Interesting. The graphs on that website do not agree with the ones on Wikipedia. For example, for coal in 2016 Wikipedia says ~220 TWh but Strom says ~135 TWh.

EDIT: I see my mistake. I did not add both brown (~135 TWh) and black coal (~100 TWh) together (surprised to see those broken out, but it's a valid difference). In that case, the numbers still do not agree, but at least they are comparable.

[0] https://strom-report.de/strom/#stromerzeugung-deutschland-20...