US judge lets NAACP's Clean Air Act lawsuit against xAI over Colossus gas turbines go ahead

A federal judge in the Northern District of Mississippi on Friday, 30 October 2026, denied xAI’s motion to dismiss a lawsuit brought by the NAACP over the gas turbines that power the company’s Colossus AI data-centre complex near Memphis, TechCrunch and CNBC reported.

The claims

The Southern Environmental Law Center, representing the NAACP, alleges that xAI and its subsidiary MZX Tech installed and operated at least 35 combustion turbines and other pollution sources at the site without the required preconstruction or operating air permits, in violation of the Clean Air Act. According to CNBC, the complaint says 27 turbines were installed in Southaven, Mississippi, between August and December 2025.

xAI’s arguments and the ruling

xAI argued that the turbines were “mobile” and therefore exempt from permitting, that the plaintiffs lacked standing, and that such citizen suits are unconstitutional. Judge Debra M. Brown rejected all three points, writing that the plaintiffs have statutory standing, that the turbines are “not ‘mobile sources’” under Mississippi’s implementation plan, and that the citizen-suit provision does not violate Article II of the Constitution.

Earlier in October the same court refused to let the US Department of Justice intervene and dismiss the case. The ruling does not decide whether xAI broke the law; the case now proceeds, and the court has not yet ruled on the NAACP’s request for a preliminary injunction.