At first, please do not say "NO!" without reading it, maybe it's OP, maybe not, just talk about it ... this is a SUGGESTION, I do it in order to discuss and not because I want to see it in the next version of IC² ...
It's an beta-test Idea
So, my idea is to create a new way of energy storage, cheaper that MFSU/MFE for the same cost, but with using a lot of space more ...
It won't use diamond, but LapisBlock (as for Lappack) Glowstone Block (better than Glowstone Dust) and others ...
And the most important thing: it (the LESU or Lapis Energy Storage Unit) would be able to share energy with others LESU, i.e. when you rightclick on, you'll see one GUI, but the maximum energy storage would be the addition of all the LESU storage ... of course, each LESU would need to be connected on at least one face to another LESU for sharing the same GUI.
For example, if you make a 3*3*3 cube of LESU, you'll get a storage capacity of 27*Max-Energy stored by 1 LESU.
To have ouput, it would need a special LESU, crafted as the normal one but maybe with a transformer and the ouput would be only on the good face of THIS block.
With that, you could make a big area to store energy, cheaper than MFSU, but it would need a lot of space.
For Ouput/Input/Tier, I propose to create 2 level of it, one Tier II and one Tier III
Exemple of setting:
=Any source of energy, windmill or not.
=Basic LESU
=Ouput
Then, when right-clicking on of these LESU, you'll see appear a GUI with 18*150 000 (for example) =2 700 000 EU max and one slot to charge your lappack.
For repliers:
[Craft] For craft Idea (with the tier, output and input)
[Usage] For people thinking it's useful/totaly unuseful
[WantMorePrecision] For people who did not really understand
[Other] If you find an other reason to answer.