An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »


eGRID Related Materials


eGRID uses data from both EPA' Clean Air Markets Divison (CAMD) and the Energy Information Administration (EIA) to determine carbon dioxide (CO2), nitrogen oxides (NOX), sulfur dioxide (SO2), and mercury (Hg) emissions. Neither CAMD nor EIA collect data specifically on PM2.5 emissions. However, EPA’s National Emissions Inventory (NEI) is a source of PM2.5 emissions data. The annual emissions of air pollutants, including PM2.5, from most electric generating units are reported to the NEI.

EPA uses the NEI data to determine PM2.5 emissions at electric generating units for 2018. The paper below discusses the methods used to determine PM2.5 emissions and emission rates, including steps to estimate emissions for units that may not report to the NEI. Additionally, the data file below presents unit-level estimates of PM2.5 emissions and emission rates, as well as, emissions and emission rates at the state and eGRID subregion levels for 2016 and 2018.

EPA is considering whether to incorporate PM2.5 in future eGRID releases, and is requesting feedback on the methodology and data. Please email your feedback, questions, and suggestions to

Using eGRID for Environmental Footprinting of Electricity Purchases

A paper which describes how to use eGRID to calculate emissions associated with electricity purchases.