Heat pump is what I would have expected to be suitable for a setup like that. How big is the house I wonder.

First question should be: what latitude?

Because where I live around 55th this winter we had five straight weeks below -15c / 5f daily average plus enough snowfall that it was infeasible to clean anything but the most major roads.

Solar is out of question in these conditions and when thermal pump fails you have to evacuate. When just grid electricity fails you have to either have some sort of stored fuel backup or evacuate.

The article is typical handwavy crap which is popular among people living in what amounts to subtropics who can't even imagine how crazy they sound to most everyone else.