Illinois Administrative Code › Title 35 - ENVIRONMENTAL PROTECTION › Part 204 - PREVENTION OF SIGNIFICANT DETERIORATION › Subpart B - DEFINITIONS › Section 204.620 - Replacement Unit

Current through Register Vol. 48, No. 28, July 12, 2024
"Replacement unit" means an emissions unit for which all the
				  criteria listed in this Section are met. No creditable emission reductions
				  shall be generated from shutting down the existing emissions unit that is
				  replaced.
a) The emissions unit is a
				reconstructed unit, within the meaning of
				40 CFR
				60.15(b)(1), or completely
				takes the place of an existing emissions unit.
b) The emissions unit is identical to or
				functionally equivalent to the replaced emissions unit.
c) The replacement does not alter the basic
				design parameter or parameters of the process unit. Basic design parameters of
				a process unit shall be determined as follows:
1) Except as provided in subsection (c)(3),
				for a process unit at a steam electric generating facility, the owner or
				operator may select as its basic design parameters either maximum hourly heat
				input and maximum hourly fuel consumption rate or maximum hourly electric
				output rate and maximum steam flow rate. When establishing fuel consumption
				specifications in terms of weight or volume, the minimum fuel quality based on
				Btu content shall be used for determining the basic design parameter or
				parameters for a coal-fired electric utility steam generating unit.
2) Except as provided in subsection (c)(3),
				the basic design parameter or parameters for any process unit that is not at a
				steam electric generating facility are maximum rate of fuel or heat input,
				maximum rate of material input, or maximum rate of product output. Combustion
				process units will typically use maximum rate of fuel input. For sources having
				multiple end products and raw materials, the owner or operator should consider
				the primary product or primary raw material when selecting a basic design
				parameter.
3) If the owner or
				operator believes the basic design parameter or parameters in subsections
				(c)(1) and (c)(2) are not appropriate for a specific industry or type of
				process unit, the owner or operator may propose to the Agency an alternative
				basic design parameter or parameters for the source's process unit or units. If
				the Agency approves of the use of an alternative basic design parameter or
				parameters, the Agency shall issue a permit that is legally enforceable,
				records such basic design parameter or parameters and requires the owner or
				operator to comply with such parameter or parameters.
4) The owner or operator shall use credible
				information, such as results of historic maximum capability tests, design
				information from the manufacturer, or engineering calculations, in establishing
				the magnitude of the basic design parameter or parameters specified in
				subsections (c)(2) and (c)(3).
5)
				If design information is not available for a process unit, the owner or
				operator shall determine the process unit's basic design parameter or
				parameters using the maximum value achieved by the process unit in the
				five-year period immediately preceding the planned activity.
6) Efficiency of a process unit is not a
				basic design parameter.