Unexplained half-hourly usage pattern

Very odd. Could you post a screenshot of two of where you are seeing this please? Is this for gas or electricity?

Are you perhaps looking at the gas only readings, with a gas central heating boiler timer set to be OFF between midnight and 7am?

My gas CH is set to be off between 22.00 and 07.00 so my gas usage has zero half hourly readings between those times. (Unless I run a hot tap during the night, it's a combi-boiler, so such as below where I ran a hot tap beteween 6.30 and 07.00).

Good morning ​@rogerp64 and welcome to the community, I hope you’re doing well.

Thanks for your post - this is a strange one indeed. I’m hoping that, as ​@Nukecad suggests, that it might be the gas usage displayed on the app - easily done. This guide gives some good info on all aspects of the ‘Usage’ pages:

If this isn’t the case, and the electricity usage is displaying zero usage between midnight and 7am, this could point to the meter being set up incorrectly, or just a technical error with the app / online account. Please could you check the browser online account portal, and let us know whether the issue is the same there?

We look forward to hearing back from you.

Thank you for your suggestions. 
Mum doesn't have gas, but the suggestion about the water heater is likely the explanation.

I will make sure the (electric) water heater is turned off and track usage. Heating up the entire tank must take a whack of power… 

​@rogerp64 something definitely seems wrong here. If you could provide screenshots of the ‘Usage’ pages that’d be helpful. 

Thank you ​@Ben_OVO 

water heater is turned off. So it’s not that causing the spikes. 
 

here are two images from separate days in the past week. 
 

Those are revealing images - thank you.

They show something like a 3kW heater starting at 7 each morning, and again at around 7.30 in the evening, on top of other activities like cooking and watching television. How is the house heated? If there are storage heaters, you would expect to see them charging up overnight - e.g. from midnight - with the sort of pattern you see from 7 am. The evening spikes could then be supplementary heating of some sort, either separate panel heaters or (for some modern storage heaters) an inbuilt fan heater (referred to as ‘boosting’ or  ‘balancing’ when there isn’t enough stored heat left to maintain the temperature at the desired level). 

This does look like some sort of wiring fault, as if appliances have been connected to the wrong circuit. Things like fridges and freezers operate round the clock, and something’s seriously wrong if they aren’t running at all overnight. 

You may have to get a competent electrician in to check things over. We might have some suggestions to make if you could post some photos of the electric supply, ideally:

• a close-up of the meter itself (with the display lit up by touching a button if necessary) clear enough to be able to read the display and the markings on the meter itself;
• A view of the whole backboard so we can see the main supply cable coming in from outside, and all the cables to and from the meter itself;
• A view of each consumer unit (fuse box) clear enough to be able to read any labels the electrician may have left to say which breaker is which.

This may help us to get to the bottom of the problem and make it possible to suggest a remedy.

​@Firedog thank you for this. 
 

I’ll aim to get those pics as soon as I can. 
My Mums house has no active heating.

She runs a couple of fan heaters when needed and rugs up (big time) (and these fan heaters are running in the hours that are showing as nil use (Mums a night owl)

Thanks ​@rogerp64, we’ll await your photos as helpfully requested by ​@Firedog. I’m hoping that there’s something wrong with the usage graphs on our side, rather than with the supply at her home. Whatever the case we’ll help you get to the bottom of it.

Thank you ​@Ben_OVO   I spent an hour on the phone explaining that my mother lives on her own and uses only small devices. No oven, no hot water. Fans, microwave, kettle. 
 

the consistent message was that we don’t know what she uses at home. No. However I do… and is 13000KWH what would be considered normal for a Years use !!