I don't know if this adds or detracts from what your saying but here in NZ 13% of power usage is aluminium smelting. 44% is industry, 32% commercial and 24% residential. Transmission loses 6% (not sure why the above totals add up to 100%, so it must exclude the losses).

https://en.m.wikipedia.org/wiki/Electricity_sector_in_New_Ze...