I'm here to suggest a few (ok, not really, it would be a huge one ^^) changes on the Storing energy system.
This is described by 1 line:
Making storage more expensive and HAVING LOSSES (and reducing max storage capacity for each storing machine).
I mean, consider a MFSU receiving 1 000 000 EU. Instead of giving you back these 1 000 000 EU, it would give you back 250 000 EU. That would also need Upgrades, that would increase efficiency (from 25% to 35% for example), total storage (and being cheaper for their cost than building another storage device) or even max Input (but not output).
What would be the point of it ? At first, making EU-Network more "realist". In the "with more real problems/benefits" meaning. What would be these problems ? A Solar Pannel/Wind Mill wouldn't be as cool as it is now, because you wouldn't be able to store properly your Energy. And that would buff Fuel-based energy, since you can decide to use when you need energy.
Of course, it would probably require a buff of every generator, just to avoid people from complaining ^^.
Obviously, I guess it won't be implemented ever in the game. But just think to it, I think it would be more balanced. At least, we can hope GregoriusT would like to implement something like that in Hardcore configs ^^. (in this case, think of LESU as a 100% efficient storage unit, it would makes it really useful, because for now it isn't ^^).