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Rank 2
October 7, 2024

Moving to OVO Economy 10 (with or without storage heaters)

  • October 7, 2024
  • 111 replies
  • 5097 views

Has anyone successfully moved to Economy 10 with OVO and was your experience?

A few weeks ago I received an email from OVO about the removal of the RTS signal and suggesting I book an appointment to replace my meter. I was a THTC customer so I chose Economy 10 and booked the appointment.

Six days ago the new meter was installed with an In House Display (IHD). The IHD is operating in accordance with the Economy 10 tariff but the meter is supplying power according to Economy 7 times, i.e. power comes to my storage heaters between 01.00 and 07.00 but I am being charged the lower rate at Economy 10 time periods. That means I am being paying the higher rate to charge my storage heaters overnight (and it is getting cold in highland Scotland)

OVO customer support first of all offered to re-program the meter in 6 weeks; they delay because they needed to wait until communication with the meter was established (?). I managed to negotiate them down to making an appointment for a site visit in 2 weeks time.

Tens of thousands of these THTC meters need to be replaced before next June. This is a huge undertaking and my experience indicates the need for a separate help line for follow up support. It has taken me a week and a lot of investigation to get to this stage. My contacts with OVO support via on-line chat have been like wading through treacle. I think OVO need to get on top of this asap because there are very many vulnerable people using the THTC tariff with storage heaters.

An additional complication is that storage heater users have been encouraged to replace old heaters with Dimplex Quantum heaters. The preferred installation uses two power sources - one a 24 hour supply for the heating controls and the other so supply the bricks from off peak. There is a different internal cable setup for a single supply. THTC provides these supplies through two meters. In my ignorance I thought moving to one meter would mean one supply. Apparently the wrongly installed Economy 7 meter provides two supplies. 

Does anyone know if Economy 10 is one supply being billed at the different rates depending on time od day. The IHD would tend to support the later as it is happily billing me as per the Economy 10 tariff.

I hope this lengthy post wiil help me and the wider community with your responses.

Pinned Reply By Firedog

You’re not alone. Please see my lengthy reply here:

 

Since this major operation (replacing hundreds of thousands of old RTS meters with smart ones) has only been underway a few weeks, we don’t have much experience of how it’s going. We really only hear in this forum about the ones that go wrong, and not all of those who come here for advice come back to tell us when it all comes right.

Anyway, your situation seems to be very similar to that of the customer I responded to yesterday. In the absence of any information to the contrary, I’m afraid I can’t make any other suggestion. As always, photos would help.

I shouldn’t worry about the power supply to the night storage heaters (NSH). There are indeed two separate supplies, one that is always live (constant) and the other that is only live in offpeak periods (switched). The engineer should have made sure that each NSH is connected to the right circuits. You say your NSH are charging overnight; are their controls active during the day, so you can select ‘comfort’ times and so on? 

Photos, please!

111 replies

Firedog
Super User
Super User
December 2, 2024

Tarriffs are  26.2p standard  21.26 economy  62p standing charge, which I think is a ripoff.
 

Did you get those figures in writing, e.g. in a change of tariff email? I’m asking because I couldn’t find a plan with those rates on OVO’s plans page

Why do you think this is a rip-off? So long as you’re using more than ¼ of all your electricity at offpeak times, the Economy 10 plan will be cheaper than the price-capped Standard Variable Tariff. Have you compared with other suppliers?

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. |
KeastAuthor
Rank 2
December 3, 2024

@Blastoise186 ​@Firedog 

It is now 2 months since my RDS meter was replaced but off peak power is still being delivered at Economy 7 times, instead of the Economy 10 service I requested. Two of OVO’s deadlines have now been missed.

My latest online chat person said my case is with the ‘resolution team’, they were not able to provide me with a response time, or contact info for that team; I was advised that the ‘process needs to be followed’ and someone would be in  touch.

(I wish I knew what the process is and where I am in it. I don’t appreciate being treated as if I am stupid.)

I live in not very rural Perthshire and don’t understand why I cannot get the service OVO encouraged me to request. If any OVO rep is monitoring this, I would appreciate an explanation. I am happy to be patient if I am kept informed. 

It is encouraging to hear other users have successfully transferred to Economy 10 but I would advise them to take careful observations to confirm their off peak supply is arriving at the correct time.  

 

 

Blastoise186
Super User
Super User
December 3, 2024

@Abby_OVO I think you fixed one of these earlier. Got the same magic tricks ready for ​@Keast ?

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 7
December 4, 2024

Tarriffs are  26.2p standard  21.26 economy  62p standing charge, which I think is a ripoff.
 

Did you get those figures in writing, e.g. in a change of tariff email? I’m asking because I couldn’t find a plan with those rates on OVO’s plans page

@Firedog these are the figures (inc. VAT) for E10 where I live - 30 miles north of Inverness

Firedog
Super User
Super User
December 4, 2024

… ​​​​​​ these are the figures (inc. VAT) for E10 where I live - 30 miles north of Inverness
 

I just checked the prices, and found these:
 

  
Close, but not close enough … A penny here or there can turn into pounds when you calculate the costs for an electrically-heated household over a longer period, and this can alter the results of comparisons between suppliers.

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. |
Abby_OVO
Community Manager
Community Manager
December 4, 2024

Hey ​@Keast 

 

Sorry to hear about this.

 

@Abby_OVO I think you fixed one of these earlier. Got the same magic tricks ready for ​@Keast ?

Thanks Blastoise!

 

I’m going to reach out to you via private message to take some details and see if we can do something remotely about this. 

 

Look out for pm here soon: https://forum.ovoenergy.com/inbox/overview.

Currently Playing: She's Electric
Newcomer
June 17, 2025

Have 7 dimplex old style storage heaters, hot water cylinder in attic. Located in Highlands Scotland. Assuming I receive a signal, firstly what type of smart meter should OVOvengineer install for economy 10? 

Secondly, will my dimplex heaters work as before but with the economy 10 times?

Thirdly, will my hot water cylinder be heated up as before?

Lastly, I'm on a direct debit and would like to only pay for what I use. Can I ask OVO to change my billing?

Thanks 

 

Firedog
Super User
Super User
June 17, 2025

Have 7 dimplex old style storage heaters, hot water cylinder in attic. Located in Highlands Scotland. Assuming I receive a signal, firstly what type of smart meter should OVOvengineer install for economy 10? 
 

The normal arrangement would be a five-port meter, with the heating equipment (storage heaters and immersion water heater) fed from the fifth port, which would only be energized in offpeak periods. Everything else would be fed from the fourth port. 
  

Secondly, will my dimplex heaters work as before but with the economy 10 times?
 

Yes, assuming they’re wired up as above.
  

Thirdly, will my hot water cylinder be heated up as before?
 

Yes, but you may need to check the tank’s controls. It won’t normally be necessary to have the immersion heater on for all of the ten offpeak hours each day.
  

Lastly, I'm on a direct debit and would like to only pay for what I use. Can I ask OVO to change my billing?
 

All customers only pay for what they use, but there may be differences in how much they pay or when. OVO don’t offer variable Direct Debits, only fixed ones calculated to cover the estimated costs by equal monthly payments. Other options are prepayment - the cheapest - or payment on demand, i.e. on receipt of bill. This is the most expensive, with the annual standing charge alone £25 higher. 

 

 

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. |
Newcomer
June 18, 2025

Thanks very much for the information. 

Ben_OVO
Community Manager
Community Manager
June 18, 2025

Thanks for your post ​@cullywully.

 

I’ve nothing to add over ​@Firedog’s great answers here, but I wanted to just drop in and let you know that you do have the option to pay in arrears each month for what you use. However, paying like this is only an option if you opt for the variable (Simpler Energy) plan; you can’t pay in this way on one of our fixed plans.

 

Something for you to bare in mind, but remember that the Simpler Energy plan costs go up and down according to the Ofgem Price Cap amendments. A fixed plan can potentially protect you from increases to the price cap.

 

 

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