Topaz Solar Farms is a 550 megawatt (MWAC) photovoltaic power station in San Luis Obispo County, California, United States.

The $2.5 billion project includes 9 million CdTe photovoltaic modules based on thin-film technology, manufactured by U.S. company First Solar.

On August 14, 2008, Pacific Gas and Electric Company announced agreements to buy the power from Topaz Solar Farms and High Plains Ranch.

[8][9] In late October 2010 the San Luis Obispo Department Planning and Building released a Draft Environmental Impact report.

The First Solar project was not able to close its conditional loan guarantee with the Department of Energy prior to the September 30 deadline, but it has gone ahead anyway.