TWENTY NUCLEAR POWER PLANTS - Fifty Percent of the nation's energy needs.

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41. German Power Grids Increasingly Strained

Some observations are possible from the charts above and other evidence:
•Wind power peaks seem not to be simultaneous with PV peaks. This means that PV does not add its full peak capacity to the grid problems during high wind periods.
•The main part of the German wind power is installed in the northern part of the country while the main part of the PV capacity is installed in Bavaria. The nuclear moratorium has created the most serious supply problems in the southern part of Germany. This observation suggests additional PV generation to relieve the supply problems.
•PV generation cannot reduce the need for peak capacity. The reason is that there is no PV generation during the evening peak load.
•The regulating work which must be made by controllable power sources grows considerably with the growth of wind power and PV. TenneT is one of Germany’s 4 main grid operators. In the TenneT area a calculation for April 2011 has shown that wind power alone would extend the regulating range by more than 50%, while the actual combination of wind power and PV has doubled the regulating range.

http://www.theoildrum.com/node/9205