In calculating CO₂ savings, WIRCON GmbH attaches great importance to traceability and transparency. Calculations are based on a CO₂ avoidance of 500g per kWh. In general, CO₂ savings can be lower or higher, depending on the composition of the electricity. In general, CO₂ savings can be lower or higher, depending on the composition of the electricity.

Solar and wind energy are low in CO₂, whereas lignite and hard coal in particular are high in CO₂ emissions. Gas has yet another CO₂ balance. Germany and other European countries provide an electricity mix made up of different energy sources with different weightings. By supplying renewable energies such as wind and solar power, the CO₂ load decreases for every kilowatt hour consumed.

Based on the guide „Aktuelle Fakten zur Photovoltaik in Deutschland“ an avoidance of approx. 760 g CO₂/kWh is estimated for photovoltaic electricity (page 50). A low value of 500g CO₂ per kWh was deliberately used for the calculation. The CO₂ savings are therefore likely higher.