the rather uninformed question I had: but answered in comments below
was why not solar ? Yeah Hydrocarbons have no competition if you have to deploy power quickly
1.2GW is a small turbine - compared to the land & battery needed for Solar.
how about Gas ? if you're building in the middle of nowhere ? & there's no gas lines ?
If you just paid a jillion dollars for a shiny new AI datacenter, would you be ok with just running it during the day?