SpaceX's xAI Data Center Operating Unpermitted Gas Turbines
SpaceX's xAI subsidiary operated 69 gas turbines without air permits at its Colossus data center near Memphis, Mississippi. The NAACP and Southern Environmental Law Center sued over the unpermitted turbines, which reportedly emit over 2,000 tons of smog-forming NOx annually. SpaceX agreed in July 2026 to remove all turbines by July 2027 as it transitions to a permanent natural gas power plant.
What happened
SpaceX's xAI subsidiary operated 69 mobile gas turbines mounted on flatbed trailers to power its Colossus AI data center complex near Memphis, Mississippi, without obtaining required air permits. SpaceX claimed the turbines qualified for a temporary-mobile exemption allowing operation without permits for up to one year because they remained on trailers.
In April 2026, the NAACP and Southern Environmental Law Center sued xAI alleging the company was operating unpermitted turbines and polluting surrounding communities. Federal regulations stated the turbines required permits regardless of their mounting method due to their size and intended use.
In July 2026, SpaceX agreed with the Mississippi Department of Environmental Quality to remove all 69 turbines by July 2027, beginning removals in August 2026 as a permanent 1.2 gigawatt natural gas power plant with 41 authorized turbines comes online.
Reported impact
The unpermitted turbines had the potential to emit more than 2,000 tons of smog-forming NOx per year in a region already among the most polluted in the United States.
Index analysis
The turbines were operated as part of xAI's infrastructure to power training and operation of its Grok models and to provide computing capacity to other AI companies like Anthropic.
Governance controls
The United States Department of Justice sided with SpaceX in the lawsuit, characterizing the matter as one of national, economic, and energy security related to AI innovation supporting military operations. A permanent power plant with 41 turbines was authorized under a Clean Air Act permit granted in March 2026.
Classification
Sources and evidence
This record was researched and written by the Index, based on the following original reporting.