§97.7. Computation of time. — Inbound Citations

(1) Notwithstanding paragraph (a) of this section, a unit under paragraph (a)(1) or (a)(2) of this section that has a federally enforceable permit that restricts the unit to combusting only natural gas or fuel oil (as defined in § 75.2 of this chapter) during a control period includes a NOX emission limitation restricting NOX emissions during a control period to 25 tons or less, and includes the special provisions in paragraph (b)(4) of this section shall be exempt from the requirements of the NOX Budget Trading Program, except for the provisions of this paragraph (b), § 97.2, § 97.3, § 97.4(a), § 97.7, and subparts E, F, and G of this part. The NOX emission limitation under this paragraph (b)(1) shall restrict NOX emissions during the control period by limiting unit operating hours. The restriction on unit operating hours shall be calculated by dividing 25 tons by the unit's maximum potential hourly NOX mass emissions, which shall equal the unit's maximum rated hourly heat input multiplied by the highest default NOX emission rate otherwise applicable to the unit under § 75.19 of this chapter.

(1) Any NOX Budget unit, other than a NOX Budget opt-in unit, that is permanently retired shall be exempt from the NOX Budget Trading Program, except for the provisions of this section, § 97.2, § 97.3, § 97.4, § 97.7, and subparts E, F, and G of this part.