Time to do maintenance on all of their other plants simultaneously. :^)
Shutting down all facilities for maintenance would be a fun catharsis moment for them - but I’m guessing they have numerous contracts requiring them to provide certain amount of power to various entities which would require them to purchase power on the open market. They’d pay dearly on the front end and if unable to provide contracted amounts of electricity they might have to pay penalties or fines on the back side of things. Welcome to government regulation, red tape and arbitrary application of the same.