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EPA Reconsiders EGU MACT for Mercury, PM

Posted Thursday, December 6th, 2012

On November 30, 2012, EPA published proposed revisions to the Mercury and Air Toxics Standard (MATS) for new electric utility steam generating units, also known as the electric utility steam generating unit maximum achievable control technology (EGU MACT).  77 Fed. Reg. 71323.  As previously reported in the July 25, 2012, HGS Environmental Update, EPA announced the reconsideration to address compliance monitoring constraints for mercury new source emission standards and to address additional data for particulate matter (PM) and hydrogen chloride new source emission standards. 

Notable proposed revisions include easing mercury emission limits for certain new coal-fired EGUs and easing filterable PM and hydrogen chloride emission limits for new coal-fired EGUs.  The proposal also eases sulfur dioxide, lead, and selenium emission limits for new coal-fired EGUs.  In addition, EPA proposes to add synthetic natural gas, syngas, propane, and ultra-low sulfur diesel to the list of approved clean fuels for use during startup and shutdown.  Proposed revisions to the definitions of “startup” and “shutdown” clarify how the terms apply to EGUs producing electricity for on-site use and to cogeneration units producing useful thermal energy.  The proposed definitions also define the starting and ending of startup and shutdown periods by the type of fuel fired in certain circumstances.  EPA anticipates no significant change in costs, emissions reductions, or health benefits from the proposed changes.  EPA is accepting comments on the proposal until December 31, 2012.  Also, if requested by December 10, 2012, a public hearing will be held on the proposal on December 18, 2012.

Please contact Jon Harris Maurer for additional information.

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