§97.204. Applicability. — Inbound Citations

(i) For a unit that is a CAIR SO2 unit under § 97.204 on the later of November 15, 1990 or the date the unit commences commercial operation as defined in paragraph (1) of this definition and that subsequently undergoes a physical change (other than replacement of the unit by a unit at the same source), such date shall remain the date of commencement of commercial operation of the unit, which shall continue to be treated as the same unit.

(1) Any CAIR SO2 unit that is permanently retired and is not a CAIR SO2 opt-in unit under subpart III of this part shall be exempt from the CAIR SO2 Trading Program, except for the provisions of this section, §§ 97.202, 97.203, 97.204, 97.206(c)(4) through (7), 97.207, 97.208, and subparts BBB, FFF, and GGG of this part.

(b) Is not a CAIR SO2 unit under § 97.204 and is not covered by a retired unit exemption under § 97.205 that is in effect;

(a) Except as otherwise provided in §§ 97.201 through 97.204, §§ 97.206 through 97.208, and subparts BBB and CCC and subparts FFF through HHH of this part, a CAIR SO2 opt-in unit shall be treated as a CAIR SO2 unit for purposes of applying such sections and subparts of this part.

(i) Is not a CAIR SO2 unit under § 97.204 and is not covered by a retired unit exemption under § 97.205 that is in effect;

(a) If a CAIR SO2 opt-in unit becomes a CAIR SO2 unit under § 97.204, then the CAIR designated representative shall notify in writing the permitting authority and the Administrator of such change in the CAIR SO2 opt-in unit's regulatory status, within 30 days of such change.