Quote from TRod
buildcraft.BuildCraftEnergy$1BiomeIdException: You have a Biome Id conflict at 215 for oilOcean
Open the Buildcraft config in notepad and change the biome id of oilOcean at the top of the file. I don't know the limits on biome ids, so don't go too high.
It may be because it's 1.7.x that mods that normally don't conflict, have.