Your utility company subsidizes you. In the usual contract, you pay an price of 40 cent per kWh, no matter when you use it. But that price is based on a year-r

Your utility company subsidizes you. In the usual contract, you pay an price of 40 cent per kWh, no matter when you use it. But that price is based on a year-round average. Actually, sometimes electricity is super cheap for the utility company, like when the sun is shining in summer and electricity prices go negative. And sometimes it is very expensive, like on dark winter days without sun and wind, when prices are >1 EUR/kWh. What you can do with balcony solar is skip the cheap summer sun prices (which cost the utility nothing, but they still charge you 40ct), and you still buy at expensive times for 40ct, when it's actually worth much more.