Federal Register #2026-11432

EPA Finalizes Revised NOX Emission Limits for U.S. Steel's Keetac Facility

The U.S. Environmental Protection Agency (EPA) has finalized new nitrogen oxide (NOX) emission limits for the Keetac taconite facility's Grate Kiln indurating furnace, operated by United States Steel Corporation (U.S. Steel), in Keewatin, Minnesota. - Government Buyer: - Environmental Protection Agency (EPA), Region 5, Air and Radiation Division - OEM Highlight: - United States Steel Corporation (U.S. Steel) is the facility operator and subject of the rule - Products/Requirements: - Revised NOX emission limits for the Keetac Grate Kiln indurating furnace: - 3.4 lbs NOX/MMBtu (rolling 720-hour average) when firing exclusively natural gas - 2.0 lbs NOX/MMBtu (rolling 720-hour average) when firing any other fuel or combination of fuels - Possible adjustment of the 2.0 lbs limit up to 2.5 lbs NOX/MMBtu based on post-installation emissions data and EPA approval - Compliance requires installation of NOX reduction technology and continuous emissions monitoring - Facility must collect and report emissions data for up to 5,100 hours after technology installation - Unique/Notable Requirements: - Emission limits are enforceable after installation of NOX reduction technology - Data-driven adjustment of emission limits is possible within a defined period - Rule is part of Clean Air Act Best Available Retrofit Technology (BART) requirements to reduce visibility impairment in protected areas - No procurement of products or services is solicited; this is a regulatory action affecting U.S. Steel's operations

Description

The U.S. Environmental Protection Agency (EPA) is revising the Original 2013 Federal Implementation Plan (FIP) by finalizing nitrogen oxide (NOX) emission limits for the indurating furnace at United States Steel's Keetac taconite facility in Keewatin, Minnesota to satisfy the best available retrofit technology (BART) requirement. The EPA is setting NOX BART emission limits with compliance determined on a rolling 720-hour average: 3.4 lbs NOX/MMBtu when firing exclusively natural gas, enforceable three years after the final rule, and 2.0 lbs NOX/MMBtu when firing other fuels, enforceable five years after the final rule unless modified earlier. The rule allows Keetac to seek an adjustment of the cofiring emission limit within 52 months from the effective date, not to exceed 2.5 lbs NOX/MMBtu based on CEMS data after NOX reduction technology installation.

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