Re: But if its a smart meter
"Minute by minute billing isn't going to happen. Half-hourly is the highest frequency, and currently only for high rollers"
Maybe billing that way isn't going to happen for end users at home/office/whatever.
But the miracle of 'market forces' has already created niches for aggregators who can 'demand manage' their end users loads on a minute by minute basis, and the aggregators can be paid for doing so, in the guise of 'balancing services'.
Vcharge, the US company which was bought by Ovo (them again) a couple of years ago, was an early example of such a demand management/aggregation operation, there had been others previously..