Also, lava drains after a while.
Yeap! With Buildcraft pumping in lava you would need to move the pump now and again, with EE just producing the lava cells whole cloth with no need to put in tin or lava, it'll just run nonstop forever. That's the beauty of the system, I could plop it down in the middle of a desert, wire it to a terraformer, put in a hydration terraformer unit, and let it go and it'll do it with out me ever having to go swap out lapitrons or anything. I could come back later and have it done, heck, even swap out the hydration for a cultivation and turn the new meadow into a forest, again, with out having to worry about power, it's endless.