No, that is entirely configurable in the config files.According to the PowerConvertors thread you can convert 100 MJ into 243 EU. Well, say goodbye to steam turbines then.
I would assume that they would put something that would not break the turbines and the netherrack > lava > EU.
Because that would go against their guidelines from "suggest mods", the lowering the cost for doing the same thing.
Here, it would be lower the cost and the infrastructure, and would render many contraptions useless.
That was based on that that there were some discussions in the thread.
I think we can at least trust the FTB team enough to not ruin other mods by adding this one.