Section 336.2501. Definitions.

Rule 1501. The following definitions apply to terms used in this part:

(a)   "Affected EGU" means any stationary coal-fired electric generating unit serving at any time, since the start-up of a unit's combustion chamber, a generator with nameplate capacity of more than 25 megawatts producing electricity for sale.

(b)     "Automated data acquisition and handling system" or "DAHS" means that component of the continuous emission monitoring system (CEMS), or other emissions monitoring system approved for use by the department, designed to interpret and convert individual output signals from pollutant concentration monitors, flow monitors, diluent gas monitors, and other component parts of the monitoring system to produce a continuous record of the measured parameters in the measurement units for mercury.

(c)     "Boiler" means an enclosed fossil fuel-fired or other fuel-fired combustion device used to produce heat and to transfer heat to recirculating water, steam, or other medium.

(d)    "Bottom-cycling cogeneration unit" means a cogeneration unit in which the energy input to the unit is first used to produce useful thermal energy and at least some of the reject heat from the useful thermal energy application or process is then used for electricity production.

(e)   "Coal" means any solid fuel classified as anthracite, bituminous, subbituminous, or lignite by the ASTM standard specification for classification of coals by rank D388- 77, 90, 91, 95, 98a, or 99.

(f)   "Coal-derived fuel" means any fuel (whether in a solid, liquid, or gaseous state) produced by the mechanical, thermal, or chemical processing of coal.

(g)   "Coal-fired" means combusting any amount of coal or coal-derived fuel, alone or in combination with any amount of any other fuel, during any year.

(h)   "Coal-fired electric utility steam generating unit" means an electric utility steam generating unit that burns coal, coal refuse, or a synthetic gas derived from coal either exclusively, in any combination together, or in any combination with other fuels in any amount.

(i)   "Cogeneration unit" means a stationary, fossil fuel-fired boiler doing both of the following:

(i)     Having equipment used to produce electricity and useful thermal energy for industrial, commercial, heating, or cooling purposes through the sequential use of energy.

(ii)   Producing the following during the 12-month period starting on the date the unit first produces electricity and during any calendar year after the calendar year in which the unit first produces electricity:

(A)  For a topping-cycle cogeneration unit, both of the following apply:

(1)   Useful thermal energy not less than 5% of total energy output.

(2)   Useful power that, when added to 1/2 of useful thermal energy produced, is not less then 42.5% of total energy input from fossil fuel, if useful thermal energy produced is 15% or more of total energy output, or not less than 45% of total energy input from fossil fuel, if useful thermal energy produced is less than 15% of total energy output.

(B)   For a bottoming-cycle cogeneration unit, useful power not less than 45% of total energy input from fossil fuel.

(iii)    Provided that the total energy input under paragraphs (ii)(A)(2) and (B) of this rule shall equal the unit's total energy input from all fuel except biomass if the unit is a boiler.

(j)   "Combustion turbine" means both of the following:

(i)   An enclosed device comprising a compressor, a combustion, and a turbine and in which the flue gas resulting from the combustion of fuel in the combustion passes through the turbine, rotating the turbine.

(ii)    If the enclosed device under paragraph (i) of this rule is combined cycle, any associated heat recovery steam generator and steam turbine.

(k)     "Commence operation" means to have begun any mechanical, chemical, or electronic process, including, with regard to a unit, start-up of a unit's combustion chamber.

(l)    "Common stack" means a single flue through which emissions from 2 or more units are exhausted.

(m)   "Compliance year" means the 12-month rolling time period for which a mercury emission limitation under this part is in effect.

(n)    "Continuous emission monitoring system" or "CEMS" means the equipment required to sample, analyze, measure, and provide, by means of readings recorded at least once every 15 minutes, using an automated data acquisition and handling system (DAHS), a permanent record of mercury emissions, stack gas volumetric flow rate, stack gas moisture content, and oxygen or carbon dioxide concentration, as applicable. The following systems are the principal types of CEMS:

(i)     A flow monitoring system, consisting of a stack flow rate monitor and an automated data acquisition and handling system and providing a permanent, continuous record of stack gas volumetric flow rate, in units of standard cubic feet per hour (scfh).

(ii)    A mercury concentration monitoring system, consisting of a mercury pollutant concentration monitor and an automated data acquisition and handling system and providing a permanent, continuous record of mercury emissions in units of micrograms per dry standard cubic meter (µg/dscm).

(iii)   A moisture monitoring system, as defined in 40 C.F.R. §75.11(b)(2), adopted by reference in R 336.1802a, and providing a permanent, continuous record of the stack gas moisture content, in percent water.

(iv)       A carbon dioxide monitoring system, consisting of a carbon dioxide concentration monitor (or an oxygen monitor plus suitable mathematical equations from which the carbon dioxide concentration is derived) and an automated data acquisition and

handling  system  and    providing  a  permanent,   continuous  record  of  carbon  dioxide emissions, in percent carbon dioxide.

(v)    An oxygen monitoring system, consisting of an oxygen concentration monitor and an automated data acquisition and handling system and providing a permanent, continuous record of oxygen, in percent oxygen.

(o)   "Electric generating unit" or "EGU" means the following:

(i)   Except as provided in paragraph (ii) of this subdivision, a stationary, fossil fuel- fired boiler or stationary, fossil fuel-fired combustion turbine serving at any time, since the start-up of the unit's combustion chamber, a generator with nameplate capacity of more than 25 megawatts producing electricity for sale.

(ii)     For a unit that qualifies as a cogeneration unit during the 12-month period starting on the date the unit first produces electricity and continues to qualify as a cogeneration unit, a cogeneration unit serving at any time a generator with nameplate capacity of more than 25 megawatts and supplying in any calendar year more than 1/3 of the unit's potential electric output capacity or 219,000 megawatt-hour, whichever is greater, to any utility power distribution system for sale. If a unit qualifies as a cogeneration unit during the 12-month period starting on the date the unit first produces electricity, but subsequently no longer qualifies as a cogeneration unit, then the unit shall be subject to paragraph (i) of this subdivision starting on the day on which the unit first no longer qualifies as a cogeneration unit.

(p)    "Existing EGU" means an affected EGU constructed or reconstructed on or before May 3, 2011, and is therefore not a new EGU.

(q)      “Federal MATS” means the  federal   Mercury  and  Air  Toxics  Standards, 40 C.F.R., part 63, subpart UUUUU, “National Emission Standards for Hazardous Air Pollutants: Coal- and Oil-Fired Electric Utility Steam Generating Units” (2012), adopted by reference in R 336.2502.

(r)   "Generator" means a device that produces electricity.

(s)    "Gross electric output" means electricity made available for use, including any electricity used in the power production process, which process includes, but is not limited to, any on-site processing or treatment of fuel combusted at the unit and any on- site emission controls.

(t)    "Heat input rate" means the amount of heat input (in million British thermal units) divided by unit operating time (in hours) or, with regard to a specific fuel, the amount of heat input attributed to the fuel (in million British thermal units) divided by the unit operating time (in hours) during which the unit combusts the fuel.

(u)   "Input mercury" means the amount of mercury that is contained in the coal, coal- derived fuel, and any other fuel combusted within an electric generating unit.

(v)    "Maximum design heat input" means, starting from the initial installation of a unit, the maximum amount of fuel per hour (in Btu/hour) that a unit is capable of combusting on a steady-state basis as specified by the manufacturer of the unit, or, starting from the completion of any subsequent physical change in the unit resulting in a decrease in the maximum amount of fuel per hour (in Btu per hour, Btu/hour) that a unit is capable of combusting on a steady-state basis, such decreased maximum amount as specified by the person conducting the physical change.

(w)   "Mercury emission control" means equipment installed exclusively to decrease the emissions of mercury from an affected EGU.

(x)    "Mercury pretreatment credit" means the percent of mercury removed due to coal washing or cleaning under R 336.2505.

(y)     "Monitoring system" means any monitoring system, including a continuous emissions monitoring system, an alternative monitoring system, or an accepted monitoring system approved by the department.

(z)    "Multi-pollutant compliance demonstration project" means an emission control strategy that achieves significant reductions or that maintains significant reductions in oxides of nitrogen, sulfur dioxide, and mercury using acceptable emission control equipment such as, but not limited to, selective catalytic reduction which is expected to achieve 85 to 90% reduction in oxides of nitrogen and flue gas desulfurization which is expected to achieve 85 to 95% reduction in sulfur dioxide.

(aa) "Nameplate capacity" means starting from the initial installation of a generator, the maximum electrical generating output (in megawatts) that the generator is capable of producing on a steady-state basis and during continuous operation, when not restricted by seasonal or other derates, as specified by the manufacturer of the generator or, starting from the completion of any subsequent physical change in the generator resulting in an increase in the maximum electrical generating output (in megawatts) that the generator is capable of producing on a steady-state basis and during continuous operation, when not restricted by seasonal or other derates, such increased maximum amount as specified by the person conducting the physical change.

(bb) "New EGU" means an affected EGU constructed or reconstructed after May 3, 2011.

(cc) "Operator" means any person who operates, controls, or supervises an EGU or a stationary source with 1 or more EGUs and shall include, but not be limited to, any holding company, utility system, or plant manager of such unit or stationary source.

(dd) "Output-based emissions standard" means a maximum allowable rate of emissions of mercury per unit of gross electric output from an electric generating unit.

(ee) "Owner" means any of the following persons with regard to an affected EGU or an affected EGU at a stationary source, respectively:

(i)   Any holder of any portion of the legal or equitable title in an affected EGU at the stationary source or an affected EGU.

(ii)   Any holder of a leasehold interest in an affected EGU at the stationary source or an affected EGU.

(ff) "Reference method" means any direct test method of sampling and analyzing for an air pollutant.

(gg) "Retired unit" means any EGU that has permanently been disabled and no longer has the ability to generate electricity. For the unit to re-start operations, it shall undergo new source review under R 336.1201.

(hh) "Sequential use of energy" means either of the following:

(i)     For a topping-cycle cogeneration unit, the use of reject heat from electricity production in a useful thermal energy application or process.

(ii)     For a bottoming-cycle cogeneration unit, the use of reject heat from useful thermal energy application or process in electricity production.

(ii) "Source-wide averaging" means the average of all mercury  emissions from 2 or more affected EGUs at a single stationary source is less than or equal to the average of

the mercury emission limits for the affected EGUs at the stationary source that are participating in averaging.

(jj) "Source-wide pooling" means the sum of all mercury emissions from 2 or more affected EGUs at a single stationary source is less than or equal to the sum of the mercury emission limits for the affected EGUs at the stationary source that are participating in pooling.

(kk) "Submit" means to send or transmit a document, information, or correspondence to the person specified according to the applicable regulation by any of the following:

(i)   In person.

(ii)   By United States Postal Service.

(iii)    By other means of dispatch or transmission and delivery. Compliance with any "submission" deadline shall be determined by the date of dispatch, transmission, or mailing and not the date of receipt.

(ll) "Topping-cycle cogeneration unit" means a cogeneration unit in which the energy input to the unit is first used to produce useful power, including electricity, and at least some of the reject heat from the electricity production is then used to provide useful thermal energy.

(mm) "Total energy input" means, with regard to a cogeneration unit, total energy of all forms supplied to the cogeneration unit, excluding energy produced by the cogeneration unit itself.

(nn) "Total energy output" means, with regard to a cogeneration unit, the sum of useful power and useful thermal energy produced by the cogeneration unit.

(oo) "Unit" means a stationary coal-fired boiler or a stationary coal-fired combustion turbine.

(pp) "Unit operating day" means a calendar day in which a unit combusts any fuel. (qq) "Unit operating hour or hour of unit operation" means an hour in which a unit

combusts any fuel.

(rr) "Useful power" means, with regard to a cogeneration unit, electricity or mechanical energy made available for use, excluding any such energy used in the power production process, which includes any on-site processing or treatment of fuel combusted at the unit and any on-site emission controls.

(ss) "Useful thermal energy" means, with regard to a cogeneration unit, thermal energy that is made available to an industrial or commercial process, not a power production process, excluding any heat contained in condensate return or makeup water, and is 1 or both of the following:

(i)    Used in a heat application, for example, space heating or domestic hot water heating.

(ii)    Used in a space cooling application, for example, thermal energy used by an absorption chiller.

(tt) "Utility power distribution system" means the portion of an electricity grid owned or operated by a utility and dedicated to delivering electricity to customers.

(uu) "Very low mass emitting unit" or "VLME unit" means an existing EGU that is limited to 9 pounds or less of mercury per 12-month rolling time period.

History: 2009 AACS; 2013 AACS.