CFR › Title 40 › Part 63 › §63.998140 CFR §63.9981Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkYou are subject to this subpart if you own or operate a coal-fired EGU or an oil-fired EGU as defined in § 63.10042 of this subpart.