Can anyone think of any odd generator types? IC2 has pretty much all of them apart from oil and gas.
Perhaps a thermopile? The only logical generator I could think of that is worth using.
Antimatter is simply unviable as it would need to be extracted out of the magnetosphere, which would take a huge amount of time and effort
Some kind of solar boiler I guess, creating steam
It might be a better idea to focus on the whole steam thing anyway though, for the nuclear reactors.