I think you are confusing PoE (Power over Ethernet) with EoP (Ethernet over Power).
PoE: is an ethernet technology that uses the ethernet cabling to power small devices like APs, phones, cameras, etc. while providing an ethernet connection.
EoP: is using a pair (or more) of devices that plug into power outlets which you then connect ethernet cables to. This "extends" the ethernet cabling over the power cables in your house.
I know what you're thinking, but, "There ain't no gettin' offa this train!"