Cold local heat with ground source heat pump

Then you're out with your photovoltaic electricity. The energy supplier dictates the conditions.
So photovoltaic for self-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 either. You just pay 10€ more per month for external electricity (if at all).

Okay, thanks for now:
Is that really relatively little money?

One-time costs: €17,500
Energy price: 5.95 ct
Basic price, maintenance and 24/7 standby: €499.80 per year

This is how the principle works here... a heat meter is integrated behind the heat pump...! And we can get the household electricity from any company, then apparently the heat pump will run separately?!

I would say that you don't pay for the electricity for the heat pump at all, but instead for the heat generated.

Okay thanks first of all: Is that really relatively small money? One-time costs: 17,500€ Work price: 5.95ct Basic price, maintenance and 24/7 readiness: 499.80€ per year

That was before you posted the costs. I thought with the 17.5k the case was settled and afterwards you only have to pay for the electricity for the heat pump.

Work price: 5.95 ct

With a factor of 4, that would be 24 cents per kWh of electricity.

With a factor of 4, that would be 24 cents per kWh of electricity.

Where can I find out which factor is being applied?

Where can I find out what factor is applied there?

None at all. It depends on the heat pump, the heating design, and yourself. I simply assumed an annual performance factor of 4, which should definitely be achievable with geothermal energy. If the heating is well designed, 4.5-5 is also possible.
This means that you generate four kWh of heat from one kWh of electricity. If you even get five kWh from one kWh, the work price would correspond to an electricity price of 30 cents.

Paying for both, that is one kWh of electricity to operate and also the labor costs for four or even five kWh of heat, would be madness.