On August 9, 2019, the EPA plans to publish a proposed rule to codify the current interpretation of New Source Review (NSR) Project Emissions Accounting. The rule would explicitly allow consideration of emissions decreases from a project, alongside any emissions increases, when determining whether the project causes a significant emissions increase from the source. Historically, many state regulators, and even certain EPA applicability determinations, have suggested that only emissions increases (and not decreases) should be considered. Considering emissions decreases in this analysis allows more projects to avoid triggering NSR.

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