AI datacenters are very far from the typical electrical load of a cloud datacenter, no existing data center has planned appropriately for this because we're only now discovering the bad effects it's having on the grid

Funnily enough AC usage is very easily modelled because it's a well understood distributed load, directly linked to weather. Plus large modern buildings should be built with grid aware AC that adjusts load based on grid demand anyway. I know Siemens and Ericsson both have commercial solutions for that, so I imagine there's more I don't know about.