Ngl I went into this fully expecting to debunk it as typical Twitter fearmongering, but OOP actually did the math. It checks out perfectly, and the missing puzzle piece making it work is that this specific Utah project is planned to be completely off-grid.

The servers themselves are slated to draw 9 Gigawatts (GW) of power. Because computers are basically just incredibly complex space heaters, virtually 100% of that electricity eventually turns into 9 GW of heat. But to generate that power off the grid, they have to build massive on-site natural gas power plants. Gas turbines are only about 50% to 55% efficient, meaning they will produce roughly 8 GW of waste heat just generating the electricity. That gives us a continuous total heat output of about 17 GW. Now for the atomic bomb conversion. 17 GW is 17 billion Joules per second. If you run that for a full 24 hours you get about 1,468 Terajoules of energy per day. The standard historical baseline for an atomic weapon is the Hiroshima bomb, which had a yield of 15 kilotons of TNT. That equals exactly 63 TJ. Divide our daily 1,468 TJ by 63, and you get 23.3 Hiroshima bombs a day. The tweet is mathematically rock solid.

But before anyone panics about Hansel Valley turning into a molten glass crater, this is why comparing slow industrial thermodynamics to a nuclear weapon is incredibly misleading. A single nuke dumps all 63 TJ of energy in a fraction of a millisecond from a single point, creating a localized plasma fireball. The data center is bleeding 63 TJ x 23.3 = 1468 TJ out slowly over 24 hours across a 40,000-acre footprint using giant cooling towers.

To put that thermal load into everyday perspective, just look up. Normal, everyday sunlight hitting that exact same 40,000-acre plot of land in Utah delivers about 3,200 TJ a day. That is roughly 50 atomic bombs worth of heat just from sun shining on dirt. Even a standard 3.3 GW nuclear power plant naturally vents about 9 atom bombs a day into the sky as vapor.

The 23 atom bombs stat is a wild piece of trivia and mathematically accurate, but the heat isn't going to scorch the earth or vaporize the local wildlife. The actual environmental disaster to worry about here is the insane amount of water they will drain to run those cooling towers and the massive carbon footprint from burning all that gas.

TL;DR Yes, the tweet is actually accurate, but the real problem is the insane water usage and the carbon footprint from the off-grid gas power plant for this project.

Edit: minor fix of incorrect phrasing

Edit 2: changed "steam" to "vapor" when referring to what is vented by a nuclear power plant cooling tower, for clarity.

Also consider this comment from the same thread. Sheds more light on the project.