Not.so.fast.
The electricity suppliers certainly has the right to know the meter readings at the beginning and end of each billing period, and at any time there is a change of tariff.
Which is about 12 readings a year, if you pay monthly.
AND NOTHING MORE
What makes you think the ANYONE is entitled to collect half-hourly information about your electricity usage, 24 hours a day, 365 days a year?
Under the specious argument about all that information being needed for "planning the grid" - which is in plain speak a plain lie and total BS.
As is most of the marketing spiel for these remote control and metering devices. It's not difficult to find very official documents about what is the real purpose of these meters that are accidentally also a remote switch to your supply. You could maybe take a look, instead of regurgitating the electricity companies' marketing spiel?
I happen to know few things about high voltage electricity grids. All the electricity supplier needs in order to plan production is the aggregated consumption by whole towns, at the most detailed by substations (serving hundreds of homes).
Half hourly information about someone's individual usage is of no use for planning. But it can nicely be sold.
Regarding "this is going to happen anyway", find the story about how identity cards got scrapped few years after the end of WW II. Might give you some ideas about things that "can't be done" - until they're done.
Another thing: you surely know that you can buy your own meter and have it installed by an approved electrician - in which case who owns the meter?