Well, you could start to generate Hydrogen and replace natural gas, you could run desalination plants and waste treatment with all this "free" energy, just to not waste anything. This would reduce the impact of droughts because you could just use the energy you stored, or don't need to use energy because you already used it earlier.

As it stands, on sunny days I see 3/5 windmills standing still because the price on the energy bazaar is less than zero, so the utility companies would have to pay. Make it possible for people, facilities and companies to leverage that instead!

Run flywheels, charge batteries, generate hydrogen, desalinate and clean water and pump it up some hills, the possibilities are endless. They're just not doing it because reasons.