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Reconsidered EPA Boiler MACT / GACT Rules

This document provides a comprehensive overview of the reconsidered EPA Boiler MACT and GACT rules, highlighting significant changes impacting major sources of air emissions. Key alterations include the introduction of new fuel subcategories, adjustments to particulate matter (PM) and carbon monoxide (CO) emission limits, and updated compliance schedules. Facilities are now required to conduct one-time energy assessments and tune-ups. The compliance deadline varies based on existing permits. This information is crucial for affected facilities to ensure adherence to updated regulations and maintain air quality standards.

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Reconsidered EPA Boiler MACT / GACT Rules

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  1. Reconsidered EPA Boiler MACT / GACT Rules Steve Schliesser Engineer, Planning Section Division of Air Quality Feb 19, 2013 - Outside Involvement Committee Meeting

  2. Reconsidered Boiler MACT for Major Sources –Key Changes and Highlights • 21 Boiler / Fuel subcategories for units > 10 million Btu/hr heat input - New subcategories for light (#1, 2) and heavy (#4 - 6) oils along with wet and dry biomass fuels • Higher PM emission limits for each fuel oil / biomass subcategory • Higher CO emission limits based on new data showing variability. • Lower emission limits for other pollutants / subcategories • Gas fired units subject to annual tune-ups but no emission limits • All affected units subject to one-time energy assessment • Nearly all NC affected facilities covering ~1,000 boilers have 112(j) permits shielding Boiler MACT compliance up to May 20, 2019 • Existing units Boiler MACT compliance date: - with 112(j) permit = May 2019; without it = January 2016

  3. Reconsidered Boiler GACT for Area Sources – Key Changes and Highlights • Initial notification due January 20, 2014 • Initial tune-up and energy assessment compliance date extended 2 years to March 21, 2014 - ISO 50001 energy assessment considered equivalent • Existing dual-fuel units switching from gas to coal, biomass or oil now considered ‘existing’ units  • Tune-ups every 5 years, instead of every 2, for seasonal, limited use, small oil-fired, and boilers with oxygen trim • No PM limits for new boilers with < 0.5% sulfur oil • Higher mercury and CO emission limits for coal boilers • Clearer, broader definition of biomass fuels and energy assessment requirements • Gas fired units not subject to tune-ups or emission limits

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