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Flat-rate billing
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The flat-rate billing model is intended for systems using power control. It is based on the “Pauschalabrechnungsverfahren” (Pauschales Verfahren für Solaranlagen mit registrierender Leistungsmessung) from the German Federal Network Agency, but can be applied to any location, provided the system fulfills the prerequisites.
System factor
The model uses a fixed system factor that varies depending on the month of the year and time of the day. Find the system factors for different periods in the table below:
Period | Year period | Authorized period for curtailment calculations | System factor AF |
|---|---|---|---|
Summer | 01 Mar – 10 Oct | 7:00 PM – 6:00 AM 6:00 AM – 9:00 AM 9:00 AM – 3:00 PM 3:00 PM – 7:00 PM | 0.0000 0.2456 0.6189 0.2456 |
Winter | 01 Jan – 28/29 Feb and | 4:45 PM – 9:00 AM 9:00 AM – 10:00 AM 10:00 AM – 2:00 PM 2:00 PM – 4:45 PM | 0.0000 0.2796 0.5030 0.2796 |
Prerequisites
For the model to be selected, the following data must be available:
Relative active power setpoint value of any source.
Time stamps correspond to the table.
Flat-rate billing example
Formula
Flat-rate billing formula
Variable | Explanation |
|---|---|
WA,i | Curtailed energy during the 15-minute interval i in kWh |
AF | System factor: see table illustrating the defined period |
Pinst | Installed nominal power of the system in kW |
Plim,i | Setpoint value during the 15-minute interval in kW |