Document NRoL90me8kkMB22LMOqzzRbp

Luminant Generation Company LLC Luminant Generation Company LLC. Martin Lake Steam Electric Station 6555 Sierra Drive Irving, TX 75039 March 31, 2025 Submitted via email to airaction(depa.gov President Donald J. Trump do Administrator Lee M. Zeldin Office of the Administrator (1101A) U.S. Environmental Protection Agency 1200 Pennsylvania Avenue, I.W. Washington, D.C. 20460 Re: Presidential Exemption: National Emission Standardsfin. Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units Review of the Residual Risk and Technology Review, 89 Fed. Reg. 38,508 (May 7, 2024): Martin Lake Steam Electric Station Units 1, 2, and 3. Dear President Trump: Please accept this letter on behalf of. Luminant Generation Company LLC ("Luminant") requesting a Presidential exemption under Section 1 12(i)(4) of the Clean Air Act ("CAA") from compliance with the filterable particulate matter ("fPM") surrogate emission standard for nonmercury metal hazardous air pollutants ("HAP") and the requirement to install continuous emissions monitoring systems ("CEMS" or "PM CEMS") under the above-referenced rule (the "MATS RTR" or the "Rule") for the Martin Lake Steam Electric Station ("Martin Lake"). Luminant is requesting a two-year exemption, beginning July 6, 2027, from these requirements for Martin Lake Units 1, 2, and 3. The MATS RTR amended 40 C.F.R. Part 63 Subpart UUUUU and became effective on July 8, 2024. Under the Rule, Martin Lake is requireci to reduce fi'M emissions from 0.030 lh/MMBtu to 0.010 lb/MMI3tu. Compliance with this revised limit is based on a continuous, 30day rolling limit. In addition, the Rule requires all coal-fired EGUs to use CEMS to implement the revised f-PM standard, which may not be technically feasible at the lower fi'M standard. The compliance deadline for meeting the revised f-PM standard and for using PM CEMS is July 6, 2027, but work to design, purchase, install, and/or test any necessary controls or changes in operating procedures or maintenance practices, and implement requireci adjustments to the CEMS would need to begin much sooner. Under Section 1 12(i)(4) of the Clean Air Act, the President may issue exemptions - from compliance with any standard or limitation under this section for a period of not more than 2 years if the President determines that the technology to implement such standard is not available and 1 Sierra Club FOIA 2025-EPA-04883 ED_018388_00000157-00001 SC_EVERSPLIT0005920