RotaryCraft is my go-to "industry" mod, so one of the first things I do when starting a new world is automating ethanol production. I have a sugar cane farm harvested by either a Thaumcraft golem or a BC Robot; then, 1 out of every 3 sugar canes are turned into sugar to be sent to the first Fermenter to make yeast. (I get the dirt from a composter which uses some of the yeast and SC, combined with some method of automatic sand production from cobblestone.)
Then, the yeast is sent to the second Fermenter to be processed with the rest of the sugar cane, and the resulting Sludge is cooked (Steam engine + Friction heater) into Ethanol. Boom, an endless supply of furnace fuel and early-game RotaryCraft power.
Keyword: Early-game. Ethanol alone doesn't cut it for very long. Later on down the line I try to automate the production of Jet Fuel, which requires Netherrack dust, Tar sand, Blaze Powder, Magma Cream, Ethanol, and Coal. Here's how I do it:
Netherrack dust: Quarry the Nether -> Netherrack -> Grinder. It's technically nonrenewable, but close enough that it really doesn't matter.
Tar sand: Tar Sand is tricky. You have 2 options: Put BC Oil on a Drying Bed, or run Soul Sand through a Grinder. I favoured the first option until very recently, when Reika added a renewable way of getting Soul Sand. The setup is: Sand + Lubricant -> Liquefaction machine -> Soul Sand -> Tar Sand
Blaze Powder: A bog-standard Blaze farm. There's at least half a dozen perfectly viable ways to do this. My personal favourite is using a Corporeal Attractor combined with an RoC Mob Harvester.
Magma Cream: This one's also tricky because it requires Slimeballs. If you have TiC installed, you can autofarm the Slime trees; however, if you're like me and don't have it because you like Vanilla enchants, you can use a Thaumcraft Thaumatorium to combine Aqua (burn some of the Sugar Cane and use the Herba to run a Lamp of Growth) with Victus (Small Natura berry farm) to make them.
Coal: Wither Skeletons aren't just good for their skulls, y' know. They also drop Coal. So you just have to swipe a Skeleton spawner somehow, put it in the Nether, and set up an autofarming system. The Spawner Controller or something from Botania whose name I can't remember will make it work even when you're not around.
Ethanol: See above.
At this point, it's just a matter of funneling it all into a max speed Fractionator, and soon you'll be swimming in the pink stuff that will fulfill all your power requirements for a very long time! Unless things have changed in a recent update, one gas turbine into a few Rotational Dynamos generates more than 11k RF/t.
...At least, until you delve into ReactorCraft. But don't even get me
started on that. I have yet to make a reactor that produces power without exploding.