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Key developments
DOJ joins fight over xAI gas turbines
Insurance Journal reported that the U.S. Department of Justice moved to join litigation defending Elon Musk’s xAI and MZX Tech over gas turbines powering AI operations tied to Grok in the Memphis area. The NAACP lawsuit alleges pollution violations from turbines in Southaven, Mississippi; xAI installed 27 units without an air permit last year and had 57 installed by mid-May, with two more expected. DOJ argues federal non-enforcement decisions made for public and national security interests should prevent citizen suits over the same alleged violations.
Why it matters
The case could set a precedent for AI data centers using temporary or behind-the-meter generation while testing Clean Air Act citizen-enforcement limits.
Sources & driving stories
INSURANCE JOURNAL
Insurance Journal coverageCities advance tougher data center zoning limits
Metro Nashville Planning Commission voted June 25 to recommend a temporary moratorium and zoning ordinance that would prohibit campus-style data centers above 500,000 square feet or 100 MW. Indianapolis planners tightened draft rules for Marion County, increasing protected-district setbacks to 400 feet, lowering property-line noise caps to 55 decibels and requiring annual reports on energy, water, noise and generator testing before a July 1 hearing. Lexington, Kentucky planning staff proposed banning major data centers above 50,000 square feet outright and restricting smaller facilities to warehouse business and light industrial zones, with a public meeting set for July 30.
Why it matters
Local permitting risk is rising as cities move from ad hoc objections to formal limits on size, siting, noise, water and power impacts.
Sources & driving stories
AI loads pressure utilities and turbine supply
Data Center Knowledge reported that utilities and reliability officials are redesigning large-load study and interconnection processes as AI campuses request hundreds of megawatts or more. FirstEnergy has introduced a two-stage load study process, executives cited four- to five-year lead times for transformers and breakers, and FirstEnergy and American Electric Power are pursuing more than 300 miles of new 765-kV transmission in Ohio. CNBC separately reported GE Vernova is ramping its Greenville, South Carolina gas turbine plant, with 200 hires in the past year, 300 more expected by year-end, an order book full through 2029 and about 20% of its gas power order book tied to data center and AI applications.
Why it matters
AI data center growth is turning power availability, interconnection timing and turbine procurement into central constraints on project execution.
Sources & driving stories
DATA CENTER KNOWLEDGE
Data Center Knowledge coverageCNBC
CNBC coverageWorth noting
WORTH NOTING
Ohio towns pursue data center bans
Residents in Sunbury and Pataskala are collecting signatures for charter amendments that would prohibit data centers above 25 MW, alongside a broader Conserve Ohio state amendment effort now aimed at the 2027 primary ballot.
WORTH NOTING
Oakland University advances campus review
The university’s board voted to move a Fairmount Properties data center and AI institute proposal into due diligence, including environmental, financial and infrastructure studies, despite student and faculty concerns.
WORTH NOTING
California water bills draw warnings
Capitol Weekly published commentary urging stronger state technical assistance and coordinated water-use data under AB2619 and AB2469, citing an Imperial hyperscale project described as requiring 750,000 gallons per day.
Still unclear
OPEN QUESTION
Will courts limit Clean Air Act citizen suits?
DOJ’s xAI argument could determine whether federal non-enforcement choices tied to public or national security interests can block community lawsuits over data center power emissions.
OPEN QUESTION
Can zoning rules catch queued projects?
Several local proposals target future data centers, but projects already in zoning or permitting pipelines may be exempt, limiting the near-term effect of new restrictions.