greenhouse gas emissions in two different ways: the in-boundary inventory
and the consumption-based
inventory. The inventories
utilize different accounting methods and each encompasses a unique scope of
emissions. This page summarizes the in-boundary inventory.
inventory tracks greenhouse gas emissions that occur within Oregon’s borders
and the emissions associated with Oregonian’s electricity use. This
comprehensive inventory allows Oregon to evaluate progress toward meeting
emissions reduction goals.
Included in this
inventory are emissions from the key emissions sectors: agriculture, industrial, residential, commercial, transportation
and electricity use. For the electricity sector the
emissions at the point of generation for all electricity used in Oregon are
included, regardless of where that electricity was produced.
Starting with the 2010
emission year, data collected through DEQ’s mandatory Greenhouse Gas Reporting Program became the primary source of data used to update
the inventory. The reporting program annually collects greenhouse gas emissions
information from certain facilities, including industrial facilities with air
quality permits, wastewater treatment facilities, fuel distributors, natural
gas, electricity suppliers and large landfills. Approximately 80 percent of the
total emissions in the inventory for 2010 through the most recent inventoried
year are derived from reported data. DEQ publishes this reported data on
our greenhouse gas emissions website.
estimations associated with sectors not covered by the reporting program, such
as agriculture, and for historic inventory values, DEQ uses model outputs from
the estimates generated by DEQ’s
Materials Management Program.
Preliminary emissions data
In order to provide the most current emissions estimates possible, DEQ develops preliminary greenhouse gas estimates. DEQ integrates mandatory greenhouse gas reported data for the industrial, natural gas, electricity, waste and fuel sectors with the most recent data outputs from the EPA State Inventory Tool to develop these preliminary emission estimates. When an updated version of the State Inventory Tool becomes available, DEQ will update and finalize preliminary emission estimates. DEQ is committed to updating the inventory on an annual basis.
It is good practice to update emission estimations when improved methods or data become available. Each year emissions data is recalculated and revised for all years in the inventory (1990 through the present). For this reason published data sets may vary from year to year.