I think there is some confusion among folks as to what a "smart" meter is.
A "smart" meter replaces the normal kind on the wall. They are not compulsory, I have had a faulty meter replaced this week with a normal one that doesn't allow the company to control my supply from their office, and is therefore not possible to "hack" by malicious people. They will be a five minute wonder for the geeky curious. They will not save you any energy. They can be a danger to older folk who obsess over the bills and may choose to turn off heating they need to stay healthy. Despite claiming to be free everyone will inevitably cover the cost in early and higher price rises since the company and it's shareholders don't want to be the losers.