Wisconsin Administrative Code › Department of Natural Resources › NR 400-499 - Environmental Protection - Air Pollution Control › Chapter NR 446 - Control Of Mercury Emissions › Subchapter III - Fired Electric Generating Units › Section NR 446.185 - Compliance alternatives

Current through June 24, 2024
(1) ALTERNATIVE
				  ANNUAL ALLOWABLE MERCURY EMISSIONS.
(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.
(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.
(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.
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.
(d) No later than May 1 of the calendar year
				  after the baseline determination year, the owner or operator of a coal-fired
				  EGU shall submit a report to the department that includes information necessary
				  to determine the baseline mercury emissions for that 5-year period.
(e) In the report required under par. (d),
				  the owners or operators of a coal-fired EGU may request alternative data be
				  used for determining baseline emissions if the data for the specified year is
				  not representative of the EGU's normal operations or maintenance
				  schedule.
(f) Baseline mercury
				  emissions for each EGU shall be determined according to the following
				  procedures:
1. Measure and determine the fuel
				  mercury content according to requirements of s.
				  NR
				  446.18(3) for all fuels combusted in
				  the EGU for the baseline determination year.
2. Calculate the baseline mercury
				  concentration, on a mmBtu-basis, for the baseline determination year according
				  to Equation 11.
See Image
where:
BMC is the average baseline mercury concentration of fuel,
					 in pounds per mmBtu, contained in the fuels combusted in the EGU during the
					 baseline determination year
Fuel Hgannual is the total mass of
					 mercury contained in the fuel determined in subd. 1.
HIi is the total amount of fuel, in
					 mmBtu, consumed each hour i, during the baseline determination year
h is the total number of hours fuel is consumed during the
					 baseline determination year
3. Calculate the baseline mercury emissions
				  according to Equation 12 as the baseline mercury concentration times the 3-year
				  average of annual fuel consumption, in mmBtu, for the baseline determination
				  year and 2 years prior to the baseline determination year.
See Image
where:
BME is the baseline mercury emissions for the EGU in
					 pounds
BMC is the baseline mercury concentration for the EGU
					 determined in subd. 2., in pounds per mmBtu.
HIi is the amount of fuel, in mmBtu
					 combusted in the EGU for each hour i during each year y
h is the total number of hours fuel is combusted in the EGU
					 during each year
(g) When determining annual allowable mercury
				  emissions for achieving compliance on a unit-by-unit basis, use one of the
				  following equations as applicable:
1. For a
				  percent reduction mercury emission limitation, Equation 13.
See Image
where:
Hgallowable is the mass of mercury
					 emissions allowed for the EGU for the compliance year
BME is the baseline emissions for the EGU as determined in
					 par. (f) 3.
Hg CE is the applicable requirement for percent mercury
					 emission reduction divided by 100.
2. For a mercury output emission limitation,
				  Equation 14.
See Image
where:
Hgallowable is the mass of mercury
					 emissions allowed for the compliance year
GEOGWh is the annual gross energy
					 output of the EGU, in GWh, as determined in s.
					 NR
					 446.18(4) for the compliance
					 year
BMC is the baseline mercury concentration determined in
					 par. (f) 2. for the EGU in pounds per mmBtu
Hg CE is the applicable requirement for percent mercury
					 control removal divided by 100
HIi is the amount of fuel, in mmBtu
					 combusted each hour i, in the baseline determination year
h is the total number of hours fuel is combusted during the
					 calendar year designated for measuring baseline emissions data under par.
					 (c)
EGWh is the annual gross electric
					 output, in GWh, for the baseline determination year calculated according to s.
					 NR
					 446.18(4) (a)