A federal judge just stripped the Trump administration of its power to kill a pollution lawsuit on xAI’s behalf. The Memphis-area turbines at the center of the fight are still running.
On October 19, U.S. District Judge Debra M. Brown in the Northern District of Mississippi denied the Justice Department’s bid to dismiss a lawsuit. The NAACP brought it under the Clean Air Act against Elon Musk’s xAI, the company behind the Grok chatbot. The ruling doesn’t decide whether xAI broke the law. It rejected only the government’s attempt to end the case. Brown separately denied xAI and MZX Tech’s own dismissal motion on October 30, allowing the lawsuit to proceed.
Brown’s reasoning cuts against a legal theory the federal government has leaned on all year. The Clean Air Act lets the EPA intervene in citizen lawsuits like this one, she wrote, but intervening is not the same as controlling the outcome. “The EPA’s role as a primary enforcer of the Clean Air Act does not mean that the federal government retains complete control over all Clean Air Act litigation,” Brown wrote. Congress, she added, meant to let private citizens sue even when the government declines to enforce the law itself. According to Earthjustice, which is co-counsel on the case along with the Southern Environmental Law Center, the ruling threw out the DOJ’s attempt to deny the community its day in court.
The NAACP filed the lawsuit in April. It alleges that xAI and its subsidiary MZX Tech installed and began operating 27 methane gas turbines in Southaven, Mississippi, between August and December 2025 without the required permits. They power Colossus 2, the data center supercomplex that trains and runs Grok just across the state line from Memphis. According to the complaint, those turbines had the potential to emit more than 1,700 tons of smog-forming nitrogen oxides a year, likely making the plant the largest industrial source of that pollutant in the Memphis area. That’s a lot of smog. The fleet later expanded, and the plaintiffs now estimate that the plant can emit more than 5,000 tons of nitrogen oxides, over 400 tons of fine particulate matter and more than 47 tons of formaldehyde each year.
Nearby South Memphis neighbourhoods are predominantly Black, and the complaint says the population surrounding the Southaven plant has a substantially larger Black share than the country as a whole. The Southern Environmental Law Center has cited cancer risk in Boxtown, near xAI’s original Memphis data center, at roughly four times the national average. Mississippi issued a permit in March for a planned 41-turbine permanent plant. The lawsuit isn’t about that one: it concerns temporary turbines that the plaintiffs allege were installed and operated without required permits.
The Justice Department invoked national security in June, arguing in court filings that Colossus 2 supports mission-critical military operations and that shutting off its power supply could threaten national, economic and energy security. xAI separately moved to dismiss the suit on other grounds. Brown’s October 19 ruling did not assess the government’s national-security claims. It held that intervention did not give the government the power to dismiss another plaintiff’s lawsuit.
With xAI’s dismissal motion denied, the lawsuit can proceed toward a decision on whether the temporary turbines required permits that the company did not obtain before operating them.
The stakes reach well past one data center. Every hyperscaler is racing to stand up gas-fired power for AI training, from Meta’s turbine deals in Louisiana to the merchant gas plants cropping up around new campuses in Texas and Virginia. All of them are watching to see whether a company can run that generation first and sort out the permitting later. xAI, now folded into SpaceX after the two companies merged in February at a combined $1.25 trillion valuation, has the capital and the political access to make that bet. Brown’s ruling says the bet still has to clear a courtroom, not just a White House.
The NAACP has also asked the court for a preliminary injunction to halt the turbines while the case proceeds. That request is separate from Monday’s ruling and still pending. Until a judge rules on it, the plant keeps running, and so does the exhaust.
Also read: Xbox Manager Says Studio Uses AI Widely Then Deletes His Account • Comcast cut 30 million service calls with AI as it preps cable layoffs • Malware called Volta-Autodoxer uses AI to build a dossier on its victims
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