It is happened on July 25 due to a sunny conditions in southern Germany (where
most of the country’s solar panels reside), and storms across northern Europe
(most of Germany’s wind turbines have been installed in the north). On that
day wind and solar generated 40.65 gigawatts (GW) of power.
Combined with
other forms of renewables, including 4.85 GW from biomass and 2.4 GW from
hydropower, the total reaches 47.9 GW of renewable power — occurring at a time
when peak power demand was 61.1 GW. Renewable sources accounted
for 27.8 percent of Germany’s power consumption in 2014, up from 6.2
percent in 2000. Read more at http://thinkprogress.org/