The figures don't seem to work out for me there. If we assume 10k homes (so just one ten thousand) that's 1.6kW per home, which isn't much (in most countries a single socket can supply 3kW)
Yes, when I'm running my toaster or electric kettle or electric heater, my home may consume more, but I don't run those most of the time. There are even times when my home has almost no instantaneous electricity consumption.
https://www.enerdata.net/estore/energy-market/croatia/
With an average household size of 3.2 that's realistic.
Though imho it's a bit much. Pre-heatpump, our two person house drew less, even though I charge a PHEV. Maybe the figure includes industrial use?
Less industrialized than other parts of EU is surely a factor too.
I'm really curious what brought you to that conclusion.
Having little to no insight or direct experience. I cannot tell you how unbearable Istria and Dalamatia coasts can get in the Summer months without AC. And I've lived in Zagreb not far from the Slovenian border when we couldn't afford to turn on the radiator on for more then a few hours and it f'ing sucked. It made living in Germany almost comfortable by comparison--I lived near the French border and only had kachelofen to heat the home.
Croatian climate is incredibly diverse, its much like Californian climate in that respect; it has lots of islands where you may get away without AC or Heating, but that doesn't encompass the mainland. For such a tiny country it has a lot of diversity in terms of climate and culture for that matter.
I don't think this is the case in any modern household, as long as there is at least one device with a transformer (i.e. a "charger") plugged in. Of course, you can theoretically turn off all electricity, e.g. when going on holidays -- but most people don't do that, especially if they have any kind of smart devices or even an alarm system active.