I was playing with 5x5 reactor and found there are 3 ways of making eU
first is with stirlings, giving 0.5 eu per hu, they are relatively safe and easy to put together
second is steam, giving 0.75 eu per hu, complicated to put, expensive and dangerous
third is biogas, giving 0.8 eu per hu, not as complicated like steam, safe as stirlings, and reallly expensive and spacious
main problem is space, 1200 hu 5x5 reactor uses:
12 stirling gens
6 steam gen and 3 steam turbines (if you do not use pipes)
12 fermenters and 60 semifluid generators and a lot of piping
so I suggest a gas turbine, eats biogas and spits ku, energy efficiency should be like normal semifluid generators(or lower), blade should be of advanced alloy + purified iron + obsidian dust mix.
bonus points if gas turbine spits hot air that can be put in a liguid heat exchanger like in real life