A US regulator ruled on Thursday that Elon Musk’s artificial intelligence company had acted illegally by using dozens of methane gas turbines to power huge datacenters in Tennessee.xAI has been fighting for a year and a half over truck-sized gas turbines the company had parked near its Colossus 1 and 2 facilities, arguing to local authorities that the electricity-generating turbines were exempt from requirements for air quality permits.The Environmental Protection Agency (EPA) declared on Thursd...