ᐅ Foregoing the Use of Ground Source Heat?

Hello,

We would like to heat our new house (in Germany) using geothermal energy. The problem is that, according to the responsible regional geological authority, our property is located in a zone classified as level 4. In this area, geothermal use is only approved under exceptional circumstances.
Furthermore, according to the map, our soil is less suitable for geothermal collectors, rated as level 3.
The soil appears to me as very heavy and clayey. Under these conditions, should I reconsider the plan to use geothermal energy? Or would it be worthwhile to negotiate with the authorities and possibly invest more money in the installation of the collectors?

Moist, clayey soil has a relatively high heat extraction capacity, so the required collector area to cover the calculated heating load would advantageously be smaller than, for example, in sandy, dry soil.
Contact the state geology authority in writing to inquire under which exceptional conditions geothermal energy use would be approved – asking doesn’t cost anything.

I would also suggest asking first. You might find out that you won’t get an exemption permit anyway, so then the matter is settled. And if not, you can still decide later.

I would abandon this project. Why negotiate with the authorities and spend money if it doesn't lead anywhere? It's better to look for alternatives and invest there instead.

Spending money for no reason is something I wouldn’t do either, and if the local conditions don’t allow for its use, then that can’t be changed. There are definitely other alternatives.

Or consult a professional. I believe that sometimes negotiations can be effective, and if it’s worthwhile in the end, why not? But this is difficult to assess from a distance.