True answer: I don’t know. But the question itself answers one of mine ...

However, we have seen several cases where a smart meter installation in Northern Scotland (including in Perthshire) has failed because the meter couldn’t connect with the smart meter network (WAN). The meter’s configuration is normally completed during the installation by means of remote commands, but if there’s no connection, this can’t happen. To work around this problem, the RTS-replacement meters being deployed in many areas are pre-configured for the tariff the customer has opted for, but so far as I’m aware, this will be either Economy 7 (E7) or Economy 10 (E10).

It could be that by opting for Economy 9, your installation will depend on the WAN being available. If it isn’t, the chances are that either you’ll be stuck with Economy 7 or the installation will be aborted. If you have already changed your mind, so that you’d now hope to get E10, the meter installation team will probably want to play safe and bring a meter pre-configured for E10. That might mean a different man with a different van, and your booking would depend on his availability. Meter installers are stretched very thin at the moment, so new appointments are few and far between.

Changing tariff after installation isn’t trivial, and may not be possible at all if the WAN isn’t up to it. I hope you’ve done your sums, because it’s best to get it right first time. There are significant differences between E9 and E10 plans and rates, both PAYG and Direct Debit. See them all here: Our prices | OVO Energy 

An excellent response.  Thank you very much. 

Hi ​@Firedog 

I had a failed smart meter installation 29th November due to no signal in DD2 area and still waiting to see what OVO are going to do next, am on Pay as you go THTC but after reading through these tarrifs I pay more than what's published, even my standing charge doesn't match and yet it states on my last letter I am on the cheapest tariff  ?

Can I ask what happens after a failed installation? Are you back on the old THTC set up? 

​@kbrown36 

Absolutely nothing happened or changed so am still on Pay as you go THTC , the Engineer took one look and said you'll be lucky to get a signal, rigged up a smart meter in the cupboard and he was right, there was no signal so no installation took place, I waited for a couple of weeks and contacted OVO who confirmed they had all the information from the Engineer regarding the failed installation but would get back to me possibly with another option, not heard anything since.

Yes, I remember. I’m sorry you’re no further forward yet. I’ve no inside information, but I guess that many of the procedures for smart upgrades from RTS-controlled systems are being modified and improved as more installations take place and more experience is gained. There are just so many factors involved that what works in one location won’t necessarily work in another. Where the interim solution is to pre-configure the meter for the tariff requested, this will involve (a) workshop time which may be limited, (b) training for the engineers so they know how to proceed, and (c) new information for support staff so they know what to tell the customer, (d) new instructions for billing staff so they know what steps to take post installation. It’s a minefield that the OVO infrastructure team are undoubtedly clearing just as fast as they can. The fact that you’re on PAYG only complicates the situation further ...

I can imagine that for urban situations like yours, there are a couple of remedies that could work, but they need DCC approval and involvement, so they may take time to organize. Hang in there! 

That’s not nice. The many different heating tariffs for your region are all published, so it’s possible that the one you’re on isn’t actually called THTC - although it should be, of course. What are the various unit rates and standing charge on your latest statement?
 

​@Firedog 

Letter states my Tariff is Pay as you go - THTC 

Pre October increase                                   Post October increase

Standing Charge 62.21                               Standing Charge 62.93

Rate 1  24.19                                                Rate 1  25.43

Rate 2  18.41                                                Rate 2  21.32

January Increase

Standing Charge 62.85

Rate 1  26.40

Rate 2   21.39

Thanks.

I can only see the current rates on the  Our prices | OVO Energy page, which correspond to your Post October increase. The figures you give are the ones published , with the addition of 5% VAT:
  

… so I don’t think you’re paying more than what’s published.

sIt’s easy to be confused by that pesky VAT. While energy suppliers always work with figures exclusive of VAT, there’s a silly rule that says that ‘quoted‘ prices have to include VAT. Those are the ones you’ll see anywhere where a plan is offered for sale, e.g. at Switch and save with OVO, on Tariff Information Labels, at comparison sites or in emails and letters like the one you referred to. Pages like that should always have a note to the effect that VAT is included. On your statements, you’ll see list prices ex VAT, with the tax as a separate item added to the ex-VAT total.]

​@Firedog 

Thanks for the explanation on Tariffs, I will keep you posted if and when OVO figure out a new smart meter installation in my no signal area.