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The EPA says Clean Air Act rules only apply to actual emission units, not non-emitting construction, speeding up projects like data centers and chip plants.
The EPA has clarified that Clean Air Act preconstruction rules apply only to work on actual emission units, not non-emitting infrastructure like foundations or walls, allowing projects such as data centers and semiconductor plants to begin non-emissions-related construction earlier.
This change, effective immediately via a September 2025 letter to TSMC Arizona, resolves long-standing uncertainty and aims to reduce delays and costs.
The agency plans to finalize a rulemaking by late 2026 to formally codify the narrower definition of “begin actual construction,” ensuring consistency and preventing future reversals.
Until then, the EPA will provide case-by-case guidance.
While early construction remains at the developer’s risk—potential permit conditions could require changes or demolition—the update is expected to streamline project timelines without weakening environmental oversight.
La EPA dice que las reglas de la Ley de Aire Limpio solo se aplican a las unidades de emisiones reales, no a la construcción no emisora, acelerando proyectos como centros de datos y plantas de chips.