xAI's Colossus supercomputer raises environmental and health concerns in Memphis
xAI's Colossus supercomputer has been powered by 15 gas turbines in Memphis since June 2024, emitting hazardous air pollutants that reportedly exceed EPA limits. Approximately 22,000 residents were not informed of the emissions, and the local health department has not yet approved xAI's permit to operate the turbines through 2030.
What happened
xAI has been operating 15 gas turbines to power its Colossus supercomputer facility in Memphis, Tennessee since June 2024 without prior notification to the community or regulators.
Each turbine emits 11.51 tonnes of hazardous air pollutants (HAP) annually, exceeding the U.S. Environmental Protection Agency limit of 10 tonnes per source. Formaldehyde is among the pollutants emitted.
Reported impact
Approximately 22,000 people live within a five-mile radius of the facility. Residents were not informed about the turbine emissions operating for months.
The Southern Environmental Law Center criticized xAI for lack of transparency with the community and local leaders about the project's effects on air quality.
Index analysis
The turbines are 20 years old and xAI seeks authorization to operate them continuously from June 2025 to June 2030.
Governance controls
The Shelby County Department of Health has not approved the operating permit and stated there is no defined timeline for approval. xAI did not conduct public notice or oversight during initial deployment.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.