Hi, I love your Sonoff devices!
IFTTT scene currently triggers only 2 things: temperature/humidity and state of another device.
Please add triggers to the POW device; that monitoring power max (Watts), voltage (volts), and current (amps).
Anyway load shedding detection devices cost a lot of $$$ and not at consumer prices. A simple update you will be able to sell (you will be cornering the market ;)) more of these as you can say it "pseudo" load shedding capability" by turning off devices to save power.
Hope to see it on next update :)