eGrid subregions are areas in the US defined by the Environmental Protection Agency (EPA) based on the electricity grid. These regions are used to help understand how much greenhouse gases are produced by power plants in different parts of the country. Each subregion has a specific emission factor, which reflects the mix of energy sources used to generate electricity in that area. This factor aids in calculating and comparing the environmental impact of electricity production across different subregions.

Some subregions overlap with each other, but these regions are relatively stable and are updated very rarely. Therefore, you will most likely not need to update the eGrid subregion of your location throughout the years. Below you can see the map of eGrip subregions:

[Source: EPA]

The eGrid subregions are used in carbon accounting to accurately calculate grid electricity emissions for locations in the United States, as each eGrid subregion has its own unique emission factors relating to grid electricity consumption.

The eGrid subregion is set when a location in the United States is created. See the steps below for guidance on how to set the eGrid subregion for each of your US locations.

Step 1: Create new location

Navigate to the 'Company' section, and press the button '+ Add new location'

Step 2: Enter location details and postal code

The subregion is selected based on the postal code of your location. For example, a location with the postal code 00045 (Marion County in Florida) will automatically be assigned the eGrid subregion FRCC.

If your location is in an area where two eGrid subregions overlap, you need to choose the correct eGrid subregion manually. If you do not know which subregion your location belongs to, you can default to the US average.