So, instead you would have to make small energy generation facilities to keep them powered, instead of a very big one?
1x1 uses 10 EU/t, 3x3 uses 8 + 12* 8 EU/t , 5x5 uses 8 + 12*8 + 16*16 ... thats your formula ?
I would rather use 1x1 uses 8 EU/t, 3x3 uses 9*12 EU/t , 5x5 uses 16*25 EU/t. [Increases EU cost exponentially, nearly the same way your does, but increases a bit more]
Exactly. 
Depending on your generation system, and your knowledge about wiring, you can use the setup fits best your lazyness :D.
I would use only one chunkloader as i actually produce 1.5 - 2.5K EU/t on a SMP. [Timmiecraft]
I like the idea of a chunkloader, as I currently don't use a mod that has one.
As for energy, if it took 32/t to load a 3x3 area and 128/t to load a 5x5 area it would take 3.6/t/chunk for the former and 5.1/t/chunk for the latter, a good progression, and very easily providable by a batbox or a MFE respectively.
As for a recipe, how about Tier 2 or so? Require at least one Advanced Machine Block, at least one energy crystal (or better), and at least one advanced circuit, therefore using plenty of iron, coal, diamond, redstone, lapis, and glowstone to drive the costs up. The energy crystal means you can drop another charged energy crystal in it to have it run, and with a transformer upgrade you could drop in a lapotron crystal. A battery probably would die too quickly (10000 EU at 32/t lasts only 15 seconds).
If the costs are high enough with materials that should discourage spamming. The alternatives are either use few of them but more energy (and likely using more diamonds with diamond cables or MFEs), or use less energy but have higher material costs (that is, diamonds). As it says in somebody's sig, balancing a game is to make it hard to decide between two choices.
Sounds quite nice, the existing chunk loaders are too cheap to maintain.
Sounds quite nice, the existing chunk loaders are too cheap to maintain.
Thats why i presented (suggested) it. 
