Gerators that need fuel should be buffed?
Sure if you use only IC then you're propably right. Since anything that requires your attention all the time just simply isn't fun to use so wind/solar/water are simply better than coal/geo/nuclear.
But if you use any other mods alongside with IC that allows automation then balance turns upside down.
generation/tick iron tin copper lapiz glow
Generator 10 8 4 0,5
Geothermal 20 10 4,5 0,5
Nuclear 2000 184 122 320,5 20 20
Solar 0,5 10 4 0,5
Water 0,25(4) 4 2 0,25
Wind 1,6(3,78) 12 4 0,5
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EU/iron Notes
Generator 1,25 Easy to setup and automate, treefarm required
Geothermal 2 Easy to setup and automate, lava required
Nuclear 10,87 A bit more complicated, eats lots of uranium
Solar 0,05 Very easy to use, Idiotproof, fire and forget
Water 0,0625 Unmanned version produces a bit more than solar, but setup is pain in the ass and not worth it
Water(auto) 1 Easy to setup and automate, requires water buckets and concept is ridiculous
Wind 0,125(0,315) Takes time to build and normal coal plant is vastly superior
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Personally I use only normal generators and geothermal early game and automate those as soon as I can. And when I can afford it and have enough uranium turn to nuclear power.
I'd like to use early also windfarms just because they look cool and are fun to build but since I don't want to bother with them breaking constantly I just don't play with them.
Windfarm:
32 generators, 50 LVTs, 2MFE (for internal storage and to make sure 0 energy is wasted during high winds and storms), 216 copper cable and 12 gold cable
100% maximum effiency and 0% losses
128EU/t lossless cable with lenght of 200 costs around 250 copper and 12,5 gold (50LVTs, 100 copper cables, 50 gold cables).
Breaks all the time.
Average output: 120,96EU/t


Coalplant:
48 generators, 8 LVTs, 1 MVT, 50 copper cable, 8 gold cable
100% maximum effiency and 0% losses
Average output: 480EU/t, burns 2,4 pieces of coal per second

Geothermal would be even easier. And feeding lava is propably easier for most than building a good treefarm / superfuel production line.
Windfarm would actually be feasible early before you can start building bigger geothermal / coal plants, but since it breaks constantly and you would have to bring it's efficiency to 1/3 to get around that annoyance it just isn't worth it anymore.
TL;DR Fuel using generators are vastly superior to wind/solar/water already.