Not sure why you say this. I'm on solar + batteries 24/7 365 days a year. Use no fossil fuels. Even had utility company remove power poles from my place.
Probably pretty doable in Europe. For one most people don't have air conditioning and that's a big suck of electricity. And if you aren't using electric for heat then realistically your electric draw is not going to be that high
Heating generally uses much more energy than cooling, and even more so if something is burned.
However, it's true that places with low heat pump adoption tend to have few ACs. For example, ACs are rarer in Germany than in Norway, despite Germany being warmer.