30mins is still pretty useless if you want to track device energy, like my hob/oven, and .. take back control, like the smart meter adds promise
I thought the likes of octopus (maybe you have to email them) were already offering less than a minute option which Consumer Access Devices can exploit
You seem somewhat confused
The meter readings are that frequent, the IHD is basically real time (updates every few seconds)
So on(for example) BGs website i can see my energy usage in half hourly uploads, which means I can see 48 slots per day. Its quite consistent in broadly matching up to when I would expect my usage to be displayed. But it also gives the grid more knowledge on baseloads, peaks as more and more make this info available
I wouldnt want to have to be using some web portal to try to understand my energy usage at some point after its uploaded.
The IHD is what you want seeing as you can just plug it in by the thing your wanting to watch, or just carry it around if you are so inclined
For example I can go downstairs now, turn on my kettle and within a few seconds the IHD will show a jump of approx 3kwh. No surprise there. Do I really need to have that permanently available by the minute via the web so I can check in 3 days time whether it was 9:29 or 9:30 that I boiled my kettle?
There is no magic bullet here, if you really really want to know an individual items usage you need to get a plug in meter for those you can, and / or turn everything else off and use an IHD.
I suppose eventually energy may be so expensive that seeing the cost by minute may be beneficial, but right now seeing it by the minute is frankly irrelevant.
Maybe when we start getting charged in 30 minute slices being able to see it by the minute may allow you to turn things on and off with that granularity
When its by the minute you can turn your cooker on and off every 1 minute to get the best prices. Lol!