You need to try harder Rick. 
I’m quite happy to bank with them and keep the money in my interest bearing account. They haven’t ever asked me to pay it off. 
My actual timings are night rate is 22:30 to 00:30 GMT & 02:30 to 07:30 GMT. All other times are on the day rate. The octopus app thinks my night rate is a single block from 00:30 to 07:30 so always reckons I’m using more “day” electricity than “night”.
That is because it thinks my 1st 2 hour block is day rate & that block is probably half, or more, of the consuption of the storage heaters.
I went back to a random day in December. So winter & lots of power going into the storage heaters, but before I was trying to do anything remotely clever. The second image shows the block (& very wrong costing as a result) that the Octopus app thinks is night rate.
Hi Rick
Bit confused by this - I think I need some more context. What do you mean by “actual”?. As I understand it the proper definition of E7 is 7 hours of discounted power from 00:30 to 07:30. Is what you are saying that the meter indicates a cheap rate from 22:30-00:30 and 02:30-07:30? Or are you saying that the Octo App disagrees with your monthly bills?
The only question I have come across elsewhere is not about the schedule - that everyone seems to agree on - but about how daylight saving time is treated. Some sources seem to indicate that SMETS2 meters don’t understand DST, so in summer the cheap hours run from 01:30 to 08:30. The contrary view is that what the meter says doesn’t matter because all the accounting is done by Kraken so energy consumed between 00:30 and 07:30 is charged at the lower rate irrespective of what the meter is saying
I have a fix ready built on the assumption that (a) E7 cheap period is 00:30 to 07:30 and (b) in summer it runs an hour late because of DST. Those assumptions can be changed, but I obviously can’t build a different schedule for every user. There must be a standard definition of what E7 means, somewhere…
Perhaps you could email hello@octopus.com and ask?
From The Octopus Website
Your smart meter will have a fixed off-peak 7 hour period from 00:30 to 07:30. This time period takes place according to Coordinated Universal Time (UTC), so during British Summer Time (BST) the 7 hour period will take place between 01:30 and 08:30.
Click the post title to view the page…
We’ve had E7, with various providers, since we moved into the property in 1983. In all that time,as far as I recall, we’ve had pretty much the same split period (22:30-00:30 & 02:30-07:30). We’ve been with Octopus since October 2021. I had read the link you posted &, when we had to have a new meter last year, as they were going to stop the radio control signal to the old one, I expected it to change to a single session. Nothing was said either way & it didn’t really bother me either way so it one of those things that just got left. I presume the meter must have had some input from Octopus to set the timing on the new meter.
The Octopus app assumes the 00:30-07:30 for its estimate of cost & just gives wildly inaccurate figures. I can confirm that the meter gets it right. When it shows the off peak only circuit is active all electricity from both circuits is charged off peak. I’ve checked the meter readings recently before the 1st slot (around 22:30) & after the 2nd (around 08:30) & total day rate consumption was 1 unit & 18 night rate. I was charging an EV, on a granny charger, timed to use both slots. So I would have known if I & the meter were disagreeing.
Maybe I’ll get round to checking with Octopus. It is only since Christmas that the timings have become more important (I got given an Amazon echo for Christmas & bought some cheap smart plugs). Then we got an EV…
Sounds like (a) I shall have to parameterize E7 settings in the Kraken app - that’s going to add sometime to delivery. (b) you need to switch to IOG… maybe…
Do your hours drift with DST?
Version 1.2.10 Usage Analysis
Version 1.2.10 went live at 08:30 this morning.
| Version | Status | Installs | Crashes | Crash Types | Comment |
|---|---|---|---|---|---|
| 1.2.10 | Live | 81 | 0 | 0 | Published live 2026-04-25 08:30 |
| 1.2.9 | Superseded | 2 | 0 | 0 | Published live 2026-04-22 20:40 |
| 1.2.5 | Superseded | 1 | 0 | 0 | |
| 1.2.4 | Superseded | 6 | 0 | 0 | Published 2026-03-31 16:30 |
| 1.2.3 | Superseded | 5 | 0 | 0 | Published live 2026-03-16 08:30 |
| 1.2.0 | Superseded | 2 | 0 | 0 | Published 2026-03-04 11:00 |
| 1.1.0 | Superseded | 5 | 999 | 1 | Defect upgrading from prior releases, resolved by deleting and re-adding any device |
| 1.0.39 | Superseded | 3 | 0 | 0 | Published 2026-01-11 17:25 |
| 1.0.38 | Superseded | 3 | 246 | 1 | Affected user upgraded |
| Totals | 108 | 1245 | 2 | Older versions all retired with 0 users |
217 Kraken Devices
Posted 2026-04-25 20:00
Making Day-Night And Three-Rate Tariffs Work
Thanks to @Rick_Heath who is the first Day/Night tariff user that I have come across. Not surprisingly, the app does not work very well with these multi-rate “simple” tariffs. Unlike tariffs such as Cost, Agile and IOG, Kraken does not publish Tariff Slots for simple tariffs - in fact there is no formally published information about when prices change for these tariffs.
Working with Rick I have created a work-around that should enable these tariffs fully within the Kraken app. This will be the main change published in the next test release later this weekend.
Unfortunately there is another wrinkle - it appears that not all customers accounts work to the standard timings. This must be quite unusual because it seems that even the Octopus App assumes the standard hours. So in addition to just getting it working, I need to implement a light-weight mechanism that will allow the standard hours to be overridden. That’s going to take a bit longer…
The good news is that any Day Night or Three Rate tariff customer who is on standard timings should start getting accurate information immediately. If you are not on standard hours consumption data will be accurate, but pricing and costing data will not be accurate.
Version 1.2.11 Published Test
Version 1.2.11 is now available as a test version. There should be no impact at all for users on standard tariffs and half-hourly tariffs. This release introduces basic support for Day/Night and Three-Rate tariffs (note Cosy Octopus has three rates, but is classed as a half-hourly tariff).
Installation
Users with non-impacted tariffs can simply install the new version.
Users with Day/Night and Three-Rate tariffs should follow this procedure:
- Delete your existing Import Tariff device
- Install the 1.2.11 Test release
- Create a new Import Tariff device
You should see that there are many more capabilities on the Import Tariff device and that, after a minute or so, all the capabilities are populated with data.
I have tested as thoroughly as I am able given the restrictions of the data available to me. But there is always the chance of errors in the new code. If you find problems with the new release, you can reinstall the current live version 1.2.10 from the Athom App Store.
Limitations
Version 1.2.11 imposes standard hours on all Day/Night and Three Rate tariff users. I am aware that some users have Economy 7 (for example) with non-standard hours. I intend to add that functionality in a forthcoming version.
Links
New Test Version 1.2.11
Current Live Version 1.2.10
