You could get something like an iotawatt hooked up to your wifi with CT sensors on your mains breaker and get live readings of your power usage as well as "sens

You could get something like an iotawatt hooked up to your wifi with CT sensors on your mains breaker and get live readings of your power usage as well as "sense" when the power changes from Public to Diesel Gen. https://iotawatt.com/ https://iotawatt.com/