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lyeuhm
Rank 1
Rank 1
February 27, 2023
Solved

THTC / Separate Radio Teleswitch and Meter- Can I get a smart meter?

  • February 27, 2023
  • 291 replies
  • 8053 views

Hoping someone here can help because this has been an on-going battle since before OVO took over SSE and it’s gotten progressively worse recently. 

I live in a house that’s meters haven’t been checked, inspected, whatever since at least 1993.  I have two meters - one for my storage heaters and water tank, and one for standard electricity.  I’ve been trying to get this changed to either a smart meter if available OR just a standard single meter with a day or night rate. 

I have email chain(s) going on with SSE/OVO (One email chain is using @sseenergyservices.com and the other is @ovo.com hence posting here) that I seem to just be going around in circles.  I finally got through to the Electric Heating Team (EHT) about two weeks ago who changed me onto a single rate THTC tarrif, so both my standard and heating meters are at the same rate - but based on the readings that I’ve been providing, it’s still nearly 500 a month just for two storage heaters and a water tank.

Has anyone else had problems being switched to a single meter?  It’s driving me insane and I can’t change providers even if I wanted to because I’m currently bent over a barrel with an old meter system that they won’t change that no one else supports.

 

Edit: Just to add, it’s Radio Teleswitch Total Heat Total Control (THTC) to be specific.

Best answer by Emmanuelle_OVO

Updated on 16/05/25 by Emmanuelle_OVO:

 

Update on RTS shutdown:

 

As part of the RTS Project development, we are really happy to share with you our progress:

 

As you may be aware, the RTS signal that instructs some of our meters when to move to the “Off Peak Period”  will be closing down soon and we need to arrange for all of our RTS customers to have a meter exchange so they don’t lose any of their meter functionality.

 

The RTS signal will end for our customers on 30 June 2025. The period between 1 July - 30 September 2025 will then be used to close-down the RTS signal and allow us to manage any unexpected customers impacted.

 

After a very successful pilot, from the 17th June 2024 we will begin writing to our Economy 10 RTS customers to invite them to call us to arrange for their meter exchange. 

 

We are continuing to work at pace to enable the same solution for the majority of our other RTS customers and our aim is to begin writing to these customers in Aug 2024. 

 

We will continue to update you on our progress.

Hey @Noz1954,

 

I don’t know the exact figures, I’ll see if I can find out. I’d imagine a few thousand as Blastoise advised.

 

We’ve had a couple of customers on the Forum who’ve advised they have THTC set ups, would be interesting to get a conversation going. 

 

 

We’ve got an FAQ on exotic types which might have some useful information:

 

 

291 replies

Rank 6
June 5, 2024

It would be interesting to know what the transmission and distribution network issues that impact on THTC are. Could you please explain?

One of the Scottish issues is probably that currently the Shetland isles have a local diesel fuelled power station supplying elec to the islands population (23,000). No mains gas means mostly elec heating, to help the load demand on the local station a version of THTC was installed in many homes. A huge subsea cable is currently being commissioned to finally connect the islands to the national grid meaning the local power stn load management issues will no longer be an issue.

Sorry but I cannot answer for situations outwith mainland Scotland as some islands will be supplied by an undersea cable and others by an on-island supply source eg, wind farm, diesel etc.

As to distribution networks, this is split into high voltage (generally the lines on pylon towers) and low voltage (33kV or less) In the UK, high-voltage network substations are used to step down the voltage levels from 275kV and 400kV to 132kV for distribution. Intermediate electrical substations then reduce the voltage further from 132kV to 33kV and 11kV for transmission to final distribution substations. Here, the voltage is reduced further to the 400V or 230V typically used commercially and domestically. Which part of the system has the issues is, as Blastoise186 said, a closely guarded secret and not something we will ever know the details of.

I am in NE Scotland, one of the areas with the highest concentration of onshore wind farms in the UK. Now maybe I am a cynic (in fact I know I am one) and I also ask myself why, if we have so many wind farms, we pay some of the highest transmission charges in the UK.  I even look out on windfarms but I do not get the benefit of all the power that is produced. AND I also pay for them being switched off when the wind is blowing (hundreds of millions of pounds per year) when the distribution system cannot cope with the energy produced.

If only the general public were made aware of and took an interest in all that is going on in the electricity supply chain there would be an outcry. All the public see from politicians is the smoke and mirrors of “the Green Transition”. I have been researching this since 2010 when the coalition government started tinkering with energy supply and ended up loading electricity bills with the majority (circa 90%) of the cost of the new social and environmental schemes they introduced and foisted onto suppliers (ECO, FIT etc) and then customers. Gas users typically only saw 10% of the cost of these schemes onto their tariffs. Emails to my local MP were flying off laptops and dont get me started on about Ed Davey MP (energy minister at the time)!

Time to get off my soapbox!

 

I wasn't very clear, I was just pointing out that there's also a generation issue in Shetland that's stopping them junking THTC, probably a few thousand homes in Shetland stuck on THTC till Shetland is linked to the national grid.

They're about to switch on the Viking onshore windfarm in Shetland so there'll be 450mw coming down the subsea cable to mainland Scotland shortly!

I have a house in Aberdeenshire supplied by Octopus, elec tracker and solar export and I have full control to choose my supplier and tariffs. And then there's our small house in Shetland, THTC and locked to maybe 3 suppliers with tariffs that don't support modern efficient heating systems.

 

You'll be glad to know that once the subsea cable goes live UK (mainland) elec consumers will see a very small reduction in their annual elec costs as they'll no longer need to subsidise elec generation for Shetland consumers 👍

 

Rank 6
June 5, 2024

Here’s an article that may be of interest if you haven’t seen it already.

John's switch from restricted to single meter wasn't easy | Home Energy Scotland

 

Seen this previously. I've been told by OVO that when they install the new meter to replace the THTC setup they'll look to arrange to have the 2nd meter point reference de-energised and move me to a single meter point reference number to allow me to move to a single tariff. Hardly a 100% guarantee but I do have it in writing from OVO following a successful complaint to the ombudsman.

A friend of mine who lives a few miles from me has THTC and is with Utility warehouse (storage htrs removed so static meter reading) has just been informed they're shortly fitting a smart meter and removing the redundant meter for the storage heaters.

Does look like things are starting to move in the right direction.

Firedog
Super User
Super User
June 5, 2024

When the THTC meters were installed, the distributor and the supplier of electricity were probably the same organization, in many cases the local Electricity Board. This all changed with the privatization of electricity distribution and supply, so now we have a hybrid system with regional distribution companies and national suppliers. It’s not surprising that there’s confusion over who actually owns the THTC meters and, more importantly, who is responsible for their management and operation.

Some customers have had success with persuading the DNO to take the initiative to having redundant meters and their corresponding MPANs removed; others (like @Infiltrator’s friend) have seen the supplier do the same. If the THTC meter is clearly not being used, this is a possibility, for example if storage heaters have been replaced by a heat pump. As far as OVO is concerned, having two MPANs for the same supply seems to create an automatic block on having a smart meter installed. Of course there may be other considerations, too, like in communications black spots or in areas governed by load management schemes.

 

Noel | I have no official status; I'm just a volunteer who comes here to help other customers. My gear: Aclara SGM 1416-B Electricity-only E7 meter; Chameleon IHD3-PPMID-AAA | It may look as if I know what I’m talking about, but don’t let that fool you. |
Emmanuelle_OVO
Retired Moderator
Retired Moderator
June 6, 2024

Thank you for sharing your insights & experiences. It’s been a while since we’ve had an OVO update related to THTC, I’m going to see if I can chase up an expert in this meter type & see if there has been any progress or updates.

 

I’ll report back to this topic. 

Renewable Energy? Big Fan.
Blastoise186
Super User
Super User
June 7, 2024

What’s probably worth noting however, is something that both myself and @metalsman have been trying to make clear (thanks for the assist by the way, much appreciated!).

The stance we’re taking on the Forum is to try and avoid making promises that we’re not 1,000,000% confident about - such as whether you can simply come off of THTC anytime soon. We’ve opted for this because we don’t want to get peoples hopes up only to throw you off of a cliff later when it doesn’t happen - it’s much better to burst that bubble now and replace it with a new one “later” if that makes sense.

As it so happens, I was chatting to a couple of National Grid engineers about THTC today (as in their DNO engineers who used to be part of Western Power Distribution) since I’m able to do that from time to time, these guys work on the 11,000V substations and transformers as part of their day jobs, so they know what they’re talking about. Didn’t get tons of time per se, but enough for a quick chat. Please note that I don’t normally get direct access to these engineers - it’s literally just a one-off thing and I can’t just turn it into a free-for-all to ask whatever I want for hours on end. I can only get maybe 10-20 minutes a day with them for a few days this month and that’s about it (and I kinda want to make the most of that for more than just one thing!).

They also seem to be taking the same stance - much of the infrastructure stuff is considered sensitive info that cannot be shared publicly because of the risks involved. Likewise, they share the views that the infrastructure up north desperately needs to be upgraded before anyone can even think about permanently nuking THTC completely.

While these specific engineers don’t work up in Scotland, they know how this stuff works pretty well and the discussions I’ve had - while they can’t be posted here - has given me some new info that I can use to further my research in the background.

Securing energy by zapping security bugs... For that is The Blastoise Way! Remember, I'm just like you - AI Powered Evil Geniuses aren't Staff!
Rank 6
June 11, 2024

What’s probably worth noting however, is something that both myself and @metalsman have been trying to make clear (thanks for the assist by the way, much appreciated!).

The stance we’re taking on the Forum is to try and avoid making promises that we’re not 1,000,000% confident about - such as whether you can simply come off of THTC anytime soon. We’ve opted for this because we don’t want to get peoples hopes up only to throw you off of a cliff later when it doesn’t happen - it’s much better to burst that bubble now and replace it with a new one “later” if that makes sense.

As it so happens, I was chatting to a couple of National Grid engineers about THTC today (as in their DNO engineers who used to be part of Western Power Distribution) since I’m able to do that from time to time, these guys work on the 11,000V substations and transformers as part of their day jobs, so they know what they’re talking about. Didn’t get tons of time per se, but enough for a quick chat. Please note that I don’t normally get direct access to these engineers - it’s literally just a one-off thing and I can’t just turn it into a free-for-all to ask whatever I want for hours on end. I can only get maybe 10-20 minutes a day with them for a few days this month and that’s about it (and I kinda want to make the most of that for more than just one thing!).

They also seem to be taking the same stance - much of the infrastructure stuff is considered sensitive info that cannot be shared publicly because of the risks involved. Likewise, they share the views that the infrastructure up north desperately needs to be upgraded before anyone can even think about permanently nuking THTC completely.

While these specific engineers don’t work up in Scotland, they know how this stuff works pretty well and the discussions I’ve had - while they can’t be posted here - has given me some new info that I can use to further my research in the background.

Appreciate the update. 

It's interesting to note that when THTC was introduced it benefited both the regional energy boards, by managing demand, and the customers, as they were offered attractive tariffs and modern heating systems (storage htrs) to assist to the uptake. It seems nowadays that we have DNOs and separate energy suppliers the only party who still benefit from THTC are the DNOs. The energy suppliers only see THTC as an inconvenience but because its still being used to manage demand the customers are stuck with probably the most ineffective and expensive heating systems - at a time when the government are trying to encourage people to install more energy efficient heating systems. I do appreciate it's not an easy fix but the customers do appear to be getting the raw end of the deal by having no choice and very limited communications. 

Blastoise186
Super User
Super User
June 11, 2024

Howdy!

Please watch this space, some hot news is on the way regarding the future of THTC. So hot in fact, that I’ve not even had a chance to write the post yet - I literally just got told it today.

At the moment, it’s not ready for primetime juuuuuuuuuuuust yet, but I’m going to start working on getting it written up later this week and hopefully get some initial feedback. I want to make sure it covers as many bases as possible because I can already foresee it blowing up the internet pretty rapidly - and I REALLY don’t wanna mess it up! :)

Please allow me some time to get things written up and checked over, as well as getting permission to make it public (I need OVO’s permission for this one!). We don’t yet have an exact date as to when I can spill the beans, but please keep watching the Forum - feel free to check in anytime and we’ll try to tell you whatever can be made public at that point.

Securing energy by zapping security bugs... For that is The Blastoise Way! Remember, I'm just like you - AI Powered Evil Geniuses aren't Staff!
Rank 3
June 11, 2024

Brilliant posts. Thanks for all your help. I had no idea that Utilities was such a 'minefield!'. I suppose like everyone I just expected, to able to get an energy package that suits my needs. These Energy/Utilities must have something like a 'thirty year plan' to work to. I know the infrastructure/hardware is so out of date, and that technology leaps ahead, and I am stuck somewhere in the middle with my THTC!!!! Not going to do anything rash, just stay with OVO and monitor the costs and see what the future brings. This forum has been very helpful, learned more about the state of Utilities in the UK than countless phonecalls to OVO. Thanks again🙂

Blastoise186
Super User
Super User
June 11, 2024

Well, in some ways being me has its privileges. I was able to access OVO’s Smart Meter Lab again today - which is HIGHLY restricted access - and had the chance to speak to one of my internal contacts at OVO. This person prefers to remain anonymous which is a request I respect, but they know an absolute ton about this stuff - literally more than I do - and have helped me out several times in the past when I’ve gotten stuck myself.

It’s because of that visit that I now know the planned future for THTC and it’s actually quite interesting - not least because this time, I actually got to see the physical THTC Smart Meter Test Rig rather than just a photo of it on a slideshow.

We were in there for maybe a good hour or so, which was plenty of time for the “Brain Frying Machine in the Cabinet of Doom” that is the Arqiva WAN Rebroadcasting Unit to have fried our brains - except it didn’t because that stuff doesn’t happen outside of comics. And if that monster can’t fry my brain after being directly exposed to it for an hour, then neither can Smart Meters that are 100x less powerful. :)

Securing energy by zapping security bugs... For that is The Blastoise Way! Remember, I'm just like you - AI Powered Evil Geniuses aren't Staff!
Rank 3
June 12, 2024

You’re enjoying all this teasing, I suspect...