[abosherid]

Are the electric readings sent in plaintext or trivially decrypted?

[mh-]

Unencrypted, I'm sure.

I hadn't thought to look for smart meters, but my RTL-SDR (and my Flipper Zero) can pick up all sorts of temperature sensors, etc.

A quick google found this rtlamr project with a number of blog posts about people doing this with it.

https://github.com/bemasher/rtlamr