Is that figure accurate? It’s so crazy low that it would lead me to expect the area to be saturated with aluminum smelting and other high electric consuming operations.
But those are very rare moments, and only last a couple of hours her and there. Not unique to Norway, but basically what happens is that there's huge amounts of downpour, coupled with little demand / usage - typically something you see in periods where people are away, and if the weather conditions are there.
I assume that everything is electric powered in homes in your area?
Apparently people in northern Norway got contracts for "normal" electricity. Due to the power grid and energy production the electrons there are however mostly from renewable energies.
Now here in Germany people have contracts with "renewable" electricity. This then works the way that German energy suppliers virtually buy the Norwegian renewables, while the Norwegians virtually buy the non-renewable from Germany.
Thus Germans think they pay for renewables and do something good, while Norwegians think "oh, all plants here are renewable all is fine" but in the end only the companies benefit.
The southern regions, however, have quite good transfer capacity to export (to European countries), so those regions often have to compete with export prices.
What this means, is that the prices can vary significantly withing Norway. While we up in northern Norway paid around $0.0005 / kWh last summer, my relatives south paid something like $0.3-$0.4 / kWh. It's been a pretty big deal for the past years.
Our energy production is almost purely hydro, with wind and solar as very distant second and third source. All our LNG is more or less sold off to Europe.