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There are some kind of tool mods, which might help you: Helmod, What is it used for, etc.
Here you find out, which recipes exist, and how to get them running.
If I understand you right, you need fuel for boilers. There are several possibilites:
- Use coke pellets, They give more MJ per coal.
- Upgrade boilers. Each tier give more efficiency, which is quite significant. Same for other machines, which use less energy per product.
- You can dive into Angels Bioprocessing. You can basically create Wood Bricks out of crushed stone using a bit less energy. The modpack seablock is based on that.
- Use solar to save fuel during daytime.
- There are enriched fuel blocks from light oil, which are much more efficient, but i think they are blue science.
- If you are totally desperate, you can use greenhouse. (Dont know, if you get more energy out from running the greenhouses. I think, in marathon mode, it doesnt work out).