Construction on the projects began in 2013 and is on schedule for completion by yearend 2015. Southern California Edison will purchase electricity from the projects under two long-term power purchase agreements.

MidAmerican, part of billionaire Warren Buffett’s Berkshire Hathaway holding company, recently installed the project’s one millionth PV module.

With more than 700,000 modules to go for completion, the project is now delivering about 29% of nameplate capacity to the California Independent System Operator, which manages about eight-tenths of the state’s electricity flow.

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