You'd need twice as many panels because panels generate very little power at night whereas the dam continues to run. Also you'd need a battery bank to hold hal

You'd need twice as many panels because panels generate very little power at night whereas the dam continues to run. Also you'd need a battery bank to hold half a days worth of electricity. You could try pumped storage... oh wait this is kinda the problem here isn't it, so that's not happening. Theoretically a drought would have more sunny days and less water, so solar and dam do loosely speaking work together although the coupling isn't that tight for a long river.