Re: Great article
@itzman - "a capacitor displays a falling voltage as it discharges"
And a reservoir displays a falling water level (gravitational potential energy) as it discharges.
Sure, the grid voltage stays pretty constant, but it's a regulated output, and see what happens if you let the water level fall to half the height between the upper and lower reservoir (i.e., the upper reservoir and part of the feed pipe is dry)...