(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.
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.
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.
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.
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)
(2) ALTERNATIVE
SO2 COMPLIANCE DETERMINATION.
(a) The owner or operator of a coal-fired EGU
may demonstrate compliance with the SO2 emission
limitation in s.
NR 446.14(1) by demonstrating a minimum
SO2 control efficiency equal to or greater than 90%
removal of sulfur from fuels combusted in the EGU each year, excluding startup
and shutdown, using a method approved by the department.
(b) If electing to demonstrate compliance
according to par. (a), the owners or operators of a coal-fired EGU shall submit
an SO2 compliance demonstration procedure for department approval no later than
October 1, 2013. The compliance procedure shall include test methods to
determine sulfur removal from fuel and operating and parametric monitoring
procedures to ensure continuous operation of control equipment consistent with
maintaining the required control efficiency.
(3) ALTERNATIVE METHODS AND PROCEDURES. The
owner or operator of a coal-fired EGU may use methods and procedures in
determining annual allowable emissions as approved by the department to account
for any of the following:
(a) The
contribution to mercury emissions by non-fuel materials inherent to pollution
control processes. The contribution to the annual allowable emissions may not
exceed the amount calculated when substituting annual mercury content of
non-fuel materials for annual fuel mercury content in Equation 7 in s.
NR 446.18(5) (a) 1.
(b) When monitoring or implementing control
equipment for a stack serving multiple EGUs.
