Your Renewable Energy Score is the percentage of electricity your home uses that comes from renewable energy sources. Renewable energy sources are naturally replenishing and produce no or low carbon emissions. These sources can include solar, wind, hydroelectric and biomass.

Your Carbon Free Score is the percentage of electricity your home uses that comes from carbon-free sources. In addition to renewable energy sources, this score can include nuclear energy sources.

Also known as “Carbon Intensity,” the Emissions Factor identifies the annual amount of carbon dioxide and other greenhouse gases released for every MWh of electricity Duke Energy delivers to the grid.

The generation mix identifies where your home's energy comes from each year. It shows the percentage of electricity from each fuel source that Duke Energy delivers to the grid from its power plants and purchased power. The generation mix provided is a “Residual Mix” as it also includes the net market impacts of environmental attributes such as renewable energy credits (RECs).

Also known as the “Carbon Footprint,” this is the amount of carbon dioxide and other greenhouse gases released for the year due to a your home’s consumption of electricity. This amount is calculated by multiplying your past twelve months of electricity usage, shown above in kWh, by the Emission Factor (EF) in lbs/MWh. Convert 1 MWh to 1,000 kWh. The Emission Factor is updated each year for the previous calendar year and reported each June to the Edison Electric Institute (EEI). We apply this single Emission Factor to your past twelve months of usage, even though the usage usually crosses over calendar years.

The carbon footprint calculation considers your home's billed electricity consumption. It doesn't consider home generation systems of any type. However, depending on your system configuration, the electricity you generate and consume directly on-site could reduce your billed electricity consumption and contribute to a lower carbon footprint. This is especially true when combined with other energy-efficient behaviors and upgrades.

CO₂e refers to carbon dioxide equivalent. In addition to carbon dioxide, other gases in the atmosphere such as methane, nitrous oxide, and hydrofluorocarbons have warming potential. Rather than report the emissions of each gas separately, CO₂e provides a convenient single metric that equates all greenhouse gas emissions to the impact of carbon dioxide.