> Running these at full capacity requires 66 TWh a year,

I think your numbers are off.

For a start you are effectively calculating a GPU only number.

I think 100Twh would be the minimum level to think about "all-in". And even that is probably being generous.

Remember, afterall that Google have just bought half the capacity (4.1Twh) of a nuclear power plant in Finland, on top of 630 MW of wind and 94MW of battery.

This is to cater for three new sites at Kajaani, Muhos, and Vaala and expansion at Hamina. So basically 3.5 datacentres.

But Finland is quite a small place. The US has more sites and bigger sites, so the numbers probably grow exponentially very quickly.