The Sierra Club has submitted formal comments to Louisiana’s environmental agency opposing Meta’s air permit modification for its Hyperion data center facility. The organization contends that the proposed changes to the permit should trigger major-source classification requirements under the Clean Air Act rather than allow the company to maintain its current minor-source designation.
Meta originally obtained a minor-source air permit in July of 2025 to operate 31 diesel emergency generators, a diesel fire pump, and diesel storage tanks at the site. The company now seeks to add 44 fossil-fuel water boilers that would operate continuously and emit pollutants throughout the day and night. Rather than seek a major-source permit to accommodate the increased emissions from both the existing and new equipment, Meta has proposed excluding emissions from the diesel generators during emergency operation hours from its total pollution calculations.
Sierra Club argues this accounting method is improper and that LDEQ has incorrectly excluded emergency operation emissions from its analysis. The organization contends that emergency generators will inevitably be used during operational emergencies, making their emissions a realistic and necessary component of the permit’s overall pollution impact. The group is calling for comprehensive recalculation of total emissions, stricter pollution reporting requirements, enhanced pollution control modeling, and consideration of battery storage alternatives.
The dispute reflects broader concerns about data center expansion nationwide, as many facilities obtain multiple minor-source permits to operate diesel and gas generator fleets while avoiding the more stringent requirements associated with major-source permits. Sierra Club emphasized that the permitting process should include public hearings to ensure affected communities have opportunity for input, and criticized the pace of approval for the project.
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