Calculating CO2e savings
If you are calculating the estimated CO2e savings automatically, this topic provides a description of how these savings are calculated.
Estimated annual CO2e savings
Estimated Annual Unit
Savings value by a CO2e factor. The factor that is selected is based on these criteria:- The factor set that applies, for example, NGER, US eGRID, or IEA.
- The data type that is associated with the action, for example, kWh, natural gas, or diesel.
- The region that the location is in.
- Whether the finish date of the action falls within the effective dates of the emissions factor.
- The actual finish date of the action.
If an actual finish date is not provided, the planned finish date is used. If neither the actual or planned finish dates are provided, the factor criteria are applied and the most recent factor is selected.
For example, an action has an Estimated Annual Unit Savings value of 1000 kWh.
The action is associated with an Electricity [kWh] data type. The action has an actual finished date
of 31-Aug-2021. The action is also tied to a location in NSW Australia. The system identifies that
the default emission factor for NSW in Aug-2021 is 0.79 kg CO2e / kWh from the NGER factor set. The
estimated annual CO2e savings for the action are calculated as 0.79 kg CO2e / kWh *
1000 kWh = 790 kg CO2e.
Estimated annual energy savings
Estimated annual energy savings (GJ) is calculated by multiplying the Estimated Annual
Unit Savings value by a GJ conversion factor. If the automatic calculation of CO2e
calculation setting is enabled, the conversion factor is derived from the CO2e emission factor that
is allocated to the action.
The calculation of this field is based on the data type and the emission factor that is associated with the action.