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xAI built its Colossus AI supercomputer cluster in Memphis and powered it using gas turbines in Southaven, Mississippi, most operated without required Clean Air Act permits. [1][8] The NAACP filed a federal Clean Air Act lawsuit in April 2026; the DOJ moved to dismiss it in late June, treating AI compute infrastructure as a federal interest and forcing the NAACP to litigate against both xAI and the federal government. [9][16] SemiAnalysis now reports xAI is building 'Colossus 2,' described as the world's first gigawatt-scale datacenter, suggesting the build-first approach is extending to an even larger second facility. [12]

The DOJ's intervention substantially raises the burden for community plaintiffs enforcing the Clean Air Act against AI infrastructure. If Colossus 2 proceeds under the same approach, the permitting disputes around Colossus 1 become a preview of disputes at gigawatt scale, with federal backing already established as precedent.

xAI's Colossus AI supercomputer cluster at 3231 Riverport Rd in Memphis depends on gas turbines in Southaven, Mississippi for much of its power. The company began operating those turbines without the required Clean Air Act permits — a move the Southern Environmental Law Center characterized as building an illegal power plant. [1] In March 2026, Mississippi's permit board retroactively authorized 41 of the turbines despite documented air quality concerns. [2][3] xAI did not pause expansion pending that decision and subsequently added more turbines; Earthjustice and social media commentary characterize 57 turbines as unpermitted at the time of the DOJ filing. [4][5][6]

The NAACP filed a federal Clean Air Act lawsuit in April 2026 alleging unlawful turbine operation and disproportionate health harm to majority-Black communities near the Memphis facility. [7][8] In late June 2026, the DOJ moved to dismiss the suit, intervening on xAI's behalf and treating the facility's power needs as a federal interest worth defending. [9][10] The NAACP is now litigating against both xAI and the federal government. Critics have drawn an explicit connection between the DOJ's posture and Musk's reported $250 million in contributions to elect Trump and Republicans in 2024, though no official record establishes a direct causal link. [11]

SemiAnalysis reports xAI is now building 'Colossus 2,' described as the world's first gigawatt-scale datacenter. [12] SemiAnalysis had earlier framed xAI's approach as deliberate regulatory arbitrage — the calculated bet that demand for AI compute is too politically valuable for any regulator to actually force a shutdown — and the DOJ's decision to intervene against citizen plaintiffs enforcing the Clean Air Act lends concrete support to that thesis. [13] A planned gigawatt-scale second facility would represent a significant scaling of the same operational posture.

Community reaction has extended beyond the specific permitting fight. Residents near xAI's Memphis facilities are expressing anger at the SpaceX IPO, linking frustration with Musk-affiliated ventures more broadly. [14] Nashville is examining data center regulations directly in response to the Memphis situation. [15] Earthjustice has publicly characterized the Southaven operation as an illegal gas power plant, adding a third major environmental law organization — alongside the Southern Environmental Law Center and the Environmental Integrity Project — to the coalition on record opposing xAI's approach. [6]