I'm fascinated with energy production too, but unsatisfied with battery storage for energy. The losses are high, and the replacement costs plus limited lifetime for chemical batteries really make it a tough sell to me.
A technology I'd like to see developed more is flywheel storage. A heavy flywheel cylinder in a vacuum mounted to magnetic bearings w/ a coil wound into it that can either be used to inductively accelerate it (when you have power coming from wind/solar) and then be used to extract energy from it when those sources aren't on. It's a moving part, but built right, could probably last decades. Batteries have a very Logan's Run-esque hard-kill date.