It's worth noting that this is deal that has never been signed previously.

There's a release from DoE about it: https://www.energy.gov/articles/fact-sheet-department-energy...

That's a horrible amount of gas energy generation.

https://www.datacenterdynamics.com/en/news/openai-in-talks-t... has more details. The whole campus build could be as much as $500B.

Would that be the most expensive single thing ever built? The ISS cost around $150B and is commonly said to be the most expensive single item, but that does include running costs.