DOJ backs xAI, cites national security to defend turbines

The Department of Justice has asked a court to dismiss the NAACP’s lawsuit over xAI’s unpermitted natural gas turbines, arguing that the case "threatens American national, economic, and energy security by seeking to shut off the power supply for artificial-intelligence innovation that supports the Department of War's military operations." The filing frames xAI’s Colossus 2 data center as supporting mission-critical military AI work and seeks to block the NAACP’s effort to stop the turbines.

What did the DOJ say and why does it matter for military AI?

The DOJ told the court that forcing xAI to stop running the turbines would jeopardize national security, and it backed a Defense Department declaration that Grok is one of just four AI models that "support mission-critical operations across Secret and Top-Secret classified networks." Cameron Stanley, the Department of Defense’s Chief Digital and Artificial Intelligence Officer, said the military uses Grok’s Gov model to "support vital national security missions," including as part of recent strikes against Iran. The memorandum and accompanying declarations were filed in the motion to dismiss the NAACP’s April lawsuit.

The DOJ argued the litigation goes beyond a local pollution dispute and could undermine AI systems the Defense Department says it relies on for classified operations.

What is the NAACP’s case and what changed at Colossus 2?

The NAACP sued over xAI’s use of unpermitted natural gas turbines at Colossus 2 in Southaven, Mississippi, alleging the turbines violate the Clean Air Act and harm public health in an already polluted region. The original complaint identified 27 turbines operating without permits at the site. Emails obtained by the Southern Environmental Law Center show that by mid-May the number of turbines at Colossus 2 had risen to 57. The SELC says that growth produced a 111 percent increase in nitrogen oxide emissions, an 83 percent increase in PM2.5 emissions, and an 88 percent increase in formaldehyde emissions since April.

The NAACP also sought a preliminary injunction in May to stop operation of the turbines, arguing the continued use increases risks of asthma attacks and heart disease in nearby communities with high pollution burdens.

How does corporate planning and regulatory interpretation factor in?

xAI has argued that trailer-mounted turbines are exempt from Mississippi air pollution permitting for up to one year. The Southern Environmental Law Center and the NAACP counter that federal law allows trailer-mounted turbines to be considered stationary and therefore subject to permitting. SpaceX’s IPO filing, cited by reporting in TechCrunch, says the company plans to buy another $2.8 billion worth of gas turbines over the next three years, with at least $2 billion earmarked for "mobile gas turbines." The company added many of the new turbines weeks after the NAACP filed its suit.

Why it matters

The DOJ’s intervention recasts a local environmental enforcement dispute as a national security question. If the court accepts the government’s framing, litigation aimed at enforcing environmental rules against AI operators could face a higher bar when agencies or private parties claim national security impacts. That has immediate public health implications for the Memphis region: legal filings and SELC data link the rapid turbine growth at Colossus 2 to steep rises in NOx, PM2.5 and formaldehyde emissions, pollutants tied to asthma, cardiovascular disease and cancer.

The clash also highlights a new fault line between rapid data-center buildouts for large AI models and existing environmental law, with state regulators, federal agencies and community groups offering competing interpretations of how trailer-mounted generators should be regulated.

What to watch

Watch the court’s decision on the Justice Department’s motion to dismiss and the NAACP’s pending request for a preliminary injunction; either ruling will determine whether the turbines stay online while the case proceeds. Also monitor procurement disclosures and SpaceX’s filing activity for evidence of additional turbine purchases, since the company’s IPO filing says it plans to buy another $2.8 billion in turbines, at least $2 billion for mobile units.

Sources: DOJ filing and Defense Department declaration; Southern Environmental Law Center and NAACP court filings; emails obtained by SELC; SpaceX IPO filing details cited in reporting.