"Wind Generators produces free energy, but are expensive and don't have a steady output."
its not a bug, if you keep watching the "temperature" of the turbines, you will notice that he oscillates with the time.
if you read the Item description of the turbines, they produce an AVERAGE of 66% of the maximum power output. It means the turbines can touch the 100% maximum output but can touch the 33% as well.
I have a base running 100% on these turbines that consumes 350 MW of energy, i have 100 huge turbines running and 50 huge accumulators (bio industries) that gives me 15 GJ of energy buffer. I can consume 600 MW for 1 min before accumulators go dry, works like a charm.
The current default of AVERAGE energy generation of the turbines are, 4000/400/40 KW
I can give you 2 tips/options:
1 - Build a energy buffer, like accumulators, to store the energy high peaks of the turbines and use when the turbines are low on "wind".
2 - If you think produces low amounts of energy, Change the settings in Mod Settings-> Startup -> wind strength.
I hope with this explanation you will enable once again my wonderful and nearly perfect mod, build some accumulators and be happy forever !!