I was wondering about that, so I may indeed be mounting cannons on my future airship.
I've also been debating how to turn EE energy into IC2 energy. Namely, there exists "energy collectors" which upgrade fuel when they have light. There's about a dozen steps, but basically charcoal becomes coal becomes alchemical coal becomes mobius fuel becomes aeternius fuel. Each of these can be broken to 4 of the former. So 1 aeternius = 4 mobius = 16 alchemical = 64 coal = 256 charcoal (4 stacks). Each coal or charcoal produces 4,000 IC2 energy. If you're splitting it for breeding, then you have 255 usable charcoal and 1 sent back to regrow. That's 1,020,000 usable IC2 energy per aeternius fuel.
Now, an EE energy collector produces 40 EMC per second, and aeternius is 8,192 - 32 for the charcoal means there's 8,160 energy that needs to be harvested to go directly from charcoal to aeternius. That's 204 seconds, or 3:24 to produce a stack. That's a very even 5,000 IC2 energy per second produced from a single Mk3 Energy Collector, although this can also be cut by 1/4 if you choose to burn coal instead of charcoal (255,000 total energy - 1,250 per second).
I believe at these ridiculous numbers, you start outperforming several nuclear power plants.
Although I'm wanting a Nethership. I've decided that the Nether has had it too nice for too long, and I must do my dwarven duty, and occupy it. The concept behind the Nethership involves a LOT of resource gathering. Because of nether ore, it's very possible to produce a LOT of resources via IC2, with each nether ore producing 4 dusts, but this will also consume a lot of energy to run through all the grinding and smelting. So I'm planning to include an EE->IC2 coal generator, run the airship's machine shop entirely on coal-burning generators, include thermopiles to produce RP2 energy for the frame motors, and instal a few lasers. Yes. Lasers.