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. Beginning in 2009, PSE adopted the Environmental Protection Agency (EPA) methodology for calculating its direct emissions. In 2011, PSE began disclosing its emissions on an annual basis to the EPA. Washington state law requires an identical disclosure which began in 2013.

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