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It's still not earning you money to spend electricity because you still have to pay the transfer fee which is around 6 cents / kWh but it's pretty damn cheap nevertheless, mostly because of the excess in wind energy.
Last winter because of a mistake it dropped down to negative 50 cents / kWh for few hours, averaging negative 20 cents for the entire day. People were literally earning money by spending electricity. Some were running electric heaters outside in the middle of the winter.
So only energy losses in theory
If I had to guess, it's a temporary influx of "renewable" energy ( read solar nuclear energy as pretty much everything on earth including coal / water and so on ). You can't copy this into other countries. Both Scandinavian and alpine countries have abundance of water and wind energy
This also happened in Spain a few months ago, though. Which have drastically different climate and landscape to Scandinavian countries.
Maybe, but Spain has an huge sea shoreline. Sea breeze could be here an advantage for Spain
I would assume that most countries would have natural advantages to achieve this with renewable energy sources one way or the other.
As this has been achieved by very different countries around the world.
Welcome to the world of renewables. We have quite some negative hours in Germany in summer when sun and wind are active simultaneously. Unfortunately Finland relies on nuclear, does it?