This was 2014, so it may be different in 2015, but is a reasonable benchmark: https://www.ise.fraunhofer.de/en/downloads-englisch/pdf-files-englisch/data-nivc-

This was 2014, so it may be different in 2015, but is a reasonable benchmark: https://www.ise.fraunhofer.de/en/downloads-englisch/pdf-files-englisch/data-nivc-/electricity-production-from-solar-and-wind-in-germany-2014.pdf https://www.ise.fraunhofer.de/en/downloads-englisch/pdf-file... You can see that during 2014 the minimal combined solar and wind production for a day was just 0.022 TWh (just 4% of maximum combined wind and solar). While generally it was around 0.2TWh, the risk of dropping to almost no production means that Germany still can't really rely on wind and solar and still has to significantly rely on coal and gas (especially gas, since it is most flexible).