We need a power line filter (it is actually or <power line cleaner> ) for houses using Home power line communication products.
This should only pass < 100Hz and filter all above.
This device shall be positioned between energy meter and home distribution.
This positioning won't disturb any power line communication used by smart grid (grid to smart energy meter communication)
Line filter in Home PLC
This gives two advantages:
1) your data won't go out of your house (even if you & your neighbor are connected to same grid)
2) your neighbor's data won't enter your house. so no interference with your PLC equipment, hence promised throughput (say order of 500Mbps depending on vendors)
Line Filter separating Home PLC networks and also from Smart Grid PLC
Above diagram shows Line FIlter separating Home PLC networks from each other, and also from SmartGrid PLC