Duke Energy received the subpoena from the San Francisco office of the U.S. Attorney as part of a grand jury investigation.  Duke Energy will cooperate with the U.S. Attorney, as it has with other government organizations inquiring into similar issues.

Duke Energy is a diversified multinational energy company with an integrated network of energy assets and expertise. The company manages a dynamic portfolio of natural gas and electric supply, delivery and trading businesses – meeting the energy needs of customers throughout North America and in key markets around the world. Duke Energy, headquartered in Charlotte, N.C., 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.