With a new photovoltaic system on the roof, homeowners can achieve a return of up to six percent in 2024. This is shown by a calculation by the consulting organization Zukunft Altbau. This has combined factors such as lower system prices, the permanent reduction in VAT to zero percent, rising electricity prices and therefore more lucrative self-consumption in relation to the slightly falling feed-in tariff.
This feed-in tariff will decrease again for new systems in the future. The degression of remuneration rates was stopped in mid-2022 in the wake of the energy crisis. From February 1, 2024, the remuneration for new, smaller house roof systems, which is valid for 20 years, will be reduced by one percent from 8.2 cents per kilowatt hour fed in to 8.11 cents. From August 1, 2024, the remuneration for new systems will be 8.03 cents, and from February 1, 2025 there will be 7.94 cents per kilowatt hour.
The feed-in tariff contributes to the lucrative operation of the photovoltaic system as it refinances the acquisition costs. “The cost per kilowatt hour generated for smaller rooftop systems is around eleven to 14 cents per kilowatt hour. Therefore, the feed-in tariff itself does not cover costs,” says Tina Schmidt from the Baden-Württemberg Photovoltaic Network. “The profit is generated by the self-consumption of solar power for the electrical devices in the household.”
It is extremely lucrative: a kilowatt hour of electricity from the grid currently costs between 35 and 40 cents on average with existing contracts. The kilowatt hour of solar power from the roof for smaller systems, on the other hand, is significantly cheaper at around twelve cents. Anyone who uses their own solar power saves 21 to 29 cents per kilowatt hour on this bill. As a rule, around a third of solar power can be used yourself without battery storage. With storage and electric cars it is on average well over half.
The exact costs for solar power from the roof result from the purchase costs of the system. Last year they rose sharply due to the energy price crisis, high demand and delivery problems. The upward price rally is now over and offers are becoming cheaper again. For rooftop systems with an installed capacity of ten kilowatts, the costs for each installed kilowatt hour have fallen from an average of around 1,800 euros to just 1,300 to 1,600 euros. Accordingly, the kilowatt hour of solar power becomes cheaper.
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