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Just to play devil's advocate, how much energy could be saved by closing all bank facilities and backend systems etc, in case they wouldn't be needed anymore?

Would BTC mining consume more or less energy then today's mainstream solutions?

Do not forget the energy expended by the employees necessary to run the bank, i.e. housing, commutes, food, etc.

Unless you plan to kill the ex-employees after closing the bank, I'm not sure why this is applicable ;)

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