Over the last 6 months I have been carefully following the various Forum threads regarding the (now delayed) RTS shutdown and the consequential loss of the THTC tariff. To date I have had no information directly from SSE (soon to be OVO). When I called the SSE Specialist Heating Team was I assured by someone that my supply is not in jeopardy and that a technical solution is awaited to allow a SMART meter installation, but no timescale was given. Nor was there any acknowledgment that the lack of network coverage in my area (NW Sutherland) had previously precluded fitting a SMART meter anyway.
The main reason for trying to get concrete information revolves around my intention to upgrade my old storage heaters to more energy efficient models which are also controllable remotely. As I understand it the modern heaters work best on Economy 7 or 10 (if available) tariffs which means if I want ultimately to save money, I need to change from the current THTC meter.
Does anyone have any up to date information or is it still a case of wait and hope?
Best answer by Blastoise186
Updated on 09/12/25 by Chris_OVO
That’s right, yes. You’d still get the heaters coming on and off if RTS dies, but it would be at fixed times.
All suppliers will contact customers once a solution is ready and this includes OVO. SSE probably won’t be contacting as many people from here though as the original plan had, as the SSE to OVO Migration is progressing at a fast pace. But either way, both yourself and your neighbours will be kept in the loop
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.
Since June 2024 we have begun writing to our Economy 10 RTS customers to invite them to call us to arrange for their meter exchange.
I’ve seen the solution that’s being developed and from my understanding, it’ll be a pretty much drop-in replacement for your current setup once it’s ready, albeit with one meter rather than two. It needs a bit more work yet though.
If the RTS Service shuts down before it’s ready, your THTC Meter will run with a static timeswitch to prevent loss of supply. The difference being that it’ll run using the last known schedule and will no longer be dynamic in when the relays get switched on and off.
The fact that the RTS might be switched off before a fix is in place still worries me more than a little. Presumably you mean that running as a static time-switch would mean that the storeage/water heaters would come on at set Off Peak times rather than variable as with THTC? This would obviously be on a different tariff. My added complication is that the house is a holiday home and not occupied all the time over the winter period to constantly monitor the supply.
Hopefully a solution will be found, but in the meantime a little clarity and up to date information directly from SSE/OVO would not go amiss. Anecdotally, some of my neighbours on THTC are blissfully unaware of any of this.
That’s right, yes. You’d still get the heaters coming on and off if RTS dies, but it would be at fixed times.
All suppliers will contact customers once a solution is ready and this includes OVO. SSE probably won’t be contacting as many people from here though as the original plan had, as the SSE to OVO Migration is progressing at a fast pace. But either way, both yourself and your neighbours will be kept in the loop
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.
Since June 2024 we have begun writing to our Economy 10 RTS customers to invite them to call us to arrange for their meter exchange.
I have RTS meter for heating and hot water on a Total Heating Total Control tariff. My house is in the IV27 postcode area of Sutherland. I have been following the OVO Forum discussions on the RTS shutdown for a considerable time and I think I understand fully that there are technical and geographic issues involved in installing suitable replacement meters. Somewhat belatedly Ofgem now have an advertising campaign urging those affected to take urgent action with their suppliers.
All along there have been assurances from OVO that a suitable “fix” will be in place for all customers prior to the shutdown deadline on 30 June 2025. This line continues in the most recent FAQs published online, and in responses in the Forum, which state you need do nothing until contacted by OVO. At the same time you are encouraged, when contacted, to make an appointment without delay as there may be a backlog as cut off approaches. I also received an e mail on 29 November 2024 from OVO giving the same advice. It is, however, now less than 19 weeks until the shutdown and I’ve heard nothing further. I’m sure I won’t be alone. OVO themselves, in their FAQs, say 100,000 customers are likely to be affected.
Despite the somewhat longwinded preamble, my question is simply this - despite their reassurances, can we have confidence that OVO have sufficient resources in place ie trained technicians, to deliver on their promise to have a solution in place for all customers by the 30 June deadline and what will happen if they don’t?
I will need to ask the Forum Moderators for help with part of the response to your question as I don’t think some of it has been totally ironed out yet. @Ben_OVO if you’re around could you swing by?
In the meantime, you should now be able to book if you call 0330 303 5063 and ask for Squad 70. That team is specially trained to deal with RTS Meter setups and should be able to see if slots are available.
I also know that OVO has been working like mad to get their Smart Meter Engineers trained up for RTS and IIRC pretty much all of them now have the required skills. Our very own Forum Engineer, Luke, for example is trained in doing tons of different setups. One of the local ones near me (howdy Ben!) also told me he’s had it too.
No worries. Sorry I couldn’t help answer the entire question - it just sounds like something that has to be absolutely nailed or it causes nightmares… And I can’t answer a question if I don’t feel confident about my answer.
Sorry about that. I’m always learning though, so I might have it for you in the future!
Thanks @Blastoise186 for giving me a nudge. Just to confirm, I was recently speaking with one of the managers in ‘Squad 70’ who @Blastoise186 mentioned you should get in touch with. They have advised that their teams are working hard every day on researching potential problems with the RTS shutdown, and how they can be alleviated before the shut off date. I’m sorry to give a generic reply here, but all I’ve been made aware of is the fact that the relevant teams know exactly what issues are being/will be encountered and are working tirelessly on ensuring everything can be resolved before the end of June. I’m not sure if you’ve spoken to Squad 70 as per Blastoise’s advice yet - they may be better placed to give you some more concrete answers.
Just to reassure you - a large amount of people within OVO have been working on the RTS shutdown for a long time now, we’ve got good people on this and we’ll do everything we can to ensure this all goes as smoothly as possible. When we hear of any updates or news we’ll make sure the Forum content is updated for you all. This is a huge change in the Industry and we’re doing everything we can to be prepared for it, and to give the best possible service to our RTS customers.
I have now spoken with Squad 70. As you indicated, it very much seems as if each RTS meter replacement gives rise to unique issues for which there is no single solution, although lack of a signal appears to be at the core of it. Two years ago I wanted to upgrade to more efficient storage heaters and fit a SMART meter but was told it wouldn’t work for this reason. The person I spoke to at Squad 70 said they couldn’t allocate any slots at present but indicated they were working through various possible solutions and I would be contacted ahead of shutdown to implement something (?) to maintain my heating supply.
I can’t help thinking that there is an analog solution to this - off peak storage heaters worked perfectly well for years before digital “improvements” came along.
So, all in all, I’m no further forward and with the clock ticking I will have to rely on OVO’s assurances that a solution will be forthcoming before the deadline. I suspect I am not alone in not holding my breath!
Unfortunately, whether analogue or digital… This stuff has a finite lifespan. And analogue stuff isn’t really used much anymore.
Regardless of the tech or what transmitters/receivers are used, it’s ultimately the same kind of radio signal - if the signal doesn’t reach you, it won’t work anyway.
The ultimate reason that RTS is being killed is because the equipment at Droitwich Transmission Station has reached End of Service Life. The glass valves that are used only last a couple of years at a time and when they blow, they blow hard by exploding. Replacements cannot be sourced anymore - they’ve not been made in over 20 years.
Hi, I currently have the Scottish THTC (Total Heat Total Control) tariff and meter set up. I am soon changing to a smart meter and Economy 10 tariff because of the RTS (Radio Teleswitch Service) switch off in June 2025.
I currently have two non revenue sub meters (standard use and heating/THTC) in an annexe part of my house so that I can measure how much electricity is used there. But I am billed on just one bill for the whole house based on readings from my main meters.
Will it be possible to replace my non revenue meters so that I can continue to measure the use in the annexe? I accept I would need to do and pay for this privately. I’m not sure how the current system, with separate standard and heating circuits and meters would change to a time based system with off peak and peak measurement. Would I have to buy a single (peak/off peak) meter and route all the wires for the annexe through that meter? Could I somehow re-use the existing meter(s)?
I suspect you’ll be able to just keep using the sub-meters more or less as they are now. But you’d obviously want to grab a meter reading from them just before the engineer kills the supply meters so you have a new starting point after the upgrade work is done.
But could you show us some photos of the setup by any chance? If you’ve got wiring diagrams too, that’d be amazing.
Thanks for your swift response. Sorry I’ve only just been able to reply. I’m attaching photos but do not have wiring diagrams, sorry.
The first photo shows the main meters for the entire house (Std and THTC) and the consumer units for the house (excluding annexe). So, the circuits for Storage heaters, panel heaters, showers and water tank all go through the THTC meter which has a cheaper unit rate, whatever time of day. The other circuits (lighting, sockets, cooker etc) go through the standard meter which has a more expensive unit rate, whatever time of day.
The annexe meters are shown in next pictures. Again, the heating, water and shower go through the THTC meter and the other circuits go through the standard meter.
My understanding of the Economy 10 tariff, that I’m forced to move to, is that the entire
electricity use is measured together but counted as peak or off-peak, depending on time of day (ie no matter what the electricity is used for). So I’m not clear how the meters could continue to be used. I was thinking that all the annexe circuits would have to go through a new dual (peak/off peak) sub-meter so that I can see how much is being used at each rate.
Alternatively, I guess that if I thought the standard use electricity was not that significant I could re-use the standard meter and direct all the annexe consumption through that. It would show total Kwh used but I’d have to come up with an adjustment to the unit rate if I wanted to charge for annexe use fairly…..
I think you may just have to end up being very careful, but I’ve got one more question - this will absolutely help us figure out how to answer your question.
Is someone living in the annexe who pays you for what they use in some way?
In the past we have used annexe for holiday let but not charged for electricity directly. Just used it as guide to costs. Now have friend staying as lodger and using meter readings to assess electricity bill on monthly basis.
Is there anything to stop me buying a dual meter and feeding everything through that?
You can if you want to - I suspect it may be your only option.
Make sure you don’t make a profit out of this though - otherwise you get snarled up in legal red tape that you really don’t want to be wrapped up in...
My elderly parents are extremely clinically vulnerable (88 and 90, numerous health issues inc COPD, heart disease and lower leg amputation).
I know the radio signal is being switched off and I need to ring and get them a smart meter fitted. I have been holding off as they still have their heating on full time, and I couldn’t risk anything going wrong/them being without heat for even 1 day. Now it’s warming up and they will be switching the heating off soon, I am ringing up to book an engineer appointment.
I have enclosed some pics of the set up. This meter is decades old (they are the generation that if something worked, they just plodded on with it for years). They migrated from SSE to Ovo. They have an economy 7 set up I believe with an afternoon boost to their storage heathers (all electric house, no gas). They also have an economy 7 immersion heater which gets the same overnight and afternoon boost.
My question is: is this a set up that can be switched over to smart meter or does anything have to change compared to how they have it now? I have calculated a whole previous years’ bills and bc they have the heating on for at least 7 months of the year, it is barely any different to what a single rate would cost.
Their bills are broken into off peak rate, peak rate and heating rate (I input 3 sets of readings on the ovo website). Because they have storage heaters we need to be able to have overnight boost and afternoon boost.
One vital fact you forgot: where your parents live. The options vary considerably across the country. It’s usually enough to know the first part of of the postcode, or the nearest town if they’re in a rural area.
The big before/after difference is that there will no longer be a 24-hour heating circuit as they may have at the moment (“I input 3 sets of readings on the ovo website”). This means that the lower rate for heating will only apply during offpeak hours, so the new arrangement will involve some changes to behaviour if your parents are to avoid paying too much for their heating. It would help to know what other heating equipment they have, if the storage heaters aren’t able to to keep them comfortable all the time.
There doesn’t appear at first sight to be anything to prevent a straight exchange of the old telemeter for a new smart meter. If the new meter is able to communicate well with the smart meter network (the ‘WAN’), it’s all a bit easier.
I’ll be back with some suggestions when I’ve seen your reply.
Thankyou for your reply. They live in the south east (SL6).
They currently have 3 working storage heaters (one broken one at the bottom of the stairs) and for 90% of the winter this is sufficient. I have a little portable oil filled radiator that I put on in their bedroom on really cold evenings as they have no heater in their bedroom (at some point we will overhaul the electrics and buy more modern storage heaters inc for their bedroom, but that will come later…..)
Thank you. I suppose Royal Berkshire is south east if you’re looking from Liverpool …
SL6 is I think in the Southern Electricity Board area, area ID 20 and GSP group _H, now served by SSEN. If the night storage heaters (NSH) aren’t the oldest, it’s possible that they would work well enough with an Economy 10 (E10) plan which gives five hours of charge overnight and three in the afternoon - most NSH are designed to achieve full charge after seven hours. There are also two extra offpeak hours in the late evening, but they may not be of much use for the NSH. They are useful, though, for warming up the bedroom and perhaps the living room if the NSH are beginning to fade by then.
E10’s five hours overnight would normally manage to heat up enough water for two people, unless they both take deep hot baths every day. If showers fed from the hot water tank are involved, the five hours should be plenty. Electric showers are very expensive to run at peak rate. This table shows the various tariffs I could find; it’s not certain that Economy 9 is available in the Southern region, but I doubt the tariff would be published if it weren’t:
E&OE
The costs depend very largely on the usage pattern. If there’s a chance of running greedy appliances other than heaters (e.g. aforesaid electric shower, tumble dryer, cooker, iron ...) only during offpeak periods, costs would be minimized. It’s not unusual for an electrically-heated household to use 75% of the total energy consumed during offpeak hours. This table shows some comparative figures to illustrate the effect of changing the proportion of offpeak usage:
E&OE, redoubled in spades ...
I hope this helps you arrive at a sensible conclusion. If it just confuses you, please come back and say so and we’ll see if anyone else has better ideas.
Thank you so much for this. It is great to have a breakdown of the hours with the different E7/9/10 options. I am going to study them more later and see which I think matches their pattern more closely.
We are really more like Greater London, but on all official forms we are SE (just!).
I suppose my main worry was if this set-up would work with a new smart meter. I will ring them on Thurs when I’m next free and book an engineer. Fingers crossed there won’t be any issues with it.
The OVO engineer came yesterday morning. He said it was a simple switch over to a smart meter. However when he took the plate off to see the wires, there was dust in there. I explained that we are a middle terrace and the 2 other house are still council owned. They re-did the cavity insulation 18 months ago and when they blew all the old cavity foam through it came into our porch. They cleaned it as best they could, but there is obvs still dust on the inner bits. I couldn’t prove it wasn’t asbestos, so the engineer left, saying they will re-book a full face engineer to do it.
Today I phoned ovo, and they have said because it is flagged up as possible asbestos (it isn’t-all the other houses have had their meters switched long ago) I need to contact SSEN (who were the original fitters apparently) and have an asbestos certificate before OVO will send another engineer out.
I am currently 2 hours into waiting for a call out for SSEN. This is obvs quite stressful because my parents are clinically very vulnerable. I waited to switch because they were still using the heating up till 2 weeks ago, and I couldn’t risk anything going wrong and then being without heat. Now I am worried that we won’t get this fixed before end of June when the RTS switch off is.
Can an independent electrician fit a smart meter? Can I request the current meter to be switched to daytime only and switch the tariff from Economy 7? I’m just trying to figure out an action plan if we can’t get this fixed before RTS switch off as I’m worried they won’t have electricity :(
