if this happens, all that will happen is an increase of light.
Which of course could cause problems. It apparently would last for a few weeks tops, so you know. 'Indoor farms' could be made, powered by solar panels perhaps, wind would still happen, chances are that at first there would be more, given the 'extra sun' is sudden and also supplies heat, but then after a bit it would go back to normal. So wind power would work. Coal, nuclear, water, etc., all of those energy sources would still work. The only thing that happens is extra sunlight for a bit, that's all. We'll obviously have to adjust, but who cares, it's just for a bit, as said before.