UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the

Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): June 20, 2011

DUKE ENERGY CORPORATION

 (Exact Name of Registrant as Specified in its Charter)

526 South Church Street, Charlotte, North Carolina 28202

(Address of Principal Executive Offices, including Zip code)

(704) 594-6200

(Registrant’s telephone number, including area code)

DUKE ENERGY OHIO, INC.

 (Exact Name of Registrant as Specified in its Charter)

139 East Fourth Street, Cincinnati, Ohio 45202

(Address of Principal Executive Offices, including Zip code)

(704) 594-6200

(Registrant’s telephone number, including area code)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

o            Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

o            Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

o            Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

o            Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240. 13e-4(c))

Item 7.01.  Regulation FD Disclosure.

On June 20, 2011, Duke Energy Ohio, Inc. (“DE Ohio”) filed an application with the Public Utilities Commission of Ohio seeking approval of an Electric Security Plan (“ESP”) beginning January 1, 2012 with rates in effect through May 31, 2021.   Pursuant to the ESP, DE Ohio customers would pay for capacity through a non-bypassable, cost-of-service-based charge, while energy would be priced and purchased through a competitive auction bidding process.

A summary providing additional detail on the ESP filing is attached as Exhibit 99.1.

Item 9.01.   Financial Statements and Exhibits.

(d)          Exhibits.

99.1         Summary of Duke Energy Ohio Electric Security Plan (ESP) Filing.

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SIGNATURE

Pursuant to the requirements of the Securities and Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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EXHIBIT INDEX

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