I’m a volunteer for a small village hall, and I wanted to share how we've been using the glowmarket api, and say thanks to all who have unknowingly contributed.

We rent the hall to a number of user groups and private users, and charge them for their hourly usage of the hall plus electric used. Since we have electric heating this is the larger part of the bill in the winter months. ​Before this, we were still using a paper diary for bookings and asking users to manually record meter readings on a sheet of paper, for our treasurer to reconcile monthly.

​I’m not a developer by trade; I’ve relied almost entirely on "vibe coding" to cobble this together. a Google Apps Scripts that connects the Glowmarkt API to our Google Calendar. It pulls our 30-minute readings nightly and attributes the energy usage to specific bookings. It then populates a dashboard so we can make some analysis of where usage has been attributed, or not and helps inform our billing as well as check for usage outside of bookings.

​It’s been working for us for the last 6 months or so, so I’ve shared a limited version of the code on github here:

https://github.com/BasslineSurvey/HallEnergyDashboard/

in case it helps another volunteer out there.

I'm very keen for suggested improvements or any feedback from the more technically minded folks here on how to make it more robust. Or suggested improvements particularly in making any assessment of energy efficiency performance.

​Huge thanks to the Glowmarkt team for the API and associated guides and to the community here for the previous discussions that made this possible!

We have a limited amount of stock of our Wired CADs available again - in case you are interested - these are the last of the device we first launched back in 2014! (The first CAD in the UK - launched before the DCC was available - joining the unit to the meters was only possible with Secure Meters in those days).

This is probably the last device we will do with an ethernet port as there hasn't been demand to justify future production.

I have some bash scripts which tirelessly read my energy consumption using the API at https://api.glowmarkt.com

I realised that I hadn't checked my graphs for a while and then found that I have no data since about 2025-10-02. In fact my API queries get the to date squashed to 2025-10-01T23:59:59

I also note that my Android "Bright" app has stopped working too. Looking at your forums, it's clear that something went wrong around that time but appears to have been fixed for most users. Any advice would be welcome.

Apologies if I'm asking in completely the wrong place ...

I have had it plugged in for days close to the electric meter but unit still says finding your smart meter and won’t work!

i have e mailed customer support but still not working

can anyone help?

ta

matt

Until recently, the meter was recording what I expected: use only during Economy 7 periods (ie midnight to 7.30). However, 3 days ago, it started reporting zero use for all half hour slots. A neighbour confirmed for me that the heaters were drawing power.

Is it common for this sort of fail to occur (ie electricity is being used, but not captured by the meter) It clearly undermines the trustworthiness of smart meters?

It was working on 5th Jan but I changed tariff on the 6th, since then GLowmarkt has not seen this change. Although the Bright app has latest consumption is still shows the old tariff.

remove the spaces

https:// octopus.energy/ octopus-home-mini-faq/#ohmsetup

Spends a long time getting Meter ID:

Thereafter First Data read: is not available - shows Refresh data forever, pressing it gives Sorry - we weren't able to refresh your data resources.

I have tried for more than a week. Bright app shows recent data

This will have two consequences.

1) the overnight scheduled read will be delayed by the DCC until late rin the day to allow the network to be used for sending the price changes to the meters. This is particularly important for prepay and the DCC target these meters first.

2) If you are a user of our DCC only data service you will know that we do a 'catchup' during the day if you look at Bright or use the catchup api call - this process will be suspended until Jan 2 to reduce the load on the DCC network.

After several years of flagging this challenge, we've now been told how to do a remote 'workaround' and can successfully 'clean and restore' your Glow CAD. Contact support to trigger the process.

Please note that this does NOT apply if you have a SMETS1 variant of our CAD and your meters are replaced with SMETS2 meters; that definitely requires a new certificate on the unit which has to be returned to us to do the work and entails a small fee.

We’ve just launched our first ever discount promo on our shop: 10% off when you purchase our Glow Display CAD and Temperature/Humidity Sensor together! Offer ends midnight on 30 November.

Most of you here probably already have a Glow CAD, no doubt embedded into your Home Assistant set ups and running automations we'd like to hear about, so this isn’t really a ‘go buy more’ announcement.

What would be great is if you could help us spread the word to people who might be interested.

If you’re active in other smart-home forums, Home Assistant subreddits or energy-monitoring groups - sharing the promo would really help!

Boosting sales helps us fund new features in Bright and future hardware improvements - basically it helps us continue to create more cool stuff (and we've already got some exciting things ahead in our product roadmap! but don't write and ask what they are, we'll tell you here :) )

The shop url is https://shop.glowmarkt.com/ and the discount code is AUTUMNBUNDLE10. Thank you for all of your support!

P.S If you've already got our display/CAD and have been debating adding temperature/humidity sensor(s) - keep an eye on your inboxes  😉

The next thing I would like to do is show the data from in Home Assistant (which I am also new to), can anyone tell me how to do this?

I hope everyone is well.

I am considering buying the temperature and humidity sensor as per: https://shop.glowmarkt.com/products/sensors

Can anyone provide info / pics on these units?

Do we have a separate thread for them?

Thanks & 73,

KMAC.

MM7LSD

For those who haven't signed up to our Systems Incident alert facility, please be aware of the above. People using Local MQTT will be fine.

Here is the Incident area of the glowforhomes.com site: https://glowforhomes.com/support/system-incidents?incidentTimeline=upcoming

Have a good weekend!

In the UK, Herefordshire. We have had a few power outages recently, but not associated with the above time.

John Cooper

How do I download my usage data. Its a SMETS 2 meter. I seem to have it registered ok with glow etc, but no data is showing.

Does it take a few days to load onto the glow system?

Thanks

We are getting more active on social media - from Linked in for our Hildebrand site through to Instagram. 

In case you are interested, here are the services and their related social channels and/or web sites:

https://linktr.ee/glownetzero

The overarching web site for all our market facing products and services (domestic and non-domestic) supported by the Glow platform will be Glow net zero.

We are keen to follow people doing interesting things around energy efficiency and getting to net zero on Instagram - drop a note to us @glownetzero and we'll follow you.

By the way, what is currently our domestic consumers' site Glowmarkt is going to be relaunched as Glow for homes (the url glowforhomes.com is already in place).

Thanks for your time,

Jane

(apologies for the re-post, I should have tagged this as an Announcement!)

We are getting more active on social media - from Linked in for our Hildebrand site through to Instagram.

In case you are interested, here are the services and their related social channels and/or web sites:

https://linktr.ee/glownetzero

The overarching web site for all our market facing products and services (domestic and non-domestic) supported by the Glow platform will be Glow net zero.

We are keen to follow people doing interesting things around energy efficiency and getting to net zero on Instagram - drop a note to us @glownetzero and we'll follow you.

By the way, what is currently our domestic consumers' site Glowmarkt is going to be relaunched as Glow for homes (the url glowforhomes.com is already in place).

Thanks for your time,

Jane

This seems to get sorted by the next day, but is a consistent issue - which is probably why my supplier (EOn) don't update the usage data in their app for a couple of days, when it becomes complete.

I can't believe that it's a fault with the Bright/Glow readover (why would they pull the current day's readings but miss some of the previous day's), so I suspect it's more to do with some problem at the DCC end

• The readings from the meter seem to get read around midnight for the previous day, then read again in the morning (maybe?)
• However the data is often missing several of the ½ hourly readings for the previous day (This shows on Bright which displays everything)
• Sometimes readings for the current day are present, but some still missing for the previous day
• It's only later in the day that the previous day's readings may get correctly populated
• So by day 2 hopefully everything is there

I've documented this in more detail on the EOn customer forum here

https://community.eonnext.com/threads/9818-EOn-app-2-day-data-lag?p=59218&viewfull=1#post59218

In case anyone else is interested in using or improving it, please find it here:

https://github.com/hgomersall/Battery-Energy-Sim

Essentially, you can load CSV smart meter data exported from glowmarkt, add a battery, and add and adjust the tariffs to see what the impact would have been over that period on your electricity spend.

Current limitations that should be easy to fix are: (1) the raw data always uses the default price; (2) the charge rate is fixed at 3kW, the discharge rate is unbounded.

Less simple things to fix are (1) there is no facility for including solar; (2) I'd like to include gas data alongside historic temperature data and CoP data to estimate the effect of using a heat pump to replace the gas heating.