The largest U.S. civil rights group on Tuesday sued xAI and a subsidiary, claiming ​they illegally operated more than two dozen gas turbines in Mississippi ‌to power its Colossus 2 data centre, ​posing a health risk to local residents.

The ⁠NAACP, represented by Earthjustice and the Southern Environmental Law Center, sued xAI and subsidiary MZX Tech, charging they violated the federal ‌Clean Air Act by running 27 gas-fired turbines before getting necessary air permits for its massive ‌data centre that powers xAI’s Grok chatbot.