The BIGGEST problem with clean energy

The thing we don't understand is that, 
Initial Source -> x% converted
Then, during the phase of storage to later use = x * (40-80)% remaining,

And that is the problem we don't store energy, because we cannot sustain it, we have to store TWICE the amount of later need, 

And that was the reason people were so inspired by perpetual motion machine, not seeing them as a energy generator, but as a energy storage. And you believe it or not, every energy storage we want to build, the perpetual motion machine is its ideal scenario.