Expand your concept of peakers, they can and are used in this manner. Dave's example is a way of storing electric for future use. It has been done in a few of places, though at this point in time they are experiments. The eventual answer is super capacitors, but we aren't there yet. But let's get off of reliable energy. The real savings at this point in time is energy efficiency. LED lighting, daylighing, motion controls, high efficiency boilers, high efficiency motors, variable frequency drives, clean power systems for electric entering a building, capacitor systems for electric in a building, and energy control systems.
Speyside wrote: