What Are the Data Centers For?

This Utah data center was originally slated to be 62 square miles. This is an incomprehensible size to me. I know there's power facilities and such, but this seems very big.

Can anybody here explain to me how to do the math and model the calculations for these?

I have been to big Colo facilities but I don't know of anything even approaching this scale. How much compute is estimated to be in these? Do we even have enough chips to fill these?

How much AI compute is needed and for what industries? What is the capacity of the data centers planned for the next 5 years vs total compute capacity today?