Running 4 LV generators is actually a fairly efficient way to do it- especially if you have a liquid fuel (oil/methane/biogas/steam), as you can buffer it in a tank elsewhere and pipe it in.
Liquids are also fairly useful in another regard; the Railcraft tank acts like a giant battery, and gives a nice visual as to how much power you've got left. Quick glance in the tank and I know i have enough for say 32 stainless steel; throw it in and walk off. No worries
Steam is probably the easiest to set up, oil has the smallest footprint and very high energy densities (easy to carry if you're manually filling a generator), biogas and methane can be fully automated at a very early stage- giving you hands free running.
Steam is still a good option, Railcraft boilers or the large bronze boiler make enough to run a fairly efficient set up.
If you have oilsands nearby, or a buildcraft oil spout- distil some oil into fuel. Oil is a very potent fuel even without high efficiency processing (distil tower/cracker)- and Greg's fluid cells are useful for carrying liquids about.
You've made some aluminium, so the oil drilling rig is within reach. (batteries are useful for running this).
If you're running renewables like biogas or methane, you'll need more than 4 machines to get a decent amount of power (I think centrifuging methane/making biogas works out around a 6Eu/t gain, discounting any wire/generator losses).
I had 18 distillery for biogas (r
unning just the EBF) and 35 centrifuges for methane (
all the other machines). Still ran low on power at times, but on the whole enough to get by as long as I didn't go overboard.
(didn't start out with that many, just kept adding them as needed)