Compliance and excess emissions.

Excess emissions of nitrogen oxides under § 77.6 of this chapter shall be calculated as follows: (a) For a unit that is not in an approved averaging plan: (1) Calculate EE i for each portion of the calendar year that the unit is subject to a different NO X emission limitation: where: EE i = Excess emissions for NO X for the portion of the calendar year (in tons); R ai = Actual average emission rate for the unit (in lb/mmBtu), determined according to part 75 of this chapter for the portion of the calendar year for which the applicable emission limitation R l is in effect; R li = Applicable emission limitation for the unit, (in lb/mmBtu), as specified in § 76.5, 76.6, or 76.7 or as determined under § 76.10; HI i = Actual heat input for the unit, (in mmBtu), determined according to part 75 of this chapter for the portion of the calendar year for which the applicable emission limitation, R l , is in effect. (2) If EE i is a negative number for any portion of the calendar year, the EE value for that portion of the calendar year shall be equal to zero (e.g., if EE i = −100, then EE i = 0). (3) Sum all EE i values for the calendar year: where: EE = Excess emissions for NO X for the year (in tons); n = The number of time periods during which a unit is subject to different emission limitations; and (b) For units participating in an approved averaging plan, when all the requirements under § 76.11(d)(1) are not met, where: EE = Excess emissions for NO X for the year (in tons); R ai = Actual annual average emission rate for NO X for unit i, (in lb/mmBtu), determined according to part 75 of this chapter; R li = Applicable emission limitation for unit i, (in lb/mmBtu), as specified in § 76.5, 76.6, or 76.7; HI i = Actual annual heat input for unit i, mmBtu, determined according to part 75 of this chapter; n = Number of units in the averaging plan.