It’s not how all businesses work. Many businesses lower prices when there is a surplus. Consider filling up at the gas station for example.
It’s ridiculous that energy prices would go up when they are spending less on natural gas, coal, or whatever they are using to create the power.
Honestly crap like this is just going to encourage those that can afford it to install solar panels and backup batteries to load up on cheap electricity. Then the power company is really going to throw a hissy.
And? That cost is constant. It shouldn’t cause fluctuations in price.