Mandatory heating rental in new buildings - is that possible?

The amounts seem too high to me for that

Most municipal utilities have to cross-subsidize other things (public transport, swimming pools...) with the revenues from energy sales and network charges, and not just a little. If there are any profits left at all, they go to the shareholders, usually the respective municipality/city.

Yes, I know that well and I can imagine how one comes to that conclusion, but I consider it wrong. Taxes or fees are there for the other things.

Additional info.

No, the costs do not include the entire development costs. They exclusively cover the cost contribution for the installation of the geothermal collectors (20k€) and the connection to the network of these collectors in the residential area (5k€).

The system technology is provided at the costs stated in the first post. As mentioned, for the pure 25k€ to be able to participate in this heat supply at all, you could equip an entire single-family house with complete heating and hot water technology including underfloor heating on all floors. I mean completely. Of course, the pure costs for heat are then certainly somewhat higher in comparison. But hey, I currently live in a house with KFW 55 standard and an air-water heat pump. Heat (heating and hot water) cost me around 900€ per year with 4 people in the household (2 adults, 2 small children). In the possible new home, it would be significantly more in the next 15 years, but significantly. After that as well, actually. I just can't get behind the concept, where the advantages for me lie apart from handing over responsibility for my heating, which for me personally is more of a disadvantage to become so dependent. Right now, I only see advantages for the local utility company.

Oh, I forgot, that was also a question here. The heating costs of currently ~ 8 cents / kwh are not fixed for the duration...

With the additional information, nothing changes about the problem that you have no choice. Either you take the property with the [Nahwärmezwang] or you leave it. It's annoying, but there's nothing we can do about it.

The additional information does not change the problem that you have no choice. Either you take the property with the compulsory local heating or you leave it. It’s annoying, but there’s nothing we can do about it.

I definitely won’t do it, but I still find it interesting to exchange views on such serious topics.
It may be that for some it is such a digital decision. For some, it is certainly the case that they put their own desire for a house above everything else and practically let themselves be “fooled” wherever possible just to live in their own house. Everyone has their reasons.
At least for me, it was important to talk about it.