I used to use wind power, but with the power system changes in IC2, that made it a bit nonviable (without a tremendous amount of work). The problem with wind power is that you need to transfer power a LONG way. It can be done, but this takes a lot of advanced stuff to do this efficiently.
But that is ok. No more wind power. We got Solar power. I never much used them, but I can adapt. So I make solar arrays and all that and I am happy.
So now I playing the current version of IC2, 1.337 and starting a new world. So I go to make some solar generators and guess what. Now they are expensive as hell. TWO Circuits? That is a lot of resources for a new world (to get a decent amount of them). OK... FINE... Ill just build half as many and take much longer to get my power systems. I do not like it, but OK. So now I make my smaller solar array and it is day time. Hmm. I am not getting any power. Why is this? Oh wait, another feature has been added. If it is raining, you get NO POWER. So now solar power much more expensive and doesn't work nearly as often due to the rain. The way weather works it can rain All day.
I really must protest this. I do not like this. Please reconsider this. For rain, you can just reduce the efficiency a bit, maybe .75 EU or .5 EU per tick when it is raining.
Id also ask that you just use one circuit for solar power too. It is already expensive enough with all the tin, iron, and redstone needed.
I really like this mod, but I swear sometimes I think the motivation for some changes is almost vindictive. I just want to have fun and I do not want some hard core experience. Maybe you could put this as an option in a config file. My challenges come from building grand projects and IC2 and Buildcraft are simple tools to help me do so.