Solar biggest source of electricity in Germany in June

In June, solar provided more electricity to Germany's grid than any other source of power.  And the second largest source was wind.   It's true, June was a month of extreme heatwave with cloudless skies, but this is likely to be the new normal as global temperatures rise.  Note that zero carbon generation made up 63.3% of total generation in June.

Germany electricity generation by source, June 2019
Source: Fraunhofer

In January, solar contributed just 2%, but wind compensated by producing 28%, so total zero-carbon made up 60% of total electricity generation.  Day by day, and seasonally, wind and solar tend to be inversely correlated—think winter gales vs balmy summer days. 

Here's what it looks like for the first 6 months of this year.  Zero carbon made up 60.5% of total generation.  In 2018, zero-carbon made up just 53.8% of total generation, the year before 51.3%.  In 2010, renewables made up just 19.2% of generation.  This year 47.4%—the percentage of renewables is rising by on average 3.1% per annum, meaning that Germany could reach 100% renewables by 2035. 

Germany electricity generation by source, January to June 2019
Source: Fraunhofer

BTW, I think it a mistake for Germany to close down nuclear electricity production.  New nuclear is horribly expensive, but existing nuclear is not.  The alternative to nuclear, and cheaper than new nuclear power, is to produce green methane using surplus renewable electricity, via the Sabatier process.  We can also make green methane from biodegradable materials via anaerobic digestion.  The methane is stored for winter use as heating and for generating electricity.  Although there are small Sabatier reaction power-to-gas plants in Germany, their scale isn't yet large enough to provide for seasonal storage.