Berkshire utility MidAmerican Energy Holdings Co will pay SunPower Corp upto $2.5 billion for the 579-megawatt (MW) Antelope Valley solar projects for designing, installing and constructing them. The company claims it to be the world’s largest photovoltaic power development project expected to begin this quarter and completed by the end of 2015. The projects based in Kern and Los Angeles counties will add to MidAmerican Energy’s growing investments in clean energy. Warren Buffett is renowned for his support of renewable energy and this purchase follows other large deals that MidAmerican Energy has made in the past couple of years. In late 2011 it bought a 49 percent stake in a 290 MW solar power plant in Arizona from NRG Energy Inc, and the 550MW Topaz Solar Farm in California from First Solar. California plans to reduce emissions of planet-warming greenhouse gases to 1990 levels by 2020, and by an additional 80 percent by 2050.