- Use EnderIO Stirlings instead of ExtraUtils Survivalist Generators, they cost less for a higher power density even before upgrades, and coal is plentiful for reserve fuel.
EnderIO Stirling Generator produces 20Rf/t with 2x fuel consume rate
While Survivalist Generators only produce 5Rf/t and in long term are more efficient (80k Rf per coal)
The Furnace Generator from XU produces 40Rf/t, but a lot less efficient than the survivalist (20k Rf per coal)
All three need redstone so you already need at least an iron pickaxe to build any of them, but the Stirling Generator and Survivalist Generartor are mostly build out of stone, so resource wise it's a lot cheaper. However a Furnace Generator only costs 14 iron ingots which you should already posses at this point.
The first things you normally want to hook up to a power system is an ore processing system. If we're still going with Ender IO, you'll need both a sag mill and alloy smelter. Both machines require 20Rf/t, so a single stirling engine without upgrades does not produce enough power to power both. Upgrading it with a Double-Layer Capacitor bumps it up to 40Rf/t but u already need an Alloy Smelter and Sag mill to make it.
So either you build to stirling engines to power the machines and both feed them fuel, or you build 8 Survivalist Generators, who'll build a ton of RF in your absence, or you make a single Furnace Generator and just feed it whenever you need the machines.
Also remember that the XU generators are better upgradable than Ender IO
- Stirling Generator + Octadic Capacitor = 80Rf/t
- Survivalist Generator(8x) = 40 Rf/t
- Survivalist Generator(64x) = 320 Rf/t
- Furnace Generator(8x) = 320 Rf/t
- Furnace Generator(64x) = 2560 Rf/t
For those who do not know Extra Utilities (XU); Survivalist Generator(8x) does not mean you need to have 8 generators (you do for the recipe) but the 8x recipe compacts the generator so it'll still only take 1 block of space.