Duke Energy to Release First Quarter 2010 Earnings May 4

April 9, 2010

CHARLOTTE, NC – April 9, 2010 –  Duke Energy will release its first quarter 2010 earnings results at 7 a.m. ET on Tuesday, May 4.

An earnings conference call for analysts is scheduled for 11 a.m. ET Tuesday, May 4. The conference call can be accessed via the investors’ section (http://www.duke-energy.com/investors/) of Duke Energy’s Web site or by dialing 913-312-4376 outside the United States or 800-289-0508 in the United States. The confirmation code is 5050814. Please call in 10 to 15 minutes prior to the scheduled start time. A replay of the conference call will be available until midnight ET, June 4, 2010, by calling 719-457-0820 outside the United States or 888-203-1112 in the United States, and using the code 5050814. A replay and transcript also will be available by accessing the investors’ section of the company’s Web site.

Headquartered in Charlotte, N.C., Duke Energy is a Fortune 500 company traded on the New York Stock Exchange under the symbol DUK. More information about the company is available on the Internet at: www.duke-energy.com.