This isn't that rare once large enough portion of production is wind/solar. Sometimes there just is "too much wind" and you get 0 or negative prices. For examp

This isn't that rare once large enough portion of production is wind/solar. Sometimes there just is "too much wind" and you get 0 or negative prices. For example today we got to -5c/kWh in Finland and it will be negative most of the day. Currently hydro is scaled down by ~1500MW and nuclear ~600MW. Also a bunch of wind is probably turned off due to the negative prices (there is enough wind today to almost max the total wind production of 3200MW today but only ~600MW in use at the moment) https://www.fingrid.fi/en/electricity-market/power-system/ https://www.fingrid.fi/en/electricity-market/power-system/ Though not all electricity is bought/sold on the spot market but instead a lot of consumers are on fixed rate contracts and the companies usually buy futures to cover most of the fixed price contracts they have. This is also why there is now a lot of investment in storage and hydrogen. Basically as more and more renewables (mostly wind here in Finland) is being built they want to buy this negative (or 0) price electricity and make money by selling it later. Though even negative electricity costs to use due to taxes (0.063c/kWh for industrial usage) and transmission fees (between 4 to 10c/kWh depending on location)