Or when it’s cloudy and gray and yucky outside (an estimated 359 days a year here). Wind energy does, however. But only when there is enough so-called Wind (wind) to go around.
German environmentally renewable scientists have now been informed, however, and once they figure out a way to keep it sunny and windy all day long this German energy turnaround thing is going to turn everything around for good.
Because Energiewende has been accompanied by a rapid move away from nuclear power following the Fukushima disaster Germany has had to make up its energy deficit by increasing its reliance on coal for the first time in years. German CO2 emissions have actually been rising over past three years.