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Hourly Energy Emission Factors for Electricity Generation in the United States

Published by National Renewable Energy Laboratory | Department of Energy | Metadata Last Checked: January 27, 2026 | Last Modified: 2023-02-20T19:28:11Z
Monthly average hourly CO2, NOx, and SO2 emission factors for each U.S. eGRID subregion. This project utilized GridViewTM, an electric grid dispatch software package, to estimate hourly emission factors for all of the [eGRID](https://www.epa.gov/egrid) subregions in the continental United States. These factors took into account electricity imports and exports across the eGRID subregion boundary, and included estimated transmission and distribution (T) losses. Emission types accounted for included carbon dioxide (CO2), nitrogen oxides (NOx), and sulfur dioxide (SO2).Data reported as part of this project include hourly average, minimum, and maximum emission factors by month; that is, the average, minimum, and maximum emission factor for the same hour of each day in a month. Please note that the data are reported in lbs/MWh, where the MWh value reported is site electricity use (the actual electricity used at the building) and the pounds of emissions reported are the emissions created at the generator to meet the building load, including transmission and distribution losses. The demand profiles used to generate the data pertain to the following years: eastern interconnect - 2005; Electricity Reliability Council of Texas (ERCOT) - 2008; Western Electricity Coordinating Council (WECC) - 2008.

Resources

25 resources available

  • Emissions and Generation Resource Integrated Database eGRID

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  • US Monthly Average Hourly Emission Factors for SRMV.csv

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  • US Monthly Average Hourly Emission Factors for AZNM.csv

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  • US Monthly Average Hourly Emission Factors for CAMX.csv

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  • US Monthly Average Hourly Emission Factors for ERCT.csv

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  • US Monthly Average Hourly Emission Factors for FRCC.csv

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  • US Monthly Average Hourly Emission Factors for MROE.csv

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  • US Monthly Average Hourly Emission Factors for MROW.csv

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  • US Monthly Average Hourly Emission Factors for NEWE.csv

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  • US Monthly Average Hourly Emission Factors for NWPP.csv

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  • US Monthly Average Hourly Emission Factors for NYCW.csv

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  • US Monthly Average Hourly Emission Factors for NYLI.csv

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  • US Monthly Average Hourly Emission Factors for NYUP.csv

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  • US Monthly Average Hourly Emission Factors for RFCE.csv

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  • US Monthly Average Hourly Emission Factors for RFCM.csv

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  • US Monthly Average Hourly Emission Factors for RFCW.csv

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  • US Monthly Average Hourly Emission Factors for RMPA.csv

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  • US Monthly Average Hourly Emission Factors for SPNO.csv

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  • US Monthly Average Hourly Emission Factors for SPSO.csv

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  • US Monthly Average Hourly Emission Factors for SRMW.csv

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  • US Monthly Average Hourly Emission Factors for SRSO.csv

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  • US Monthly Average Hourly Emission Factors for SRTV.csv

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  • US Monthly Average Hourly Emission Factors for SRVC.csv

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  • CO2 Emission Charts for all eGRID subregions.pdf

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  • US Monthly Average Hourly Emission Factors by eGRID Subregion.xlsx

    XLSX

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