Dozens of off-grid gas plants built for data centers raise air quality concerns

The AI boom needs electricity, and it needs it yesterday. Rather than wait years in utility interconnection queues, data center operators are taking a shortcut: building their own natural gas power plants, often with minimal permitting and little public input.

According to data from Cleanview, at least 57 off-grid natural gas plants have been proposed or built specifically to power data centers across the US. Their combined capacity sits at roughly 73 gigawatts, enough to power tens of millions of homes.

The Colossus problem

No project illustrates the tension better than xAI’s Colossus facilities in Mississippi. The company’s Colossus 1 site began operations in June 2024 using up to 35 gas turbines that were, at the time, unpermitted. Partial permitting only came later, after legal pressure forced the issue.

The sequel is even bigger. Colossus 2, located in Southaven, Mississippi, features 27 gas turbines capable of generating up to 495 megawatts. The facility was installed without initial permits.

The potential emissions from the Colossus 2 site alone paint a grim picture: more than 1,700 tons of nitrogen oxides (NOx) per year, 180 tons of fine particulate matter (PM2.5), 500 tons of carbon monoxide, and 19 tons of formaldehyde.

In April 2026, the Southern Environmental Law Center, Earthjustice, and the NAACP filed a lawsuit seeking to shut down xAI’s Mississippi operations entirely. The legal argument centers on the facility’s operation without proper air quality permits and the resulting health risks to surrounding communities.

A national pattern emerges

Mississippi isn’t an outlier. Similar projects are cropping up across the country. Texas has the GW Ranch project. Virginia has Vantage. Together, at least 11 gas-fired projects linked to data centers could produce more than 129 million tons of annual greenhouse gas emissions.

Unlike traditional emergency diesel generators, these setups operate continuously and have raised significant environmental concerns, especially in communities already grappling with air quality challenges. Communities near these facilities often learn about them after construction has already begun.

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