On Sun, 10 Jun 2018 11:04:47 +0100, Max Demian wrote:

They are supposed to be able to charge different rates at different
times, but it's not clear how they do this. To do it as you suggest, it
would have to sent back the usage hour by hour, and possibly minute by
minute -

You can opt for a smart meter to send readings every 30 mins.

--
Cheers
Dave.