U.S. Asks Judge to Block NAACP Clean Air Act Suit Over xAI Grok Turbines in Mississippi
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Summary
The Justice Department filed a complaint asking a Mississippi federal judge to declare that the NAACP's Clean Air Act suit over xAI's gas turbines cannot proceed over the government's objection, citing national security and the military's use of Grok.
The United States filed a complaint on October 23, 2026, asking a federal judge in Mississippi to declare that the NAACP's Clean Air Act lawsuit over xAI's gas turbines cannot go forward over the federal government's objection, according to the filing on CourtListener. The document, titled "United States' Complaint for Declaratory Relief," was filed in the U.S. District Court for the Northern District of Mississippi in NAACP v. X.AI Corp. (Case No. 3:26-cv-00074). It asserts a crossclaim against the NAACP and the NAACP Mississippi State Conference. These are the government's allegations and legal arguments; the court has not ruled on them.
What the government is asking for
The United States, which is a plaintiff-intervenor in the case, asks the court to "declare that the Clean Air Act citizen-suit provision's authorization for federal intervention includes the United States' right to dismiss NAACP's citizen suit, and that its citizen suit cannot proceed against the objection of the United States." The complaint argues that Article II of the Constitution gives the Executive Branch authority over enforcement of federal law, and that letting a private citizen suit proceed over the government's objection would encroach on that authority. The filing is signed by Department of Justice attorneys, including Associate Attorney General Stanley E. Woodward, Jr., and Andrew M. Darlington as lead counsel. A footnote says the court had directed EPA to file a pleading to meet the requirements of Federal Rule of Civil Procedure 24(c).
The turbine lawsuit
According to the complaint, the NAACP filed its Clean Air Act citizen suit on April 14, 2026. The NAACP's complaint alleges that xAI is violating Mississippi's State Implementation Plan and federal rules because gas-fired turbines powering data centers that support the Grok platform lack certain permits and approvals and are allegedly not meeting emissions-limit, pollution-control, monitoring and record-keeping requirements. The US filing says the NAACP seeks civil penalties of $124,426 per day of violation, payable to the U.S. Treasury, plus an injunction ordering xAI to stop operating the turbines "unless and until [xAI] obtain[s] the required permits."
The complaint says the Mississippi Department of Environmental Quality determined that the state's plan did not require Clean Air Act permits for the turbines, and that the state regulator "has declined any enforcement." It adds that the NAACP disagrees with that determination. The complaint names x.AI Corporation and its subsidiary MZX Tech LLC, which it says owns and operates the power source at 2875 Stanton Road South in Southaven, Mississippi, as defendants in the underlying suit.
Military use of Grok
The United States describes the lawsuit as a threat to national security. It writes that the NAACP "threatens American national, economic, and energy security by seeking to shut off the power supply for Super Intelligence innovation that is essential to the Department of War's military operations." Citing a declaration already in the court record (Dkt. No. 58, Ex. A), the complaint says Grok's continued operation "is a matter of paramount national security" and that the Department of War relies on xAI's "Grok Gov Model."
The complaint also quotes that declaration as saying that during Operation Epic Fury, Grok "enabled U.S. forces to deploy over 2,000 munitions to 2,000 distinct targets within 96 hours." We reported on xAI's earlier statement to the Fifth Circuit that the military relies on Grok for targeting and examined a similar 96-hour claim in The Black Box 013. The complaint adds that the State of Mississippi has determined that continued operation of xAI's data centers and turbines serves the state's interests, and that a shutdown would "create an immediate and substantial disruption to the State's economy."
What is not in the filing
The complaint does not say that any court has found xAI's turbines compliant or non-compliant with the Clean Air Act, and it does not respond to the NAACP's underlying allegations; a footnote says the United States did not intervene as a defendant and is not required to state defenses to the claims against xAI. This filing does not include a response from the NAACP.