You're going to need a crapload of generators to keep up with that demand of energy from something that outputs 10 eu/t, not to mention a system capable of evenly distributing those over all generators. At that point, you're pretty much better off going with wind or nuclear, although if the amount of space taken up/massive amounts of iron required is ignored, this would probably work pretty effectively for starting out mass fabrication
It's still 6-8 times less iron than windgen, and 20 times less than solars. Space takein is about three times less than windgens, and can be stacked vertically as well.
Nuclears are much more compact, of cause, but cost more in iron (per eu/t), and a lot of copper and gold too. And use finite fuel.
And if you don't have that much iron early, Fillerfarm is scalable both ways - you don't have to build all that gens at once.
On the other hand, Fillerfarm is probably laggy - especially scaffold making part.
So, it is not too OP, but a pretty good option.
Yes, scaffold crafting and distribution is probably most tricky part, but not too much. Even distribution is trivial with Advanced Insertion Pipes, but afaik it is not out yet for 1.3.2.
Still, it can be done with just base BC. I have several ideas, will tell which one is better after testing.