Negative electricity prices happen in Australia fairly regularly. The last time was just a few days ago: https://www.abc.net.au/news/11489188 Interesting

Negative electricity prices happen in Australia fairly regularly. The last time was just a few days ago: https://www.abc.net.au/news/11489188 Interestingly is isn't generally caused by renewables. It's caused by those "base load" generators: coal and if Australia had any, nuclear. Base load actually means "can't vary their output quickly". If you can't vary your output and you ramp down your output too early, you missing out on selling power. Too late, and the price plummets and have to sell it at loss - or worse pay someone to absorb the energy released by your boiler cooling down. But renewables have made this worse by unpredictably flooding the market with cheap power. They don't really care if the price drops to near zero as the wind and sun cost them nothing. But jeeze it must hurt to be selling electricity for less than it cost you to dig the coal out of the ground. I'm pretty sure that's one of the things driving the early retirement of coal and nuclear.