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The 20 MW Patterson Pass wind energy project is located in the Alameda County portion of the Altamont Pass Wind Resource Area east of San Francisco. It was installed in 1985 by EDF Renewables.
In 2014, EDF Renewables has announced a 20-year Power Purchase Agreement with Southern California Edison (SCE) contracted through the California Renewable Auction Mechanism (RAM) competitive procurement program. The Patterson Pass Wind Project is a repowering effort whereby older technology is upgraded allowing for increased generation of clean energy with fewer wind turbines. Approximately 300 Nordtank and Bonus 65kW turbines, originally installed in 1985, were removed as part of the development process.