I may have a solution for you if you have parallel 220v GFIC outlet that you can plugged in phone charger. Most phone that are sold internationally in the past 10 years probably come with 100 to 220Volt charger.
I made my own Zigbee Environment Sensor. It is expandable. At one point, I make power monitoring expansion board.
You just need to plugged in the environment sensor to the phone charger. Then, the power charger to the parallel GIFC outlet. My device comes with battery backup capability. If you plugged in a LIPO battery, when your GFIC outlet tripped, the device will still run for a few hours. At that point when it tripped, It will also tell the hub that the outlet is off. You can do the rest based on your rule.
If you think something like this would work for your need, feel free to PM me.
Thanks
Iman
