Document:

Supplemental Indenture

 Exhibit 4(f) 
 SUPPLEMENTAL INDENTURE 
 Supplemental Indenture (this
“Supplemental Indenture”), dated as of July 8, 2008, between Energy Future Intermediate Holding Company LLC (formerly known as InfrastruX Energy Services BPL LLC), a Delaware limited liability company (the “New
Guaranteeing Subsidiary”), a subsidiary of Energy Future Holdings Corp. (the “Issuer”), and The Bank of New York Mellon (formerly known as The Bank of New York), as trustee (the “Trustee”). 
 W I T N E S S E T H 
 WHEREAS, each of the Issuer and the Guarantors (as defined in the Indenture referred to below) has heretofore executed and delivered to the Trustee an Indenture (the “Indenture”), dated as of October 31, 2007,
providing for the issuance of an unlimited aggregate principal amount of 10.875% Senior Notes due 2017 and 11.250%/12.000% Senior Toggle Notes due 2017 (together, the “Senior Notes”); 
 WHEREAS, Energy Future Intermediate Holding Company LLC, a Delaware limited liability company (the “Old Guarantor”), was
merged with and into the New Guaranteeing Subsidiary, which successor entity, pursuant to Section 5.01(c)(1)(B) of the Indenture, has assumed all of the obligations of the Old Guarantor under the Indenture and the Old Guarantor’s related
Guarantee; 
 WHEREAS, the Indenture provides that under certain circumstances the New Guaranteeing Subsidiary shall execute and
deliver to the Trustee a supplemental indenture pursuant to which the New Guaranteeing Subsidiary shall unconditionally guarantee all of the Issuer’s Obligations under the Senior Notes and the Indenture on the terms and conditions set forth
herein and under the Indenture (the “Guarantee”); and 
 WHEREAS, pursuant to Section 9.01 of the
Indenture, the Trustee is authorized to execute and deliver this Supplemental Indenture. 
 NOW THEREFORE, in consideration of
the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant and agree for the equal and ratable benefit of the Holders of the Senior Notes as follows: 
 1. CAPITALIZED TERMS. Capitalized terms used herein without definition shall have the meanings assigned to
them in the Indenture. 
 2. ASSUMPTION OF THE INDENTURE
AND THE GUARANTEE. The New Guaranteeing Subsidiary, as the successor entity in the above-referenced merger, hereby assumes the Old Guarantor’s obligations under the Indenture and the Guarantee.

 3. AGREEMENT TO GUARANTEE. The New Guaranteeing Subsidiary hereby agrees as
follows: 
 (a) Along with all Guarantors named in the Indenture, to jointly and severally unconditionally
guarantee to each Holder of a Senior Note authenticated and delivered by the Trustee and to the Trustee and its successors and assigns, irrespective of the validity and enforceability of the Indenture, the Senior Notes or the obligations of the
Issuer hereunder or thereunder, that: 
 (i) the principal of and interest, premium and Additional Interest, if
any, on the Senior Notes will be promptly paid in full when due, whether at maturity, by acceleration, redemption or otherwise, and interest on the overdue principal of and interest on the Senior Notes, if any, if lawful, and all other obligations
of the Issuer to the Holders or the Trustee hereunder or thereunder will be promptly paid in full or performed, all in accordance with the terms hereof and thereof; and 
  

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 (ii) in case of any extension of time of payment or renewal of any Senior
Notes or any of such other obligations, that same will be promptly paid in full when due or performed in accordance with the terms of the extension or renewal, whether at stated maturity, by acceleration or otherwise. Failing payment when due of any
amount so guaranteed or any performance so guaranteed for whatever reason, the Guarantors and the New Guaranteeing Subsidiary shall be jointly and severally obligated to pay the same immediately. This is a guarantee of payment and not a guarantee of
collection. 
 (b) The obligations hereunder shall be unconditional, irrespective of the validity, regularity or
enforceability of the Senior Notes or the Indenture, the absence of any action to enforce the same, any waiver or consent by any Holder of the Senior Notes with respect to any provisions hereof or thereof, the recovery of any judgment against the
Issuer, any action to enforce the same or any other circumstance which might otherwise constitute a legal or equitable discharge or defense of a guarantor. 
 (c) The following is hereby waived: diligence, presentment, demand of payment, filing of claims with a court in the event of insolvency or bankruptcy of the Issuer, any right to require a proceeding first
against the Issuer, protest, notice and all demands whatsoever. 
 (d) Except as set forth in Section 6
hereto, this Guarantee shall not be discharged except by complete performance of the obligations contained in the Senior Notes, the Indenture and this Supplemental Indenture, and the New Guaranteeing Subsidiary accepts all obligations of a Guarantor
under the Indenture. 
 (e) If any Holder or the Trustee is required by any court or otherwise to return to the
Issuer, the Guarantors (including the New Guaranteeing Subsidiary), or any custodian, trustee, liquidator or other similar official acting in relation to either the Issuer or the Guarantors, any amount paid either to the Trustee or such Holder, this
Guarantee, to the extent theretofore discharged, shall be reinstated in full force and effect. 
 (f) The New
Guaranteeing Subsidiary shall not be entitled to any right of subrogation in relation to the Holders in respect of any obligations guaranteed hereby until payment in full of all obligations guaranteed hereby. 
 (g) As between the New Guaranteeing Subsidiary, on the one hand, and the Holders and the Trustee, on the other hand,
(x) the maturity of the obligations guaranteed hereby may be accelerated as provided in Article 6 of the Indenture for the purposes of this Guarantee, notwithstanding any stay, injunction or other prohibition preventing such acceleration in
respect of the obligations guaranteed hereby, and (y) in the event of any declaration of acceleration of such obligations as provided in Article 6 of the Indenture, such obligations (whether or not due and payable) shall forthwith become due
and payable by the New Guaranteeing Subsidiary for the purpose of this Guarantee. 
  

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 (h) The New Guaranteeing Subsidiary shall have the right to seek
contribution from any non-paying Guarantor so long as the exercise of such right does not impair the rights of the Holders under this Guarantee. 
 (i) Pursuant to Section 10.02 of the Indenture, after giving effect to all other contingent and fixed liabilities that are relevant under any applicable Bankruptcy or fraudulent conveyance laws, and
after giving effect to any collections from, rights to receive contribution from or payments made by or on behalf of any other Guarantor in respect of the obligations of such other Guarantor under Article 10 of the Indenture, this new Guarantee
shall be limited to the maximum amount permissible such that the obligations of such New Guaranteeing Subsidiary under this Guarantee will not constitute a fraudulent transfer or conveyance. 
 (j) This Guarantee shall remain in full force and effect and continue to be effective should any petition be filed by or
against the Issuer for liquidation, reorganization, should the Issuer become insolvent or make an assignment for the benefit of creditors or should a receiver or trustee be appointed for all or any significant part of the Issuer’s assets, and
shall, to the fullest extent permitted by law, continue to be effective or be reinstated, as the case may be, if at any time payment and performance of the Senior Notes are, pursuant to applicable law, rescinded or reduced in amount, or must
otherwise be restored or returned by any obligee on the Senior Notes and Guarantee, whether as a “voidable preference”, “fraudulent transfer” or otherwise, all as though such payment or performance had not been made. In the event
that any payment or any part thereof, is rescinded, reduced, restored or returned, the Senior Note shall, to the fullest extent permitted by law, be reinstated and deemed reduced only by such amount paid and not so rescinded, reduced, restored or
returned. 
 (k) In case any provision of this Guarantee shall be invalid, illegal or unenforceable, the
validity, legality, and enforceability of the remaining provisions shall not in any way be affected or impaired thereby. 
 (l) This Guarantee shall be a general senior unsecured obligation of such New Guaranteeing Subsidiary, ranking equally in right of payment with all existing and future Senior Indebtedness of the New
Guaranteeing Subsidiary, will be effectively subordinated to all Secured Indebtedness of such New Guaranteeing Subsidiary to the extent of the value of the collateral securing such indebtedness. The Guarantees will be senior in right of payment to
all existing and future Subordinated Indebtedness of each Guarantor. The Senior Notes will be structurally subordinated to Indebtedness and other liabilities of Subsidiaries of the Issuer that do not Guarantee the Senior Notes, if any. 

(m) Each payment to be made by the New Guaranteeing Subsidiary in respect of this Guarantee shall be made without set-off,
counterclaim, reduction or diminution of any kind or nature. 
 4. EXECUTION AND
DELIVERY. The New Guaranteeing Subsidiary agrees that the Guarantee shall remain in full force and effect notwithstanding the absence of the endorsement of any notation of such Guarantee on the Senior Notes. 
 5. MERGER, CONSOLIDATION OR SALE OF ALL
OR SUBSTANTIALLY ALL ASSETS. 
 (a) Except as
otherwise provided in Section 5.01(c) of the Indenture, the New Guaranteeing Subsidiary may not consolidate or merge with or into or wind up into (whether or not the Issuer or New Guaranteeing Subsidiary is the surviving corporation), or sell,
assign, transfer, lease, convey or otherwise dispose of all or substantially all of its properties or assets, in one or more related transactions, to any Person unless: 
 (i) (A) the New Guaranteeing Subsidiary is the surviving corporation or the Person formed by or surviving any such
consolidation or merger (if other than the New Guaranteeing Subsidiary) or to which such sale, assignment, transfer, lease, conveyance or other disposition will have been made is a corporation, partnership, limited partnership, limited liability
partnership, limited liability corporation or trust organized or existing under the laws of the jurisdiction of organization of the New Guaranteeing Subsidiary, as the case may be, or the laws of the United States, any state thereof, the District of
Columbia, or any territory thereof (the New Guaranteeing Subsidiary or such Person, as the case may be, being herein called the “Successor Person”); 
  

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 (B) the Successor Person, if other than the New Guaranteeing Subsidiary,
expressly assumes all the obligations of the New Guaranteeing Subsidiary under the Indenture and the Registration Rights Agreement and the New Guaranteeing Subsidiary’s related Guarantee pursuant to supplemental indentures or other documents or
instruments in form reasonably satisfactory to the Trustee; 
 (C) immediately after such transaction, no
Default exists; and 
 (D) the Issuer shall have delivered to the Trustee an Officer’s Certificate and an
Opinion of Counsel, each stating that such consolidation, merger or transfer and such supplemental indentures, if any, comply with the Indenture; or 
 (ii) the transaction is made in compliance with Section 4.10 of the Indenture; 
 (b) Subject to certain limitations described in the Indenture, the Successor Person will succeed to, and be substituted for, the New Guaranteeing Subsidiary under the Indenture and the New Guaranteeing
Subsidiary’s Guarantee. Notwithstanding the foregoing, the New Guaranteeing Subsidiary may (i) merge into or transfer all or part of its properties and assets to another Guarantor or the Issuer, (ii) merge with an Affiliate of the
Issuer solely for the purpose of reincorporating the New Guaranteeing Subsidiary in the United States, any state thereof, the District of Columbia or any territory thereof or (iii) convert into a corporation, partnership, limited partnership,
limited liability corporation or trust organized or existing under the laws of the jurisdiction of organization of such Guarantor. 
 6. RELEASES. The Guarantee of the New Guaranteeing Subsidiary shall be automatically and unconditionally released and discharged, and no further action by the New Guaranteeing Subsidiary, the Issuer or the Trustee is required
for the release of the New Guaranteeing Subsidiary’s Guarantee, upon: 
 (1) (A) any sale, exchange or
transfer (by merger or otherwise) of the Capital Stock of the New Guaranteeing Subsidiary (including any sale, exchange or transfer), after which the New Guaranteeing Subsidiary is no longer a Restricted Subsidiary or all or substantially all the
assets of the New Guaranteeing Subsidiary which sale, exchange or transfer is made in compliance with the applicable provisions of the Indenture; 
  

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 (B) the release or discharge of the guarantee by the New Guaranteeing
Subsidiary of the guarantee which resulted in the creation of the Guarantee, except a discharge or release by or as a result of payment under such guarantee; 
 (C) the proper designation of the New Guaranteeing Subsidiary as an Unrestricted Subsidiary in compliance with
Section 4.08 of the Indenture; or 
 (D) the Issuer exercising its Legal Defeasance option or Covenant
Defeasance option in accordance with Article 8 of the Indenture or the Issuer’s obligations under the Indenture being discharged in accordance with the terms of the Indenture; and 
 (2) the New Guaranteeing Subsidiary delivering to the Trustee an Officer’s Certificate and an Opinion of Counsel, each
stating that all conditions precedent provided for in the Indenture relating to such transaction have been complied with. 
 7.
NO RECOURSE AGAINST OTHERS. No director, officer, employee, incorporator or stockholder of the New Guaranteeing Subsidiary shall have any liability for any obligations of the Issuer or the
Guarantors (including the New Guaranteeing Subsidiary) under the Senior Notes, any Guarantees, the Indenture or this Supplemental Indenture or for any claim based on, in respect of, or by reason of, such obligations or their creation. Each Holder by
accepting Senior Notes waives and releases all such liability. The waiver and release are part of the consideration for issuance of the Senior Notes. 
 8. GOVERNING LAW. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK. 
 9. COUNTERPARTS. The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an
original, but all of them together represent the same agreement. 
 10. EFFECT OF
HEADINGS. The Section headings herein are for convenience only and shall not affect the construction hereof. 
 11. THE TRUSTEE. The Trustee shall not be responsible in any manner whatsoever for or in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained
herein, all of which recitals are made solely by the New Guaranteeing Subsidiary. 
 12. SUBROGATION. The New
Guaranteeing Subsidiary shall be subrogated to all rights of Holders of Senior Notes against the Issuer in respect of any amounts paid by the New Guaranteeing Subsidiary pursuant to the provisions of Section 3 hereof and Section 10.01 of
the Indenture; provided that if an Event of Default has occurred and is continuing, the New Guaranteeing Subsidiary shall not be entitled to enforce or receive any payments arising out of, or based upon, such right of subrogation until all
amounts then due and payable by the Issuer under the Indenture or the Senior Notes shall have been paid in full. 
 13.
BENEFITS ACKNOWLEDGED. The New Guaranteeing Subsidiary’s Guarantee is subject to the terms and conditions set forth in the Indenture. The New Guaranteeing Subsidiary acknowledges that it will receive direct and
indirect benefits from the financing arrangements contemplated by the Indenture and this Supplemental Indenture and that the guarantee and waivers made by it pursuant to this Guarantee are knowingly made in contemplation of such benefits.

  

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 14. SUCCESSORS. All agreements of the New Guaranteeing Subsidiary in this
Supplemental Indenture shall bind its Successors, except as otherwise provided in Section 3(k) hereof or elsewhere in this Supplemental Indenture. All agreements of the Trustee in this Supplemental Indenture shall bind its successors.

  

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 IN WITNESS WHEREOF, the parties hereto have caused this Supplemental Indenture to be duly
executed, all as of the date first above written. 
  

					
	THE BANK OF NEW YORK MELLON (FORMERLY KNOWN AS THE BANK OF NEW YORK), as Trustee
		
	By:	 	 /s/ Remo Reale

		 	Name:	 	Remo J. Reale
		 	Title:	 	Vice President
	
	ENERGY FUTURE INTERMEDIATE HOLDING COMPANY LLC (FORMERLY KNOWN AS INFRASTRUX ENERGY SERVICES BPL LLC)
		
	By:	 	 /s/ Anthony R. Horton

		 	Name:	 	Anthony R. Horton
		 	Title:	 	Senior Vice President and Treasurer

  

 7Form of Amended and Restated Form of Non-Qualified Stock Option Agreement

 Exhibit 10(m) 
 ENERGY FUTURE HOLDINGS CORP. KEY EMPLOYEE 
 FORM OF
AMENDED AND RESTATED NON-QUALIFIED STOCK OPTION AGREEMENT 
 [For Executive Officers] 
 THIS AMENDED AND RESTATED NON-QUALIFIED STOCK OPTION AGREEMENT (“Agreement”), dated as of
            , 2009 (the “Effective Date”), is made by and between Energy Future Holdings Corp., a Texas corporation (hereinafter referred to as the
“Company”), and the individual whose name is set forth on the signature page hereof (hereinafter referred to as the “Optionee”). Any capitalized terms used but not otherwise defined herein shall have
the meaning set forth in the 2007 Stock Incentive Plan for Key Employees of Energy Future Holdings Corp. and its Affiliates or any successor plan (the “Plan”). 
 WHEREAS, the Organization and Compensation Committee of the Board of the Company (the “Committee”) has
determined that it would be to the advantage and best interest of the Company and its shareholders to grant the Option provided for herein to the Optionee as an incentive for increased efforts during his term of employment with the Company or its
Subsidiaries or Affiliates, and has advised the Company thereof and authorized the undersigned officers to issue said Option; 
 WHEREAS, the Company wishes to act consistently with the Plan, the terms of which are hereby incorporated by reference and made part of this Agreement; and 
 WHEREAS, the parties previously entered into a Non-Qualified Stock Option Agreement, dated
            , 2008 (“Original Option Agreement”), pursuant to which the Company granted stock options to the Optionee, and the parties desire to enter into this Agreement to
(i) reduce the number of performance-related options subject to the award, and (ii) grant additional time-based vesting options on the terms and conditions set forth herein. 
 NOW, THEREFORE, in consideration of the mutual covenants herein contained and other good and valuable consideration, receipt of which
is hereby acknowledged, the parties hereto do hereby agree as follows: 
 ARTICLE I 
 DEFINITIONS 
 Whenever the following terms are used in this Agreement, they shall have the meaning specified below unless the context clearly indicates to the contrary. 
 Section 1.1 Cause 
 “Cause” shall mean
“Cause” as defined in the employment agreement or change-in-control agreement between the Optionee and the Company or any of its Subsidiaries or Affiliates or, if there is no such employment or change-in-control agreement in effect at the
time Optionee’s employment is terminated, “Cause” shall mean, with respect to an Optionee: (i) if, in carrying out his duties to the Company, the Optionee engages in conduct that constitutes (a) a material breach of his
fiduciary duty to the Company or its shareholders (including, without limitation a material breach or attempted breach of the restrictive covenants under the Management Stockholder’s Agreement), (b) gross neglect or (c) gross
misconduct resulting in material economic harm to the Company, provided that any such conduct described in (a), (b) or (c) is not cured within ten (10) business days after the Optionee receives from the Company written notice thereof,
or (ii) Optionee’s conviction of, or entry of a plea of guilty or nolo contendere for, a felony or other crime involving moral turpitude. 

 Section 1.2 Cliff Vesting Option 
 “Cliff Vesting Option” shall have the meaning given such term in Section 2.1 hereof. 
 Section 1.3 Closing Date 
 “Closing Date” shall mean October 10, 2007. 
 Section 1.4 Disability 
 “Disability” shall mean “Disability” as defined
in the employment agreement between the Optionee and the Company or any of its Subsidiaries, or, if there is no such employment agreement, “Disability” shall mean the Optionee’s physical or mental incapacitation and consequent
inability for a period of six consecutive months to perform the Optionee’s duties; provided, however, in the event the Company temporarily replaces the Optionee or transfers the Optionee’s duties or responsibilities to
another individual on account of the Optionee’s mental or physical impairment for a period of time which is covered by the Company’s short term disability plan, the Optionee’s employment shall not be deemed terminated by the Company
and the Optionee shall not be able to resign with Good Reason. 
 Section 1.5 Extended Exercise Date 
 “Extended Exercise Date” shall mean the earlier of: (i) the tenth anniversary of the applicable Grant Date; or
(ii) the later of the date: (A) one hundred and eighty (180) days following the date an Optionee’s employment with the Company and all Service Recipients is terminated and (B) thirty (30) days following the first date
on which the Optionee could exercise the Option, or any portion thereof, and immediately resell the Shares acquired upon such exercise for cash consideration. 
 Section 1.6 Fair Market Value 
 “Fair Market
Value” shall mean, for the purposes of the Plan and this Agreement and notwithstanding the definition contained in the Plan: (i) if there is a public market for the Shares on such date, the average of the high and low closing bid
prices of the Shares on such stock exchange on which the Shares are principally trading on the date in question, or, if there were no sales on such date, on the closest preceding date on which there were sales of Shares or, (ii) if there is no
public market for the Shares, on a per Share basis, the fair market value of the Shares on any given date, as determined reasonably and in good faith by the Board, which shall not take into account any minority interest discount or a discount for
illiquidity of Shares held by an Optionee in excess of any illiquidity discount applicable to Shares generally; provided that if the Board’s determination under this clause (ii) is not based on a valuation completed by an independent
valuation firm within the 6 months preceding the Board’s determination, the Optionee may require the Company to retain an independent valuation firm to determine the fair market value (and the Company will bear the cost of such appraisal,
unless the appraised value is 110% or less of the fair market value as determined by the Board, in which case the Optionee will bear the cost of such appraisal). 
 Section 1.7 Fiscal Year 
 “Fiscal Year” shall
mean each of calendar year 2008, 2009, 2010, 2011 and 2012. 
  

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 Section 1.8 Good Reason 
 “Good Reason” shall mean “Good Reason” as defined in the employment agreement or change-in-control
agreement between the Optionee and the Company or any of its Subsidiaries or Affiliates or, if there is no such employment or change-in-control agreement in effect at the time Optionee’s employment is terminated, “Good Reason” shall
mean (i) a reduction in the Optionee’s base salary or the Optionee’s annual incentive compensation opportunity (other than a general reduction in base salary or annual incentive compensation opportunity that affects all salaried
employees of the Company proportionately); (ii) a transfer of the Optionee’s primary workplace by more than thirty-five (35) miles from the current workplace; (iii) a substantial adverse change in the Optionee’s duties and
responsibilities; (iv) any material breach by the Company of this Agreement, the Management Stockholder’s Agreement, or the Optionee’s employment agreement; or (v) an adverse change in the Optionee’s line of reporting to
superior officers pursuant to the terms of his employment agreement or any change-in-control agreement; provided, however, that any isolated, insubstantial and inadvertent failure by the Company that is not in bad faith and is cured
within ten (10) business days after the Optionee gives the Company written notice of any such event set forth above, shall not constitute Good Reason. 
 Section 1.9 Grant Date 
 “Grant Date” means the
date the Option, or a portion thereof, is granted, which is specified for each of the Original Time Option, the Performance Option, the Incremental Vesting Option and the Cliff Vesting Option in Section 2.1 hereof. 
 Section 1.10 Incremental Vesting Option 
 “Incremental Vesting Option” shall have the meaning given such term in Section 2.1 hereof. 
 Section 1.11 Job Elimination 
 “Job
Elimination” shall mean the termination of an Optionee’s employment without Cause by the Company or any of its Subsidiaries or Affiliates in either of Fiscal Year 2011 or 2012 due to the elimination of the Optionee’s job
position, to the extent determined by the Chief Executive Officer and approved by the Committee that such elimination occurred. 
 Section 1.12 Liquidity Event 
 “Liquidity Event” shall mean the first to occur of
any transaction or completion of a series of transactions that results, directly or indirectly, in the Sponsor Group or their Affiliates realizing with respect to their Shares, cash and/or publicly traded securities (includes Shares held by the
Sponsor Group or their Affiliates, if then publicly traded and freely marketable securities) having a market value that at least equals the Sponsor Return or the Sponsor IRR, provided that if more than 25% of the aggregate amount realized is in the
form of publicly traded securities, no portion of such excess may be taken into account in determining the Sponsor Return or Sponsor IRR until such securities are sold for cash in accordance with Section 3.1(d). 
 Section 1.13 Management Stockholder’s Agreement 
 “Management Stockholder’s Agreement” shall mean the Management Stockholder’s Agreement between the Optionee
and the Company. 
  

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 Section 1.14 Marketable Securities 
 “Marketable Securities” shall mean (i) prior to a public offering, the equity securities of any acquiring entity
that gains control of the Company or (ii) the registered Shares of the Company following a public offering. 
 Section 1.15 Measurement Date 
 “Measurement Date” shall mean any date upon which a
Liquidity Event occurs. 
 Section 1.16 Option 
 “Option” shall mean the aggregate of the Original Time Option, the Performance Option, the Incremental Vesting Option
and the Cliff Vesting Option. 
 Section 1.17 Original Time Option 
 “Original Time Option” shall have the meaning given such term in Section 2.1 hereof. 
 Section 1.18 Parent 
 “Parent” shall mean Texas Energy Future Holdings Limited Partnership, a Delaware Limited Partnership. 
 Section 1.19 Performance Option 
 “Performance
Option” shall have the meaning given such term in Section 2.1 hereof. 
 Section 1.20 Retirement

 “Retirement” shall mean the Optionee's retirement at age 55 or over after having been employed by the
Company or a Subsidiary or Parent for at least ten (10) consecutive years (with at least five consecutive years of employment following the Closing Date). 
 Section 1.21 Secretary 
 “Secretary” shall mean
the Secretary of the Company. 
 Section 1.22 Sponsor IRR 
 “Sponsor IRR” shall mean an amount equal to a pretax compounded annual internal rate of return of at least 20% on the
aggregate amount paid by the Sponsor Group for all of their Shares. For the avoidance of doubt, (a) any calculation of Sponsor IRR will take into account cash dividends or other cash distributions paid on Shares, as well as the value of the
Shares if and when they become publicly traded, and (b) any calculation of Sponsor IRR will not take into account the receipt by the Sponsor Group or any of their Affiliates of any management, monitoring, transaction or other fees payable to
such parties by the Company or any of its Subsidiaries. 
 Section 1.23 Sponsor Return 
 “Sponsor Return” shall mean, on any given date, an amount equal to the product of 3.0 (3.5 in respect of Fiscal Years
2016 and 2017) times the aggregate amount paid by the Sponsor Group for all of their Shares. For the avoidance of doubt, (a) any calculation of Sponsor Return will take into account cash dividends or other cash distributions paid on Shares, as
well as the value of the Shares if and when they become publicly traded, and (b) any calculation of Sponsor Return will not take into account the receipt by the Sponsor Group or any of their Affiliates of any management, monitoring, transaction
or other fees payable to such parties by the Company or any of its Subsidiaries. For purposes of this definition, the term “Fiscal Year” shall include calendar years 2016 and 2017. 
  

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 ARTICLE II 
 GRANT OF OPTIONS 
 Section 2.1 Grant of Options 
 This Agreement evidences the grant to the Optionee, for good and valuable consideration and in each case on the terms and conditions set
forth in this Agreement, of the following: 
 (a) an option to purchase
            Shares, previously granted to Optionee on             2008, which shall vest in accordance with the provisions of
Section 3.1(a)(i) hereof (the “Original Time Option”); 
 (b) an option to purchase
            Shares, previously granted to the Optionee on             , 2008, which shall vest in accordance with the provisions
of Section 3.1(a)(ii) hereof (the “Performance Option”); 
 (c) an option to purchase
            Shares, granted to the Optionee on             , 2009, which shall vest in accordance with the provisions of
Section 3(a)(iii) hereof (the “Incremental Vesting Option”); and 
 (d) an option to purchase
            Shares, granted to the Optionee on             2009, which shall vest in accordance with the provisions of
Section 3.1(a)(iv) hereof (the “Cliff Vesting Option”). 
 The Optionee acknowledges that his
acceptance of this Agreement constitutes his agreement to the surrender and cancellation in full of all of his right, title and interest in the right to purchase             Shares, which
was previously awarded to Optionee as part of the Performance Option pursuant to the Original Option Agreement, with no further obligations of the Company thereunder. 
 Section 2.2 Exercise Price 
 Subject to Section 2.4, the exercise
price of the Shares covered by the Option shall be equal to (a) $            per Share for the Original Time Option and the Performance Option, and
(b) $            per Share for the Incremental Vesting Option and the Cliff Vesting Option (each applicable price, the “Exercise Price”). 
 Section 2.3 No Guarantee of Employment 
 Nothing in this Agreement or in the Plan shall confer upon the Optionee any right to continued employment by the Company or any Subsidiary or Affiliate or shall interfere with or restrict in any way the
rights of the Company and its Subsidiaries or Affiliates, which are hereby expressly reserved, to terminate the employment of the Optionee at any time for any reason whatsoever, with or without Cause, subject to the applicable provisions of, if any,
the Optionee’s employment agreement with the Company. 
  

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 Section 2.4 Adjustments to Option 
 The Option shall be subject to the adjustment provisions of Sections 8 and 9 of the Plan, provided, however, that in the event
of the payment of an extraordinary dividend by the Company to its stockholders, then: the Exercise Price of the Option shall be reduced by the amount of the dividend paid, but only to the extent the Committee determines it to be permitted under
applicable tax laws and not to have adverse tax consequences to the Optionee under Section 409A of the Code; and, if such reduction cannot be fully effected due to such tax laws without adverse tax consequences to the Optionee, then the Company
shall pay to the Optionee a cash payment, on a per Share basis, equal to the balance of the amount of the dividend not permitted to be applied to reduce the Exercise Price of the applicable Option as follows: (a) for each Share subject to a
vested Option, immediately upon the date of such dividend payment; and (b), for each Share subject to an unvested Option, on the date on which such Option becomes vested and exercisable with respect to such Share. 
 ARTICLE III 
 PERIOD OF EXERCISABILITY 
 Section 3.1 Commencement of Exercisability 
 (a) So long as the Optionee continues to be employed by the Company or any other Service Recipients, the Option shall become exercisable
pursuant to the following schedules: 
 (i) Original Time Option. The Original Time Option shall become vested and
exercisable in accordance with the following schedule, provided the Optionee has remained continuously employed by the Company or any other Service Recipients through the applicable vesting dates: 
  

			
	 Vesting Date
	  	Cumulative Percentage of Shares
Subject to the Original Time Option
that are Vested and Exercisable
	 September 30, 2008
	  	20%
		
	 September 30, 2009
	  	40%
		
	 September 30, 2010
	  	60%
		
	 September 30, 2011
	  	80%
		
	 September 30, 2012
	  	100%

 (ii) Performance
Option. The Performance Option shall be eligible to become vested and exercisable as to 20% of the Shares subject to such Option at the end of each of the five Fiscal Years if the Company, on a consolidated basis, achieves its annual EBITDA
targets as set forth in Schedule A attached hereto (each, an “EBITDA Target”) for the given Fiscal Year. Notwithstanding the foregoing, in the event that an EBITDA Target is not achieved in a particular Fiscal Year,
then that portion of the Performance Option that was eligible to vest but failed to vest due to the Company’s failure to achieve its EBITDA Target shall nevertheless vest and become exercisable at the end of either of the two immediately
subsequent Fiscal Years if the applicable two- or three-year cumulative EBITDA Target (each, a “Cumulative EBITDA Target”) set forth on Schedule A attached hereto is achieved on a cumulative basis at the end of
either of the two immediately subsequent Fiscal Years with respect to a Fiscal Year completed no more than two years prior to the then completed Fiscal Year(s); provided that, in the event that an EBITDA Target is not achieved in either of Fiscal
Years 2011 or 2012, then that portion of the Performance Option that was eligible to vest but failed to vest due to the Company’s failure to achieve its EBITDA Target or the applicable Cumulative EBITDA Target shall nevertheless vest and become
exercisable at the end of either of the two immediately subsequent Fiscal Years of the Company if the budgeted EBITDA target set by the Board and the Committee in respect of such Fiscal Year of the Company is achieved and the excess over such
budgeted amount is sufficient to satisfy the shortfall from Fiscal Year 2011 or 2012. For purposes of the foregoing proviso clause, the term “Fiscal Year” shall include calendar years 2013 and 2014. 
  

 6 

 (iii) Incremental Vesting Option. The Incremental Vesting Option shall become vested
and exercisable with respect to 20% of the Shares subject to the Incremental Vesting Option on each of September 30, 2010, September 30, 2011, September 30, 2012, September 30, 2013, and September 30, 2014,
provided the Optionee has remained continuously employed by the Company or any other Service Recipients through the applicable vesting dates. 
 (iv) Cliff Vesting Option. The Cliff Vesting Option shall become vested and exercisable with respect to 100% of the Shares subject to the Cliff Vesting Option on September 30, 2014, provided
the Optionee has remained continuously employed by the Company or any other Service Recipients through September 30, 2014. 
 (b) Notwithstanding any of Section 3.1(a) above, upon the occurrence of a termination of employment without Cause, termination of employment on account of the Company or other applicable Service Recipient’s failure to renew the
Optionee’s existing employment agreement, or a resignation by the Optionee for Good Reason, in each case following the occurrence of a Change in Control, the Original Time Option shall become immediately exercisable as to 100% of the Shares
subject to such Option immediately prior to the Change of Control. 
 (c) Notwithstanding any of Section 3.1(a) above, upon
the occurrence of a Change in Control, the Incremental Vesting Option and Cliff Vesting Option shall become immediately exercisable as to 100% of the Shares subject to each such Option immediately prior to the Change of Control, provided that the
Optionee remains continuously employed by the Company or any other Service Recipients on the date such Change in Control occurs. 
 (d) Notwithstanding any of Section 3.1(a) above, upon the occurrence of a Liquidity Event, subject to the Optionee being employed on the date of such event, the Performance Option shall become immediately exercisable as to 100% of the
Shares subject to such Option immediately prior to the Liquidity Event (but only to the extent such Option has not otherwise terminated or become exercisable). If Sponsor IRR and Sponsor Return would not be achieved as a result of the Performance
Options becoming immediately exercisable as to 100% of the Shares subject to such Option pursuant to the preceding sentence, “100%” in the preceding sentence shall be replaced with the maximum percentage so that either the Sponsor IRR or
Sponsor Return is achieved. In the event that the Sponsor Group receives Marketable Securities in an event constituting a Measurement Date (including, following a public offering, Shares) in excess of more than 25% of the aggregate amount realized
in such event, (1) Sponsor IRR and Sponsor Return shall be initially calculated at the time of the Measurement Date without regard to the value of such Marketable Securities so received and such resulting Sponsor Return and Sponsor IRR shall be
used to determine vesting of Shares subject to the Performance Option in accordance with this Section 3.1(d); and (2) if the Sponsor Return and/or Sponsor IRR as calculated in (1) above do not result in 100% vesting of the outstanding
exercisable Shares subject to such Performance Option immediately prior to the Measurement Date, Sponsor Return and Sponsor IRR shall be recalculated upon each direct or indirect disposition of such Marketable Securities by the Sponsor Group for
cash, discounting the cash received to determine its present value at the time of the Measurement Date. If such recalculated Sponsor IRR and/or Sponsor Return would have resulted in 100% vesting of all Shares subject to the Performance Option at the
time of the Measurement Date, then 100% of such Performance Option shall immediately vest; provided, however, that any Optionee whose employment is terminated without Cause by the Company or as a result of the Company or other
applicable Service Recipient’s failure to renew his employment agreement, or who terminates his employment for Good Reason, such Optionee’s Performance Option, or a portion thereof, having been forfeited or cancelled between the occurrence
of the Measurement Date and the subsequent vesting of such Performance Option, in accordance with this Section 3.1(d), shall be entitled to the difference between the price per Share paid on the Measurement Date and the strike price of the
Performance Option that was so cancelled or forfeited. 
  

 7 

 (e) Except as provided above, no Option shall become exercisable as to any additional Shares
following the termination of employment of the Optionee for any reason and any Option, which is unexercisable as of the Optionee’s termination of employment, shall immediately expire without payment therefor. 
 Section 3.2 Expiration of Option 
 Except as otherwise provided in Section 5 or 6 of the Management Stockholder’s Agreement, the Optionee may not exercise the Option, or any portion thereof, to any extent after the first to occur
of the following events: 
 (a) The tenth anniversary of the applicable Grant Date; 
 (b) The first anniversary of the date of the Optionee’s termination of employment with the Company and all Service Recipients, if the
Optionee’s employment is terminated by reason of death or Disability; 
 (c) Immediately upon the date of an
Optionee’s termination of employment by the Company and all Service Recipients for Cause; 
 (d) Thirty (30) days
after the date of an Optionee’s resignation from employment with the Company and all Service Recipients without Good Reason (except due to death or Disability); 
 (e) One hundred and eighty (180) days after the date of: (i) an Optionee’s resignation from employment with the Company and all Service Recipients for Good Reason; (ii) an
Optionee’s Retirement; or (iii) an Optionee’s termination of employment by the Company and all Service Recipients without Cause (for any reason other than death, Disability, or Job Elimination), including upon nonrenewal of
Optionee’s existing employment agreement by the Company or other applicable Service Recipient, in the event such termination listed in (i), (ii), or (iii) occurs prior to the fifth anniversary of the Closing Date; 
 (f) The Extended Exercise Date in the event of (i) an Optionee’s resignation from employment with the Company and all Service
Recipients for Good Reason; (ii) an Optionee’s Retirement; or (iii) an Optionee’s termination of employment by the Company and all Service Recipients without Cause (for any reason other death, Disability, or Job Elimination),
including upon nonrenewal of Optionee’s existing employment agreement by the Company or other applicable Service Recipient, and any such termination listed in (i), (ii), or (iii) occurs on or after the fifth anniversary of the Closing
Date; 
  

 8 

 (g) The Extended Exercise Date in the event of an Optionee’s Job Elimination;

 (h) Immediately upon the date of an Optionee’s breach of the provisions of Section 22(a)(ii) of the Management
Stockholder’s Agreement; or 
 (i) At the discretion of the Company, if the Committee so determines pursuant to
Section 9 of the Plan, but only to the extent the Committee determines it to be permitted under applicable tax laws and to not have adverse tax consequences to the Optionee under Section 409A of the Code. 
 Notwithstanding the foregoing, the time periods set forth in this Section 3.2 shall not begin to run with respect to Performance
Options that vest in accordance with Section 3.1(a)(ii) above until the time at which the Board certifies the financial statements for the Company for the Fiscal Year immediately preceding the Fiscal Year in which, or for the Fiscal Year in
which, termination of employment occurs. For purposes of the foregoing provision, the term “Fiscal Year” shall include calendar years 2013 and 2014. 
 ARTICLE IV 
 EXERCISE OF OPTION 
 Section 4.1 Person Eligible to Exercise 
 During the lifetime of the Optionee, only the Optionee (or his duly authorized legal representative) may exercise the Option or any portion thereof. After the death of the Optionee, any exercisable
portion of the Option may, prior to the time when an Option becomes unexercisable under Section 3.2, be exercised by his personal representative or by any person empowered to do so under the Optionee’s will or under the then applicable
laws of descent and distribution. 
 Section 4.2 Partial Exercise 
 Any exercisable portion of the Option or the entire Option, if then wholly exercisable, may be exercised in whole or in part at any time
prior to the time when the Option or portion thereof becomes unexercisable under Section 3.2; provided, however, that any partial exercise shall be for whole Shares only. 
 Section 4.3 Manner of Exercise 
 The Option, or any exercisable portion thereof, may be exercised solely by delivering to the Secretary or her office all of the following prior to the time when the Option or such portion becomes
unexercisable under Section 3.2: 
 (a) Notice in writing signed by the Optionee or the other person then entitled to
exercise the Option or portion thereof, stating that the Option or portion thereof is thereby exercised, such notice complying with all applicable rules established by the Committee; 
 (b) (i) Full payment (in cash, by check, or by a combination thereof or through tender of previously owned Shares (any such Shares valued at
Fair Market Value on the date of exercise) that the Participant has held for at least six months (or such other period as may be required by the Company’s accountants but only to the extent required to avoid liability accounting under FAS
123(R) or any successor standard thereto)) for the Shares with respect to which such Option or portion thereof is exercised or (ii) indication that the Optionee elects to have the number of Shares that would otherwise be issued to the Optionee
reduced by a number of Shares having an equivalent Fair Market Value to the payment that would otherwise be made by the Optionee to the Company pursuant to clause (i) of this subsection (b); 
  

 9 

 (c) (i) Full payment (in cash or by check or by a combination thereof) to satisfy the
minimum withholding tax obligation with respect to which such Option or portion thereof is exercised; or (ii) notice in writing that the Optionee elects to have the number of Shares that would otherwise be issued to the Optionee reduced by a
number of Shares having an equivalent Fair Market Value to the payment that would otherwise be made by the Optionee to the Company pursuant to clause (i) of this subsection (c); 
 (d) A bona fide written representation and agreement, in a form satisfactory to the Committee, signed by the Optionee or other person then
entitled to exercise such Option or portion thereof, stating that the Shares are being acquired for his own account, for investment and without any present intention of distributing or reselling said Shares or any of them except as may be permitted
under the Securities Act of 1933, as amended (the “Act”), and then applicable rules and regulations thereunder, and that the Optionee or other person then entitled to exercise such Option or portion thereof will indemnify the
Company against and hold it free and harmless from any loss, damage, expense or liability resulting to the Company if any sale or distribution of the Shares by such person is contrary to the representation and agreement referred to above;
provided, however, that the Committee may, in its reasonable discretion, take whatever additional actions it deems reasonably necessary to ensure the observance and performance of such representation and agreement and to effect
compliance with the Act and any other federal or state securities laws or regulations; and 
 (e) In the event the Option or
portion thereof shall be exercised pursuant to Section 4.1 by any person or persons other than the Optionee, appropriate proof of the right of such person or persons to exercise the Option. 
 Without limiting the generality of the foregoing, the Committee may require an opinion of counsel acceptable to it to the effect that any subsequent
transfer of Shares acquired on exercise of an Option does not violate the Act, and may issue stop-transfer orders covering such Shares. Share certificates evidencing stock issued on exercise of this Option shall bear an appropriate legend referring
to the provisions of subsection (d) above and the agreements herein. The written representation and agreement referred to in subsection (d) above shall, however, not be required if the Shares to be issued pursuant to such exercise have
been registered under the Act, and such registration is then effective in respect of such Shares. 
 Section 4.4
Conditions to Issuance of Stock Certificates 
 The Shares deliverable upon the exercise of the Option, or any portion
thereof, may be either previously authorized but unissued Shares or issued Shares, which have then been reacquired by the Company. Such Shares shall be fully paid and nonassessable. The Company shall not be required to issue or deliver any
certificate or certificates for Shares of stock purchased (if certified, or if not certified, register the issuance of such Shares on its books and records) upon the exercise of the Option or a portion thereof prior to fulfillment of all of the
following conditions: 
 (a) The obtaining of approval or other clearance from any state or federal governmental agency which
the Committee shall, in its reasonable and good faith discretion, determine to be necessary or advisable; 
  

 10 

 (b) The execution by the Optionee of the Management Stockholder’s Agreement and a Sale
Participation Agreement; and 
 (c) The lapse of such reasonable period of time following the exercise of the Option as the
Committee may from time to time establish for reasons of administrative convenience or as may otherwise be required by applicable law. 
 Section 4.5 Rights as Stockholder 
 Except as otherwise provided in Section 2.4 of this Agreement, the
holder of an Option shall not be, nor have any of the rights or privileges of, a stockholder of the Company with respect to any Shares purchasable upon the exercise of the Option or any portion thereof unless and until certificates representing such
Shares shall have been issued by the Company to such holder or the Shares have otherwise been recorded in the records of the Company as owned by such holder. 
 ARTICLE V 
 MISCELLANEOUS 
 Section 5.1 Administration 
 The Committee shall have the power to interpret the Plan and this Agreement and to adopt, interpret, or revoke rules for the administration, interpretation and application of the Plan. All actions taken
and all interpretations and determinations made by the Committee shall be final and binding upon the Optionee, the Company and all other interested persons. No member of the Committee shall be personally liable for any action, determination or
interpretation made in good faith with respect to the Plan or the Option. In its absolute discretion, the Board may at any time and from time to time exercise any and all rights and duties of the Committee under the Plan and this Agreement.

 Section 5.2 Option Not Transferable 
 Neither the Option nor any interest or right therein or part thereof shall be liable for the debts, contracts or engagements of the Optionee or his successors in interest or shall be subject to
disposition by transfer, alienation, anticipation, pledge, encumbrance, assignment or any other means whether such disposition be voluntary or involuntary or by operation of law by judgment, levy, attachment, garnishment or any other legal or
equitable proceedings (including bankruptcy), and any attempted disposition thereof shall be null and void and of no effect; provided, however, that this Section 5.2 shall not prevent transfers by will or by the applicable laws of
descent and distribution. 
 Section 5.3 Notices 
 Any notice to be given under the terms of this Agreement to the Company shall be addressed to the Company in care of its Secretary, and any
notice to be given to the Optionee shall be addressed to him at the last address on file with the Company. By a notice given pursuant to this Section 5.3 either party may hereafter designate a different address for notices to be given to that
party. Any notice, which is required to be given to the Optionee, shall, if the Optionee is then deceased, be given to the Optionee’s personal representative if such representative has previously informed the Company of his status and address
by written notice under this Section 5.3. Any notice shall have been deemed duly given when (i) delivered in person or (ii) enclosed in a properly addressed, sealed envelope or wrapper deposited (with postage or fees prepaid) with a
post office or branch post office regularly maintained by the United States Postal Service, or an office regularly maintained by FedEx, UPS, or comparable non-public mail carrier. 
  

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 Section 5.4 Titles; Pronouns 
 Titles are provided herein for convenience only and are not to serve as a basis for interpretation or construction of this Agreement. The
masculine pronoun shall include the feminine and neuter, and the singular the plural, where the context so indicates. 
 Section 5.5 Applicability of Plan, Management Stockholder’s Agreement and Sale Participation Agreement 
 The Option and the Shares issued to the Optionee upon exercise of the Option shall be subject to all of the terms and provisions of the Plan, the Management Stockholder’s Agreement and a Sale Participation Agreement, to the extent
applicable to the Option and such Shares. 
 Section 5.6 Amendment 
 Subject to Section 10 of the Plan, this Agreement may be amended only by a writing executed by the parties hereto, which specifically
states that it is amending this Agreement. 
 Section 5.7 Governing Law 
 The laws of the State of Texas shall govern the interpretation, validity and performance of the terms of this Agreement regardless of the law
that might be applied under principles of conflicts of laws. 
 Section 5.8 Arbitration 
 In the event of any controversy among the parties hereto arising out of, or relating to, this Agreement which cannot be settled amicably by
the parties, such controversy shall be finally, exclusively and conclusively settled by mandatory arbitration conducted expeditiously in accordance with the American Arbitration Association rules, by a single independent arbitrator. Such arbitration
process shall take place within the Dallas, Texas metropolitan area. The decision of the arbitrator shall be final and binding upon all parties hereto and shall be rendered pursuant to a written decision, which contains a detailed recital of the
arbitrator’s reasoning. Judgment upon the award rendered may be entered in any court having jurisdiction thereof. Each party shall bear its own legal fees and expenses, unless otherwise determined by the arbitrator. 
 [Signatures on next page.] 
  

 12 

 IN WITNESS WHEREOF, this Agreement has been executed and delivered by the parties
hereto. 
  

			
	
	ENERGY FUTURE HOLDINGS CORP.
		
	By:	 	  

	Name:	 	  

	Title:	 	  

  

			
	OPTIONEE:
	  

		
	ADDRESS:	 	

			
	  
	 	
	  
	 	

 Summary of Option grants governed by this Agreement appears on the following page.

 [Signature Page of Stock Option Agreement] 

 Summary of Option 
  

									
	 	  	Original Time
Option	  	Performance
Option	  	Incremental
Vesting Option	  	Cliff Vesting
Option
	 Aggregate number of Shares subject to the Option
	  		  		  		  	
					
	 Grant Date
	  		  		  		  	
					
	 Exercise Price
	  		  		  		  	

  

 14

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