The Greenhouse Gas Protocol Initiative: GHG Emissions from Purchased Electricity
The Greenhouse Gas Protocol tool for purchased electricity is a free Excel spreadsheet calculator designed to calculate GHG emissions specifically from the purchase of electricity. The methodologies embedded in the tool are based on the Greenhouse Gas Protocol developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD). Purchased electricity emissions are indirect emissions most frequently classified as scope 2 emissions. This calculator can be used to develop a GHG emissions baseline specifically for a community's electricity purchases and to develop annual inventories to assist in the tracking of emissions thereafter.
Inputs and Outputs
Inputs include: The user must input the amount of electricity consumed (e.g., in kWh) during the reporting period. Electricity may be entered on a facility level, with the percentage of the facility controlled by the reporting entity. The user must also specify the country and utility region (e.g., eGRID subregion, if applicable). For some countries, the user must specify the fuel mix (i.e., coal, oil, gas). The user may also input custom fuel mixes and emission factors instead of using the default emission factors embedded within the spreadsheet.
Outputs include: The tool outputs greenhouse gas emissions (carbon dioxide, methane, nitrous oxide, and carbon dioxide equivalent) for each facility as well as total emissions for all facilities.
GHG Protocol's purchased electricity tool includes country (and, where available, region) specific emission factors for electricity. For U.S. users, regional factors from the Emissions & Generation Integrated Database (eGRID) are embedded in the tool.
Users can access the full methodology embedded in the tool through an accompanying guidance document.
This tool represents one of the Greenhouse Gas Protocol Initiative's several cross-sector spreadsheets that can be used separately or in conjunction to develop a GHG inventory of various emissions sources within a community. Separate calculators are available for emissions from stationary combustion, transport or mobile sources, refrigeration and air conditioning equipment, and several industrial sectors.