A very large bitcoin mining facility [0] in upstate NY is in an old Alcoa smelter and is powered by a hydropower dam. [1]
The original factory was built to take advantage of the power from the dam. The dam needs a constant draw of power in order to maintain it and smelting potlines were perfect for this.
Today, transmitting the electricity further would be too cost prohibitive due to the remote location. In this case, bitcoin is less polluting energy arbitrage than aluminum smelting.
> In this case, bitcoin is less polluting energy arbitrage than aluminum smelting.
Only if 100% of global aluminum smelting occurred from green sources. As that’s not the case the world would be better off if they had kept smelting aluminum as long as the reductions occurred in less green locations.
