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GHG Reporting Consolidator

Consolidate Scope 1 and Scope 2 emissions into a single CO2e inventory

Free greenhouse gas reporting consolidator. Enter Scope 1 stationary combustion (by fuel type), Scope 1 fugitive/process emissions (refrigerants, SF6, process CO2), and Scope 2 purchased electricity (with eGRID subregion factors) to get total CO2 equivalent emissions in metric tons per year. Includes breakdown by scope and source.

Pro Tip: For Scope 2, using the right eGRID subregion makes a big difference. A facility in NYUP (upstate New York, mostly hydro and nuclear) has a grid factor of 275 lb CO2/MWh. The same usage in MROE (Midwest coal-heavy) would be 1,480 lb CO2/MWh - over 5x higher. Check the eGRID Power Profiler to find your subregion from your ZIP code.

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GHG Reporting Consolidator
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How It Works

  1. Enter Scope 1 Combustion Sources

    Add each fuel-burning source (boilers, heaters, generators) with fuel type and annual consumption. The calculator applies 40 CFR Part 98 emission factors for CO2, CH4, and N2O.

  2. Enter Scope 1 Fugitive/Process Emissions

    Add refrigerant leaks, SF6 losses, process CO2, or other fugitive GHG sources. Enter the amount leaked in kg and select the gas type. GWP values auto-fill.

  3. Enter Scope 2 Electricity

    Input annual electricity consumption in MWh and select your eGRID subregion. The calculator applies the regional grid emission factor.

  4. Review Consolidated Inventory

    See total CO2e broken down by Scope 1 (combustion + fugitive) and Scope 2 (electricity). The source-level breakdown shows where the largest contributions come from.

Built For

  • Corporate sustainability teams preparing annual GHG inventories for ESG disclosure
  • Facility managers compiling Scope 1+2 emissions for CDP or SBTi reporting
  • Environmental consultants preparing baseline GHG inventories for reduction planning
  • Energy managers identifying the largest GHG sources for reduction prioritization
  • Facilities subject to EPA Mandatory Reporting Rule (40 CFR Part 98) threshold screening

Assumptions

  • Combustion emission factors are from 40 CFR Part 98 Tables C-1 and C-2.
  • GWP values use IPCC AR5 defaults (CH4=28, N2O=265).
  • Grid emission factors are from EPA eGRID 2022.
  • Scope 2 uses location-based methodology (grid average, not market-based/RECs).

Limitations

  • Scope 3 emissions (supply chain, transportation, product use) not included.
  • Market-based Scope 2 accounting (RECs, green power purchases) not supported.
  • Does not include process-specific emission calculation methodologies.
  • eGRID factors are U.S.-only; international grid factors not included.

References

  • 40 CFR Part 98 - Mandatory Greenhouse Gas Reporting
  • EPA eGRID - Emissions & Generation Resource Integrated Database (2022)
  • GHG Protocol Corporate Accounting and Reporting Standard
  • IPCC Fifth Assessment Report (AR5) - Global Warming Potentials
  • EPA Center for Corporate Climate Leadership - Scope 1 and Scope 2 Inventory Guidance

Frequently Asked Questions

Scope 1 covers direct GHG emissions from sources owned or controlled by the facility: fuel combustion in boilers/generators, process emissions, and fugitive emissions (refrigerant leaks, natural gas leaks). Scope 2 covers indirect emissions from purchased electricity, steam, or heating/cooling. A third category, Scope 3, covers supply chain and product use emissions but is not included in this tool.
eGRID (Emissions & Generation Resource Integrated Database) divides the US into roughly 25 subregions based on the power grid. Each subregion has a different mix of generation sources (coal, gas, nuclear, renewables), resulting in different emission factors per MWh of electricity. Your utility bill or the EPA Power Profiler tool can tell you which subregion your facility is in.
Under the EPA Mandatory Reporting Rule (40 CFR Part 98), facilities that emit 25,000 metric tons or more of CO2e per year from covered source categories must report annually. This applies to power plants, refineries, cement plants, steel mills, and other large emitters. Smaller facilities may still need to report under state programs or voluntary frameworks.
Scope 3 emissions (supply chain, business travel, product use, waste disposal) require fundamentally different data sources and methodologies than Scope 1 and 2. They involve life cycle analysis, supplier surveys, and estimation models that go beyond simple emission factor calculations. Most reporting frameworks allow companies to report Scope 1+2 first and add Scope 3 categories progressively.
Disclaimer: This consolidator provides Scope 1+2 GHG inventory estimates using EPA emission factors and eGRID data. Scope 3 emissions are not included. For mandatory reporting under 40 CFR Part 98, facilities must use source-specific calculation methodologies and report through EPA's electronic greenhouse gas reporting tool (e-GGRT). This tool provides planning-level estimates.

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Scope 1, 2, and 3 greenhouse gas emissions, EPA mandatory reporting rule (40 CFR 98), GWP values, CO2 equivalent calculations, and reporting thresholds.

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