NR 446.17(3)
(3) Bact determination for small coal-fired electric generating units. NR 446.17(3)(a)(a) No later than June 30, 2011, owners or operators of small coal-fired EGUs subject to
s. NR 446.12 shall provide the department with a preliminary BACT determination.
NR 446.17(3)(b)
(b) Notwithstanding
par. (a), a small coal-fired EGU designated by the department under
sub. (2) to meet the emission limitations in
s. NR 446.13 or
446.14 are not required to provide a preliminary BACT determination.
NR 446.17(3)(c)
(c) The owner or operator shall submit the information required in
par. (a) on the application form required for an operation permit, an amendment to an application, or renewal of the operation permit, as applicable.
NR 446.17(3)(d)
(d) Within 180 days after the receipt of the information in
par. (c), the department shall approve, conditionally approve or disapprove the owner's or operator's preliminary BACT determination.
NR 446.17 History
History: CR 07-036: cr.
Register November 2008 No. 635, eff. 12-1-08;
CR 13-089: am. (1) (intro.) Register July 2014 No. 703, eff. 8-1-14. NR 446.18
NR 446.18
Emission determination and compliance demonstration. NR 446.18(1)(1)
Monitoring requirements. Owners and operators of a coal-fired EGU affected by this subchapter shall monitor emissions, heat input, electricity generation and process thermal energy, as required to demonstrate compliance, according to the following methods and specifications:
NR 446.18(1)(b)
(b) For mercury, hourly mass emissions using continuous emission monitoring. By December 31, 2013, the department shall promulgate rules that specify the requirements for continuous emission monitoring for purposes of this paragraph.
NR 446.18 Note
Note: On February 8, 2008, the U.S. District Court of Appeals for the D.C. Circuit vacated rules the department had intended to rely on related to continuous emission monitoring for mercury emissions. (See
New Jersey, et. al. v. Environmental Protection Agency, D.C. Ct. App. No
05-1097, February 8, 2008.)
NR 446.18(1)(d)
(d) For gross electric output, hourly megawatt-hours using continuous monitoring.
NR 446.18(1)(e)
(e) For process thermal energy input, hourly mmBtus delivered to the process using continuous monitoring.
NR 446.18(2)
(2) Determining annual actual emissions. Owners and operators of a coal-fired EGU affected by this subchapter shall determine annual mass of actual emissions for each pollutant as the sum of monitored emissions according to Equation 1.
where:
Pactual is the mass of mercury, NOx or SO2 emitted during the compliance year
Pmonitored is the mass of mercury, NOx or SO2 emissions monitored and determined for each hour i the EGU is operated during the compliance year
n is the number of hours the EGU is operating during the compliance year
NR 446.18(3)
(3) Determining annual fuel mercury content. Owners and operators of a coal-fired EGU affected by this subchapter shall determine the annual mass of mercury contained in all combusted fuels, as required to demonstrate compliance, according to the following procedures:
NR 446.18(3)(a)
(a) Calculate the mass of mercury contained in each fuel for each month, according to Equation 2, as the mercury concentration in fuel combusted each month as determined following the procedures in
s. NR 446.07 (1),
(2) and
(3) according to solid and non-solid types of fuel, multiplied by the amount of fuel, in mmBtu, combusted each month as determined following the procedures in
s. NR 446.07 (4).
where:
Fuel Hgfm is the mass of mercury contained in fuel f, in month m
HIfm is the heat input of the combusted fuel f, in month m
Hg Cfm is the mercury concentration for fuel f, in month m
NR 446.18(3)(b)
(b) Calculate the annual mass of mercury, according to Equation 3, as the sum of mercury contained in all fuels combusted for all months during the compliance year.
where:
Fuel Hgannual is the mass amount of mercury contained in all fuels combusted during the compliance year
Fuel Hgi is the mercury mass content for fuel i, combusted in month m, during the compliance year determined in par. (a)
f is number of fuels combusted during the compliance month
NR 446.18(4)
(4) Determining annual gross output. Owners and operators of a coal-fired EGU affected by this subchapter shall determine the annual gross energy output in gigawatt-hours, as required to demonstrate compliance, according to the following procedures:
NR 446.18(4)(a)
(a) Calculate the annual gross electric output in gigawatt-hours, according to Equation 4, as the sum of gross electric output measured in megawatt-hours for each hour the EGU is operating.
where:
EGWh is the total annual gross electric output in GWh
MWhi is the gross electric output in MWh for each hour i the EGU operated during the compliance year
1,000 is the factor to convert MWh to GWh
n is the number of hours the EGU operated during the compliance year
NR 446.18(4)(b)
(b) Calculate the annual amount of useful thermal energy in mmBtu, according to Equation 5, as the sum of the process thermal energy input for each hour the EGU is operated multiplied by the process energy efficiency.
where:
UTEannual is the annual amount of thermal energy, in mmBtu, utilized in the cogeneration process
PTEIi is the amount of thermal energy input, in mmBtu, made available to the cogeneration process for each hour i the EGU operated during the compliance year
PEE is the process energy efficiency, expressed as a percent, measured for the EGU. A value of 50% may be assumed.
n is the number of hours the unit operated during the year of compliance
NR 446.18(4)(c)
(c) Calculate the annual gross energy output in mmBtu, according to Equation 6, as the sum of the annual gross electric output and the annual applied thermal energy converted to electric output.
where:
GEOGWh is the total annual gross energy output in GWh
EGWh is the total annual gross electric output in GWh determined in par. (a)
UTEannual is the total annual useful thermal energy in mmBtu determined in par. (b)
3,413 is the factor to convert thermal energy in mmBtu to GWh
NR 446.18(5)
(5) Determining annual allowable emissions. Except as provided in
s. NR 446.185, owners and operators of a coal-fired EGU affected by this subchapter shall determine annual allowable emissions, as required to demonstrate compliance, according to the following procedures:
NR 446.18(5)(a)
(a) When achieving compliance on a unit-by-unit basis, use one of the following equations as applicable:
NR 446.18(5)(a)1.
1. For a percent reduction mercury emission limitation, Equation 7.
where:
Hgallowable is the mass of mercury emissions allowed for the compliance year
Fuel Hgannual is the mass of mercury in fuel combusted during the compliance year as determined in sub. (3) (b).
Hg CE is the applicable requirement for percent mercury emission reduction divided by 100.
where:
Hgallowable is the mass of mercury emissions in pounds allowed for the compliance year
GEOGWh is the annual gross energy output during the compliance year as determined in sub. (4) (c)
ELoutput is the applicable mercury output based emission limitation in pounds per GWh
where:
Pallowable is the mass of NOx or SO2 emissions allowed for the compliance year
HIi is the amount of fuel, in mmBtu combusted each hour i, during the compliance year
h is the number of hours fuel is combusted during the compliance year
EL
p is the applicable emission limitation of
s. NR 446.14 (1) for NO
x or SO
2
where:
Unit Averaging Pallowable is the mass of mercury, NOx, or SO2 emissions allowed for each pollutant determined in par. (a) for each EGU participating in emissions averaging during the compliance year
Pu is the lowest annual allowable mass of mercury, NOx or SO2 emissions allowed for the compliance year for each EGU as determined under par. (a) or applicable under any other enforceable state or federal requirement for each EGU participating in emissions averaging during the compliance year
n is the number of EGUs participating in emissions averaging
NR 446.18 History
History: CR 07-036: cr.
Register November 2008 No. 635, eff. 12-1-08.
NR 446.185(1)
(1)
Alternative annual allowable mercury emissions. NR 446.185(1)(a)(a) Owners and operators of a coal-fired EGU affected by this subchapter may use baseline mercury emissions approved by the department as an alternative to procedures in
s. NR 446.18 (5) (a) in determining annual allowable mercury emissions.
NR 446.185(1)(b)
(b) Baseline mercury emissions shall be determined and used for calculating annual allowable mercury emissions for 5-year periods beginning with the period of 2016 to 2020. Baseline mercury emissions shall be determined every 5 years and used to calculate annual allowable mercury emissions for the subsequent 5-year period.
NR 446.185(1)(c)
(c) Baseline mercury emissions for each 5-year period shall be determined using fuel mercury content data measured for the calendar year which is 2 years prior to the first year of the applicable 5-year period. The year designated for measuring fuel mercury content is the baseline determination year.
NR 446.185 Note
Note: Baseline emissions are measured for 2013 for determining the annual allowable emissions for compliance years 2015 to 2019, measured for 2018 for determining allowable emissions for compliance years 2020 through 2024, etc.
