As part of the annual process to develop the U.S. Inventory of Greenhouse Gas Emissions and Sinks (GHG Inventory), EPA assessed new data for updates to its estimates for natural gas and petroleum systems. EPA updated its estimates for natural gas systems in the production segment and updated its estimates for petroleum systems in the production and refining segments.
Please see the memos below for information on these updates. The natural gas and petroleum systems methodology annexes for the 1990-2018 GHG Inventory are available below as well.
For previously posted information from the stakeholder process, view the archives of memos and presentation slides regarding updates considered for the 1990-2018 GHG Inventory are available below as well.
View information about revisions to estimates for natural gas and petroleum systems in the GHG Inventory for earlier Inventory release years.
- Annex 3.5: Methodology for Estimating CH4, CO2, and N2O Emissions from Petroleum Systems(301 K)
- Annex 3.6: Methodology for Estimating CH4, CO2, and N2O Emissions from Natural Gas Systems(474 K)
Memos on updates to estimates for natural gas and petroleum systemsYou may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.