Method 1
For a complete overview of electricity consumption, it's best to create three types of gauges: you can create these three gauges using the gauge templates under the electricity function group: the first "standard" type reports the use of purchased electricity, usually obtained from the energy supplier's invoice(s).
On the second type of gauge, you enter the total amount of self-generated (solar) electricity as indicated on the inverter meter, and in the third type, you enter the (negative) value of the amount of electricity fed back into the system. The sum of these three gauge types then gives the company's total electricity consumption (purchased plus total self-generated minus fed back into the system).
Adding the total CO2 emissions (market and location-based), energy consumption, and total electricity consumption this way will always yield a good result.
For companies certified for the CO2 Performance Ladder, the fed back electricity can be reported as avoided CO2 emissions. This can be combined with other emissions labeled as avoided emissions.
Method 2
A second option is to use two measurements. One gauge that registers "self-generated and consumed"—that is, the self-consumed portion of what has been generated—and one gauge that records the amount fed back into the grid. The CO2 calculation will then also be correct, because the fed-in electricity is calculated at zero emissions.
Remember that when calculating energy or adding up all electricity, negative values for the fed-in electricity can lead to an incorrect result. Therefore, the fed-in electricity should be filtered out when creating such graphs and tables so that it is not counted as "consumed."
We recommend using method 1 in most cases.
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