I'm with you. Given that flywheels are a relatively old tech, I've got to think there's a reason we don't do this. Maybe they require too much space or are too

I'm with you. Given that flywheels are a relatively old tech, I've got to think there's a reason we don't do this. Maybe they require too much space or are too dangerous? I'd like to hear from someone who knows something about the subject.