I'm not sure if this is a bug, a glitch, or whatever, but running the latest (as of this post) version of Voltz I seem to have found a way to make "infinite" energy, limited only by the number of 240 step down transformers you have.
Does anyone know where I report this? It isn't a "bug" per say, but it does seem like it would be easily exploitable.
Basically, after you build a fulmination cube, you use multiple transformers to run power out of the generator into the batteries.
When testing, I used a 3x3x3 cube, with two missing, and water in the center. One transformer gave me aprox. 83kW. By then using a butt-ton of transformers in parallel, I managed to generate 3.5MW using the same explosive (standard grenade from ICBM).