That great to hear,wind turbine will be a good addition to the mod. I had in mind something similar to the way basic electric miner and steel electric miner worked. Where mk1 vs mk2 is a minor improvement which requires to tech up to steel gear, plate and all.
Maybe just adding a mk2 boiler and steam turbine which produce 20-40% more power would be good enough to offer more power option before going to nuke power. Oil based power would be nice yet I understand it would need lots of work to be done. Keep up the good work we are all very excited for k2.