The price was about 0,37 €/kWh for 2021.
Now I made a price calculation for a yearly 5.000 kWh in different cities in Germany (2023 prices).
Berlin : 2.583,30 € -> 0,52 €/kWh
Hamburg: 2.619,30 € -> 0,52 €/kWh
Frankfurt: 3.538,49 € -> 0,71 €/kWh
München: 3.592,37 € -> 0,72 €/kWh...