It's an interesting game but I feel like some of the mechanics are unclear. For example, I can see how much power I have but I have no idea how much power I need. I try to increase renewables and sell my fossil fuels, and it looks like it works well for a good while but the suddenly my power will drop very fast until I lose. I get that there must be something I don't really understand, does the power demand spike or increase as the game goes on?