In 1.5+:
Generator should be 16 mj/t for 10k ticks, so 160k MJ.
In combustion engine Biofuel is 200k MJ, but over 40k ticks.
In Boiler biofuel is ~292k MJ.
A single reactor creates a bucket of biofuel every 50 seconds. So one reactor can supply 10 Generators 40 Combustion engines, or two 36...