Duke-American Transmission Co.

We bring together the strengths of two leading electric industry companies to build, own and operate new electric transmission facilities throughout North America.

Duke-American Transmission buys stake in 84-mile California transmission line

CHARLOTTE, N.C. – Duke-American Transmission today completed its previously announced purchase from Atlantic Power of 72 percent of the capacity of Path 15 – an 84-mile, 500-kilovolt transmission line in central California.

The nine-year-old line connects the state’s northern and southern transmission grids, playing a key role in maintaining statewide electric system reliability and market efficiency.

Pacific Gas & Electric owns 18 percent of the line’s capacity through its ownership and operation of the connecting Los Banos and Gates substations.

The remaining 10 percent is owned by Western Area Power Administration, which will continue to operate and maintain the line.

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About DATC

Duke-American Transmission Co. is a transmission developer equally owned by Duke Energy and American Transmission Co. DATC was formed in 2011 to plan and develop strategic transmission projects across the U.S. and Canada. For more information, visit: www.datcllc.com.

About Duke Energy

Duke Energy is the largest electric power holding companies in the United States. Its regulated utility operations serve approximately 7.1 million customers located in six states in the Southeast and Midwest, with approximately 32,000 miles of line. Its commercial power and international business segments own and operate diverse power generation assets in North America and Latin America, including a growing portfolio of renewable energy assets and transmission projects in the United States.

Headquartered in Charlotte, N.C., Duke Energy is a Fortune 250 company traded on the New York Stock Exchange under the symbol DUK. More information about the company is available at: www.duke-energy.com.

About American Transmission Company

American Transmission Co. is a Wisconsin-based company that owns and operates the electric transmission system in portions of the Upper Midwest. Formed in 2001 as the nation’s first multi-state transmission-only utility, ATC has invested $2.8 billion to improve the adequacy and reliability of its infrastructure. ATC now is a $3.3 billion company with 9,480 miles of transmission lines and 529 substations. The company is a member of the Midwest ISO regional transmission organization, and provides nondiscriminatory service to all customers, supporting effective competition in energy markets without favoring any market participant. For more information, visit atcllc.com.