A federal judge in Mississippi has allowed the Environmental Protection Agency to join a Clean Air Act lawsuit over xAI’s Southaven power facility but refused to let the government end the case, keeping the dispute alive without deciding whether the company violated pollution law.
U.S. District Judge Debra Brown ruled Monday that the EPA may intervene in the citizen suit brought by the NAACP and its Mississippi State Conference. But she concluded that the statute does not give the agency unilateral power to dismiss the case merely by entering it, according to Reuters’ account of the order.
The April lawsuit targets xAI and its subsidiary MZX Tech. The plaintiffs’ federal complaint alleges that the companies constructed and operated dozens of gas-fired turbines in Southaven without the preconstruction and operating permits required for a major pollution source. The facility supplies power to xAI’s Colossus 2 data center across the state line in the Memphis area.
Those allegations remain contested and have not been resolved on the merits. The NAACP’s filing announcement initially identified 27 turbines and sought an order stopping unpermitted operations, requiring pollution controls and imposing statutory penalties. A later preliminary-injunction request said six more turbines had been added, raising the alleged total to 33 at that stage of the case.
The Justice Department intervened on the EPA’s behalf in June. Its motion announcement argued that Mississippi had determined no permit was required for the disputed power source and that shutting it down could hinder artificial-intelligence work important to the economy and national security. The government also asserted that executive-branch enforcement authority should override the private action.
Brown accepted only part of that position. The court recognized the EPA administrator’s statutory right to participate but found no Clean Air Act provision authorizing dismissal unless the government is itself diligently prosecuting a related enforcement action. Reuters reported that the judge rejected the broader claim that federal regulators retain complete control over all litigation under the law.
The ruling is procedural, not a finding that xAI polluted illegally or that the plaintiffs are entitled to an injunction. It determines who may participate and whether the citizen plaintiffs can continue presenting their case. xAI did not immediately comment on the new decision, while the EPA also declined Reuters’ request for comment.
The dispute carries consequences beyond one facility. Mississippi has promoted major data-center investment as an economic-development strategy, while nearby residents and civil-rights groups have raised questions about air quality, noise and the speed at which private generation was deployed. The case tests how federal enforcement discretion interacts with the Clean Air Act’s citizen-suit mechanism when state and federal officials support a project challenged by local groups.
For now, the government remains a party, the NAACP’s claims remain pending and xAI’s liability remains undecided. The next substantive rulings—particularly on the injunction request and permitting questions—will determine whether the Southaven turbines may continue operating under their current regulatory status.
