Exhibit 10(o)

Amendment to EFH Salary Deferral Program

Pursuant to Section 14 of the EFH Salary
Deferral Program (Plan) and the authority delegated to the Non-Qualified Plan (NQP) Committee by the Board of Directors of Energy Future Holdings Corp. (the Company) to amend the Plan, the NQP Committee approves
the following amendments to the Plan:

WHEREAS, the Company wishes to amend the Plan to provide for cashout of small accounts and to
eliminate certain provisions applicable to amounts contributed to the Plan prior to April 1, 1998.

NOW, THEREFORE, the Plan is
hereby amended as follows:



|1. | The Plan is amended by adding a new sentence at the end of existing Section 6.1 to read as follows:
|-- | ---------------------------------------------------------------------------------------------------

Notwithstanding the foregoing, effective as of January 1, 2011, this Section 6.1 shall apply to the entirety of each
Participants Account under the Plan, without regard to the date on which any amounts were deferred or contributed to the Plan.



|2. | The Plan is amended by adding a new sentence at the end of existing Section 6.2 to read as follows:
|-- | ---------------------------------------------------------------------------------------------------

Notwithstanding the foregoing, effective as of January 1, 2011, the provisions of this Section 6.2 shall no longer apply and all
Accounts under the Plan shall be invested in accordance with the provisions of Section 6.1.



|3. | The Plan is amended by adding a new sentence at the end of existing Section 8.1(a) to read as follows:
|-- | ------------------------------------------------------------------------------------------------------

Notwithstanding the foregoing, effective as of January 1, 2011, this Section 8.1(a) shall apply to the entirety of each
Participants Account under the Plan, without regard to the date on which any amounts were deferred or contributed to the Plan.



|4. | The Plan is amended by adding a new sentence at the end of existing Section 8.1(b) to read as follows:
|-- | ------------------------------------------------------------------------------------------------------

Notwithstanding the foregoing, effective as of January 1, 2011, the provisions of this Section 8.1(b) shall no longer apply and
all Accounts under the Plan shall be valued in accordance with the provisions of Section 8.1(a).



|5. | The Plan is amended by adding a new Section 8.2(b)(vi) to read as follows:
|-- | --------------------------------------------------------------------------

(vi) Notwithstanding the foregoing, with respect to any Participant who experiences a Separation from Service on or after January 1, 2011, if the aggregate balance of such



---

Participants Accounts at such time is $5,000 or less, then the full value of such Participants Accounts shall be paid as a lump sum as soon as practicable, but in no event later than
60 days following such Separation from Service, subject to Section 8.3.



|6. | The Plan is amended by adding a new Section 9.3 to read as follows:
|-- | -------------------------------------------------------------------

9.3 Elimination of Special Provisions.

Notwithstanding the foregoing, from
and after January 1, 2011, Exhibit B shall no longer apply.



|7. | Except as amended hereby, the Plan shall remain in full force and effect.
|-- | -------------------------------------------------------------------------



/s/    TONY
HORTON            January 13, 2011Tony Horton

DateSenior Vice President, TreasurerEnergy Future Holdings Corp./s/    LINDA
JOJO                  January 19, 2011Linda Jojo

DateSenior Vice President, Chief Information OfficerEnergy Future Holdings Corp./s/    RICHARD
LANDY        January 20, 2011Rich Landy

DateExecutive Vice President, Human ResourcesEnergy Future Holdings Corp.