ᐅ Energy Efficiency Calculation with Photovoltaic System

I have a question about how the energy efficiency rating (energy consumption certificate) is calculated when you have a photovoltaic system. Is the total energy consumption simply reduced by the amount of self-generated solar power? So if I produce more electricity than I consume, would I automatically have the best efficiency rating? Or is the energy I still draw from the grid also taken into account? In the summer, I produce up to 10 times more, but in winter only about 70% extra (heat pump).

Thanks in advance!

In our energy certificate, it seems to be included only partially.
With our photovoltaic system, we generate about three times as much energy as we consume in total.

Nevertheless, the certificate does not show a negative consumption, but rather 5 kWh/m²a (0.46 kWh/sq ft/yr) or 10 kWh/m²a (0.93 kWh/sq ft/yr) primary energy demand.

That kind of makes sense. Is this an energy performance certificate?

@everyone else: Does anyone know how this is calculated?

No, it is a new building with an energy performance certificate.

Example 12345: Why the energy performance certificate is at best a rough guideline, but mostly confusing and unclear.

Consumption certificate: actual consumption averaged over the past 3 years (normal use, no vacancy, etc.) = no credit applied.

Demand certificate: According to §23 of the Building Energy Act in connection with §§21 and 22, “the crediting of electricity from renewable sources” is allowed. In summary, this means that electricity generated from solar panels can be partially credited, with slightly more credit possible if a battery is installed under certain conditions. However, this only reduces the primary energy demand.