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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