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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.
Does it ever make you want to turn on every appliance in the house just for the hell of it? Lol
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
It's simply supply exceeding demand. Finland has so much wind turbines that when it's summer time (no need for heating) and windy then the price drops to zero but then again in the winter time when it's cold and calm the opposite is true and we can see insane spikes in the price.
When you get energy that cheap you can always spin a few Bitcoin miners up. The rewards you get are rewards the other miners on fossil fuels won't get
A negative price is absurd and has no physical reality, it is the result of speculation and abstract rules not grounded on reality. It always costs to build and operate whatever power source and networks were involved, you don't have to pay electricity to f*ck off if you produce too much of it.
Sure, but if there is too much electricity on the net, things will start to break. That electricity has to go somewhere. No one wants to buy electricity because everyone is trying to get rid of their surplus.
About the negative, I don't know.
It's pretty common in the UK to get proper negative prices so it actually pays me to charge my car and run my AC. Octopus Agile tariff for example.