If you have a electrical meter that is on this list: https://github.com/bemasher/rtlamr/blob/2335efc36f55fdc0733de73049d494654f7f1956/meters.csv .
And you have some python knowledge. I recommend this :
Get your smart electric, water and gas meter scm readings into home assistant with a RTL-SDR
All it requires is a supported elec.meter and a $25-$50 usb dongle.