Maybe if you have more than one storage device hooked up with each other in such a way, then they will balance the electricity in them. However it doesn't do it like 100Eu=100EU, it'll use a percentage of the energy storers maximum capacity!
That causes Lag, and its useless. And dont forget that you can put them in a row for that case.
Aaaaaaaaaand it's denied
It should not be something that is done automatically, but by a machine activated by redstone or player input.
But yeah i don't see many uses to this to actually support some sort of implementation.