Worked my way through bronze age producing steam with 14 solar boilers, feeding water from two Railcraft water tanks.
Stepped into EU-Volts with a Basic steam turbine, bender, wiremill, assembling machine, canning machine.
Then I wonder how to step-up to more power for a blast furnace and other higher tier multi-blocks.
I have Forestry, Railcraft and Stevecarts along side GregTech.
I could start wood multi-farms with BC power, hoping it is autonomous enough. Though It needs constant feed of fertilizer and a significant amount of water.
I may be able to feed a Large Bronze Boiler with charcoal, and produce steam for some large Steam Turbines. Though I am not sure of setup size for a proper multi-farm and water sources. It may be bulky then.
I could try to build a solar powered Steve Cart farm, with less issues than a Forestry Multi-Farm.
I can't think of a useful sustainable oil pumping, distilling, diesel generation.
Multifarming fruits, stilling Bio-Ethanol, maybe in the future. It takes long and significant bee breeding, then advanced tree breeding, some fruit farm and sapling farm. May be workable as mid-end game, but not in early stage.
I could go solar, though, even enabling leveled panels (overpowered stuffs), it is a long route before producing a significant amount of solar power.
I can't imagine hiring slave Steeves to harvest/mine fuels for any sustained amount of time.
IC2 crop automation is no more, or very limited even adding IHL.
Gregtech Oilberries are a prank at best, even with high stats. You better centrifuge soulsand than wait days to harvest 4 berries into a single oil bucket.
Pumping, transporting and processing oil require so much infrastructure, it is a joke unless you can fly, help equip oversea wells with angel blocks, tessseract energy and fluids. I would not build kilometers long rail networks, energy networks and equip oil wells with BC or GT pumps for 5-11k buckets of oil. (seashore oil wells pumping is still broken with BC pumps as it stops as soon as a water source form over an oil block while descending the well)
What do you use as fuel sources and Eu-Volt generation?
Special note for GregoriusT about Diesel:
Mr Diesel invented his engine to work on seed-oil.
It was only after economical and oil companies lobbying pressure he adapted his Diesel engine to work with mineral Oil.
These are true historic facts most Germans should know about Diesel.
Please, enable seed-oil as Diesel fuel with same energy density. You may require filtered or processed seed oil to get it right.
Though, Diesel engines are cleaner when operating on seed oil rather than mineral oil. (much less carbon and zero sulfur in exhausts).
To make it simple and avoid adding yet another fluid, just allow filtering seed-oil into diesel. Could be by mean of an additional distillery recipe.
Input seed oil, output fuel, glycerol, niter and optionally tiny bits of plants.