True, but higher demand for heating in winter is not specific to Germany. In the end, Germany will likely need to import energy anyway - just as it does today. But this means this question may not be the most relevant.
It will be a mix. There is certainly still a lot which can be done on the demand side, e.g. when to cool a cool storage house during the day, or when to run certain production lines.
No, capacity factor is a distraction. The only meaningful question is whether it is cost effective or not compared to other production methods,, and solar - taking into account the low capacity factor - is starting to look very good.
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