Overview
- The Justice Department filed to intervene and seek dismissal of the NAACP’s Clean Air Act lawsuit on Monday, arguing that forcing xAI to stop its trailer‑mounted turbines would threaten national, economic and energy security.
- A sworn Department of Defense declaration submitted with the DOJ filing says Grok’s government model supports mission‑critical operations on classified networks and was used in recent strikes, which DOJ says justifies keeping the data center powered.
- Civil rights and environmental groups allege xAI ran unpermitted natural‑gas turbines at its Colossus 2 site near Southaven, Mississippi, and filings and SELC documents show the turbine count rose from 27 to about 57 by mid‑May.
- Mississippi regulators and the state backed xAI, treating the trailer‑mounted units as temporary 'mobile' sources not subject to Clean Air Act permits, a legal position the NAACP and its counsel dispute in court.
- If the court accepts DOJ’s national‑security and enforcement‑discretion arguments it could limit the use of citizen suits to enforce pollution rules and set a precedent for how national security claims affect environmental and environmental‑justice enforcement.