Alcatraz one of largest microgrids in U.S.

Alcatraz Island is home to one of the nation’s largest microgrids, according to the U.S. Department of Energy. The island is equipped with a solar-diesel hybrid power system that most visitors probably won’t notice. Its 305-kilowatt (kW) solar array sits on top of the main prison building and is hidden from public view to preserve its historical integrity. The solar panels connect to a battery bank and power inverters that help power the island instead of relying solely on diesel generators. This $7.1 million project, originally funded through the American Recovery and Reinvestment Act, has reduced the island’s fuel consumption by 45 percent since its 2012 installation. It also saves more than 25,000 gallons of diesel fuel a year in the process, proving historical preservation and renewable integration is possible

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