[hacker_newz]

Nice write-up, I wish my apartment had this.

[Symbiote]

If the live and neutral cables of your electricity supply are seperate and accessible, you can buy a meter that measures power use with a clamp (loop) that fits around the live cable. Perfectly safe, they were often given away by electric companies in Britain in the 2010s to encourage thriftiness.

Here's a zigbee one: https://smarthomescene.com/reviews/tuya-zigbee-single-clamp-...

Here's one with an app: https://aeotec.com/products/aeotec-home-energy-meter/

You'll find many more if you search "clamp energy meter".