Cold local heat with ground source heat pump

So the operator of the ring main network should be able to prohibit supplying their own heat pump with their own electricity (that's what this is all about, right)? It seems to me that generated heat from the heat pump (powered by own electricity) flows back into the ring main? Then the operator claims that Renewable Energy Act surcharge would be incurred? But he is mistaken, it applies exclusively to electricity, definitely not to heat.

Are there publicly accessible documents about the project? Please do not provide a link, just describe where the documents can be found.

The "background noise" of the heat pump ensures a high degree of self-consumption even WITHOUT a battery, which makes photovoltaics significantly more efficient (from a commercial perspective). Battery? The discussion is old and actually the summary is: not (yet) financially worthwhile (ecologically at least questionable). My future BEV has a 63 kWh battery and costs (including the car around it) 40K gross, my 4 kWh photovoltaics battery costs .... 3200€ net ...

So the operator of the ring main network (after all, that’s what this is about - right?) should be able to prohibit supplying the own heat pump with own electricity? It seems to me that the heat generated by the (own) heat pump powered by (own?) electricity flows back into the ring main? Then the operator claims that the Renewable Energy Sources Act surcharge would apply? But he is mistaken about that, it does not apply

The constellation as I know it:
Heat pump owned by the network operator. Network not a ring main, but supply and return flow, i.e. tree topology. Supply comes with a "higher" temperature, the heat pump draws energy and sends the lower temperature supply back to the primary side producer. If the operator now purchases photovoltaic electricity from the customer, the Renewable Energy Sources Act surcharge applies to that (according to my layman’s understanding).

Who owns the heat pump? Supplier or customer?

That's the issue ... so in the contract, under one point, it states that the heat pump remains the property of the energy provider and is only a notional component of the house.

Under the item connection costs, it says that we have to pay a one-time fee of €17,400 and with that the installation of the house connection, the heat pump system as well as all other materials and expenses necessary for the production of heating and cooling supply within the meaning of the contract up to the heat meter behind the heat pump are covered!
How do you especially understand the last part? ‍♂️

Does the heat pump necessarily get its own meter / tariff with you? Because there has to be a complete separation of household electricity and heat pump electricity.

Well, I was told on the phone that I can also get household electricity from somewhere else! Then it should be like that, right?

What a coincidence - we just had an info session about this development area with this technology ;) I guess I know where you’re building...

So the supplier can forbid you from powering the heat pump with your own electricity, because that would make it unprofitable for them. Somehow they have to recoup the enormous costs of building the system. They have to be able to count at least on the electricity for the heat pumps.
What they can’t forbid you to do, however, is to use photovoltaic electricity for the "normal" consumption in the house. So photovoltaic is worthwhile after all.
Do you want a battery with it?

Okay then guess where we want to build!! I can well imagine the costs you mentioned, but we already pay a one-time fee of €17,400 as described above, then €500 annually for maintenance, repairs, and warranty, and then the operational price of the heat pump at 5.95 cents! It would almost be more economical to drill on my own property... then I would be the owner and would of course also have ongoing costs but no dependencies on the energy supplier, right?

That's the thing ... so in the contract it states under one point that the heat pump remains the property of the energy supplier and is only a notional component of the house.

Then you are out with your photovoltaic electricity. The energy supplier dictates the conditions. So photovoltaic for own consumption (household) is possible, but not for the heat pump. So what. For relatively little money you then get a geothermal heating system. Be happy about that. P.S. With the photovoltaic electricity and the heat pump you wouldn't have made much money anyway. You just pay 10€ more per month for external electricity (if at all).