Near as I could figure it, Fraunhofer doesn't do coal, they only offer renewables (solar and wind) so it's not relevant. Here's a result from Google showing in chart form the last ten years or so of German electricity production (2005 - 2014):
Over the ten year period shown in the first chart non-carbon-emitting green nuclear production is down, renewable production is up and CO2-emitting coal and lignite production is not changing very much. The lowest production was in 2008 and 2009 during a world-wide recession.
As I said before, the non-carbon nuclear supply (currently about 95 TWh) is going away totally by government diktat in 2023. The projected increase in renewables will probably cover that loss in generating capacity (although renewables aren't a good replacement for baseload generation without lots of expensive storage or backstop fossil-carbon gas CCGT) but it means Germany will be still burning lignite in ten years time at the same rate it does today to keep the lights on. It's either that or freeze in the dark.