TLDR: All turbines on a electrical grid have to turn at the same speed. Hydro, Fossil fuels, Nuclear all use turbines. There is no way to dump energy into nothing to prevent the turbines from spinning too fast. So pure supply and demand capitalism is why we pay people to take our energy to allow our electrical devices to work.
I used to do work at a high security site. One day the fire department was there for inspection. Out of curiosity I asked the chief what happens if he needs access and he is declined it for whatever reason. He pointed at the truck and said “This truck along with it’s contents are the key to the city. Nobody can stop me”. That day I learned that nobody can stop the fire department.