Y, wake me up when you reckon you can pump/store enough water to keep a city alive all night:
Kareeya power station has a head pressure of 1,000 ft on it's turbines and still uses quite a lot of water to generate 88 mW, an amount totally inadequate for a large city. You guys have no concept of scale, of the AMOUNT of power we consume.
Watso, they have used weights to power cuckoo clocks for centuries.
