The Antelope Valley Solar Ranch 1 (AVSR1) is a 230 megawatt (MWAC) photovoltaic power plant near Lancaster within Antelope Valley, in the western Mojave Desert, Southern California. It uses cadmium telluride modules made by the US thin-film manufacturer First Solar. The project was developed by First Solar and later bought by Exelon Corporation in 2011. The solar facility was fully commissioned in April 2014.