Low efficiency 20GW Pumped-Storage Hydropower System (Water Battery) consumes +20,000,000,000,000kWh of energy p.a.

Manhattan power outage: Parts of New York City plunged into chaos after transformer fire cuts electricity
https://www.independent.co.uk/news/world/americas/manhattan-power-outage-new-york-city-coned-subway-electricity-a9003966.html



http://nymag.com/intelligencer/2019/07/manhattan-power-outage.html