# 97.187 Change in regulatory status.
(a) *Notification.* If a CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104, then the CAIR designated representative shall notify in writing the permitting authority and the Administrator of such change in the CAIR NO<sub>X</sub> opt-in unit's regulatory status, within 30 days of such change.
(b) *Permitting authority's and Administrator's actions.* (1) If a CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104, the permitting authority will revise the CAIR NO<sub>X</sub> opt-in unit's CAIR opt-in permit to meet the requirements of a CAIR permit under § 97.123, and remove the CAIR opt-in permit provisions, as of the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104.
(2)(i) The Administrator will deduct from the compliance account of the source that includes the CAIR NO<sub>X</sub> opt-in unit that becomes a CAIR NO<sub>X</sub> unit under § 97.104, CAIR NO<sub>X</sub> allowances equal in amount to and allocated for the same or a prior control period as:
(A) Any CAIR NO<sub>X</sub> allowances allocated to the CAIR NO<sub>X</sub> opt-in unit under § 97.188 for any control period after the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104; and
(B) If the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104 is not December 31, the CAIR NO<sub>X</sub> allowances allocated to the CAIR NO<sub>X</sub> opt-in unit under § 97.188 for the control period that includes the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104, multiplied by the ratio of the number of days, in the control period, starting with the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104 divided by the total number of days in the control period and rounded to the nearest whole allowance as appropriate.
(ii) The CAIR designated representative shall ensure that the compliance account of the source that includes the CAIR NO<sub>X</sub> opt-in unit that becomes a CAIR NO<sub>X</sub> unit under § 97.104 contains the CAIR NO<sub>X</sub> allowances necessary for completion of the deduction under paragraph (b)(2)(i) of this section.
(3)(i) For every control period after the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104, the CAIR NO<sub>X</sub> opt-in unit will be allocated CAIR NO<sub>X</sub> allowances under § 97.142.
(ii) If the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104 is not December 31, the following amount of CAIR NO<sub>X</sub> allowances will be allocated to the CAIR NO<sub>X</sub> opt-in unit (as a CAIR NO<sub>X</sub> unit) under (97.142 for the control period that includes the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104:
(A) The amount of CAIR NO<sub>X</sub> allowances otherwise allocated to the CAIR NO<sub>X</sub> opt-in unit (as a CAIR NO<sub>X</sub> unit) under § 97.142 for the control period multiplied by;
(B) The ratio of the number of days, in the control period, starting with the date on which the CAIR NO<sub>X</sub> opt-in unit becomes a CAIR NO<sub>X</sub> unit under § 97.104, divided by the total number of days in the control period; and
(C) Rounded to the nearest whole allowance as appropriate.
[65 FR 2727, Jan. 18, 2000, as amended at 71 FR 74795, Dec. 13, 2006]