Wisconsin Administrative Code
Department of Natural Resources
NR 400-499 - Environmental Protection - Air Pollution Control
Chapter NR 446 - Control Of Mercury Emissions
Subchapter II - Control of Mercury Emissions from Major Utilities
Section NR 446.08 - Annual mercury emissions determination and reporting for major utilities

Universal Citation: WI Admin Code ยง NR 446.08

Current through August 26, 2024

(1) The owner or operator of an emissions unit subject to the requirements of s. NR 446.05 shall determine and report to the department, by March 1, annual mercury emissions for each emissions unit, beginning with calendar year 2010 emissions and ending with calendar year 2014 emissions, using the following formula:

Annual Mercury Emissions = Fuel Use x Mercury Content of Fuel x Reduction of Mercury Prior to its Release to the Atmosphere

where:

(a) Fuel use is the amount of fuel combusted in the combustion unit, as measured by the procedures specified in Appendices A, B, C and F of, incorporated by reference in s. NR 484.04(26m) (a) to (d). The total amount of the fuel combusted in mmBtus may be apportioned to individual fuels, using consumption and delivery records for the fuels.

(b) Mercury content of the fuel is determined according to ASTM D3684-01, incorporated by reference in s. NR 484.10(47m), or an equivalent method approved by the department, following the procedures in s. NR 446.07(1), (2) and (3).

(c) Reduction of mercury is calculated through source performance tests which follow the procedures in this paragraph. A value of one is assumed for natural gas fired combustion units that are exempt from performance testing under sub. (6).
1. The source performance test shall be conducted according to Method 101A in Appendix B of, incorporated by reference in s. NR 484.04(23); Method 29 in Appendix A of, incorporated by reference in s. NR 484.04(20m); Method 30A or 30B in Appendix A of, incorporated by reference in s. NR 484.04(20s) and (20t) respectively; or ASTM D6784-02, incorporated by reference in s. NR 484.10(55x).

2. A sample of the fuel burned during the test shall be analyzed for mercury content, using ASTM D3684-01, incorporated by reference in s. NR 484.10(47m), or an equivalent method approved by the department. During each of the 3 runs of the performance test, a separate sample of the fuel being burned during the run shall be collected and analyzed.

3. During the source performance testing, the consumption of fuel shall be monitored and recorded.

4. The major utility shall submit to the department the information obtained in subds. 1. to 3. and the calculations for the percent removal efficiency of mercury.

(d) The department may require that more than one source performance test be conducted if a single test is determined not to be representative of conditions at the combustion unit.

(2) Nothing in this section shall prohibit the department from requiring major utilities to use other methods of determining annual mercury emissions.

(3) The owner or operator of a major utility may request that alternative methods for determining annual mercury emissions be approved by the department.

(4) All units subject to s. NR 446.05, with an electrical generating capacity equal to or greater than 200 MW, and all units that undergo process changes or change control equipment after January 1, 2006, shall have source performance tests conducted during calendar years 2010 and 2013.

(5) The owner or operator of a major utility shall use the results of the most recently conducted source performance test for calculating the reduction efficiency under sub. (1) (c).

(6) Combustion units subject to s. NR 446.06 that exclusively combust natural gas are not subject to the source performance testing requirements of this section.

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