My house is similar to that of your grandparents. The house was built 70 years ago, and originally it had a coal fueld boiler, which was switched to a heating oil boiler (twice, I think) with the one in place when I bought it also having a 6KW electrical backup coil.
In 2020 my country (Norway) made it illegal to use fossil fuels for heating, so I had to upgrade my grid connection and buy a couple of space heaters to account for the days where 6kW is not enough.
At the time (2020), electricity was still very cheap here, due to Norway being self supplied with almost-free hydropower. Now that we're able to export all our surplus electricity (and then some), and we're seeing German electricity prices here, I suppose I need to get a heat pump.
TLDR; Given a couple of decades, it's perfectly possible to move the population away from fossil fuel heating IF you have large amounts of affordable electricity.
In 2020 my country (Norway) made it illegal to use fossil fuels for heating, so I had to upgrade my grid connection and buy a couple of space heaters to account for the days where 6kW is not enough.
At the time (2020), electricity was still very cheap here, due to Norway being self supplied with almost-free hydropower. Now that we're able to export all our surplus electricity (and then some), and we're seeing German electricity prices here, I suppose I need to get a heat pump.
TLDR; Given a couple of decades, it's perfectly possible to move the population away from fossil fuel heating IF you have large amounts of affordable electricity.