There were some small, low power AM radio stations that "transmitted" via power grid in mountain towns in North Carolina, a while back. I've been told that they

There were some small, low power AM radio stations that "transmitted" via power grid in mountain towns in North Carolina, a while back. I've been told that they had real trouble getting through transformers and they were using the main distribution lines and broadcast AM frequencies. That's with decent levels of power applied. I expect the incidental signals your usage generates are going to be hard to detect past your power meter and almost certainly un-resolvable past the distribution step down transformer.