Elon Musk’s xAI keeps expanding its power setup for the Colossus supercomputer cluster. Internal emails reveal the company installed 19 additional natural gas turbines at its Southaven, Mississippi, site between late March and early May. The move pushes the total to 46 portable units at the facility. And it comes while the NAACP and environmental groups press a federal lawsuit claiming these machines run without required air permits.
The turbines deliver hundreds of megawatts. The original 27 units alone generate 495 megawatts. Enough capacity to supply electricity for roughly 400,000 homes. Eight of the newest turbines, exceeding 200 megawatts, arrived after the NAACP filed suit in April. xAI shows no sign of slowing its buildout for AI training that now supports Grok and deals with partners such as Anthropic.
But the pace has alarmed residents near the site. Southaven sits just south of Memphis in a region already burdened by poor air quality. DeSoto County and Shelby County both earn failing grades for ozone pollution from the American Lung Association. Local communities, many in historically Black neighborhoods, worry about added smog, particulate matter and toxic chemicals.
The Southern Environmental Law Center and Earthjustice represent the NAACP in the case. They argue xAI operates what amounts to an illegal power plant. Federal law demands construction and operating permits for large stationary sources of pollution. Mississippi regulators classify the trailer-mounted turbines as temporary and mobile. That label lets the company run them up to a year without full air permits. Lawyers call the interpretation a loophole that violates the Clean Air Act.
In February the NAACP sent xAI a notice of intent to sue. The company responded by adding six more turbines, bringing the unpermitted count to 33 at one point. Those six rank among the largest on site and carry the highest pollution potential. By early May the total reached 46, according to the Mississippi Department of Environmental Quality. Mississippi Today first reported the updated figure after MDEQ confirmed the numbers.
Emissions estimates paint a stark picture. The 33 turbines cited in the May injunction request could release 2,508 tons of nitrogen oxides a year. That volume would likely make the site the largest industrial NOx source in the greater Memphis area. They could also emit 236 tons of fine particulate matter, 837 tons of carbon monoxide and 25 tons of formaldehyde. These compounds link to asthma attacks, heart disease, respiratory illness and certain cancers. “Toxic emissions from the facility threaten to do long-lasting harm to nearby communities,” the Southern Environmental Law Center stated in a release.
Ben Grillot, a senior attorney at the Southern Environmental Law Center, put it plainly. “We’ve warned xAI for months that its operation of unpermitted gas turbines violates federal law. But instead of fixing these issues, xAI installed six more massive turbines to its personal power plant, increasing the amount of illegal pollution that it can pump into nearby communities.” He spoke in a statement tied to the preliminary injunction filing.
Abre’ Conner, the NAACP’s director of environmental and climate justice, expressed deeper frustration. “It’s absolutely crazy. Any company that disregards the obvious environmental and health concerns of Black communities to supposedly power a future that will help us all is sending a clear message about who it intends to serve in that future.” Her words appeared in WIRED, which obtained the internal emails through public records requests by the Southern Environmental Law Center.
Laura Thoms, Earthjustice’s director of enforcement, added to the criticism. “We put these companies on notice that their toxic air pollution is both dangerous and illegal. Rather than stop, they’ve added more turbines capable of inflicting even more harm to the surrounding communities. We’re asking the judge to halt all unpermitted pollution and make sure xAI follows the law to protect people put at risk by their illegal operations.”
xAI defended the equipment in its legal response to the injunction request. The data centers “are essential to the operation of artificial intelligence and other computing tools used by the U.S. government and millions of users worldwide, every day. But those data centers cannot currently function, and would have to precipitously shut down, without the temporary power generation equipment in question.” The filing did not address the permit dispute directly.
Mississippi regulators stand by their approach. Jan Schaefer, an MDEQ spokesperson, told Mississippi Today that all portable turbines come equipped with control technology to minimize emissions. “MDEQ is evaluating the situation and will make the facility aware as to when it can no longer bring additional portable/temporary turbines on-site.” The agency says xAI notified it of the recent additions only this week, even though the company faces no requirement to report each new unit.
In March state permit writers approved plans for 41 permanent gas turbines at the same Southaven location. The Southern Environmental Law Center appealed that decision and seeks a hearing. SELC maintains the turbines at the heart of the lawsuit fall outside that permitted group. Neither xAI nor MDEQ answered questions from WIRED about whether the 19 new units hold coverage under the March approval.
This episode echoes events at Colossus 1, the first phase across the state line in Memphis. There xAI relied on as many as 35 unpermitted turbines during early operations in 2024. After the NAACP threatened legal action, the company removed the disputed units and secured permits for 15 others. Local health officials granted approval despite vocal opposition from Memphis residents. Training workloads later shifted to Colossus 2, where the pattern now repeats on a larger scale.
The stakes stretch beyond one data center. AI models grow more compute-hungry each quarter. Power demand outstrips what many utilities can supply on short notice. Natural gas turbines offer a fast, if dirty, bridge. They arrive on trailers, fire up quickly and generate the steady electricity racks of GPUs require. Yet the approach bypasses years of environmental review designed to shield communities from industrial pollution.
Drone footage and public records previously obtained by Floodlight showed turbines operating at the Southaven site weeks before the March permit arrived. That evidence fueled early claims of premature operation. The NAACP’s latest injunction request asks the court to order an immediate stop to all unpermitted turbine use. A ruling could force xAI to idle significant capacity or accelerate efforts to obtain full permits and install advanced controls.
So far the company shows little inclination to pause. Its Southaven campus continues to grow even as the lawsuit advances through federal court in northern Mississippi. MDEQ says it monitors the situation. Environmental groups counter that monitoring after the fact does little to protect families who breathe the air today. The dispute tests how far regulators will bend for a high-profile technology project and whether federal clean air rules still hold weight against rapid AI expansion.
Community leaders in the area voice familiar concerns. They have watched industrial polluters arrive, operate under exemptions and leave lasting health effects. This time the polluter carries the banner of artificial intelligence and national competitiveness. The contrast sharpens the debate. Economic boosters highlight jobs and future tech leadership. Opponents point to children with asthma and seniors at risk of heart attacks from elevated particulate levels.
xAI has invested more than $20 billion in the Memphis-area facilities with support from Mississippi Governor Tate Reeves. The governor’s office has welcomed the project as an economic win. Yet that backing has not quieted the legal or community pushback. The NAACP lawsuit seeks not only an injunction but also civil penalties for each day of alleged violation. A final judgment could carry significant financial consequences.
For now the turbines keep spinning. Internal spreadsheets list megawatt ratings for each unit and track total power output. Those numbers rise week by week. The legal filings grow thicker. And the air over Southaven and North Memphis carries whatever the machines release. The coming months will reveal whether courts force a slowdown or whether xAI’s urgent compute needs continue to override permitting timelines.
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