Section 217.390  Emissions Averaging Plans

a)         An owner or operator of certain affected units may comply through an emissions averaging plan. 

1)         The unit or units that commenced operation before January 1, 2002 may be included in an emissions averaging plan as follows:  units located at a single source or at multiple sources in Illinois, so long as the units are owned by the same company or parent company where the parent company has working control through stock ownership of its subsidiary corporations.  A unit may be listed in only one emissions averaging plan.

2)         The following types of units may not be included in an emissions averaging plan:  units that commence operation after January 1, 2002, unless the unit replaces an engine or turbine that commenced operation on or before January 1, 2002, or it replaces an engine or turbine that replaced a unit that commenced operation on or before January 1, 2002.  The new unit must be used for the same purpose as the replacement unit.  The owner or operator of a unit that is shut down and replaced must comply with the provisions of Section 217.396(d)(3) before the replacement unit may be included in an emissions averaging plan.

b)         An owner or operator must submit an emissions averaging plan to the Agency by the applicable compliance date set forth in Section 217.392.  The plan must include, but is not limited to:

1)         The list of affected units included in the plan by unit identification number and permit number.

2)         A sample calculation demonstrating compliance using the methodology provided in subsection (f) of this Section for both the ozone season and calendar year.

c)         An owner or operator may amend an emissions averaging plan only once per calendar year.  An amended plan must be submitted to the Agency by May 1 of the applicable calendar year.  If an amended plan is not received by the Agency by May 1 of the applicable calendar year, the previous year's plan will be the applicable emissions averaging plan.

d)         Notwithstanding subsection (c) of this Section, an owner or operator, and the buyer, if applicable, must submit an updated emissions averaging plan or plans to the Agency within 60 days if a unit that is listed in an emissions averaging plan is sold or taken out of service.

e)         An owner or operator must:

1)         Demonstrate compliance for both the ozone season (May 1 through September 30) and the calendar year (January 1 through December 31) by using the methodology and the units listed in the most recent emissions averaging plan submitted to the Agency pursuant to subsection (b) of this Section; the higher of the monitoring or test data determined pursuant to Section 217.394; and the actual hours of operation for the applicable control period; 

2)         Notify the Agency by October 31 following the ozone season, if compliance cannot be demonstrated for that ozone season; and 

3)         Submit to the Agency, by January 31 following each calendar year, a compliance report containing the information required by Section 217.396(c)(4).

f)          The total mass of actual NO_x emissions from the units listed in the emissions averaging plan must be equal to or less than the total mass of allowable NO_x emissions for those units for both the ozone season and calendar year.  The following equation must be used to determine compliance:

Where:

g)         For each unit in the averaging plan, and each fuel used by a unit, determine actual and allowable NO_x emissions using the following equations, except as provided for in subsection (h) of this Section:

1)         Actual emissions must be determined as follows:

2)         Allowable emissions must be determined as follows:

Where:

3)         For a replacement unit that is electric-powered, the allowable NO_x emissions from the affected unit that was replaced should be used in the averaging calculations and the actual NO_x emissions for the electric-powered replacement unit (EM_{act elec(i)}) are zero.  Allowable NO_x emissions for the electric-powered replacement are calculated using the actual total bhp-hrs generated by the electric-powered replacement unit on an ozone season and on an annual basis multiplied by the allowable NO_x emission rate in lb/bhp-hr of the replaced unit. The allowable mass of NO_x emissions from an electric-powered replacement unit (EM_{all elec(i)}) must be determined by multiplying the nameplate capacity of the unit by the hours operated during the ozone season or annually and the allowable NO_x emission rate of the replaced unit (E_{all rep}) in lb/mmBtu converted to lb/bhp-hr.  For this calculation the following equation should be used:

Where:

4)         For a replacement unit that is not electric, the allowable NO_x emissions rate used in the equations set forth in subsection (g)(2) of this Section must be the higher of the actual NO_x emissions as determined by testing or monitoring data or the applicable uncontrolled NO_x emissions factor from Compilation of Air Pollutant Emission Factors:  AP-42, Volume I:  Stationary Point and Area Sources, as incorporated by reference in Section 217.104 for the unit that was replaced.

5)         For a unit that is replaced with purchased power, the allowable NO_x emissions rate used in the equations set forth in subsection (g)(2) of this Section must be the emissions concentration set forth in Section 217.388(a) or subsection (g)(6) of this Section, when applicable, for the type of unit that was replaced.  For owners or operators replacing units with purchased power, the annual hours of operations that must be used are the calendar year hours of operation for the unit that was shut down, averaged over the three-year period prior to the shutdown.  The actual NO_x emissions for the units replaced by purchased power (EM_(i)act) are zero.  These units may be included in any emissions averaging plan for no more than five years beginning with the calendar year that the replaced unit is shut down.

6)         For non-Appendix G units used in an emissions averaging plan, allowable emissions rate used in the equations set forth in subsection (g)(2) of this Section must be the higher of the actual NO_x emissions as determined by testing or monitoring data or the applicable uncontrolled NO_x emissions factor from Compilation of Air Pollutant Emission Factors:  AP-42, Volume I:  Stationary Point and Areas Sources, as incorporated by reference in Section 217.104.

h)         For units that use CEMS, the data must show that the total mass of actual NO_x emissions determined pursuant to subsection (h)(1) of this Section is less than or equal to the allowable NO_x emissions calculated in accordance with the equations in subsections (f) and (h)(2) of this Section for both the ozone season and calendar year.  The equations in subsection (g) of this Section will not apply.

1)         The total mass of actual NO_x emissions in lbs for a unit (EM_act) must be the sum of the total mass of actual NO_x emissions from each affected unit using CEMS data collected in accordance with 40 CFR 60 or 75, or alternate methodology that has been approved by the Agency or USEPA and included in a federally enforceable permit.

2)         The allowable NO_x emissions must be determined as follows:

Where:

(Source:  Added at 31 Ill. Reg. 14271, effective September 25, 2007)