Trying to register with a third party to access my usage data, but struggling to enter MAC address?

Hiya!

It’s not the MAC Address you want - it’s the GUID which is longer. :)

Which third party? There are people here who have tried most of them and can probably suggest what’s going wrong.

There is a utility which retrieves the OVO data from the account website, which may be good enough for you. The website is usually up to 24 hours behind, so this isn’t much use if you’re looking for close to real-time data. It’s here: https://github.com/MikeWilliams-UK/My-Ovo-Data/releases/tag/V1.0.9 

OVO have no interest in helping with accessing usage data via third-party utilities. 

It’s also worth mentioning that it’s not so much OVO refusing to help with this one, and more of a case that they can’t help with it as OVO has no access to third-party systems such as whoever you were trying to connect to. DCC User Roles prevent OVO from touching that as third parties come under DCC Other User while OVO is DCC Supplier if memory serves.

Responsibility for support lies with the third party in this case.

​@ObsidianWalker have you had any luck entering the GUID number as per ​@Blastoise186’s advice?

The GUID is a 16 digit alphanumeric code, split up by hyphens. It’ll generally be on a sticker on the back or underside of the IHD.

Let us know how you get on! You might find some helpful info in this long thread:

​The programme ​@Firedog has linked has been made by one of our Forum members, ​@MikeWilliams, who’s very knowledgeable on this subject.

I tried to register with n3rgy in November 2025, but nothing I entered worked.
I raised a ticket and this is the response I got

“n3rgy discontinued API support for consumers from 1st October 2024. This is part of the n3rgy refocusing of its services for Consumers.”

https://support.n3rgy.com/support/solutions/articles/103000315764-n3rgy-api-support-for-consumers-from-1st-october-2024

/Mike

To access your meter via n3rgy’s API, you have to be a client of one or other of their ‘business partners’, who are then responsible for the basic authentication. The system was a bit wobbly last autumn, but it all came right over Christmas and now works better than ever. I ended up signed up with both Equiwatt and Snugg; Equiwatt make it clear that you have to join in their load-balancing games to be allowed to stay on board, but Snugg (whose sign-up process is a lot more convoluted) haven’t made any such threats yet. I don’t know which one it is that makes access to n3rgy’s API possible, but it’s probably both.

This is my preferred mode; the data I get are usually less than an hour old, compared with 12-24 hours if I rely on OVO’s own website or the Bright app.
  

And this is the sort of thing I get each morning:

The Device ID is the meter’s unique MAC address, shown on the face of the meter itself both en clair and as a barcode. This isn’t the same as the one for the IHD. You’re asked for that because it’s not published anywhere, so only the IHD’s guardian can quote it, providing prima facie evidence for identification and thus authentication.
 

It was N3rgy, but seems from other replies it’s a dead end anyway. Will give this link a try, thank you.

​@Ben_OVO  hi, no I’ve had no luck. It was on the N3rgy site, but seems this might be a dead end anyway. Am going to try the link that ​@Firedog provided.

As an aside, my IHD has a Serial Number and a EUI printed on the base. I can also see these in the IHD settings as well.

It is usually the GUID that is requested .. but you have to enter this very carefully and exactly as printed. 
Be careful not to mix 0 and O (zero and capital O)