It's kinda cheesy and a little expensive to build, but basically free to run. You can run big reactor turbines using MFR steam boilers. With one MFR lava fabricator, a fluid transposer, 10 MFR boilers, and 2 80 blade turbines. 5 boilers are needed per turbine(80 blades with enderium blocks). The lava fabricator feeds a buffer tank on top a fluid transposer set to fill buckets. Ender IO conduits pull full buckets, send them to the boilers, and then return empty buckets to the fluid transposer. Use a tesseract or super laminar fluiducts to move the steam. The lava fabricator only uses 4k rf/t so you end up with around 50k rf/t net gain in power.