ᐅ Is it possible to sell self-generated electricity to tenants in a multi-family building?
Created on: 14 Oct 2025 20:44
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Heidi1965
I own a house built in 1994 with four rented apartments. So far, heating has been provided by individual gas boilers. Now, I want to add insulation, install a photovoltaic system, and switch to a heat pump. An energy consultant has prepared everything. Only now have I understood that the electricity generated by the photovoltaic system can only be used to operate the heat pump. Any electricity not needed by the heat pump (in summer) must be fed back into the grid for 8 cents per kWh. Until now, I thought I could also sell this surplus electricity to the tenants – for example, at 15 or 20 cents per kWh. That would seem like a win/win situation. However, the tenants keep their own electricity meters and continue to purchase their household electricity from their own suppliers.
I am concerned that, in the end, a lot of electricity will be fed back to the grid at a low rate, since the main electricity production is in summer, when the heat pump is needed the least (only for hot water). Or is there another solution?
I am concerned that, in the end, a lot of electricity will be fed back to the grid at a low rate, since the main electricity production is in summer, when the heat pump is needed the least (only for hot water). Or is there another solution?
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Jesse Custer17 Oct 2025 09:56Heidi1965 schrieb:
It may be that next year there will be no revenue at all from feed-in.Caution: existing use rights.
Regarding the other points: none of the options—leave everything as it is. At most option A—but even then, you need to be aware that you might cause potential issues with colleagues who are not careful with ventilation...
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Heidi196517 Oct 2025 10:23Can I rely on the gas supply continuing? I am conflicted. On one hand, I want to upgrade the house, but on the other, I worry it could bring many issues I haven’t faced before. For the heat pump system, a frost-free space would need to be created in the attic, and numerous pipes would have to be installed throughout the house. Instead of chimney sweep costs every two years, I would have annual heat pump maintenance. As a landlord, I don’t think I’ll ever get the same comfort I had with gas boilers that lasted over 30 years. Or is that a short-sighted view?
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Heidi196517 Oct 2025 11:38The insulation is also included, as well as an additional 12 m² (130 ft²) space to be created in the attic for the internal technical installations. However, the offer from the heating contractor still needs to be negotiated.
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Heidi196517 Oct 2025 12:15It concerns the insulation of the exterior walls. I planned to have this done anyway. The current standard dates back to 1994.
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