Sonnenseite explains that with solar beating wind in installed capacity (now over 30 GW) it is now the generation method with the most installed capacity in Germany.
Wind is at about 29 GW, coal has 21, gas 20, lignite 17 and nuclear (to be phased out) 12.
These numbers for conventional generation are different from that of the latest Grid Development Scenario (at page 8). It has coal at 26.3, gas at 26.6, lignite at 20.2, and only nuclear also at 12.1.
But 30 GW solar beats all of that anyway.
Of course, with only 900 hours a year of full capacity production, solar still lags behind when comparing the electricity actually produced. But it is of interest to note that it already has the most capacity, which will continue to increase.
Lenz Blog 