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Greenhouse Gas Inventory Report

Since 2002, PSE has undertaken a voluntary inventory of greenhouse gas (GHG) emissions associated with its power-supply portfolio. Early editions of the inventory followed the protocols established by the World Resource Institute GHG Protocol (GHG Protocol). Beginning in 2009, PSE adopted the Environmental Protection Agency methodology for calculating its direct emissions. PSE reports its direct emissions annually to EPA and the Washington Department of Ecology. PSE also reports its portfolio-wide (direct and indirect) electric emissions to the Washington Utilities and Transportation Commission.

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