Sempra Generation built the plant from January 2010 to December 1, 2010, at a cost of about $141 million., although it appears this is just for 48 MW expansion
At its construction peak more than 350 workers were installing the 775,000 First Solar panels on the 450-acre (180 ha) site.
An expansion of the facility by more than 200 MW was approved in 2010. On August 4, 2011, Sempra announced a plan to expand the facility by 92 MW to be online in January 2013 and another 58 MW to be added by 2015.
Copper Mountain Solar 3 is the third phase of the Copper Mountain Solar complex. Construction on the 250-megawatt (MW) solar project began in 2013 and when complete, the solar plant will be capable of generating enough electricity to power about 80,000 homes.