Duke Builds Largest Storage System With Xtreme at Wind Farm

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Duke Energy Corp., a U.S. utility that operates 986 megawatts of wind-energy capacity, selected Xtreme Power Inc. to design and install the world’s largest power-storage system linked to a wind farm.

The 36-megawatt storage system is expected to cost $44 million and will go into operation in the third quarter of 2012, Charlotte, North Carolina-based Duke said in an e-mailed statement.