Some key insights from the article:
Basically, what they did was to look at how much batteries would be needed in a given area to provide constant power supply at least 97% of the time, and the calculate the costs of that solar+battery setup compared to coal and nuclear.
I've got solar with net metering. But apparently I leave in a much gentler environment still, compared to you. Got a small house (<150sqm), winters reach -20°C and have sustained -10°C for multiple weeks and yet the bill hasn't reached past 1400€/mo before solar panels. Everything in the house is runs on electricity.