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REGULATION FOR THE MANDATORY REPORTING OF GREENHOUSE GAS EMISSIONS - page 135 / 137

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6. Method for Calculating Emissions of High Global Warming Potential Compounds

Provided below is the fugitive SF6 emissions calculation methodology created by the U.S. EPA SF6 Emission Reduction Partnership for Electric Power Systems. Operators shall use this approach or a service log for estimating fugitive emissions of high global warming potential compounds, including SF6, HFCs, and PFCs, as specified in sections 95111(f)-(g) of the regulation. The reporting form that follows the method below is for illustrative purposes. Pounds shall be converted to kilograms for purposes of reporting. ------------------------------------------------------------------------------------------------------------

SF6 EMISSIONS INVENTORY REPORTING METHOD AND FORM

This worksheet is based on the mass-balance method. The mass-balance method works by tracking and systematically accounting for all operator uses of SF6 during the reporting year. The quantity of SF6 that cannot be accounted for is then assumed to have been emitted to the atmosphere. The method has four subcalculations (A-D), a final total (E), and an optional emission rate calculation (F) as follows:

A. Change in Inventory. This is the difference between the quantity of SF6 in storage at the beginning of the year and the quantity in storage at the end of the year. The “quantity in storage” includes SF6 gas contained in cylinders (such as 115-pound storage cylinders), gas carts, and other storage containers. It does not refer to SF6 gas held in operating equipment. The change in inventory will be negative if the quantity of SF6 in storage increases over the course of the year.

B. Purchases/Acquisitions of SF6. This is the sum of all the SF6 acquired from other entities during the year either in storage containers or in equipment.

C. Sales/Disbursements of SF6. This is the sum of all the SF6 sold or otherwise disbursed to other entities during the year either in storage containers or in equipment.

D. Change in Total Nameplate Capacity of Equipment. This is the net increase in the total volume of SF6-using equipment during the year. Note that “total nameplate capacity” refers to the full and proper charge of the equipment rather than to the actual charge, which may reflect leakage. This term accounts for the fact that if new equipment is purchased, the SF6 that is used to charge that new equipment should not be counted as an emission. On the other hand, it also accounts for the fact that if the amount of SF6 recovered from retiring equipment is less than the nameplate capacity, then the difference between the nameplate capacity and the recovered amount has been emitted. This quantity will be negative if the retiring equipment has a total nameplate capacity larger than the total nameplate capacity of the new equipment.

E. Total Annual Emissions. This is the total amount of SF6 emitted over the course of the year, based on the information provided above. The amount is presented both in pounds of SF6 and in metric tonnes of CO2-equivalent, that is, the quantity of carbon dioxide emissions that would have the same impact on the climate as the quantity of SF6 emitted. Because SF6 has 23,900 times the ability of carbon dioxide to trap heat in the atmosphere on a pound-for-pound basis, 1 pound of SF6 is equivalent to nearly 11 metric tonnes of carbon dioxide.

Appendix A-19

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