Recently we also got more and more smart meters here in Germany, as there are a few power companies that calculate your price by the hour. But that's not based on your maximum consumption but on the time of the consumption. If you use the solar and wind power on a windy summer day it's basically free, whereas the price goes up when it's expensive power from gas plants on a windless winter night. So you can lower your price by washing or charging your car at the right time.
That probably would not work that way in Norway as you have a lot of hydroelectric power which is available much more continuously, as far as I understand.
Every month is wild. Do the electricity prices change based on the season or why can't they just calculate the average over a year?