I don't understand your calculation, but you came to the right answer, which is all that's important. You can convert between any of these units at www.convertit.com. I get about 12974 kWh. Of course you will have conversion losses in making use of this energy, and water turbine efficiencies can range from 30%-90%. But even at 30% efficiency, that's enough storage to power an average home for 7.5 months! Good luck and I hope you keep us updated!

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