You're linking to an article from 2014.
Current data indicates coal usage is virtually unchanged.  

August 2017 stats (Germany's gigawatt production)
Hydro 5.6    (2002 = 4.9)
Wind  51.7   (2002 = 13.3)
Solar 41.7   (2002 = .3)
Coal  28.3   (2002 = 28.3)