BS. It is not an invasion is you consent to it.
A private contract for a specific pricing schedule for cheap electric service is NOT the same as the police collecting evidence on you for a criminal case.
If you are a free man, you can disconnect your electric service, get gas appliances and heat and run your lights off of solar/batts.
But 21st century Americans are such coddled candy asses that they think all their luxuries (which didn't even exist for the founders) should be given to them for free.
High speed internet service has been deemed a basic human right!
That being the case, it goes without saying that 'smart' utiltiy meters are unconstitutional...
; - )