It just holds a lot of power.Great pack, love it, but there is something I would like to add.
The MineChem chemical synthesiser (the thing you use molecules and atomns in to make stuff) takes up infinite power and, if given enough, will even go in negative power. This can suck up your entire reactor and still not function correctly... Aside from this there appears to be a thing with redstone meltdown, but that may have already been patched...