xAI's unpermitted gas turbines at Mississippi data center spark pollution lawsuit
The NAACP sued xAI in April 2026 alleging the company is operating unpermitted natural gas turbines at its Colossus 2 data center in Mississippi in violation of the Clean Air Act, endangering public health in a pollution-burdened community. xAI expanded the number of turbines from 27 to 57 after the lawsuit was filed, and the DOJ intervened in support of xAI, citing national security interests in AI systems that support military operations.
What happened
The NAACP filed a lawsuit in April 2026 alleging that xAI is operating natural gas turbines without permits at its Colossus 2 data center in Southaven, Mississippi, in violation of the Clean Air Act.
The original lawsuit identified 27 unpermitted turbines, but emails obtained by the Southern Environmental Law Center showed that as of mid-May, 57 turbines were operating without permits at the site, with many added after the lawsuit was filed.
The DOJ intervened in the case on behalf of xAI, arguing that the turbines are vital to national security because they power AI systems including Grok that support military operations.
Reported impact
The NAACP alleges that the continued operation of unpermitted turbines increases risks of asthma attacks and heart disease in communities already experiencing heavy pollution burdens.
Natural gas turbines emit fine particulate matter (PM2.5) linked to heart attacks, high blood pressure, and premature deaths in people with preexisting conditions.
Index analysis
The case involves a conflict between state and federal environmental law interpretations, with Tennessee and Mississippi regulators claiming xAI has a year to run unpermitted turbines under a Clean Air Act loophole, while the NAACP and EPA dispute this claim.
The DOJ's intervention on national security grounds represents a clash between environmental protection and AI infrastructure expansion supporting military capabilities.
Governance controls
Tennessee and Mississippi regulators granted xAI limited permits to operate some turbines; xAI was granted a permit to run 15 turbines in Memphis until 2027.
The NAACP filed for a preliminary injunction to stop the turbines' operation pending the case outcome.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.