- Rep. Frank Pallone requested records on turbines, emissions, permits, government communications, power consumption and water use at the Colossus data centers. [1] - The July 29 letter asks SpaceX to arrange a committee staff visit to its data-center and power sites in Tennessee and Mississippi. [1] - Reuters found that 59 turbines had been installed for Colossus 2 without federal clean-air permits; xAI and Mississippi regulators argue the temporary units are exempt. [7] - SpaceX did not respond to Reuters’ request for comment on the letter. Its Memphis website separately says misleading claims have circulated about Colossus.
[1][9] The top Democrat on the House Energy and Commerce Committee has asked Elon Musk for records and a tour of SpaceX’s Memphis-area artificial-intelligence data centers and associated power sites, adding congressional scrutiny to the environmental and utility disputes surrounding the Colossus computing cluster.[1][2]
Rep. Frank Pallone Jr. of New Jersey sent the letter on Wednesday, July 29, seeking information about turbines used for Colossus 1 and Colossus 2, emissions data, permitting records and communications with government officials. He also requested company analyses of emissions, power consumption and water use, and asked to arrange a site visit for committee staff.[1]
Pallone broadens an inquiry after a staff meeting #
Pallone said SpaceX, which owns xAI, did not provide sufficient information during a meeting with committee staff in June. His letter shifts that exchange into a written oversight request covering both the computing facilities and the infrastructure supplying them.[1]
SpaceX’s offering documents describe a high-density data-center cluster extending from Memphis into northern Mississippi. The flagship Colossus campus is on Paul R. Lowry Road in Memphis. Colossus 2 includes facilities on Tulane Road in Memphis and Stateline Road in Southaven, Mississippi.[3]
The letter asks for records rather than announcing a committee subpoena. Pallone’s request could nevertheless support further oversight as lawmakers consider the effects of rapidly expanding AI data centers on power systems, environmental permitting and nearby communities.
Utility and permit records show a divided power system #
At Colossus 1, Memphis Light, Gas and Water reported that the facility was connected to two substations—one pre-existing and one newly constructed—providing a combined 150 megawatts from the MLGW and Tennessee Valley Authority grid. The utility said xAI paid for required upgrades and agreed to curtail its grid consumption when demand is high.[4]
Shelby County issued a construction permit on July 2, 2025, covering 15 permanent Solar SMT-130 gas turbines at the original Memphis site. The permit authorized up to 247 megawatts of generation and imposed emissions-control and operating requirements. Environmental groups appealed, arguing that the county failed to account properly for additional turbines previously used at the campus.[5]
The larger dispute concerns the power operation at 2875 Stanton Road in Southaven. Mississippi’s permit database shows that MZX Tech, an xAI affiliate, received a Prevention of Significant Deterioration construction permit on March 11, 2026. That permit covers a separate configuration of 41 permanent gas-fired turbines.[6][8]
The permanent permit does not cover the trailer-mounted turbine fleet already installed for Colossus 2. Communications reviewed by Reuters showed that xAI had installed 59 turbines for the project without federal clean-air permits, including 57 at the Southaven site. Two other units were installed at an unidentified location, according to the report.[7]
For 30 turbines with available manufacturer data, Reuters estimated potential annual emissions of nearly 2,500 short tons of nitrogen oxides, 4,000 short tons of carbon monoxide and 22 short tons of formaldehyde, assuming continuous operation at 80% capacity. Those are modeled potential emissions, not measurements of pollution actually released.[7]
The permitting question remains in court #
xAI and the Mississippi Department of Environmental Quality maintain that the trailer-mounted equipment is temporary or mobile and does not require an air permit. The NAACP and its Mississippi conference sued xAI and MZX Tech on April 14, alleging that the turbines operate as a stationary power plant subject to federal Clean Air Act permitting requirements.[7][8]
The Justice Department moved in June to intervene and seek dismissal of the case. It argued that restricting the turbines could threaten national-security and economic interests because AI systems supported by the facilities are used in U.S. military operations. The plaintiffs said the intervention would improperly prevent communities from enforcing pollution law through a Clean Air Act citizen suit.[10]
SpaceX did not immediately respond to Reuters’ request for comment on Pallone’s letter. [1] The company’s Memphis website separately says it is addressing misleading claims about Colossus and lists turbine use, emissions, grid effects, water and utility infrastructure among the disputed subjects.
[9]The company has not publicly said whether it will provide the requested records or allow committee staff to tour the sites. The full response—if SpaceX supplies one—will determine whether Pallone’s inquiry produces new operating data or advances toward a more formal committee proceeding.
Companies mentioned #
Further sources #
[[1] Reuters, “US House Democrat asks Musk to answer for polluting xAI data centers,… ↗](https://www.reuters.com/world/us/us-house-democrat-asks-musk-answer-polluting-xai-data-centers-2026-07-29/)
[[2] CNBC, “SpaceX faces House Energy Committee demand to tour its AI data centers i… ↗](https://www.cnbc.com/2026/07/29/spacex-memphis-ai-data-centers-face-house-energy-committee-demands.html)
[3] Space Exploration Technologies Corp., EU prospectus, June 5, 2026. ↗
[[4] Memphis Light, Gas and Water, “2025 xAI Update.” ↗](https://www.mlgw.com/images/content/files/pdf/new/xAI%202025%20Update.pdf)
[[5] TechCrunch, “xAI gets permits for 15 natural gas generators at Memphis data cen… ↗](https://techcrunch.com/2025/07/03/xai-gets-permits-for-15-natural-gas-generators-at-memphis-data-center/)
[6] Mississippi Department of Environmental Quality, MZX Tech facility and permit r… ↗+4 more
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