Elon Musk’s AI company xAI, now part of SpaceX under the new SpaceXAI brand, installed 59 natural gas turbines to power its Colossus 2 data center without securing federal clean air permits, according to a Reuters analysis based on regulatory communications obtained through a public records request.
The number is roughly double the 27 unpermitted turbines the company had publicly acknowledged as of January. At least 57 of the turbines sit in Southaven, Mississippi, just across the state line from the data center in Memphis, Tennessee, which supports the Grok chatbot. The facility runs off-grid, a strategy that let xAI build one of the world’s largest AI clusters in record time by bypassing the years-long wait to connect to the electrical grid, and, critics say, the environmental review that comes with it.
The core dispute is a legal one over the word “temporary.” xAI argues the turbines are mobile units, mounted on trailers and slated to move within 364 days, and therefore exempt from Clean Air Act permitting.
But Reuters and environmental groups say they have operated continuously as what amounts to a roughly half-gigawatt power plant. The Environmental Protection Agency closed the mobile-turbine loophole in a January ruling, though it told Reuters it is now weighing “regulatory flexibilities” for portable units. Complicating matters, while Mississippi issued a permit in March for 41 permanent turbines at the site, the disputed units operate outside that permit’s coverage entirely.
The emissions estimates are substantial, though they are projections rather than measured readings. Reuters’ analysis of manufacturer data for 30 of the turbines found they could emit close to 2,500 short tons of nitrogen oxides, 4,000 tons of carbon monoxide and 22 tons of formaldehyde annually if run continuously, far above the 100-ton nitrogen oxide threshold that triggers a federal permit.
The NAACP contends the full operation may be the largest single source of smog-forming nitrogen oxide in the greater Memphis area. These figures represent potential output under continuous operation, a caveat worth keeping in view, but even discounted they point to a large, unpermitted industrial pollution source.
The Environmental Justice Stakes
What elevates this beyond a permitting dispute is who breathes the air. The turbines sit beside predominantly Black neighborhoods in Shelby County, Tennessee, and DeSoto County, Mississippi, areas that already carry disproportionate pollution burdens; Memphis has been named an “asthma capital,” and both counties received failing grades for ozone from the American Lung Association.
Reuters did not conclude these communities were deliberately targeted, but cited a 2022 study finding that historically redlined neighborhoods still face higher pollution exposure today. The NAACP, represented by Earthjustice and the Southern Environmental Law Center, sued in April to halt the turbines, and residents describe turbines audible around the clock. One neighbor’s resignation captured the power imbalance, telling Reuters he could do nothing because Musk “has more money than me.” xAI has offered discounted Starlink service to nearby residents, which critics dismissed as a public-relations gesture.
A Precedent for the AI Buildout
The case has grown into a test of how environmental law applies to the AI boom, and the stakes now reach the federal government. In a June 15 filing, the Justice Department urged the court to dismiss the NAACP’s suit, arguing that restricting the turbines could threaten national security because xAI’s systems support US military operations, including ones involving Iran. That intervention raises the prospect, as an Earthjustice attorney put it, of the government creating “sacrifice zones” where communities are told to accept illegal air pollution in the name of strategic priorities.
The outcome matters far beyond Memphis: scores of off-grid, gas-powered data centers are proposed across the country, often fast-tracked in weeks, and SpaceX signaled in its IPO filing that it plans to buy some $2 billion more in mobile turbines. If courts side with the NAACP and the EPA, the off-grid power strategy fueling much of the AI expansion becomes far harder to pursue. xAI, the EPA and Mississippi regulators did not answer Reuters’ questions about the pollution’s impact on communities of color.
