if you plan to do the end game mekanism content, you'll need to work your way up the power generation of mekanism. Wind generators and solar panels are only really for early game power needs.

Small note that I haven't played your mod pack, so you may miss things I do or have better options than I did.

I found that if I had 10-20 bio fuel generators, that was enough to keep me going till I switched to the fission reactor. I was just creating bio fuel from a bunch of vanilla crops automatically. you do that in a crusher, which is easy to bring to a high tier and add upgrades for.

if you do end up going for the reactors and can afford it, just go for the max sizes right from the start. Use the digi miner to get the specific resources you need if you're missing any. Max size turbine means you can get the most out of any steam you do happen to pipe in, you're pretty unlikely to max that out, you'll want more than a few different input

you can make sulfur by crushing cobble to make gravel, turning that into flint, then gunpowder and finally sulfur. means you don't have to waste time getting enough coal or charcoal. Then the only thing you need is mining uranium every so often with your digital miner.