DEQ inventories greenhouse gas emissions in two different ways: the sector-based, formally 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 sector-based inventory.
Oregon’s sector-based 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 anthropogenic 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 is 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, fuel distributors, natural gas suppliers, 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 mandatory reported data on our greenhouse gas emissions website.
For emissions estimations associated with sectors not covered by the reporting program, such as agriculture, and for historic inventory values, DEQ uses model outputs from EPA's State Invertory Tool (SIT) and 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 updates and finalizes 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.