Well, the "promoted" way would be Coal -> Oil/Gas -> Nuclear -> Fusion.
Feeding a single boiler with 30 charcoal/min should be possible without too much lag and equals about 300EU/t. Enough to reach MV age withoug much trouble. Oil from other mods is usually quite limited for GT usage. You usually use up one source within a few hours. But the GT Oil drill can supply much bigger amounts. It is just annoying to search for a good oil chunk. Turning it into nitrodiesel should get you to 500-800EU/t quite easy. IC2 Biogas can reach similiar outputs when using a Destillation tower, but that is likely still too expensive for you. Then next are IC2 Reactors. Recently i boosted their output a lot, but made them also more expensive to build (Titanium = EV Tech). A simple EU output Thorium reactor can reach 224EU/t, using a fluid mox reactor cycling cooling cells and GT Highpressure Turbines i could reach about 8800EU/t from 4 Quad Mox cells.