Data centers often come with their very own natural gas turbines right outside to provide power the grid can't supply. This is what happened at xAI's data center in Memphis.
I don't think you have any clue on the size of the projects being suggested. We are talking 3 times the size of the current texas grid which is twice as large as the California grid. It is a mind shattering amount of power that would be required if it could all be built.