It is really annoying that there is just a snowflake mod that simply refuses to allow its generators to power objects from other mods. It's also really annoying that this mod doesn't allow generators from other mods to work on it's machines. These two annoyances drive so many people away from industrialcraft.
I think it is even better that IC2 energy is not compatible with RF mods, because in this way it's clear that the player must develop not only 1 type of energy production (RF), but also others.
The energy of IC2 is its feature.