How to show the GHG Emission calculation for the new Energy update

First, you want to convert all site energy to the units of the GHG emissions factors used. For example, if the GHG emissions factors are in kg/MBtu, you would convert the energy to MBtu. To convert purchased chilled water in therms you would divide by 10 to get MBtu. Then you multiply the site energy by the applicable emissions factor, which should be determined as follows (copied from the Reference Guide):​

Use the following GHG emissions factors per fuel source (with the most recent available annual data unless otherwise indicated):

• United States or Canada:
  • Use U.S. Environmental Protection Agency’s (EPA) GHG factors for the most recently available year (see Energy Star Portfolio Manager Technical Reference: Greenhouse Gas Emissions or https://www.epa.gov/egrid/data-explorer).
    • For electricity, use indirect GHG factors per eGRID region in the U.S., and indirect GHG factors per province in Canada.
    • For fuel (including biomass), use direct GHG emissions factors per fuel source, as applicable.
    • For purchased heating or purchased chilled water, use indirect GHG emissions factors per fuel source.

  OR

• Continental US
  • Electricity hourly emissions factors: Use hourly Cambium Levelized Long-Run Marginal Emission Rates published by NREL for the project’s Generation and Emission Assessment (GEA) region with characteristics as defined in the LEED Hourly Cambium, Demand Adjusted Energy Metrics Calculator. The hourly electricity consumption is multiplied by the hourly CO2e emissions factor to determine the hourly CO2e emissions.
  • Other Fuels: Use the total CO2e emissions factors that include both direct and indirect CO2e referenced in the LEED Hourly Cambium, Demand Adjusted Energy Metrics Calculator.
  • Note: These references account for both indirect and direct emissions (i.e. combustion + pre-combustion), leading to higher reported GHG emissions for fossil fuel and for the portion of eGRID electricity generated by fossil fuel).
• European Union:
  • European Environment Agency (EEA) – National emissions reported to the United Nations Framework Convention on Climate Change (UNFCCC) and complete energy balances from Eurostat. (https://www.eea.europa.eu).
• All other locations, and EU countries without EEA data reporting
  • Climate Transparency - Enerdata national emissions factors (https://www.climate-transparency.orghttps://www.enerdata.net/).

For references above that report only electricity emissions factors, use the U.S. Environmental Protection Agency’s (EPA) direct GHG emissions per fuel source published in the Energy Star Portfolio Manager Technical Reference: Greenhouse Gas Emissions for non-electric fuel sources.

Derivation of DES purchased energy rates or conversion factors when unpublished:
If purchased energy rates, source energy conversion factors, and/or GHG Emissions factors are not published for the district energy sources serving the project, derive these purchased energy rates and/or conversion factors leveraging the electricity or fossil fuel data. For fossil fuel, use natural gas if the building does not receive fossil fuel and the district energy fuel source is unknown.

• District Chilled Water (CHW):
  CHWFactor = ElectricityFactor x 0.24
• District Hot Water (HHW):
  HHWFactor = FossilFuelFactor x 1.65
• District Steam Water (Steam):
  SteamFactor = FossilFuelFactor x 1.85