The US Department of Justice asked a federal judge on June 15 to dismiss the NAACP's Clean Air Act lawsuit against xAI, arguing that shutting down 57 unpermitted gas turbines powering the Colossus 2 data center in Southaven, Mississippi would threaten both AI development and active military operations. The NAACP filed the original case in April, when xAI was running 27 turbines without an air permit; that number has since climbed to 57, with two more planned, according to the group's June 12 filing.
The turbines feed xAI's Colossus Gas Plant, which in turn powers the Colossus 2 facility that runs Grok. The NAACP wants a permanent injunction halting the turbines, civil penalties of up to $124,426 per day, and reimbursement of legal costs. The group says the turbines can emit ten times the nitrogen oxides allowed under the Clean Air Act when run without controls, raising risks of heart disease, lung disease, and premature death in surrounding neighborhoods with large Black populations.
DOJ's filing did not contest the pollution claims. Instead it argued the suit 'threaten[s] artificial-intelligence innovation, plus the energy needed to power it,' and that cutting power to Grok would damage national security because the model supports Department of War operations.
“The NAACP's attempt to cut off the power that supports Grok also threatens national security because… Grok provides critical support for the Department of War's military operations.”— US Department of Justice, court filing
Key facts
- 01The NAACP says xAI operates 57 unpermitted gas turbines in Southaven, Mississippi, up from 27 when the April suit was filed, with two more planned.
- 02DOJ filed June 15 to dismiss the case, arguing the Clean Air Act's citizen-suit provision cannot override federal enforcement priorities.
- 03Department of War CDAO Cameron Stanley said Grok Gov Model helped deploy 2,000 munitions to 2,000 targets in 96 hours during Operation Epic Fury in Iran.
- 04NAACP seeks a permanent injunction, civil penalties up to $124,426 per day, and reimbursement of fees, citing pollution risks to majority-Black neighborhoods.
- 05Mississippi Department of Environmental Quality classified the trailer-mounted turbines as 'mobile sources' exempt from Clean Air Act permitting.
To make the national-security case concrete, DOJ submitted a declaration from Cameron Stanley, the Department of War's chief digital and artificial intelligence officer. Stanley said xAI's Grok Gov Model, working alongside the Maven Smart System, helped US forces strike targets during Operation Epic Fury in Iran.
Stanley described the operational tempo in specific terms, telling the court the Grok Gov Model has 'unique features not found in any other AI model.' The declaration is one of the most detailed public statements yet about how a commercial frontier model is being used in active combat targeting, and it lands as the Pentagon expands its generative-AI procurement across multiple vendors.
“deploy over 2,000 munitions to 2,000 distinct targets within 96 hours during Operation Epic Fury, a testament to the greatly increased operational efficiency made possible by the Grok Gov Model”— Cameron Stanley, Chief Digital and Artificial Intelligence Officer, Department of War
The legal argument turns on whether private plaintiffs can pursue Clean Air Act violations after a state regulator has signed off. Mississippi Governor Tate Reeves wrote that the Mississippi Department of Environmental Quality approved permits in March 2026 for permanent turbines at the site and authorized trailer-mounted units as temporary bridge power. The department classified those mobile units as not subject to Clean Air Act permitting.
DOJ told the US District Court for the Northern District of Mississippi that 'the Clean Air Act does not authorize citizen-enforcement actions that seek relief the governmental enforcers choose to forgo.' Congress, the filing argued, did not deputize private citizens to 'commandeer the federal enforcement machinery' when the United States has decided a suit would not serve the public interest.
“that xAI should be allowed to break the law solely because the Trump administration says so”— Southern Environmental Law Center, counsel for the NAACP
The Southern Environmental Law Center, which represents the NAACP, said DOJ never disputed the underlying pollution. The group warned that allowing the federal government to short-circuit citizen suits opens the door to 'significant corruption as polluters pay, or give favors, to avoid complying with the law.' Citizen suits, SELC said, are 'an essential backstop—and often a last resort—for communities when government regulators fail to hold polluters accountable.' The NAACP's June 12 filing argued that state-level applicability determinations have never blocked citizen enforcement, and that allowing them to would gut the statute's purpose.
Mississippi has lined up behind xAI. The state told the court that shutting the turbines 'would create an immediate and substantial disruption to the State's economy' and 'disrupt the Clean Air Act's delicate balance of cooperative Federalism.' xAI has not obtained a single air permit for the 57 turbines at any point from installation through today, the NAACP's filing said, and has not implemented best-available control technology or emissions monitoring.
The case is one of the sharpest tests yet of how the federal government will balance AI infrastructure buildout against environmental enforcement. AI Chat Daily covered DOJ's framing of the turbines as a national-security asset earlier this month. With Pentagon contracts now woven into the legal defense of a single data-center campus, the ruling will set a template for how every major frontier-model operator argues for grid and permitting carve-outs. If the court accepts that federal AI priorities can preempt a citizen suit, expect Anthropic, OpenAI, and every hyperscaler with a defense contract to cite this filing the next time a local environmental challenge lands. If it doesn't, xAI faces an injunction risk that no amount of Pentagon support can paper over.
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