I wouldn't want to participate during emergencies, though. If a hurricane or a winter storm is coming, I want my car at 100% in case I need to evacuate, drive

I wouldn't want to participate during emergencies, though. If a hurricane or a winter storm is coming, I want my car at 100% in case I need to evacuate, drive around to get food, etc. On top of that, who knows when I'll be able to charge the car again. If we rely on cars to help stabilize the grid, it's not ideal that people will opt out just when it's needed the most.