Earlier quoted context omitted.
That sounds good and altruistic... ... for the high income techies that make most of the HN audience. Ask a normal person how they feel about paying for the heat pumps and having an extra hundred or two on their ongoing heating bill and you may get a different answer. Up to and including them not being able to cut expenses anywhere else to compensate for this.
You can DIY an usable solar setup, complete with battery, for a couple thousand euros, panels and inverters are already quite cheap and the battery prices is coming down. If you have the space to put it, you can be self-sufficient for most of the year. Equipment is VAT-free in Germany and Austria, too. The big problem with solar, is that winter days are cold and dark, so when you need heating the most, it's the least…
High income people living in detached houses again...