Buffett firm bets big on solar Warren Buffett's energy company has placed another big bet on solar power plants, spending up to $2.5 billion to buy two facilities under development by San Jose's SunPower Corp. A subsidiary of Buffett's MidAmerican Energy Holdings Co. will own the 579-megawatt Antelope Valley Solar Projects, two power plants that will straddle the line between Kern and Los Angeles counties in the Mojave Desert. Once complete, the plants will sell electricity to Southern California Edison under agreements already approved by California utility regulators.