This EIS evaluates the environmental impacts from DOE’s proposal to issue a federal loan guarantee to Royal Bank of Scotland to provide funding to Topaz Solar Farms, LLC, to construct and start up the Topaz Solar Farm, a nominal 550-megawatt photovoltaic solar energy generating facility. The facility would be located in unincorporated eastern San Luis Obispo County, California, approximately one mile north of the community of California Valley, California, and six miles northwest of the Carrizo Plain National Monument.