Reuters: Southern California Edison said on Wednesday it signed a series of contracts with BrightSource Energy for the supply of 1,300 megawatts of clean solar thermal power. The California utility, a unit of Edison International, continues its practice of buying power from renewable power developers like BrightSource rather than owning the generation assets itself, said Stuart Hemphill, head of SCE’s renewable power efforts. Privately-held BrightSource has agreed to build and place in …