Currently, bitcoin network consumes 26 TWh a year or 250 kWh per single transaction and is growing at a rate of over 1% daily (according to this website
https://digiconomist.net/bitcoin-energy-consumption.)
250 kwh (single transaction!) is now roughly the same to to what an average home/household uses in a month.
Is this really sustainable?
If bitcoin should grow even more, how much power will be used just to run it?
i think is minimal since the every miner is mining in mining pool to mine a block so, the total energy consumed is distributed among the miners and besides the miners came from different parts of the world so, the energy costs is varying in every country and some miners are using solar energy to avoid huge electricity costs. In fairness they manage to calculate the energy consumption of bitcoin network very nice