Ok, not exactly like using an overclocker inside the generator, but an item that would increase energy output of generators. For example, each upgrade could increase generator efficiency by something like 10% stacking, up to a maximum of 64. This would help to improve current energy generators while also helping to save build space. Another possible function would be to add transformers (to increase output from the devices) as well as being able to add storage devices to generators themselves. As for the recipe for an efficiency chip, as I'll call it for now, I can't say anything solid since I'm not sure of all the implications behind trying to balance it to keep it useful, but it would most likely have to include glass, insulated copper cables, and an Electronic Circuit. It would also most likely need something like a cooling or lava cell to craft.
After doing a few calculations it would either have to have a lower than 64 stack limit, cost even more than that, or have a lower efficiency return, since with 10% at a 64 stack it would turn out to be 44579% as efficient as the base machine (or the equivalent of just shy of 446 machines). This would make the solar generators slightly less efficient than the Advanced Machines addon, but make all the other generators more efficient. To keep it a bit more balanced probably make the efficiency chips limited to solar, wind, and water generators.
Maybe make the chip something like:
:Bronze Dust: :Intergrated Plating: :Coolant Cell:
:Cable: :Electronic Circuit: :Cable:
:Coolant Cell: :Intergrated Plating: :Bronze Dust:
Where :Bronze Dust: is redstone dust and :Intergrated Plating: is glass.
Anyway, this is just something I'm throwing out there that seems like it would be an interesting idea that would help keep power plant sizes manageable within the addon itself, while adding another dimension to keep people interested. And I can't wait to see what you guys have in the works, especially with MC 1.2 in the works with Jungles and the new crop system