UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549





FORM 10-K/A

(Amendment No. 1)







|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ------------------------------------------------------------------------------------

FOR THE FISCAL YEAR ENDED DECEMBER 31, 2013

 OR 



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
|- | ----------------------------------------------------------------------------------------

Commission File Number 1-12833





Energy Future
Holdings Corp.

(Exact name of registrant as specified in its charter)







|                                                               |  |                                                     
|-------------------------------------------------------------- |  | ----------------------------------------------------
|Texas                                                          |  | 46-2488810                                          
|(State or other jurisdiction of
incorporation or organization) |  | (I.R.S. Employer
Identification No.)                
|                                                               | 
|1601 Bryan Street, Dallas, TX 75201-3411                       |  | (214) 812-4600                                      
|(Address of principal executive offices) (Zip Code)            |  | (Registrants telephone number, including area code)





Securities registered pursuant to Section 12(b) of the Act:



|                            |  |                                          
|--------------------------- |  | -----------------------------------------
|Title of Each Class         |  | Name of Each Exchange on Which Registered
|9.75% Senior Notes due 2019 |  | New York Stock Exchange                  

Securities registered pursuant to Section 12(g) of the Act: None





Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    Yes   ̈    No  x

Indicate by check mark
if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Act.    Yes   ̈    No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by
Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past
90 days.    Yes  x    No   ̈

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required
to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such
files).    Yes  x    No   ̈

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (229.405 of this chapter) is not contained herein, and
will not be contained, to the best of registrants knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form
10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an
accelerated filer, a non-accelerated filer, or a smaller reporting company. See definitions of large accelerated filer, accelerated filer and smaller reporting company in Rule 12b-2 of the Exchange Act.



|                        |  |                                                  |  |                           |  |  
|----------------------- |  | ------------------------------------------------ |  | ------------------------- |  | -
|Large accelerated filer |  |  ̈                                                |  | Accelerated filer         |  |  ̈
|                        |  |                                                  | 
|Non-Accelerated filer   |  | x  (Do not check if a smaller reporting company) |  | Smaller reporting company |  |  ̈

Indicate by check mark if the registrant is a shell company (as defined in Rule 12b-2 of the Exchange
Act).    Yes   ̈    No  x

At April 29, 2014, there were 1,669,861,383 shares of common stock, without par value, outstanding of Energy Future Holdings Corp. (substantially all of
which were owned by Texas Energy Future Holdings Limited Partnership, Energy Future Holdings Corp.s parent holding company, and none of which is publicly traded).





DOCUMENTS INCORPORATED BY REFERENCE

None









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EXPLANATORY NOTE

Energy Future Holdings Corp. (the Company) is filing this Amendment No. 1 to the Annual Report on Form 10-K (the Form 10-K/A) to amend its Annual Report
on Form 10-K for the year ended December 31, 2013, which was filed with the Securities and Exchange Commission on April 30, 2014 (the Original Filing). The Company is filing this Form 10-K/A solely to provide Exhibits 10(cccc) and
10(dddd), which were not included in the Original Filing.

No other changes have been made to the Original Filing other than the inclusion of Exhibits
10(cccc) and 10(dddd). This Form 10-K/A does not reflect events occurring after the filing date of the Original Filing. The descriptions of the Restructuring Support and Lock-Up Agreement and the Commitment Letter set forth in the Original Filing
are subject to, and qualified in their entirety by, the full text of the Restructuring Support and Lock-Up Agreement and Commitment Letter, which are attached hereto as Exhibit 10(cccc) and 10(dddd), respectively, and incorporated herein by
reference.



1



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|Item 15. | EXHIBITS AND FINANCIAL STATEMENT SCHEDULES
|-------- | ------------------------------------------



|         |  |                                           |  |            |  |  |   |  |  |                                                                                                                                                                
|-------- |  | ----------------------------------------- |  | ---------- |  |  | - |  |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibits |  | Previously Filed* With File Number        |  | As
Exhibit |  |  |   |  | 
|         | 
|(10)     |  | Material Contracts                       
|         | 
|         |  | Credit Agreements and Related Agreements 
|         |  |                                           |  |           
|10(cccc) |  |                                           |  |            |  |  |  |  |  | Restructuring Support and Lock-Up Agreement, dated April 29, 2014, by and among EFH Corp. and the parties thereto.                                             
|         |  |                                           |  |           
|10(dddd) |  |                                           |  |            |  |  |  |  |  | Investment Commitment, dated April 29, 2014, by and among EFH Corp., Energy Future Intermediate Holding Company LLC and the initial commitment parties thereto.
|         | 
|31       |  | Rule 13a - 14(a)/15d-14(a) Certifications
|         |  |                                           |  |           
|31(a)    |  |                                           |  |            |  |  |  |  |  | Certification of John F. Young, principal executive officer of Energy Future Holdings Corp., pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.        
|         |  |                                           |  |           
|31(b)    |  |                                           |  |            |  |  |  |  |  | Certification of Paul M. Keglevic, principal financial officer of Energy Future Holdings Corp., pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.     



|* | Incorporated herein by reference
|- | --------------------------------



2



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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Energy Future Holdings Corp. has duly caused this report
to be signed on its behalf by the undersigned, thereunto duly authorized.



|                  |  |  |  |                              |  |                             |  |                                     
|----------------- |  |  |  | ---------------------------- |  | --------------------------- |  | ------------------------------------
|                  |  |  |  | ENERGY FUTURE HOLDINGS CORP.
|                  |  |  | 
|Date: May 1, 2014 |  |  |  | By:                          |  | /s/ STANLEY J. SZLAUDERBACH
|                  |  |  |  |                              |  | Name:                       |  | Stanley J. Szlauderbach             
|                  |  |  |  |                              |  | Title:                      |  | Senior Vice President and Controller



---

EXHIBIT INDEX



|         |  |                                           |  |           |  |  |   |  |  |                                                                                                                                                                
|-------- |  | ----------------------------------------- |  | --------- |  |  | - |  |  | ---------------------------------------------------------------------------------------------------------------------------------------------------------------
|Exhibits |  | Previously Filed* With File Number        |  | AsExhibit |  |  |   |  | 
|         | 
|(10)     |  | Material Contracts                       
|         | 
|         |  | Credit Agreements and Related Agreements 
|         |  |                                           |  |          
|10(cccc) |  |                                           |  |           |  |  |  |  |  | Restructuring Support and Lock-Up Agreement, dated April 29, 2014, by and among EFH Corp. and the parties thereto.                                             
|         |  |                                           |  |          
|10(dddd) |  |                                           |  |           |  |  |  |  |  | Investment Commitment, dated April 29, 2014, by and among EFH Corp., Energy Future Intermediate Holding Company LLC and the initial commitment parties thereto.
|         | 
|31       |  | Rule 13a - 14(a)/15d-14(a) Certifications
|         |  |                                           |  |          
|31(a)    |  |                                           |  |           |  |  |  |  |  | Certification of John F. Young, principal executive officer of Energy Future Holdings Corp., pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.        
|         |  |                                           |  |          
|31(b)    |  |                                           |  |           |  |  |  |  |  | Certification of Paul M. Keglevic, principal financial officer of Energy Future Holdings Corp., pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.     



|* | Incorporated herein by reference
|- | --------------------------------