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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. In 2011 PSE will begin disclosing, on an annual basis, its emissions to the EPA. Washington state law will require an identical disclosure beginning in 2013.

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