You can't look at the total acreage of the state as a metric when 64.4% of the state is owned by the federal government.
The proposed site is twice the size of Manhattan, NY and sized for 9GW of energy which is more than the entire state uses yearly. We literally do not have the water to support a data center that huge.
They just enacted a fireworks ban because the weather people just had to create a whole new category for how dry and dangerous it is. Air quality is a constant problem because all the pollution from regions West of Utah collect right against the mountains. A few years ago we woke up to what looked like heavy fog, but it was smoke --from Siberia.