On June 16, the US Department of Justice filed a legal memo siding with xAI in an environmental lawsuit brought by the NAACP. The argument wasn't about permits or exemptions. It was about war. According to the DOJ, Grok is one of four AI models running mission-critical Pentagon operations, including "recent strikes in Iran" — and that makes xAI's data center power supply untouchable.
At the center of the dispute: 57 trailer-mounted natural gas turbines operating without federal air quality permits at xAI's Colossus and Colossus 2 data centers near Memphis, Tennessee. xAI has claimed a one-year exemption under Mississippi state air pollution rules. The NAACP and the Southern Environmental Law Center filed suit in April, arguing that exemption was written for small equipment — not for a fleet of 57 industrial generators powering one of the largest AI clusters in the country.
The pollution data backs the plaintiffs. Since xAI's data centers went online, Memphis has recorded increases in three specific pollutants: PM2.5 particles (linked to stroke and Alzheimer's disease), formaldehyde (a cancer risk), and nitrogen oxides (associated with asthma and heart disease). The Memphis metro was already one of the most polluted in the US before xAI arrived.
xAI has also announced plans to purchase another $2.8 billion worth of gas turbines over the next three years, with at least $2 billion earmarked for mobile units — the same trailer-mounted type at the center of this lawsuit.
The DOJ memo sets a new legal template. If a court accepts the argument that an AI company's data center is military infrastructure exempt from civilian environmental law, every AI firm with a Pentagon contract has a ready-made shield against regulators. The government didn't just defend xAI — it put a legal theory on paper that other companies can now cite. The outcome of this specific case is still open. The precedent the DOJ just created is not.
