From my experience. I used improved windmills for early game power. They do about 40RF/t each which is better than the solar gens (and less complicated to craft). If you have an array of, say 8 of them, especially with the help of water wheels then it'll run your base's basic needs till you start getting into quarrying.
It doesnt sound like a lot of power but you'd be surprised at how useful it is since it's basically 'free' power that needs no maintenance once its set up. And with a few resonant energy cells the stuff you don't use just keeps filling the cells when you're not using your machines much.
You can use steam dynamos to augment your base's power needs if you're doing something intensive like making machine frames in the BC laser assembler table. If you don't have a charcoal factory, this will eat through your coal quite heavily
When I played on an earlier version of Infinity, I went right for a biodiesel farm which could output nearly 24KiRF/t from a single harvester (running 6 diesel gens. 10/10/10 sugar cane and pumpkins, 2 sets of refinery+squeezer+fermenter) and was more than enough to power an ender quarry with upgrades. At that time the diesel gens did 4KiRF/t each. Were expensive (all that steel!) but worth it. Nowadays I don't recommend diesel gens due to the fact that they are nerfed to only output 1KiRF/t because they run at 1/4 speed.
I'd go for steam dynamos running off of a charcoal factory or cul gens with beef wellingtons. The Draconic Evolution generator is a superior option to steam dynamos if they're still relatively easy to make in inf hard.
