So, sorry for my choice of words, I’m not a pro in the "house building area":
1. I mean "t"housand KW, the electricity meter only shows KW if I’m correctly informed (at least our digital one, the old one also had decimal places).
2. I am looking into photovoltaics, still thanks for the hint, maybe it helps others with the terminology (it’s all somehow colloquially "solar").
3. The electricity provider is the local supplier, who charges 18 Ct or 19 Ct for heat pump electricity depending on the contract, but I don’t think that will stay that way for long.
4. Yes, I haven’t found it yet on Check24 or Verivox as a comparison provider. But: I just checked and 6 of the first 7 providers here have the price below 20 Ct, disregarding the basic fee etc.
5. I find about 6000 KW (after deducting the hot water) as a heating value after almost 3 full winters not bad, especially since optimization was only done after the first winter and the screed was also partially dried with it, so that averages 2000 KW per year, I know some who have worse values.