POWER OF ATTORNEY

The undersigned hereby constitutes and appoints each of Patricia D. Horn and

Sean Trauschke, signing singly, the undersigned’s true and lawful attorney-in-fact to:

(1) execute for and on behalf of the undersigned, in the undersigned’s capacity as

a director and/or officer of OGE Energy Corp. (the “Company”), Forms 3, 4

and 5 in accordance with Section 16(a) of the Securities Exchange Act of

1934, as amended, and the rules and regulations thereunder:

(2) do and perform any and all acts for and on behalf of the undersigned which

may be necessary or desirable to complete and execute any such Form 3, 4

or 5 and timely file such form with the United States Securities and Exchange

Commission and any stock exchange or similar authority; and

(3) take any other action of any type whatsoever in connection with the foregoing

which, in the opinion of such attorney-in-fact, may be of benefit to, in the best

interest of, or legally required by, the undersigned, it being understood that the

documents executed by such attorney-in-fact on behalf of the undersigned

pursuant to this Power of Attorney shall be in such form and shall contain such

terms and conditions as such attorney-in-fact may approve in his or her discretion.

The undersigned hereby grants to each attorney-in-fact named above full power

and authority to do and perform any and every act requisite, necessary or proper to be

done in the exercise of any of the rights and powers herein granted, as fully as the

undersigned could do it personally present, with full power of substitution or revocation,

hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s

substitute or substitutes, shall lawfully do or cause to be done by virtue of this Power of

Attorney and the rights and powers herein granted. The undersigned acknowledges

that the foregoing attorney-in-fact, in serving in such capacity at the request of the

undersigned, are not assuming, nor is the company assuming, any of the undersigned’s

responsibilities to comply with Section 16 of the Securities Exchange Act of 1934,

as amended.

This Power of Attorney shall remain in full force and effect until the undersigned

is no longer required to file Forms 3, 4 and 5 with respect to the undersigned’s holdings

of, and transactions in, securities issued by the Company, unless earlier revoked by the

undersigned in a signed writing delivered to the foregoing attorneys-in-fact.

IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to

be executed as of this 12th day of October, 2010.

William J. Bullard, Pursuant to Power of

Attorney being filed herewith

OGE ENERGY CORP. 4