organization for Economic Cooperation and Development; (vii) a finance company, insurance company or other financial institution or fund (whether a corporation, partnership, trust or other entity) that is engaged in making, purchasing or otherwise investing in commercial loans in the ordinary course of its business and having a combined capital and surplus of at least $500,000,000; (viii) an Approved Fund; and (ix) any other Person approved by the Agent and, so long as no Event of Default shall be continuing, the Borrower, such approval not to be unreasonably withheld or delayed by either party; provided , however , that neither the Borrower nor an Affiliate of the Borrower shall qualify as an Eligible Assignee.

     “ Environmental Action ” means any action, suit, demand, demand letter, claim, notice of non-compliance or violation, notice of liability or potential liability, investigation, proceeding, consent order or consent agreement relating in any way to any Environmental Law, Environmental Permit or Hazardous Materials or arising from alleged injury or threat of injury to the environment, including, without limitation, (a) by any governmental or regulatory authority for enforcement, cleanup, removal, response, remedial or other actions or damages and (b) by any governmental or regulatory authority or any third party for damages, contribution, indemnification, cost recovery, compensation or injunctive relief.

     “ Environmental Law ” means any federal, state, local or foreign statute, law, ordinance, rule, regulation, code, order, judgment, decree or judicial or agency interpretation, policy or guidance relating to pollution or protection of the environment or natural resources, including, without limitation, those relating to the use, handling, transportation, treatment, storage, disposal, release or discharge of Hazardous Materials.

     “ Environmental Permit ” means any permit, approval, identification number, license or other authorization required under any Environmental Law.

     “ ERISA ” means the Employee Retirement Income Security Act of 1974, as amended from time to time, and the regulations promulgated and rulings issued thereunder.

     “ ERISA Affiliate ” means any Person that for purposes of Title IV of ERISA is a member of the Borrower’s controlled group, or under common control with the Borrower, within the meaning of Section 414 of the Internal Revenue Code.

     “ ERISA Event ” means (a) (i) the occurrence of a reportable event, within the meaning of Section 4043 of ERISA, with respect to any Plan unless the 30-day notice requirement with respect to such event has been waived by the PBGC, or (ii) the requirements of subsection (1) of Section 4043(b) of ERISA (without regard to subsection (2) of such Section) are met with respect to a contributing sponsor, as defined in Section 4001(a)(13) of ERISA, of a Plan, and an event described in paragraph (9), (10), (11), (12) or (13) of Section 4043(c) of ERISA is reasonably expected to occur with respect to such Plan within the following 30 days; (b) the application for a minimum funding waiver with respect to a Plan; (c) the provision by the administrator of any Plan

of a notice of intent to terminate such Plan pursuant to Section 4041(a)(2) of ERISA (including any such notice with respect to a plan amendment referred to in Section 4041(e) of ERISA); (d) the cessation of operations at a facility of the Borrower or any ERISA Affiliate in the circumstances described in Section 4062(e) of ERISA; (e) the withdrawal by the Borrower or any ERISA Affiliate from a Multiple Employer Plan during a plan year for which it was a substantial employer, as defined in Section 4001(a)(2) of ERISA; (f) the conditions for the imposition of a lien under Section 302(f) of ERISA shall have been met with respect to any Plan; (g) the adoption of an amendment to a Plan requiring the provision of security to such Plan pursuant to Section 307 of ERISA; or (h) the institution by the PBGC of proceedings to terminate a Plan pursuant to Section 4042 of ERISA, or the occurrence of any event or condition described in Section 4042 of ERISA that constitutes grounds for the termination of, or the appointment of a trustee to administer, a Plan.

     “ Eurocurrency Liabilities ” has the meaning assigned to that term in Regulation D of the Board of Governors of the Federal Reserve System, as in effect from time to time.

     “ Eurodollar Lending Office ” means, with respect to any Lender, the office of such Lender specified as its “Eurodollar Lending Office” opposite its name on Schedule I hereto or in the Assignment and Acceptance pursuant to which it became a Lender (or, if no such office is specified, its Domestic Lending Office), or such other office of such Lender as such Lender may from time to time specify to the Borrower and the Agent.

     “ Eurodollar Rate ” means, for any Interest Period for each Eurodollar Rate Advance comprising part of the same Borrowing, an interest rate per annum equal to the rate per annum obtained by dividing (a) the rate appearing on Reuters Screen LIBOR01 Page (or on any successor or substitute page of the Service, or any successor to or substitute for the Service, providing rate quotations comparable to those currently provided on such page of the Service, as determined by the Agent after consultation with the Borrower from time to time for purposes of providing quotations of interest rates applicable to U.S. dollar deposits in the London interbank market) at approximately 11:00 A.M. (London time) two Business Days prior to the commencement of such Interest Period, as the rate for U.S. dollar deposits with a maturity comparable to such Interest Period, or in the event that such rate is not available at such time for any reason, the average (rounded upward to the nearest whole multiple of 1/16 of 1% per annum, if such average is not such a multiple) of the rate per annum at which deposits in U.S. dollars are offered by the principal office of each of the Reference Banks in London, England to prime banks in the London interbank market at 11:00 A.M. (London time) two Business Days before the first day of such Interest Period in an amount approximately equal to such Reference Bank’s Eurodollar Rate Advance comprising part of such Borrowing to be outstanding during such Interest Period and for a period equal to such Interest Period, by (b) a percentage equal to 100% minus the Eurodollar Rate Reserve Percentage for such Interest Period, subject , however , to the provisions of Section 2.07.

     “ Eurodollar Rate Advance ” means a Revolving Credit Advance that bears interest as provided in Section 2.06(a)(ii).

     “ Eurodollar Rate Reserve Percentage ” for any Interest Period for all Eurodollar Rate Advances comprising part of the same Borrowing means the reserve percentage applicable two Business Days before the first day of such Interest Period under regulations issued from time to time by the Board of Governors of the Federal Reserve System (or any successor) for determining the maximum reserve requirement (including, without limitation, any emergency, supplemental or other marginal reserve requirement) for a member bank of the Federal Reserve System in New York City with respect to liabilities or assets consisting of or including Eurocurrency Liabilities (or with respect to any other category of liabilities that includes deposits by reference to which the interest rate on Eurodollar Rate Advances is determined) having a term equal to such Interest Period.

     “ Events of Default ” has the meaning specified in Section 6.01.

     “ Excluded Pension Effects ” means the non-cash effects on Consolidated Net Worth resulting from the implementation of FASB Statement of Financial Accounting Standards No. 158, Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans, an amendment of FASB Statements No. 87, 88, 106, and 132(R), dated September 2006.

     “ Existing Credit Agreement ” means that certain Second Amended and Restated Five-Year Credit Agreement, dated as of October 17, 2005, by and among the Borrower, the financial institutions from time to time parties thereto as lenders, and Barclays, as Administrative Agent, as amended, restated, supplemented or otherwise modified from time to time.

     “ Facility Fee ” has the meaning specified in Section 2.03(a).

     “ Federal Funds Rate ” means, for any period, a fluctuating interest rate per annum equal for each day during such period to the weighted average of the rates on overnight federal funds transactions with members of the Federal Reserve System arranged by federal funds brokers, as published for such day (or, if such day is not a Business Day, for the next preceding Business Day) by the Federal Reserve Bank of New York, or, if such rate is not so published for any day that is a Business Day, the average of the quotations for such day on such transactions received by the Agent from three federal funds brokers of recognized standing selected by it.

     “ Financial Officer ” of any Person means the chief executive officer, president, chief financial officer, any vice president, controller, assistant controller, treasurer or any assistant treasurer of such Person.

     “ Funded Debt ” means, as to any Person, without duplication: (a) all Debt of such Person for borrowed money or which has been incurred in connection with the acquisition of assets (excluding (i) contingent reimbursement obligations in respect of letters of credit and bankers’ acceptances, (ii) Nonrecourse Debt, (iii) Junior Subordinated Debt, (iv) Mandatorily Convertible Securities, and (v) Hybrid Equity

Securities), (b) all capital lease obligations of such Person and (c) all Guaranteed Obligations of Funded Debt of other Persons.

     “ GAAP ” means generally accepted accounting principles in the United States of America.

     “ Governmental Authority ” means the government of the United States of America or any other nation, or of any political subdivision thereof, whether state or local, and any agency, authority, instrumentality, regulatory body, court, central bank or other entity exercising executive, legislative, judicial, taxing, regulatory or administrative powers or functions of or pertaining to government (including any supra-national bodies such as the European Union or the European Central Bank).

     “ Guaranteed Obligations ” has the meaning specified in clause (h) of the definition of “Debt”.

     “ Hazardous Materials ” means (a) petroleum and petroleum products, by-products or breakdown products, radioactive materials, asbestos-containing materials, polychlorinated biphenyls and radon gas and (b) any other chemicals, materials or substances designated, classified or regulated as hazardous or toxic or as a pollutant or contaminant under any Environmental Law.

     “ Hedge Agreements ” means interest rate swap, cap or collar agreements, interest rate future or option contracts, currency swap agreements, currency future or option contracts and other similar agreements.

     “ Hybrid Equity Securities ” means any securities issued by the Borrower or its Subsidiary or a financing vehicle of the Borrower or its Subsidiary that (i) are classified as possessing a minimum of “intermediate equity content” by S&P, Basket C equity credit by Moody’s, and 50% equity credit by Fitch and (ii) require no repayments or prepayments and no mandatory redemptions or repurchases, in each case, prior to at least 91 days after the later of the termination of the Commitments and the repayment in full of the Revolving Credit Advances and all other amounts due under this Agreement.

     “ Identified Reports on Form 8-K ” means those certain reports of the Borrower on Form 8-K filed or furnished with the Securities and Exchange Commission on January 27, February 23, February 24, March 5, March 6, and April 8, 2009.

     “ Initial Lenders ” has the meaning specified in the recital of parties to this Agreement.

     “ Interest Period ” means, for each Eurodollar Rate Advance comprising part of the same Borrowing, the period commencing on the date of such Eurodollar Rate Advance or the date of the Conversion of any Base Rate Advance into such Eurodollar Rate Advance and ending on the last day of the period selected by the Borrower pursuant to the provisions below and, thereafter, with respect to Eurodollar Rate Advances, each subsequent period commencing on the last day of the immediately preceding Interest Period and ending on the last day of the period selected by the Borrower pursuant to the

provisions below. The duration of each such Interest Period shall be one, two, three or six months, as the Borrower may, upon notice received by the Agent not later than 11:00 A.M. (New York City time) on the third Business Day prior to the first day of such Interest Period, select; provided , however , that:

     (i) the Borrower may not select any Interest Period that ends after the Termination Date then in effect;

     (ii) Interest Periods commencing on the same date for Eurodollar Rate Advances comprising part of the same Borrowing shall be of the same duration;

     (iii) whenever the last day of any Interest Period would otherwise occur on a day other than a Business Day, the last day of such Interest Period shall be extended to occur on the next succeeding Business Day, provided , however , that, if such extension would cause the last day of such Interest Period to occur in the next following calendar month, the last day of such Interest Period shall occur on the next preceding Business Day; and

     (iv) whenever the first day of any Interest Period occurs on a day of an initial calendar month for which there is no numerically corresponding day in the calendar month that succeeds such initial calendar month by the number of months equal to the number of months in such Interest Period, such Interest Period shall end on the last Business Day of such succeeding calendar month.

     “ Internal Revenue Code ” means the Internal Revenue Code of 1986, as amended from time to time, and the regulations promulgated and rulings issued thereunder.

     “ Junior Subordinated Debt ” means (a) subordinated junior deferrable interest debentures of the Borrower, (b) the related preferred securities, if applicable, of Subsidiaries of the Borrower and (c) the related subordinated guarantees, if applicable, of the Borrower, in each case, from time to time outstanding.

     “ Lender Supplement ” has the meaning specified in Section 2.04(c).

     “ Lenders ” means the Initial Lenders and each Person that shall become a party hereto pursuant to Section 8.07(a), (b) and (c).

     “ Lien ” means any lien, security interest or other charge or encumbrance of any kind, or any other type of preferential arrangement, including, without limitation, the lien or retained security title of a conditional vendor and any easement, right of way or other encumbrance on title to real property.

     “ Loan Documents ” means this Agreement and the Notes.

     “ Mandatorily Convertible Securities ” means any mandatorily convertible equity-linked securities issued by the Borrower or its Subsidiary, so long as the terms of such securities require no repayments or prepayments and no mandatory redemptions or repurchases, in each case prior to at least 91 days after the later of the termination of the

Commitments and the repayment in full of the Revolving Credit Advances and all other amounts due under this Agreement.

     “ Material Adverse Change ” means any material adverse change in the business, condition (financial or otherwise), operations, performance or properties of the Borrower and its Subsidiaries taken as a whole.

     “ Material Adverse Effect ” means a material adverse effect on (a) the business, condition (financial or otherwise), operations, performance or properties of the Borrower and its Subsidiaries taken as a whole, or (b) the ability of the Borrower to perform its obligations under any Loan Document to which it is a party.

     “ MichCon ” means Michigan Consolidated Gas Company, a Michigan corporation, wholly owned (indirectly) by DTE Energy.

     “ MichCon Credit Agreement ” means that certain Two-Year Credit Agreement, dated as of the date hereof, among MichCon, as borrower, the financial institutions from time to time parties thereto as lenders, and JPMorgan Chase Bank, N.A., as administrative agent for the lenders, as amended, restated, supplemented or otherwise modified from time to time.

     “ Moody’s ” means Moody’s Investors Service, Inc.

     “ Moody’s Rating ” is defined in the Pricing Schedule.

     “ Multiemployer Plan ” means a multiemployer plan, as defined in Section 4001(a)(3) of ERISA, to which the Borrower or any ERISA Affiliate is making or accruing an obligation to make contributions, or has within any of the preceding five plan years made or accrued an obligation to make contributions.

     “ Multiple Employer Plan ” means a single employer plan, as defined in Section 4001(a)(15) of ERISA, that (a) is maintained for employees of the Borrower or any ERISA Affiliate and at least one Person other than the Borrower and the ERISA Affiliates or (b) was so maintained and in respect of which the Borrower or any ERISA Affiliate could have liability under Section 4064 or 4069 of ERISA in the event such plan has been or were to be terminated.

     “ Nonrecourse Debt ” means Debt of the Borrower or any of its Subsidiaries in respect of which no recourse may be had by the creditors under such Debt against the Borrower or such Subsidiary in its individual capacity or against the assets of the Borrower or such Subsidiary, other than (a) to assets which were purchased or refinanced by the Borrower or such Subsidiary with the proceeds of such Debt, (b) to the proceeds of such assets, or (c) if such assets are held by a Subsidiary formed solely for such purpose, to such Subsidiary or the equity interests in such Subsidiary; provided that, for purposes of clarity, it is understood that Securitization Bonds shall constitute Nonrecourse Debt for all purposes of the Loan Documents, except to the extent (and only to the extent) of any claims made against the Borrower in respect of its indemnification obligations relating to such Securitization Bonds.

     “ Note ” has the meaning specified in Section 2.16.

     “ Notice of Borrowing ” has the meaning specified in Section 2.02(a).

     “ Obligations ” means all unpaid principal of and accrued and unpaid interest on Revolving Credit Advances, all accrued and unpaid fees and all expenses, reimbursements, indemnities and other obligations of the Borrower to the Lenders or to any Lender, the Agent or any indemnified party arising under the Loan Documents.

     “ OFAC ” has the meaning specified in Section 4.01(o).

     “ Other Taxes ” has the meaning specified in Section 2.13(b).

     “ PBGC ” means the Pension Benefit Guaranty Corporation (or any successor).

     “ Person ” means an individual, partnership, corporation (including a business trust), joint stock company, trust, unincorporated association, joint venture, limited liability company or other entity, or a government or any political subdivision or agency thereof.

     “ Plan ” means a Single Employer Plan or a Multiple Employer Plan.

     “ Platform ” has the meaning specified in Section 8.02(b).

     “ Pricing Schedule ” means the Pricing Schedule identifying the Applicable Margin and the Applicable Percentage attached hereto identified as such.

     “ Prime Rate ” means the rate of interest per annum established by Barclays in New York, New York, from time to time, as Barclays’ prime rate or base rate.

     “ Property ” of a Person means any and all property, whether real, personal, tangible, intangible, or mixed, of such Person, or other assets owned by such Person.

     “ Pro Rata Share ” means, with respect to a Lender, a portion equal to a fraction the numerator of which is such Lender’s Commitment and the denominator of which is the aggregate of all the Lenders’ Commitments; provided that, in the case of Section 2.17 when a Defaulting Lender shall exist (other than, for purposes of clarity, a Lender that is attempting to cure its “Defaulting Lender” status pursuant to the last sentence of Section 2.17), “Pro Rata Share” shall mean a portion equal to a fraction the numerator of which is such Lender’s Commitment and the denominator of which is the aggregate of all the Lender’s Commitments (disregarding any such Defaulting Lender’s Commitment). If the Commitment has terminated or expired, the Pro Rata Shares shall be determined based upon the Commitments most recently in effect, giving effect to any assignments and to any Lender’s status as a Defaulting Lender at the time of determination.

     “ Receivables Purchase Documents ” means those documents entered into in connection with any series of receivables purchase or sale agreements generally consistent with terms contained in comparable structured finance transactions pursuant to

which the Borrower or any of its Subsidiaries, in their respective capacities as sellers or transferors of any receivables, sell or transfer to SPCs all of their respective rights, title and interest in and to certain receivables for further sale or transfer to other purchasers of or investors in such assets (and the other documents, instruments and agreements executed in connection therewith), as any such agreements may be amended, restated, supplemented or otherwise modified from time to time, or any replacement or substitution therefor.

     “ Receivables Purchase Facility ” means any securitization facility made available to the Borrower or any of its Subsidiaries, pursuant to which receivables of the Borrower or any of its Subsidiaries are transferred to one or more SPCs, and thereafter to certain investors, pursuant to the terms and conditions of the Receivables Purchase Documents.

     “ Reference Banks ” means Citibank, N.A., Barclays, JPMorgan Chase Bank, N.A. and their respective successors.

     “ Register ” has the meaning specified in Section 8.07(d).

     “ Required Lenders ” means, subject to Section 2.17, at any time, Lenders owed more than fifty percent (50%) of the then-aggregate unpaid principal amount of the Revolving Credit Advances owing to the Lenders, or, if no such principal amount is then outstanding, Lenders having more than fifty percent (50%) of the Commitments.

     “ Revolving Credit Advance ” means an advance by a Lender to the Borrower as part of a Borrowing, and refers to a Base Rate Advance or a Eurodollar Rate Advance (each of which shall be a “ Type ” of Revolving Credit Advance).

     “ S&P ” means Standard & Poor’s Ratings Services, a division of the McGraw-Hill Companies, Inc.

     “ S&P Rating ” is defined in the Pricing Schedule.

     “ SEC Reports ” means the following reports and financial statements:

     (i) the Borrower’s Annual Report on Form 10-K for the year ended December 31, 2008, as filed with or sent to the Securities and Exchange Commission, including the Audited Statements of the Borrower; and

     (ii) the Identified Reports on Form 8-K.

     “ Service ” means Reuters Monitor Money Rate Service.

     “ Securitization Bonds ” means Debt of one or more Securitization SPEs, issued pursuant to The Customer Choice and Electricity Reliability Act, Act No. 142, Public Acts of Michigan, 2000, as the same may be amended from time to time.

     “ Securitization SPE ” means an entity established or to be established by the Borrower for the purpose of issuing Securitization Bonds and includes The Detroit

Edison Securitization Funding LLC, a limited liability company organized under the laws of the State of Michigan.

     “ Significant Subsidiary ” means any Subsidiary of the Borrower (A) the total assets (after intercompany eliminations) of which exceed 30% of the total assets of the Borrower and its Subsidiaries or (B) the net worth of which exceeds 30% of the Consolidated Net Worth, in each case as shown on the audited Consolidated financial statements of the Borrower as of the end of the fiscal year immediately preceding the date of determination.

     “ Single Employer Plan ” means a single employer plan, as defined in Section 4001(a)(15) of ERISA, that (a) is maintained for employees of the Borrower or any ERISA Affiliate and no Person other than the Borrower and the ERISA Affiliates or (b) was so maintained and in respect of which the Borrower or any ERISA Affiliate could have liability under Section 4069 of ERISA in the event such plan has been or were to be terminated.

     “ SPC ” means any special purpose entity established for the purpose of purchasing receivables in connection with a receivables securitization transaction permitted under the terms of this Agreement.

     “ SPV ” has the meaning specified in Section 8.07(h).

     “ Subsidiary ” of any Person means any corporation, partnership, joint venture, limited liability company, trust or estate of which (or in which) more than 50% of (a) 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 any contingency), (b) the interest in the capital or profits of such limited liability company, partnership or joint venture or (c) the beneficial interest in such trust or estate is at the time directly owned or controlled by such Person, by such Person and one or more of its other Subsidiaries or by one or more of such Person’s other Subsidiaries.

     “ Taxes ” has the meaning specified in Section 2.13(a).

     “ Terminating Agreements ” means, collectively, (a) the Existing Credit Agreement, (b) that certain Second Amended and Restated Five-Year Credit Agreement, dated as of October 17, 2005, by and among DTE Energy, as borrower, the financial institutions from time to time parties thereto as lenders, and Citibank, N.A., as Administrative Agent, as amended, restated, supplemented or otherwise modified from time to time, and (c) that certain Second Amended and Restated Five-Year Credit Agreement, dated as of October 17, 2005, by and among MichCon, as borrower, the financial institutions from time to time parties thereto as lenders, and JPMorgan Chase Bank, N.A., as Administrative Agent, as amended, restated, supplemented or otherwise modified from time to time.

     “ Termination Date ” means the earlier of (a) April 29, 2011, and (b) the date of termination in whole of the Commitments pursuant to Section 2.04 or 6.01.

     “ Total Funded Debt ” means all Funded Debt of the Borrower and its Consolidated Subsidiaries, on a consolidated basis, as determined in accordance with GAAP.

     “ 2005 DTE Credit Agreement ” means that certain Five-Year Credit Agreement dated as of October 17, 2005, by and among DTE Energy, the lenders party thereto, and Citibank, N.A., as Administrative Agent, as the same may be amended, restated, supplemented or otherwise modified from time to time.

     “ 2005 Five-Year Agreement ” means that certain Five-Year Credit Agreement dated as of October 17, 2005, by and among the Borrower, the lenders party thereto, and Barclays, as Administrative Agent, as the same may be amended, restated, supplemented or otherwise modified from time to time.

     “ Voting Stock ” means capital stock issued by a corporation, or equivalent interests in any other Person, the holders of which are ordinarily, in the absence of contingencies, entitled to vote for the election of directors (or persons performing similar functions) of such Person, even if the right so to vote has been suspended by the happening of such a contingency.

     “ Withdrawal Liability ” has the meaning specified in Part I of Subtitle E of Title IV of ERISA.

          SECTION 1.02. Computation of Time Periods . In this Agreement in the computation of periods of time from a specified date to a later specified date, the word “from” means “from and including” and the words “to” and “until” each mean “to but excluding”.

          SECTION 1.03. Accounting Terms . Except as otherwise expressly provided herein, all terms of an accounting or financial nature shall be construed in accordance with GAAP, as in effect from time to time; provided that, if the Borrower notifies the Agent that the Borrower requests an amendment to any provision hereof to eliminate the effect of any change occurring after the date hereof in GAAP or in the application thereof on the operation of such provision (or if the Agent notifies the Borrower that the Required Lenders request an amendment to any provision hereof for such purpose), regardless of whether any such notice is given before or after such change in GAAP or in the application thereof, then such provision shall be interpreted on the basis of GAAP as in effect and applied immediately before such change shall have become effective until such notice shall have been withdrawn or such provision amended in accordance herewith. Notwithstanding any other provision contained herein, all terms of an accounting or financial nature used herein shall be construed, and all computations of amounts and ratios referred to herein shall be made, without giving effect to any election under Statement of Financial Accounting Standards 159 (or any other Financial Accounting Standard having a similar result or effect) to value any Debt or other liabilities of DTE Energy or any of its Subsidiaries at “fair value”, as defined therein.

ARTICLE II

AMOUNTS AND TERMS OF THE REVOLVING CREDIT ADVANCES

          SECTION 2.01. Commitment . Each Lender severally agrees, on the terms and conditions hereinafter set forth, to make Revolving Credit Advances to the Borrower from time to time on any Business Day during the period from the Effective Date until the Termination Date in an aggregate amount not to exceed at any time outstanding such Lender’s Commitment. Each Borrowing shall be in an aggregate amount of $5,000,000 or an integral multiple of $1,000,000 in excess thereof, or the remaining balance of Commitments available for a Borrowing, if such balance is less than $5,000,000, and shall consist of Revolving Credit Advances of the same Type made on the same day by the Lenders ratably according to their respective Commitments. Within the limits of each Lender’s Commitment, the Borrower may borrow under this Section 2.01, prepay pursuant to Section 2.09 and reborrow under this Section 2.01.

          SECTION 2.02. Making the Revolving Credit Advances .

          (a) Each Borrowing shall be made on notice, given not later than 11:00 A.M. (New York City time) on the third Business Day prior to the date of the proposed Borrowing in the case of a Borrowing consisting of Eurodollar Rate Advances, or 10:00 A.M. (New York City time) on the Business Day of the proposed Borrowing in the case of a Borrowing consisting of Base Rate Advances, by the Borrower to the Agent, which shall give to each Lender prompt notice thereof by telecopier or telex. Each such notice of a Borrowing (a “ Notice of Borrowing ”) shall be by telephone, confirmed immediately in writing signed by a Financial Officer in substantially the form of Exhibit B hereto, specifying therein the requested (i) date of such Borrowing, (ii) Type of Revolving Credit Advances comprising such Borrowing, (iii) aggregate amount of such Borrowing, (iv) in the case of a Borrowing consisting of Eurodollar Rate Advances, initial Interest Period for each such Revolving Credit Advance and (v) wire transfer instructions. Each Lender shall, before 12:00 noon (New York City time) on the date of such Borrowing, make available for the account of its Applicable Lending Office to the Agent at the Agent’s Account, in same day funds, such Lender’s ratable portion of such Borrowing. After the Agent’s receipt of such funds and upon fulfillment of the applicable conditions set forth in Article III, the Agent will make such funds available to the Borrower as specified in the Notice of Borrowing.

          (b) Anything in subsection (a) above to the contrary notwithstanding, (i) the Borrower may not select Eurodollar Rate Advances for any Borrowing if the aggregate amount of such Borrowing is less than $5,000,000 or if the obligation of the Lenders to make Eurodollar Rate Advances shall then be suspended pursuant to Section 2.07 or 2.11(a) and (ii) at no time shall the aggregate number of all Borrowings comprising Eurodollar Rate Advances outstanding hereunder be greater than ten.

          (c) Each Notice of Borrowing shall be irrevocable and binding on the Borrower. In the case of any Borrowing that the related Notice of Borrowing specifies is to be comprised of Eurodollar Rate Advances, the Borrower shall indemnify each Lender against any loss, cost or expense incurred by such Lender as a result of any failure to fulfill on or before the date

specified in such Notice of Borrowing for such Borrowing the applicable conditions set forth in Article III, including, without limitation, any loss (excluding loss of anticipated profits), cost or expense incurred by reason of the liquidation or reemployment of deposits or other funds acquired by such Lender to fund the Revolving Credit Advance to be made by such Lender as part of such Borrowing when such Revolving Credit Advance, as a result of such failure, is not made on such date.

          (d) Unless the Agent shall have received notice from a Lender prior to the time of any Borrowing that such Lender will not make available to the Agent such Lender’s ratable portion of such Borrowing, the Agent may assume that such Lender has made such portion available to the Agent on the date of such Borrowing in accordance with subsection (a) of this Section 2.02 and the Agent may, in reliance upon such assumption, make available to the Borrower on such date a corresponding amount. If and to the extent that such Lender shall not have so made such ratable portion available to the Agent, such Lender and the Borrower severally agree to repay to the Agent forthwith on demand such corresponding amount together with interest thereon, for each day from the date such amount is made available to the Borrower until the date such amount is repaid to the Agent, at (i) in the case of the Borrower, the interest rate applicable at the time to Revolving Credit Advances comprising such Borrowing and (ii) in the case of such Lender, the Federal Funds Rate. If such Lender shall repay to the Agent such corresponding amount, such amount so repaid shall constitute such Lender’s Revolving Credit Advance as part of such Borrowing for purposes of this Agreement.

          (e) The failure of any Lender to make the Revolving Credit Advance to be made by it as part of any Borrowing shall not relieve any other Lender of its obligation, if any, hereunder to make its Revolving Credit Advance on the date of such Borrowing, but no Lender shall be responsible for the failure of any other Lender to make the Revolving Credit Advance to be made by such other Lender on the date of any Borrowing.

          SECTION 2.03. Fees .

          (a)  Facility Fee . The Borrower agrees to pay to the Agent for the account of each Lender a facility fee (the “ Facility Fee ”) on the aggregate amount of such Lender’s Commitment from the date hereof in the case of each Initial Lender and from effective date specified in the Assignment and Acceptance pursuant to which it became a Lender in the case of each other Lender until all of the Obligations have been paid in full and the Commitments under this Agreement have been terminated at a rate per annum equal to the Applicable Percentage in effect from time to time, payable in arrears quarterly on the last day of each March, June, September and December, and on the Termination Date.

          (b)  Agent’s Fees . The Borrower shall pay to the Agent for its own account such fees as may from time to time be agreed between the Borrower and the Agent.

          SECTION 2.04. Termination or Reduction of the Commitments; Increase of the Commitments .

          (a) The Commitments shall be automatically terminated on the Termination Date.

          (b) The Borrower shall have the right, upon at least three Business Days’ notice to the Agent, to terminate in whole or reduce ratably in part the unused portions of the respective Commitments of the Lenders, provided that each partial reduction shall be in the aggregate amount of $5,000,000 or an integral multiple of $1,000,000 in excess thereof, or the remaining balance, if less than $5,000,000. Once terminated, a Commitment or portion thereof may not be reinstated.

          (c) At any time prior to the Termination Date the Borrower may, on the terms set forth below, request that the Commitments hereunder be increased; provided , however , that (i) an increase in the Commitments hereunder may only be made at a time when no Default shall have occurred and be continuing, (ii) the “Commitments” under each of the DTE Credit Agreement and the MichCon Credit Agreement (as such term is defined in each of the respective Credit Agreements) must be simultaneously increased by a ratable portion (in proportion to the aggregate “Commitments” under each such Credit Agreement (as such term is defined in each of the respective Credit Agreements)) pursuant to and in accordance with Section 2.04(c) of each thereof, and (iii) in no event shall the aggregate “Commitments” under all Credit Agreements (as such term is defined in each of the respective Credit Agreements) (x) exceed $1,025,000,000, or (y) be increased pursuant to Section 2.04(c) of each Credit Agreement by an aggregate amount in excess of $25,000,000. In the event of such a requested increase in the Commitments, any Lender or other financial institution which the Borrower and the Agent invite to become a Lender or to increase its Commitment may set the amount of its Commitment at a level agreed to by the Borrower and the Agent. In the event that the Borrower and one or more of the Lenders (or other financial institutions) shall agree upon such an increase in the Commitments (i) the Borrower, the Agent and each Lender or other financial institution increasing its Commitment or extending a new Commitment shall enter into a supplement to this Agreement (each, a “ Lender Supplement ”) substantially in the form of Exhibit G setting forth, among other things, the amount of the increased Commitment of such Lender or the new Commitment of such other financial institution, as applicable, and (ii) the Borrower shall furnish, if requested, new or amended and restated Notes, as applicable, to each financial institution that is extending a new Commitment and each Lender that is increasing its Commitment. No such Lender Supplement shall require the approval or consent of any Lender whose Commitment is not being increased. Upon the execution and delivery of such Lender Supplements as provided above and the occurrence of the “Effective Date” specified therein, and upon satisfaction of such other conditions as the Agent may reasonably specify, the financial institutions that are extending new Commitments and the Lenders that are increasing their Commitments (including, without limitation, the Agent administering the reallocation of the aggregate Revolving Credit Advances ratably among the Lenders after giving effect to each such increase in the Commitments, and the delivery of certificates, evidence of corporate authority and legal opinions on behalf of the Borrower), this Agreement shall be deemed to be amended accordingly.

          SECTION 2.05. Repayment of Revolving Credit Advances . The Borrower shall repay to the Agent for the ratable account of the Lenders on the Termination Date the aggregate principal amount of the Revolving Credit Advances then outstanding and all other unpaid Obligations.

          SECTION 2.06. Interest on Revolving Credit Advances .

          (a)  Scheduled Interest . The Borrower shall pay interest on the unpaid principal amount of each Revolving Credit Advance owing to each Lender from the date of such Revolving Credit Advance until such principal amount shall be paid in full, at the following rates per annum:

     (i) Base Rate Advances . During such periods as such Revolving Credit Advance is a Base Rate Advance, a rate per annum equal at all times to the sum of (x) the Base Rate in effect from time to time plus (y) the Applicable Margin in effect from time to time, payable in arrears quarterly on the last day of each March, June, September and December during such periods and on the date such Base Rate Advance shall be Converted or paid in full.

     (ii) Eurodollar Rate Advances . During such periods as such Revolving Credit Advance is a Eurodollar Rate Advance, a rate per annum equal at all times during each Interest Period for such Revolving Credit Advance to the sum of (x) the Eurodollar Rate for such Interest Period for such Revolving Credit Advance plus (y) the Applicable Margin in effect from time to time, payable in arrears on the last day of such Interest Period and, if such Interest Period has a duration of more than three months, on each day that occurs during such Interest Period every three months from the first day of such Interest Period and on the date such Eurodollar Rate Advance shall be Converted or paid in full.

          (b)  Default Interest . (i) Upon the occurrence and during the continuance of an Event of Default, the Borrower shall pay interest on the unpaid principal amount of each Revolving Credit Advance owing to each Lender, payable in arrears on the dates referred to in clause (a)(i) or (a)(ii) above, at a rate per annum equal at all times to 2% per annum above the rate per annum required to be paid on such Revolving Credit Advance pursuant to clause (a)(i) or (a)(ii) above, and (ii) the Borrower shall pay, to the fullest extent permitted by law, interest on the amount of any interest, fee or other amount payable hereunder that is not paid when due, from the date such amount shall be due until such amount shall be paid in full, payable in arrears on the date such amount shall be paid in full and on demand, at a rate per annum equal at all times to 2% per annum above the rate per annum required to be paid on Base Rate Advances pursuant to clause (a)(i) above.

          SECTION 2.07. Interest Rate Determination .

          (a) If applicable, each Reference Bank agrees to furnish to the Agent timely information for the purpose of determining each Eurodollar Rate. If any one or more of the Reference Banks shall not furnish such timely information to the Agent for the purpose of determining any such interest rate, the Agent shall determine such interest rate on the basis of timely information furnished by the remaining Reference Banks. The Agent shall give prompt notice to the Borrower and the Lenders of the applicable interest rate determined by the Agent for purposes of Section 2.06(a)(i) or (ii), and the rate, if any, furnished by each Reference Bank for the purpose of determining the interest rate under Section 2.06(a)(ii).

          (b) If, with respect to any Eurodollar Rate Advances, the Required Lenders notify the Agent that the Eurodollar Rate for any Interest Period for such Eurodollar Rate Advances will not adequately reflect the cost to such Required Lenders of making, funding or maintaining their respective Eurodollar Rate Advances for such Interest Period, the Agent shall forthwith so notify the Borrower and the Lenders, whereupon (i) each Eurodollar Rate Advance will automatically, on the last day of the then existing Interest Period therefor, Convert into a Base Rate Advance, and (ii) the obligation of the Lenders to make, or to Convert Revolving Credit Advances into, Eurodollar Rate Advances shall be suspended until the Agent shall notify the Borrower and the Lenders that the circumstances causing such suspension no longer exist.

          (c) If the Borrower shall fail to select the duration of any Interest Period for any Eurodollar Rate Advances in accordance with the provisions contained in the definition of “Interest Period” in Section 1.01, the Agent will forthwith so notify the Borrower and the Lenders and such Eurodollar Rate Advances will automatically, on the last day of the then existing Interest Period therefor, Convert into Base Rate Advances.

          (d) On the date on which the aggregate unpaid principal amount of Eurodollar Rate Advances comprising any Borrowing shall be reduced, by payment or prepayment or otherwise, to less than $5,000,000, such Eurodollar Rate Advances shall automatically Convert into Base Rate Advances.

          (e) Upon the occurrence and during the continuance of any Event of Default, (i) each Eurodollar Rate Advance will automatically, on the last day of the then existing Interest Period therefor, Convert into a Base Rate Advance and (ii) the obligation of the Lenders to make, or to Convert Revolving Credit Advances into, Eurodollar Rate Advances shall be suspended.

          (f) If the Service is not available or a rate does not timely appear on the Service and fewer than two Reference Banks furnish timely information to the Agent for determining the Eurodollar Rate for any Eurodollar Rate Advances:

     (i) the Agent shall forthwith notify the Borrower and the Lenders that the interest rate cannot be determined for such Eurodollar Rate Advances,

     (ii) with respect to Eurodollar Rate Advances, each such Eurodollar Rate Advance will automatically, on the last day of the then existing Interest Period therefor, Convert into a Base Rate Advance (or if such Advance is then a Base Rate Advance, will continue as a Base Rate Advance), and

     (iii) the obligation of the Lenders to make Eurodollar Rate Advances or to Convert Revolving Credit Advances into Eurodollar Rate Advances shall be suspended until the Agent shall notify the Borrower and the Lenders that the circumstances causing such suspension no longer exist.

          SECTION 2.08. Optional Conversion of Revolving Credit Advances . The Borrower may on any Business Day, upon notice given to the Agent not later than 11:00 A.M. (New York City time) on the third Business Day prior to the date of the proposed Conversion and subject to the provisions of Sections 2.07 and 2.11(a), Convert all Revolving Credit Advances of

one Type comprising the same Borrowing into Revolving Credit Advances of the other Type (it being understood that such Conversion of a Revolving Credit Advance or of its Interest Period does not constitute a repayment or prepayment of such Revolving Credit Advance); provided , however , that any Conversion of Eurodollar Rate Advances into Base Rate Advances shall be made only on the last day of an Interest Period for such Eurodollar Rate Advances, any Conversion of Base Rate Advances into Eurodollar Rate Advances shall be in an amount not less than the minimum amount specified in Section 2.02(b) and no Conversion of any Revolving Credit Advances shall result in more separate Borrowings than permitted under Section 2.02(b). Each such notice of a Conversion shall, within the restrictions specified above, specify (i) the date of such Conversion, (ii) the Revolving Credit Advances to be Converted, and (iii) if such Conversion is into Eurodollar Rate Advances, the duration of the initial Interest Period for each such Eurodollar Rate Advance. Each notice of Conversion shall be irrevocable and binding on the Borrower.

          SECTION 2.09. Prepayments of Revolving Credit Advances .

          (a)  Optional Prepayment . The Borrower may on any Business Day, upon notice given to the Agent not later than 11:00 A.M. (New York City time), (i) on the same day for Base Rate Advances and (ii) on the second Business Day prior to the prepayment in the case of Eurodollar Rate Advances stating the proposed date and aggregate principal amount of the prepayment (and if such notice is given the Borrower shall) prepay the outstanding principal amount of the Revolving Credit Advances comprising part of the same Borrowing in whole or ratably in part, together with accrued interest to the date of such prepayment on the principal amount prepaid; provided , however , that (x) each partial prepayment shall be in an aggregate principal amount of $5,000,000 or an integral multiple of $1,000,000 in excess thereof, or the remaining balance, if less than $5,000,000, and (y) in the event of any such prepayment of a Eurodollar Rate Advance, the Borrower shall be obligated to reimburse the Lenders in respect thereof pursuant to Section 8.04(c).

          (b)  Mandatory Prepayment . The Borrower shall, upon five Business Days’ notice from the Agent given at the request or with the consent of the Required Lenders, prepay the aggregate outstanding principal amount of all Revolving Credit Advances plus all interest thereon and all other amounts payable hereunder or under the Notes, in the event that any Person or two or more Persons acting in concert (other than DTE Energy or any of its Subsidiaries) shall have acquired beneficial ownership (within the meaning of Rule 13d-3 of the Securities and Exchange Commission under the Securities Exchange Act of 1934), directly or indirectly, of Voting Stock of the Borrower (or other securities convertible into such Voting Stock) representing 30% or more of the combined voting power of all Voting Stock of the Borrower.

          SECTION 2.10. Increased Costs .

          (a) If, due to either (i) the introduction of or any change in or in the interpretation of any law or regulation or (ii) the compliance with any guideline or request from any central bank or other Governmental Authority (whether or not having the force of law), there shall be any increase in the cost to any Lender of agreeing to make or making, funding or maintaining Eurodollar Rate Advances (excluding for purposes of this Section 2.10 any such

increased costs resulting from taxes (as to which Section 2.13 shall govern), then the Borrower shall from time to time, upon demand by such Lender (with a copy of such demand to the Agent), pay to the Agent for the account of such Lender additional amounts sufficient to compensate such Lender for such increased cost. A certificate as to the amount of such increased cost, submitted to the Borrower and the Agent by such Lender, shall be conclusive and binding for all purposes, absent manifest error.

          (b) If any Lender determines that compliance with any law or regulation or any guideline or request from any central bank or other Governmental Authority (whether or not having the force of law) affects or would affect the amount of capital required or expected to be maintained by such Lender or any corporation controlling such Lender and that the amount of such capital is increased by or based upon the existence of such Lender’s commitment to lend hereunder and other commitments of this type, then, upon demand by such Lender (with a copy of such demand to the Agent), the Borrower shall pay to the Agent for the account of such Lender, from time to time as specified by such Lender, additional amounts sufficient to compensate such Lender or such corporation in the light of such circumstances, to the extent that such Lender reasonably determines such increase in capital to be allocable to the existence of such Lender’s commitment to lend hereunder. A certificate as to such amounts submitted to the Borrower and the Agent by such Lender shall be conclusive and binding for all purposes, absent manifest error.

          (c) In the event that a Lender demands payment from the Borrower for amounts owing pursuant to subsection (a) or (b) of this Section 2.10, the Borrower may, upon payment of such amounts and subject to the requirements of Sections 8.04 and 8.07, substitute for such Lender another financial institution, which financial institution shall be an Eligible Assignee and shall assume the Commitments of such Lender and purchase the Revolving Credit Advances held by such Lender in accordance with Section 8.07, provided , however , that (i) no Default shall have occurred and be continuing, (ii) the Borrower shall have satisfied all of its obligations in connection with the Loan Documents with respect to such Lender, and (iii) if such assignee is not a Lender, (A) such assignee is acceptable to the Agent and (B) the Borrower shall have paid the Agent a $3,000 administrative fee.

          (d) If any Lender requests compensation under this Section 2.10, then such Lender shall use reasonable efforts to designate a different Applicable Lending Office for funding or booking its Revolving Credit Advances hereunder or to assign its rights and obligations hereunder to another of its offices, branches or affiliates, if, in the judgment of such Lender, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to this Section 2.10 in the future and (ii) would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

          SECTION 2.11. Illegality .

          (a) Notwithstanding any other provision of this Agreement, if any Lender shall notify the Agent that the introduction of or any change in or in the interpretation of any law or regulation makes it unlawful, or any central bank or other Governmental Authority asserts that

it is unlawful, for any Lender or its Eurodollar Lending Office to perform its obligations hereunder to make Eurodollar Rate Advances or to fund or maintain Eurodollar Rate Advances hereunder, (i) each Eurodollar Rate Advance will automatically, upon such demand, Convert into a Base Rate Advance or a Revolving Credit Advance that bears interest at the rate set forth in Section 2.06(a)(i), as the case may be, and (ii) the obligation of the Lenders to make Eurodollar Rate Advances or to Convert Revolving Credit Advances into Eurodollar Rate Advances shall be suspended until the Agent shall notify the Borrower and the Lenders that the circumstances causing such suspension no longer exist.

          (b) If a Conversion occurs or the obligation of the Lenders to make Eurodollar Rate Advances or to Convert Revolving Credit Advances into Eurodollar Rate Advances is suspended, in each case, pursuant to Section 2.11(a), then the Lender causing such Conversion and/or suspension shall use reasonable efforts to designate a different Applicable Lending Office for funding or booking its Revolving Credit Advances hereunder or to assign its rights and obligations hereunder to another of its offices, branches or affiliates, if, in the judgment of such Lender, such designation or assignment (i) would reinstate the Lenders’ obligations to make Eurodollar Rate Advances and to Convert Revolving Credit Advances into Eurodollar Rate Advances and (ii) would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

          SECTION 2.12. Payments and Computations .

          (a) The Borrower shall make each payment hereunder and under the Notes not later than 11:00 A.M. (New York City time) on the day when due in U.S. dollars to the Agent at the Agent’s Account in same day funds and without set off, deduction or counterclaim other than deductions on account of taxes. The Agent will promptly thereafter cause to be distributed like funds relating to the payment of principal or interest or Facility Fees ratably (other than amounts payable pursuant to Section 2.10, 2.13 or 8.04(c)) to the Lenders for the account of their respective Applicable Lending Offices, and like funds relating to the payment of any other amount payable to any Lender to such Lender for the account of its Applicable Lending Office, in each case to be applied in accordance with the terms of this Agreement. Upon its acceptance of an Assignment and Acceptance and recording of the information contained therein in the Register pursuant to Section 8.07(c), from and after the effective date specified in such Assignment and Acceptance, the Agent shall make all payments hereunder and under the Notes in respect of the interest assigned thereby to the Lender assignee thereunder, and the parties to such Assignment and Acceptance shall make all appropriate adjustments in such payments for periods prior to such effective date directly between themselves.

          (b) The Borrower hereby authorizes each Lender, if and to the extent payment owed to such Lender is not made when due hereunder or under the Note held by such Lender, to charge from time to time against any or all of the Borrower’s accounts with such Lender any amount so due.

          (c) All computations of interest based on the Base Rate, when such computations of the Base Rate are based on the Prime Rate, shall be made by the Agent on the

basis of a year of 365 or 366 days, as the case may be, and all computations of interest based on the Base Rate (other than such computations of the Base Rate that are based on the Prime Rate), of interest based on the Eurodollar Rate, and of the Facility Fees shall be made by the Agent on the basis of a year of 360 days, in each case, for the actual number of days (including the first day but excluding the last day) occurring in the period for which such interest or Facility Fees are payable. Each determination by the Agent of an interest rate hereunder shall be conclusive and binding for all purposes, absent manifest error.

          (d) Whenever any payment hereunder or under the Notes shall be stated to be due on a day other than a Business Day, such payment shall be made on the next succeeding Business Day, and such extension of time shall in such case be included in the computation of payment of interest or Facility Fee, as the case may be; provided , however , that, if such extension would cause payment of interest on or principal of Eurodollar Rate Advances to be made in the next following calendar month, such payment shall be made on the next preceding Business Day.

          (e) Unless the Agent shall have received notice from the Borrower prior to the date on which any payment is due to the Lenders hereunder that the Borrower will not make such payment in full, the Agent may assume that the Borrower has made such payment in full to the Agent on such date and the Agent may, in reliance upon such assumption, cause to be distributed to each Lender on such due date an amount equal to the amount then due such Lender. If and to the extent the Borrower shall not have so made such payment in full to the Agent, each Lender shall repay to the Agent forthwith on demand such amount distributed to such Lender together with interest thereon, for each day from the date such amount is distributed to such Lender until the date such Lender repays such amount to the Agent, at the Federal Funds Rate.

          SECTION 2.13. Taxes .

          (a) Subject to the exclusions set forth below in this Section 2.13(a) and, if applicable, compliance with Section 2.13(e), any and all payments by the Borrower hereunder or under the Notes shall be made, in accordance with Section 2.12, free and clear of and without deduction for any and all present or future taxes, levies, imposts, deductions, charges or withholdings, and all liabilities with respect thereto, excluding , in the case of each Lender and the Agent, any and all present or future taxes, levies, imposts, deductions, charges or withholdings imposed on its income, and franchise taxes imposed on it in lieu of income taxes, (i) by the jurisdiction under the laws of which such Lender or the Agent (as the case may be) is organized or any political subdivision thereof and (ii), in the case of each Lender, by the jurisdiction of such Lender’s Applicable Lending Office or any political subdivision thereof (all such non-excluded taxes, levies, imposts, deductions, charges, withholdings and liabilities in respect of payments hereunder or under the Notes being hereinafter referred to as “ Taxes ”). Notwithstanding the above, if the Borrower shall be required by law to deduct any Taxes from or in respect of any sum payable hereunder or under any Note to any Lender or the Agent, the Borrower will so deduct and (i) the sum payable shall be increased as may be necessary so that after making all such deductions on account of Taxes (including deductions on account of Taxes applicable to additional sums payable under this Section 2.13) such Lender or the Agent (as the case may be) receives an amount equal to the sum it would have received had no such

deductions been made, (ii) the Borrower shall make such deductions and (iii) the Borrower shall pay the full amount deducted to the relevant taxation authority or other authority in accordance with applicable law.

          (b) The Borrower agrees to pay any present or future stamp or documentary taxes or any other excise or property taxes, charges or similar levies that arise from any payment made hereunder or under the Notes or from the execution, delivery or registration of this Agreement or the Notes (hereinafter referred to as “ Other Taxes ”).

          (c) Without duplication of the Borrower’s payment obligations on account of Taxes or Other Taxes pursuant to Sections 2.13(a) and (b), the Borrower shall indemnify each Lender and the Agent for the full amount of Taxes or Other Taxes (including, without limitation, any Taxes imposed by any jurisdiction on amounts payable under this Section 2.13) imposed on or paid by such Lender or the Agent (as the case may be) and any liability (including penalties, interest and expenses) arising therefrom or with respect thereto. This indemnification shall be made within 30 days from the date such Lender or the Agent (as the case may be) makes written demand therefor.

          (d) Within 30 days after the date of any payment of Taxes, the Borrower shall furnish to the Agent, at its address referred to in Section 8.02, the original or a certified copy of a receipt evidencing payment thereof. In the case of any payment hereunder or under the Notes by or on behalf of the Borrower through an account or branch outside the United States or by or on behalf of the Borrower by a payor that is not a United States person, if the Borrower determines that no Taxes are payable in respect thereof, the Borrower shall furnish, or shall cause such payor to furnish, to the Agent, at such address, an opinion of counsel acceptable to the Agent stating that such payment is exempt from Taxes. For purposes of this subsection (d) and subsection (e), the terms “ United States ” and “ United States person ” shall have the meanings specified in Section 7701 of the Internal Revenue Code.

          (e) Each Lender organized under the laws of a jurisdiction outside the United States, on or prior to the date of its execution and delivery of this Agreement in the case of each Initial Lender and on the date of the Assignment and Acceptance pursuant to which it becomes a Lender in the case of each other Lender, and from time to time thereafter as requested in writing by the Borrower (but only so long as such Lender remains lawfully able to do so), shall provide each of the Agent and the Borrower with two original Internal Revenue Service Form W-8BEN or W-8ECI, as appropriate, or any successor or other form prescribed by the Internal Revenue Service, certifying that such Lender is exempt from United States withholding tax on payments pursuant to this Agreement or the Notes. If any form or document referred to in this subsection (e) requires the disclosure of information, other than information necessary to compute the tax payable and information required on the date hereof by Internal Revenue Service Form W-8BEN or W-8ECI, that the Lender reasonably considers to be confidential, the Lender shall give notice thereof to the Borrower and shall not be obligated to include in such form or document such confidential information; however , such a Lender will not be entitled to any payment or indemnification on account of any Taxes imposed by the United States.

          (f) Notwithstanding any provision to the contrary in this Agreement, the Borrower will not be obligated to make payments on account of or indemnify the Lenders or the

Agents for any present or future taxes, levies, imposts, deductions, charges or withholdings, and all liabilities with respect thereto, or any present or future stamp or other documentary taxes or property taxes, charges or similar levies that are neither Taxes nor Other Taxes.

          (g) For any period with respect to which a Lender has failed to provide the Borrower with the appropriate form described in Section 2.13(e) ( other than if such failure is due to a change in law occurring subsequent to the date on which a form originally was required to be provided, or if such form otherwise is not required under the first sentence of subsection (e) above), such Lender shall not be entitled to indemnification under Section 2.13(a) or (c) with respect to Taxes imposed by the United States by reason of such failure; provided , however , that should a Lender become subject to Taxes because of its failure to deliver a form required hereunder, the Borrower shall take such steps as the Lender shall reasonably request to assist the Lender to recover such Taxes.

          (h) In the event that a Lender demands payment from the Borrower for amounts owing pursuant to subsection (a) or (b) of this Section 2.13, the Borrower may, upon payment of such amounts and subject to the requirements of Sections 8.04 and 8.07, substitute for such Lender another financial institution, which financial institution shall be an Eligible Assignee and shall assume the Commitments of such Lender and purchase the Revolving Credit Advances held by such Lender in accordance with Section 8.07, provided , however , that (i) no Default shall have occurred and be continuing, (ii) the Borrower shall have satisfied all of its obligations in connection with the Loan Documents with respect to such Lender, and (iii) if such assignee is not a Lender, (A) such assignee is acceptable to the Agent and (B) the Borrower shall have paid the Agent a $3,000 administrative fee.

          (i) Notwithstanding any provision to the contrary in this Agreement, in the event that a Lender that is not an Initial Lender and who purchased its interest in this Agreement without the consent of the Borrower pursuant to Section 8.07(a), seeks (i) payment of additional amounts pursuant to Section 2.13(a), (ii) payment of Other Taxes pursuant to Section 2.13(b), or (iii) indemnification for Taxes or Other Taxes pursuant to Section 2.13(c), the amount of any such payment or indemnification will be no greater than what it would have been had the Initial Lender not transferred, assigned or sold its interest in this Agreement.

          (j) If the Borrower is required to pay any additional amount to any Lender or any Governmental Authority for the account of any Lender pursuant to this Section 2.13, then such Lender shall use reasonable efforts to designate a different Applicable Lending Office for funding or booking its Revolving Credit Advances hereunder or to assign its rights and obligations hereunder to another of its offices, branches or affiliates, if, in the judgment of such Lender, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to this Section 2.13 in the future and (ii) would not subject such Lender to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Lender. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Lender in connection with any such designation or assignment.

          SECTION 2.14. Sharing of Payments, Etc . If any Lender shall obtain any payment (whether voluntary, involuntary, through the exercise of any right of set-off, or otherwise) on account of the Revolving Credit Advances owing to it (other than pursuant to

Section 2.10, 2.13 or 8.04(c)) in excess of its ratable share of payments on account of the Revolving Credit Advances obtained by all of the Lenders, such Lender shall forthwith purchase from the other Lenders such participations in the Revolving Credit Advances owing to them as shall be necessary to cause such purchasing Lender to share the excess payment ratably with each of them; provided , however , that if all or any portion of such excess payment is thereafter recovered from such purchasing Lender, such purchase from each Lender shall be rescinded and such Lender shall repay to the purchasing Lender the purchase price to the extent of such recovery together with an amount equal to such Lender’s ratable share (according to the proportion of (i) the amount of such Lender’s required repayment to (ii) the total amount so recovered from the purchasing Lender) of any interest or other amount paid or payable by the purchasing Lender in respect of the total amount so recovered. The Borrower agrees that any Lender so purchasing a participation from another Lender pursuant to this Section 2.14 may, to the fullest extent permitted by law, exercise all its rights of payment (including the right of set-off) with respect to such participation as fully as if such Lender were the direct creditor of the Borrower in the amount of such participation.

          SECTION 2.15. Use of Proceeds . The proceeds of the Revolving Credit Advances shall be available (and the Borrower agrees that it shall use such proceeds) solely for refinancing Debt of the Borrower under the Existing Credit Agreement (if any), and for general corporate purposes, including commercial paper liquidity, of the Borrower and its Subsidiaries.

          SECTION 2.16. Noteless Agreement; Evidence of Indebtedness .

          (a) Each Lender shall maintain in accordance with its usual practice an account or accounts evidencing the indebtedness of the Borrower to such Lender resulting from each Revolving Credit Advance made by such Lender from time to time, including the amounts of principal and interest payable and paid to such Lender from time to time hereunder.

          (b) The Agent shall also maintain accounts in which it will record (i) the date and the amount of each Revolving Credit Advance made hereunder and the Inter