[Ferret Business]ways to produce power

So ppl i'm having problem making power, 4x ore refining eat a lot of RF/t, so what are the ways to produce power in this pack?excluding the thermal expansion dynamos, extra utilities generator and big reactors( it so nerfed that it is useless)

 

I use Mekanism windmills, very reluctantly
You could also use Immersive Engineering

 

Immersive engineering lightning rods+witchery thunderstorm ritual or anything which causes rain or thunderstorm. Fill dozens of resonant cells in a minute.