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Combined Heat and Power Partnership

CHP Emissions Calculator

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CHP Emissions Calculator
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Fuel and CO2 Emissions Savings Methodology

The Combined Heat and Power (CHP) Emissions Calculator (XLS, 2.4 MB, About XLS Exit EPA) compares the anticipated carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), carbon dioxide equivalent (CO2e), sulfur dioxide (SO2), and nitrogen oxide (NOx) from a CHP system to those of a separate heat and power system. The calculator uses fuel-specific CO2, CH4, and N2O emissions factors used in the EPA Greenhouse Gas Reporting Program, region-specific T&D loss values, and data from Emissions & Generation Resource Integrated Database (eGRID) 2012. The calculator also presents estimated emissions reductions as metric tons of carbon equivalent and emissions from passenger vehicles, as shown below.

The calculator is designed for users with at least a moderate understanding of CHP technology and its terminology. To learn more about CHP technologies, please visit the Catalog of CHP Technologies.

The estimate of environmental benefits of CHP generated by the calculator are appropriate for educational and outreach purposes only.

CHP Emissions Calculator

This image is an example of the CHP Emissions Calculator results page. For this specific calculation, installing this particular CHP system would reduce emissions of carbon dioxide by 142 tons per year. This emissions reduction is equivalent to 118 acres of pine or fir forests storing carbon for one year or emissions from 95 passenger vehicles per year.

High-Resolution Image >>

Basic Directions

The calculator provides concise instructions and default values for each of the inputs within the tool. To view input notes, move the mouse cursor over any cell with a red triangle in its upper right-hand corner.

The tool will work with a minimum of three pieces of information about the CHP system being evaluated:

  1. Technology type (also known as the CHP prime movers)
  2. Size/capacity
  3. Fuel type

For users who are interested in more accurate emissions estimates, the calculator allows users to specify up to 26 additional CHP system characteristics.

For detailed information and instructions, please refer to the user instructions tab included in the calculator. If you need help when using the tool, please contact the CHP Partnership helpline at (703) 373-8108 or email chp@epa.gov.

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