Document 3Joxk9DDxZ8p201eXMb8YZQ93

Sierra Club FOIA 2025-EPA-04883 ) Startup Requirements MATS had two options for defining startup: Definition #1: startup ends when steam is used for generation or any on-site purpose requires use of clean fuels for ignition and control device use when coal/oil combustion begins (except for dry scrubber or selective catalytic reduction units, which come online as conditions allow) Definition #2: startup ends 4 hours after the start of generation of electricity or useful thermal energy operators must provide records of clean and non-clean fuel use, load characteristics, as well as exhaust flow and PM control device parameters Final Rule: Removes startup definition #2 80000-SZ00000- 8881.0- oe SC_EVERSPLIT0006304