Headlines in Bloomberg’s on Monday stated: ” Germany just got almost all of its power from renewable energy” (http://www.bloomberg.com/news/articles/2016-05-16/germany-just-got-almost-all-of-its-power-from-renewable-energy). Solar, wind and hydro were supplying the energy used. As stated, 42.5 Gigawatts of it’s demanded 42.8 Gigawatts were taken care of at 2pm Sunday afternoon. I don’t know if it was a particularly windy or bright day, but as the article alludes, this is a very dynamic event and likely to not be reproduced on a regular basis for right now. Since solar and wind are up and down in supplying energy throughout a 24 hour period, there always has to be other energy sources that can immediately be put online and metered- like coal as Germany has been largely dependent on the last couple years. Some source has to be able to be the go between of high-low demand swings throughout the day, and between high-low production/generation hours. Also, electrons are borrowed and siphoned off from/to other countries along the continental grid system.
So it is a mathematical representation that backs Germany’s claim of receiving all of it’s energy needs from renewables at 2pm on May 15th. As analyst Monte Depraetere stated, “If Germany was an island, with no export cables, this would be technically impossible because you always need to have some thermal generation running as a back up supply for when the wind or solar drops off”.