I am a big fan of FTB, but some friends wanted to try some other mods, so we made our own private mod pack to tinker with. We started with some solar panels, then went to LV solar arrays for a while. We have the benefit of Universal Electricity, so I could convert to BC power as needed. But, I did the typical pump lava from the nether via BC pump + tesseracts and soon had a 45-magmatic engine setup going. I knew this would be short lived unless I kept moving the lava pump, and our nether is more dangerous thanks to some of them mods we have installed, so I opted instead to use that power to quarry a lot in preparation to build up IC2 power. We now use 3 HV solar arrays that power some IC2 machines and the rest is converted to BC power and powers everything else we currently use. Of course, this whole setup relies on having Universal Electricity, but I could have instead generated lava via magma crucibles and such and kept using magmatic engines if I hadn't had UE available to me. Having fun with it, just set up an automated Forestry rubber multifarm last night, complete with auto-processing of rubber thanks to an overclocked extractor and applied energistics routing rubber wood into the extractor and sending the rubber back to the storage network. Fun times!