The OP's suggestion is overpowered.
Say though, that perhaps you could make a device so powerful it could open a rift in spacetime in your universe, and attach it to the space of another universe, pull the matter in the other universe through and through cold fusion generate a huge amount of energy. Since we don't really have "other universes" in Minecraft (I don't count the nether, nobody cares about that godforsaken place), we have no moral obligations to NOT suck the living daylight out of a mythical universe we will never see.
So, I propose a Rift generator. This is a big one. Think about all those enormous chasms in Minecraft. They are very odd formations, definitely unnatural looking. I think the Rift generator should be some sort of matter harvesting/fusion tool whose containment field is imperfect, causing massive gravitational rifts in nearby MC space. These temporary rifts are so powerful that they open massive chasms and wreak havoc on the surface. To walk the surface nearby a rift generator would tear your body to shreds from the extreme forces. It would take an enormous amount of energy to start, on the order of 10 MFSU's full or more. The charge up time would take many days. Parts of the machine would permanently overheat, meaning the machine must shut down or tear a rift within its containment field (oh, am I talking about the force field generator? hmmm!).
As we step up through the tiers of power in Industrialcraft, we harvest more and more energy from the environment. Eventually we step up to the point where we have the potential to permanently destroy things (nuclear reactor). They possess deadly power, and the logical successor to that would be the potential for greater damage. The Rift generator would create such a vortex of chaos near its operation that it would be required to be operated in a force field, and probably require extremely careful management unless you want your base wiped out of existence. This is Ultra-science, and it is a field I really want to step into. Industrialcraft makes us laugh at the primitive dangers offered to us by Minecraft. With quantum technology, the environment and creatures can no longer do us harm. This step is actually necessary to throw some spicy danger back into Minecraft! And there is so much opportunity for special effects.
Obviously, we would want the generator to provide more power than we put into it, especially at such a great cost to our nearby environment. Perhaps over the course of a MC day it would provide three hundred million EU or so. With 10 MFSU's going in is 100 million, plus the cost of [expensive] components that take time and resources to replace, plus the energy cost of the force field, plus the extreme devastation that occurs outside your field, 300 million EU doesn't seem so unreasonable.
Oh, and there would be no way in hell something as comparatively weak as Reinforced Concrete would survive the rift. This would have to be a sacrifice... a sacrifice for science. And no, you wouldn't be able to pipe the energy away from the generator, because the wires would be destroyed as well.
I've already said too much... I hope I didn't bore anyone with my long-winded idea. I'd be happy to talk with anyone about it if they are as excited as I am about these big super-science projects.