Federal Register #EPA-R07-OAR-2026-4819

EPA Proposed Approval of Missouri Air Plan Revisions for NOx Emissions Control from Large Stationary Internal Combustion Engines

This opportunity involves the Environmental Protection Agency (EPA) proposing approval of Missouri's updated air quality regulations for controlling Nitrogen Oxide (NOx) emissions from large stationary internal combustion engines. - Government Buyer: - Environmental Protection Agency (EPA) - Missouri Department of Natural Resources (regulatory submitter) - No OEMs or commercial vendors are mentioned, as this is a regulatory action, not a procurement. - Products/Services Requested: - No products or services are being procured; the action concerns regulatory revisions and compliance requirements for NOx emissions. - Notable Requirements: - Updates to Missouri's State Implementation Plan (SIP) for NOx emissions control - Revised reporting, recordkeeping, and compliance requirements for large stationary internal combustion engines - New exemption for certain spark-ignited engines emitting less than 25 tons of NOx during the ozone season - Alignment with Clean Air Act (CAA) and NOx SIP Call budget obligations - Source-specific SIP revision for Castleton Energy Center in New York, addressing NOx RACT for a combined-cycle combustion turbine generator - No contract value, product line items, or service line items are associated with this notice, as it is not a procurement opportunity.

Description

The Environmental Protection Agency (EPA) is proposing to approve revisions to the Missouri State Implementation Plan (SIP) related to Control of Nitrogen Oxide (NOx) Emissions From Large Stationary Internal Combustion Engines. The revisions reformat and revise reporting, recordkeeping, and compliance requirements; incorporate other state rules by reference; add definitions specific to the rule; revise unnecessarily restrictive or duplicative language; and make administrative wording changes. The revisions also add an exemption for certain spark-ignited internal combustion engines. The EPA's proposed approval is pursuant to, and consistent with, the requirements of the Clean Air Act (CAA).

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