What I wanna know is if I could/should have a plug-in box that detects the frequency is drifting and the grid is unstable —-> high risk of imminent failure.
Might even give you clues about something big tripping offline.
Probably lots of false alarms, but if it an outage is particularly bad for you, good to know as soon as the system operators do.
Obviously over the internet could work too, but who wouldn’t love their own box?