The Department of Justice has formally intervened in an environmental lawsuit against xAI, backing the artificial intelligence company’s deployment of dozens of unpermitted natural gas turbines near its Memphis data centers. The litigation, initiated in April by the NAACP and the Southern Environmental Law Center, challenges the company’s reliance on trailer-mounted generators, arguing they bypass federal emission standards. In a memorandum filed on Monday, the DOJ sided with xAI, cautioning that court-ordered power restrictions could undermine American national, economic, and energy security. The department highlighted that xAI’s Grok model underpins mission-critical defense operations, including recent military strikes in Iran, framing the infrastructure as vital to strategic capabilities. xAI currently operates 57 mobile turbines at its Colossus and Colossus 2 facilities, more than doubling its generator count since late last year. The company maintains that its equipment qualifies for a one-year regulatory exemption because it remains trailer-mounted and has not operated continuously for twelve months. Opposing counsel contests this classification, asserting that federal law treats such deployed units as stationary sources subject to standard air quality controls. Environmental advocates note that the Mississippi-Tennessee region, already among the most polluted in the nation, has seen deteriorating air quality since the data centers reached full operational capacity. The turbine expansion has driven measurable increases in particulate matter, formaldehyde, and nitrogen oxides, pollutants clinically linked to respiratory, cardiovascular, and oncological conditions. Despite legal challenges and environmental concerns, xAI, now a SpaceX division, plans substantial infrastructure expansion. SpaceX’s recent IPO filing indicates an intention to allocate up to $2.8 billion over the next three years for additional gas turbines, with at least $2 billion earmarked for mobile units to support projected AI workload growth. The DOJ’s intervention highlights an emerging regulatory fault line between rapid artificial intelligence infrastructure scaling and environmental compliance, as courts and agencies grapple with the legal classification of emergency power sources amid surging computational demand.