So, I am currently using a geothermal-based energy system, and have increased geothermal energy to double its normal value so that 1 lava cell gives 50k EU at 50 EU/t. I am looking, however, at a steam-based system that uses railcraft steam engines and steam turbines powered by boilers. Lava gives 1k heat, NEI says, compared to the 50k EU. If I was to switch to fuel-burning steam boilers (fuel gives 96k heat, 96 TIMES more powerful that lava!) which would be more efficient? And is nuclear still the best of them all? I am not really worried about transfering energy as te Electrical Engine allows me to use EUs as MJ, and the boiler will give me access to both steam engines and turbines, for MJ and Eu respectively. But I do need help choosing!