For the price of a car, a home becomes autonomous in electricity:
Pellet boiler - 10 000W - stirling engine to produce electricity - 4000kgs / year of pellets - exceptional efficiency 91%
Pellet boiler - with production of your electricity - Power: 10 Watts - 000 kgs pellets / year - Color: green Very high efficiency: 3%
Source: leboismassifisba-datcha.com
We are entering the era of decentralized electricity production.
In France, electricity production varies from 1kW to 3kW per dwelling depending on the time of year. If each of the 30M homes had such heating, there would be no need for power plants. It would only require a way to control the level of production from a distance for coordination.
This would of course be in addition to wind and photovoltaic production which would always have priority.