Meter times, GMT/BST, and rate1/rate4/rateT

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    Hello and thankyou for this blog for E10 users.
    I live in the Nottingham area UK.
    Could you explain if this is the correct set up for my newly installed (24th July 2017) E10 meter please.
    I was forced to have a meter change to the Eon E10 tariff by Eon as I was on their Heatwise Tariff for my night storage heaters and immersion heater. I have had Eon Heatwise for perhaps 25years from when Eon was powergen. They said I cannot no longer have heatwise tariff from 4th August 2017. My original five rate heatwise meter has now been changed to a E10 meter ,which when I press the blue button conscecutively it shows (time and date), a rate 1 peak reading, a rate 4 off peak reading and then a T reading which I do not know what this represents,although wondering if the ‘T ‘stands for total (although if that is the case the total of 1 and 4 has been rounded up by 1 eg rate 1 shows 16 rate 4 shows 25 and ‘T’ shows 42 .
    I have also noticed that the clock on the meter is 1 hour and 2 minutes slow, so when I checked at 06.40am my meter is showing 05.38am.Today my meter changed to rate 1 at approx 06.08 according to my tv news channel, but obviously it would be approx 05.06 on my meter. So could you explain the ‘T’ reading and also why my meter clock is approx 1 hour and and 2 minutes slow.


    E10 meters are set to GMT, but the clock is unlikely to be right time to the minute. Mine is eight minutes fast. You’ll soon tell if T=total!


    If you scroll back a while you will see my previous posts on this subject. Rate 1 is the “full-rate” reading and Rate4 is the 10 hour reduced rate. I think you are right that the T rate is a total (approx- as mine doesn’t perfectly match 1+4 either) The time is never quite correct as these meters no longer get an external time signal since the BBC stopped providing it! The clocks do not change to summer time so should be on roughly GMT year round. If you use any plug in timers it’s best to occasionally make sure that they are synched with the meter clock! Best of all with these meters ALL the power used during the 10hr slot is charged at the lower rate- so if you want to get the best deal that is the time to use energy hungry devices such as washing machine, dishwasher, dryer etc. Any storage heaters and hot water immersion heaters should be set up so that they can ONLY be supplied during the ten hour slot.


    Hi, your meter is the same as mine, T is for Total and is rounded up sometimes, the Meter only runs at GMT time so will be an hour different in Summer, the other few minutes is set so all meters on E10 do not switch to off peak together to prevent surges on the network, All your electric will switch to off peak now during E10 time, regardless of any time items you may have. Brian


    Thanks,I decided to ring eon and they said the same. Can’t understand really why they had to change my heatwise meter it was extremely accurate and even changed between BST and GMT. and the off peak times were vitually the same.It can’t have been to give us more choice if we decided to change suppliers as no one else in our area supports this tariff or meter.


    I’m not convinced by the preventing surges on the network theory. All that’s happening is that the meter is changing registers, nothing is being switched on or off. I reckon it’s just they run a bit fast or slow. Mine certainly loses slightly. I would have thought everyone’s time switches set to power up their storage heaters and boilers at exactly 1PM, irrespective of what time the meter thinks it is, would stress the network more.


    Maybe you are right it’s more by accident than design, but I live in a complex of 36 flats all electric heated, and if they all changed at same time, in winter they all come on together, so multiply that and it would be quite a surge … Brian


    Also Nick, in our setup the meter has total control of the water heater, so unless switched off, they all come on when it switches to E10, we have no other timer, Gledhill the boiler manufacturer recommends leaving them on all the time.


    Different sort of meter, we have a timer to tell our Gledhill when E10 times are. As an aside, our Electramate 2000 needs replacing, and I find that Gledhill no longer provide a like for like replacement – they only do domestic hot water stores. I’m having awful problems finding someone who install me a Thermaflow or McDonald system. There are another 20 in our block, all of which will fail sooner or later. I’d hate to have to move to night storage.


    HI, what an excellent site, thank you. I’m a relatively new E10 user I’m with Ovo and I’m in Isle of Wight. []

    2 days ago I discovered that the times I was given by Ovo, namely 12am-5am, 1pm-4pm & 8pm-10pm change in British Summer Time to 1am-6am, 2pm-5pm & 9pm-11pm. I was not informed of this and no where in my contract does it inform me. So since the clocks went forward in March I estimate that I have used approx 100hrs of on peak lecky thinking I was using off peak. Please be aware if you’re not already. I’ve made a complaint and am awaiting a response and unless I get re-reimbursed I shall take it to the ombudsman. I’m strongly of the opinion that they lied by omission which amounts to fraud. I will also be changing supplier in January when my contract is up, so thanks again for all the info.

    Much Respect


    Timing is always a problem. I believe that the electricity companies are not obliged to stipulate the exact times, as they can, and do, adjust by area (or remotely) to help them manage the peak loads, especially as the off-peak hours commence.
    So, the follow-on from that is that you will get, on E10, 10 hours of off peak electricity, but the timing may be different to the house next door.
    I spent a couple of quid and for a Voltage Detector Stick (eBay) and then you will know for sure your timings. Just wave it near a storage heater, for instance, and it will glow nicely when the off peak electricity is switched on.
    Remember the meters are unlikely to understand about BST and will operate only on GMT, so, again, best get a Voltage Stick and check for yourself, especially if “spring forward – fall back” is a mystery to you.


    Thank you Andrew, I hadn’t heard of a voltage detector stick before. You’re right about the meters not recognising BST and now I know I will adjust accordingly. However my issue is with companies not informing customers of this. Again you’re right and there is nothing to stop companies exploiting customers by not giving them this information. To my mind this is a loophole that needs to be closed. The companies know that many customers will be unaware that times do not keep up with clock changes and are therefore making money fraudulently.
    Just as a follow up. I was re-reimbursed the £75 that I’d estimated I had overspent as a result of them lying by omission and I would urge anyone who has fallen foul of this scam to fight back.


    Also there is huge variations in the types of meters fitted, some do switch between BST/GMT others don’t, I was told mine didn’t change between them by my supplier but I know myself they do, my current charging rate(rate1/2) shows on my display but I have a modern digital meter thankfully, I’m sure there are some very old meters out there that may not be so simple to see.


    Andrew, how does a Voltage Detector Stick work in determining off peak (and/or peak) times? Searched the web however nothing specific to the use you mention. Would appreciate yours and anyone else’s input.

    Otherwise, am currently on the hunt for a good economy 10 rate (have an economy 10 meter), currently on economy 7 Move in Saver 2 Direct Debit with Spark Energy. Their prices are going up in November 2017 so it is moving to their Simple Saver March 2019 Fixed tariff if I can’t get a good economy 10 deal.


    Hi, I am with Together Energy living in the NE of Scotland. I had an Economy 10 Meter installed by Scottish Power prior to switching to Together in July 17, so its fairly new.
    I just called Together Energy to ask about how the off peak times rate will be affected by the clocks going back this weekend and they tell me that this will actually ensure that the timings will be correct and I have been running an hour ahead all summer.

    I actually challenged this as my clock display has been running at the correct time since installation and I hear an audible click at the beginning and end of off peak timings from the meter.

    Can anyone advise if I will be an hour out after the clocks change or does my meter have a clock that will change with the clock change. For your info the clock on my meter also runs 7 mins late.


    Only Scottish Power will definitely know how your meter works, but usually the E10 times are set to GMT and are thus an hour later in the summer no matter what actual time the meter dispalys. But it’s surely simple to tell, just go and see what rate it is clocking up at say 13:30 if your afternoon cheap period is 1300-1600, the display will surely tell you.


    Volt stick – easy – just waggle it over the input cable to your storage heaters of your hot water element. It’ll glow red when current is passing (meaning your are currently on e10 rate) or not, if not.
    Jot down the times and within a couple of days you’ll have a matrix that shows your area’s e10 timings


    I agree with Nick, the meter normally stays on GMT and does not alter for BST ours works like that, you just need to alter any timers you may have which are controlling any appliances to be in line with GMT Brian


    I’m so glad I’ve come across this site, we have E10 and are with SSE, our bills have been extremely high and we are now having it investigated by the complaints team. They say that the meter is possibly running fast, another advisor said its high during the off peak afternoon period – which got me thinking are we on the right metre as techincally off peak in the afternoon shouldn’t be dear ?! Or am I wrong


    Yes you are right, if you are on E10 it should be cheaper between 13.00 and 16.00, GMT.
    You should be using roughly 1 third in dear units, and 2 thirds in cheap to make E10 worthwhile.
    Otherwise you now have the option to go on one rate for all units without meter change, since September 2017.



    Hi Mark. Always look for your site when renewing. Thanks for making things easier to understand. I am now getting different answers re off peak times. I know what they are however , having just asked the they alter when clocks go back .? I was told the times we are operating on now ( winter ) are the correct times for off peak and they actually move forward an hour in summer . I am on 12 am to 5 am , 1 pm to 4pm and 8 pm to 10 pm. So they are saying these off peak times move forward an hour in Summer time. Do you know if this is correct .?

    Many thanks


    Hi Andy, I hope you don’t mind me replying to your post though it is addressed to Mark. It’s difficult to say without knowing your specific meter model, some meters remain on GMT all the time, however some meters do change the time automatically when BST/GMT ends so the off peak times remain the same throughout the year(this is the case for myself in the North of Scotland), unless your meter has the time showing on it the only way of knowing is the old fashioned way of checking on your meter once BST comes around and look at your meter when it is due to switch between rate 1/2 and see if it moves rate at GMT still, I hope that makes sense. Sorry I couldn’t give you a more simple yes/no reply. I hope this has helped but if you have any more questions feel free to ask.


    I take 2 reading from my E10 meter rate1 is the higher cost rate , Rate 4 is the lower cost 5 hours at night, 3hours in afternoon and 2 hours 2000-2200 hrs GMT.

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