Section 463-80-050. Calculating total carbon dioxide emissions to be mitigated.

(1) Step 1 is to calculate the total quantity of CO2. The total quantity of CO2 is referred to as the maximum potential emissions of CO2. The maximum potential emissions of CO2 is defined as the annual CO2 emission rate. The annual CO2 emission rate is derived by the following formula unless a differing analysis is necessary or appropriate for the electric generating process and type of equipment:

where:

(a) When there are multiple new fossil-fueled electric generating units, the above calculation will be performed for each unit and the total CO2 emissions of all units will be summed.

(b) When a unit or facility is allowed to use multiple fuels, the maximum allowed hours on the highest CO2 producing fuels will be utilized for each fuel until the total of all hours per fuel add up to the allowable annual hours.

(c) When a new unit or facility is allowed to use multiple fuels without restriction, this calculation will be performed assuming that the fuel with the highest CO2 emission rate is used 100% of the time.

(d) When the annual operating hours are restricted for any reason, the total of all T1 - n hours equals the annual allowable hours of operation in the site certification agreement.

(e) Fuel to CO2 conversion factors (derived from the EPA's AP-42, Compilation of Air Pollutant Emission Factors):

(2) Step 2 - Insert the annual CO2 rate to determine the total carbon dioxide emissions to be mitigated. The formula below includes specifications that are part of the total carbon dioxide definition:

(3) Step 3 - Determine and apply the cogeneration credit (if any). Where the cogeneration unit or facility qualifies for cogeneration credit, the cogeneration credit is the annual CO2 emission rate (in metric tons per year) and is calculated as shown below or similar method:

where:

Calculate the metric tons of the cogeneration credit over the 30 year period.

(4) Step 4 - Apply the mitigation factor.

(a) RCW 80.70.020(4) states that "Fossil-fueled thermal electric generation facilities that receive site certification approval or an order of approval shall provide mitigation for twenty percent of the total carbon dioxide emissions produced by the facility."

(b) The CO2 emissions mitigation quantity is determined by the following formula:

where:

(5) Additional restrictions for modifications to an existing facility not involving installation of new generating units. The quantity of CO2 to be mitigated is calculated by the same methods used for the new generating units with the following restrictions:

(a) The quantity of CO2 subject to mitigation is only that resulting from the modification and does not include the CO2 emissions occurring prior to the modification;

(b) An increase in operating hours or other operational limitations established in a site certification agreement is not an exempt modification under this regulation. However, only increased CO2 emissions related to the increase in operating hours or changes to any other operational restriction are subject to the CO2 mitigation program requirements;

(c) The annual emissions (CO2rate) is the difference between the premodification condition and the postmodification condition, but using the like new heat rate for the combustion equipment; and

(d) The cogeneration credit may be used, but only if it is a new cogeneration credit, not a cogeneration agreement or arrangement established prior to July 1, 2004, or used in a prior CO2 mitigation evaluation.

[Statutory Authority: Chapters 80.70 and 80.80 RCW and RCW 80.50.040. WSR 08-14-064, § 463-80-050, filed 6/25/08, effective 7/26/08.]

Chapters 80.70 and 80.80 RCW and RCW 80.50.040. WSR 08-14-064, § 463-80-050, filed 6/25/08, effective 7/26/08.