Hi Karen,
The man who posted research on TWACS has a couple of engineering degrees. He is MCS/EHS and his research leads him to believe that TWACS "wired" metering is worse than wireless smart meters because a person might be able to shield or get far enough away from wireless meter signals, but TWACS infects the whole house by intentionallyinjecting RF into the 60 hertz power which turns all the wiring in the house and along the streets into giant radiating antennas. There really is no true opt-out with a power line communication metering system.
Dr. Olle Johansson recommends the website. It covers all smart meters, scroll down for PLC (power line communication meters) specific articles:
http://www.eiwellspring.org/smartmeter.html
Also, TWACS meters have transceivers inside which can be setup up to wirelessly communicate with nearby wireless gas or water meters and sending the data through the power lines to its destination.
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