Managed Emission Factors - US eGRID Electricity factors
The US EPA (Environmental Protection Agency) publishes eGRID database (Emissions & Generation Resource Integrated Database) roughly every one or two years. The eGRID is a comprehensive source of data from EPA's Clean Air Markets Division on the environmental characteristics of almost all electric power generated in the United States. The data includes emissions, emission rates, generation, heat input, resource mix, and many other attributes. eGRID is typically used for greenhouse gas registries and inventories, carbon footprints, consumer information disclosure, emission inventories and standards, power market changes, and avoided emission estimates.
In Envizi, this factor set is being applied as the default Electricity emission factor set for electricity consumption reported from the US (including Puerto Rico). This factor set applies to both Electricity Scope 2 and Scope 3 (for reporting of electricity consumption not directly under operational control) consumption data. The indirect adjustment factors for transmission and distribution losses are included since factor year 2021.
Envizi has managed this factor set since 2008. There is no fixed date for the factor set publishing. In the past it has followed a rough time interval of every two years, usually published in the first quarter of a year. Since year 2020 the schedule has been adjusted to once a year.
Envizi in general loads latest eGRID factors into the Envizi platform as soon as it is published by the US EPA. This factor set is a free resource openly available on US EPA’s website.
Website | |
Upcoming publication date | Publishes annually in first quarter of a year. Upcoming publication date: Jan 2025 |
Geographical coverage | By default factors are applied to both Electricity Scope 2 and Scope 3 (location based factors) consumption data for US only (including Puerto Rico) |
Data type coverage | Scope 2: electricity and electricity green offset Scope 3: electricity |
Effective and Published dates | Effective dates always starts with first month of a calendar year and ends with the last month of a calendar year. e.g, effective from = Jan-2016 and effective to = Dec-2017. Published dates are aligned with when the factor set is published and available on the US EPA website, and the time when a new factor set is published. For example, one of the existing batches has publish from = Mar-2021 and publish to = Jan-2022. For more information on effective and published dates see this article. If you require a custom period for your factors this will need to be managed as custom factors. |
Global Warming Potential (GWP) | Factors with effective date later than 2012 use GWP defined by 2007 IPCC AR4 (N2O GWP = 298, CH4 GWP = 25) for equivalent CO2 amount calculations. Factors with effective data later than 2022 (publish date 2024) use GWP defined by 2014 IPCC AR5 (N2O GWP = 265, CH4 GWP = 28) for equivalent CO2 amount calculations. |
Indirect CO2e | Indirect factors associated with electricity transmission and distribution line loss is calculated as Total CO2e * Grid Gross Loss % / (1 - Grid Gross Loss %), with factors associated with eGRID regions using eGRID region specific GGL values, and factors associated with US state regions using the US average GGL value. Indirect factor calculation methodology is adopted from the annual EPA documentation - eGRID Technical Guide. Indirect CO2e factor values is a relatively new addition to the factor set since year 2023. Indirect factor values are back filled three years to cover eGRID factors from year 2021 to year 2023. |
Managed publications and effective periods
Factor Source Reference | Effective From | Effective To | Published From | Published To |
|---|---|---|---|---|
eGRID (Year 2005 Data). URL: http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html Original file name eGRID2005_aggregation.xls, tab name: SRL05.GWP and ST05.GWP | 31/12/2006 | 30/4/2010 | ||
eGRID (Year 2007 Data). URL: http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html Original file name eGRID2010V1_1_year07_AGGREGATION.xls, tab name: ST07.GWP and SRL07 | 1/1/2007 | 31/12/2008 | 1/5/2011 | 31/3/2012 |
eGRID (Year 2009 Data). URL: http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html Original file name eGRID2012V1_0_year09_DATA.xls, tab name: ST09 and SRL09. | 1/1/2009 | 31/12/2009 | 1/4/2012 | 31/1/2014 |
eGRID 9th Edition V 1.0 (Year 2010 Data). URL: http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html Original file name eGRID2010_Data.xls, tab name: SRL10 and ST10. | 1/1/2010 | 31/12/2011 | 1/2/2014 | 30/9/2015 |
eGRID 2012 File (Year 2012 Data). URL: http://www.epa.gov/cleanenergy/energy-resources/egrid/index.html Original file name eGRID2012_Data.xls, tab name: SRL12 and ST12. | 1/1/2012 | 31/12/2013 | 1/10/2015 | 28/2/2017 |
Year 2014 data. Revised Release (v2): 2/27/2017 Original file name eGRID2014Data_v2.xls, tab name: SRL14 and ST14. Source: https://www.epa.gov/egrid | 1/1/2014 | 31/12/2015 | 1/3/2017 | 28/2/2018 |
Year 2016 data, published 2/15/2018. Original file name eGRID2016_summarytables.xls, tab name: Table 1 and ST16. Source: https://www.epa.gov/egrid | 1/1/2016 | 31/12/2017 | 1/3/2018 | 31/1/2020 |
Year 2018 data, published 1/28/2020. Original file name: eGRID2018_summary_tables.xls, tab name: Table 1 and Table 3. Source: https://www.epa.gov/egrid | 1/1/2018 | 31/12/2018 | 1/2/2020 | 28/2/2021 |
Year 2019 Data: 2/23/2021.Original file name: eGrid2019_summary_tables.xls, tab name: Table 1 and Table 3. Source: https://www.epa.gov/egrid | 1/1/2019 | 31/12/2019 | 1/3/2021 | 31/1/2022 |
Year 2020 Data: 1/27/2022.Original file name: eGrid2020_summary_tables.xls, tab name: Table 1 and Table 3. Source: https://www.epa.gov/egrid | 1/1/2020 | 31/12/2020 | 1/2/2022 | 31/1/2023 |
Year 2021 Data: 1/30/2023.Original file name: eGrid2021_summary_tables.xlsx, tab name: Table 1 and Table 3. Source: https://www.epa.gov/egrid | 1/1/2021 | 31/12/2021 | 1/2/2023 | 31/1/2024 |
Year 2022 Data: 1/30/2024.Original file name: eGrid2022_summary_tables.xlsx, tab name: Table 1 and Table 3. Source: https://www.epa.gov/egrid | 1/1/2022 | 1/2/2024 |