HIj is the heat input for fuel type j for the averaging period

n is the number of fuels fired during the averaging period

NR 428.25(1)(b)3.d. d. The annual and ozone season actual NOx mass emissions and heat input in aggregate for all emissions units.

NR 428.25(1)(b)3.e. e. The annual and ozone season actual aggregate NOx emission rate for all emissions units. This emission rate is the summation of the total mass of NOx emissions for all emissions units divided by the total heat input for all emissions units and is calculated as follows:

  Equation 8

where:

ERaggr is the emission rate in aggregate for all emissions units on an annual or ozone season basis

NOx Massu is the total NOx mass emissions for emissions unit u, for the averaging period

HIu is the total heat input for each emissions unit u, for the averaging period

n is the number of emissions units participating in averaging

NR 428.25(1)(b)3.f. f. The annual and ozone season aggregate emission limitation for all emissions units. These emission limitations are the summation of the product of each unit’s actual heat input and emission limitation by fuel type divided by the summation of the actual heat input for all emissions units. The aggregate emission limitations shall be calculated as follows:

  Equation 9

where:

ELaggr is the aggregate emission limit for all emissions units on an annual or ozone season basis

HIf is the heat input for fuel f, for unit u

ELf is the emission limit for fuel f, for unit u

HIu is the total heat input for emissions unit u, for the averaging period

n is the number of emissions units participating in averaging

j is the number of fuels for unit u

NR 428.25(1)(b)3.g. g. Compliance on an annual and ozone season basis is demonstrated if the aggregate emission rate required in subd. 3. e. is less than the aggregate emission limit required in subd. 3. f., and the NOx mass emissions required in subd. 3. b. is less than the mass emissions cap required in subd. 1. f.

NR 428.25(1)(b)4. 4. ‘Heat input conversion.’ For an emissions unit subject to emission limitations expressed in units other than heat input, the emission limitation shall be converted to a heat input basis. All required calculations shall be on a common basis with necessary conversions performed according to the methods in 40 CFR part 60, Appendices A and B, incorporated by reference in s. NR 484.04 (13) and (21).

NR 428.25(1)(b)5. 5. ‘Mass emissions cap exceedance.’ If the total NOx emissions from the emissions units in the averaging program exceed either the annual or ozone season emissions caps determined in subd. 1. f., the owner or operator shall achieve additional NOx reductions to compensate for the excess emissions within 3 calendar years after the averaging year with the exceedance.

NR 428.25(1)(c) (c) Multi-facility average. An owner or operator may average emissions from emissions units at multiple facilities by complying with the following procedures for demonstrating compliance on an annual and ozone season basis with an aggregate NOx emission limitation:

NR 428.25(1)(c)1. 1. ‘Notification.’ The owner or operator shall submit to the department a notification of an NOx emissions averaging program by October 1 of the year prior to the emissions averaging year. The notification shall include the following information:

NR 428.25(1)(c)1.a. a. The participating emissions units.

NR 428.25(1)(c)1.b. b. The owner or operator of each emissions unit.

NR 428.25(1)(c)1.c. c. The applicable emission limitation in s. NR 428.22 for each emissions unit.

NR 428.25(1)(c)1.d. d. The projected heat input, capacity utilization, NOx emission rate and total NOx mass emissions for each emissions unit on an annual and ozone season basis.

NR 428.25(1)(c)1.e. e. The projected heat input, capacity utilization, NOx emission rate and total NOx mass emissions in aggregate for all emissions units participating in the averaging program.