Until you do concentrated solar thermal using molten salts to store heat to drive a generator. See this announcement of one of the world's largest solar plants:

Until you do concentrated solar thermal using molten salts to store heat to drive a generator. See this announcement of one of the world's largest solar plants: http://electrek.co/2016/05/03/worlds-largest-coal-supplier-building-one-of-worlds-largest-solar-power-plants/ http://electrek.co/2016/05/03/worlds-largest-coal-supplier-b...