Power restored monitoring. Am I overcomplicating this?

Oh, I see. Can you use the Aeotec HEM then? It’s a Z wave device that reports directly to smartthings.

https://www.amazon.com/Aeotec-Aeon-Labs-ZW095-ZW095/dp/B00XD8WZX6

BTW, it’s on the official compatibility list, so you don’t have to use the custom DTH, it just gives you more features.

https://www.smartthings.com/products/aeotec-home-energy-meter-gen5-2p-200a