Usually, landfill is made from stone and doesn't have any fuel value. But if both your mod and Wood to landfill are active, landfill (that made from stone and that made from wood) has a fuel value of 40.0MJ.

While it does make sense that you can burn a heap of wood instead of dumping it into a hole, I find it hard to believe that you can burn a pile of stone just as easily. Perhaps it would be better if landfill could never be burnt? Could you do that, please? :-)

Dirty power should now use the minimal "potential burn" energy if an item has multiple recipes (it still ignores recipes that yield more than one product).

Updated while sleepy, let me know if something dumb bugs out.

Thanks for the quick fix! So far, I didn't encounter any bugs yet. :-)