"The energy in a cubic metre of water raised to a height of 200 metres is about half a kilowatt hour.'
Interesting I double checked that using a rough 1 kg over 1 meter for 1 joule and came out with very similar result as you .
Batteries are obviously better for instant power and being available close to the consumer , pumped hydro better for large energy bulk storage IMHO .
Redflow NEWS & EVENTS, page-1653
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