Owner-use is taken to mean covering household electricity requirements through self-produced electricity by means of a photovoltaic facility.
Example: if you have an annual consumption requirement of 3,500 kWh and can cover 60% of it through your photovoltaic facility, then you will save 2,100 kWh per year and 588 kg* of CO2-emissions. The 40% difference (=1,400 kWh) you feed as 100% green electricity into the public grid**, which means you pare down pollutants generally and receive money as a reward.
*1 kWh standard electricity (extracted from the grid, average emission factor for the Austrian grid mix) = 0,28 kg CO2; 1 kWh green electricity (taken from the electricity grid) = 0,03 kg CO2
**not possible in all regions/ countries.