f EPA is not finalizing GHG emission guidelines for existing combustion turbines but will do so at a later date. Note that, for these purposes, a turbine is considered “existing” under Subpart TTTT if it was constructed after 1/8/2014 or reconstructed after 6/18/2014 but before 5/23/2023. Relocation of a turbine, and most repairs and refurbishments do not cause loss of “existing” status. This may cause a rush of projects to recommission or repurpose existing turbines before the next rule is developed. f For new, modified and reconstructed steam EGUs the following standards would apply: • Large modifications (increases in hourly emission rate by more than 10%) of coal-fired EGUs will have the same emission standards as for existing coal-fired steam EGUs. • For oil or gas-fired steam EGUs, EPA is not proposing any revisions of the 2015 standard for large modifications. • EPA is not revising the 2015 NSPS for newly constructed or reconstructed fossil fuel-fired steam EGUs • EPA is withdrawing the 2018 proposed amendments to the NSPS for GHG emissions for coal-fired EGUs.
Effluent Limitation Guidelines and Standards for Steam Electric Power Generating Point Sources
EPA finalized a revision to the effluent limitations guidelines and standards (ELG) for steam generating point sources that utilize flue gas desulfurization (for SO2/PM control), has bottom ash transport water and legacy wastewater at existing sources, and combustion residual leachate at new and existing sources. This regulatory update is expected to reduce pollutant discharges by approximately 660 to 672 million pounds per year. Through this rulemaking, EPA modified the effluent limitations for both new and existing sources for several categories of wastewater discharges. The rule establishes zero discharge limitations for all pollutants for the following categories: f Flue gas desulfurization (FGD) wastewater: wastewater generated specifically from the wet flue gas desulfurization scrubber system that encounters the flue gas or FGD solids. Note that the rulemaking also removes the alternative standards for facilities designated as high-flow or low-utilization. f Bottom Ash Transport Water (BATW): water used to convey ash from the ash collection and storage equipment and has direct contact with bottom ash. This definition does not include low volume/short duration discharges from minor leaks or maintenance vents. f Combustion Residual Leachate (CRL): leachate from landfills or surface impoundments containing combustion residuals.
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