Monday, 20 July 2015

Electricity Meters Running Backwards

I've had a comment on my post 'Reverse Energy Detected' from an anonymous  contributor  who asks "I've had solar panels for 5 years," "could my new digital meter be recording usage differently than my original analogue meter?"

Since the feed-in tariff scheme launched in April 2010, some households with solar PV panels have experienced their electricity-usage meters (otherwise known as supply or mains meters) running backwards. 

So, every time the solar panels are exporting to the grid - because the panels are generating electricity, which is not being used in the house - the mains electricity meter starts turning backwards. The result is lower electricity bills for the householder, as the reading will be less than expected. This seems to happen mainly with analogue meters without an in-built 'backstop', as the flow of electricity goes the other way round (out instead of in).

Some households noticed that their meters were running in reverse, but incorrectly believed that this was simply because they were generating their own electricity.  Whilst many people were warned by their solar PV installer of the possibility that their meter might run backwards, I suspect most weren’t and just thought it was ‘normal’.

Inaccurately low bills
If your electricity-supply meter runs backwards, it will show a false low reading - leading to an inaccurate bill. Some meters have even been showing negative readings, leaving households in credit. Because of this financial advantage, some households may have been tempted to stay quiet about the problem, getting free electricity on top of the savings they are making from their feed-in tariff.

As around half a million solar PV systems have been installed in the UK already, this could mean a large amount of electricity is being, or has been, consumed for free - often unknowingly. This might potentially lead to increases in electricity costs if suppliers seek to make up for unplanned losses.

What's more, solar PV customers, many of whom have been unaware that their meters are running backwards, are sometimes being landed with unexpected electricity bills retrospectively once their supplier finds out that their meter is going backwards. The bill is worked out from an estimation of what their usage would have been if their meter had been working properly.

You should be aware that the law doesn't take ignorance of an offence into account. Whilst your installer SHOULD have checked your supply meters to ensure your system wasn't interfering with your mains supply meter. Ultimately, it's down to you, as the bill paying householder to comply with the 'terms and conditions'.

Regulator Ofgem advices: 'Where a customer suspects that the installation of electricity-generating equipment has affected the operation of their import-supply meter and it is no longer accurately measuring the electricity supplied to them, they should contact their import supplier at the earliest opportunity. Once the supplier is aware that the meter may not be suitable, it is its responsibility to take any necessary steps to ensure the meter is appropriate.'

In cases where the FIT installer is the same company as the electricity supplier, internal communications should - though often don't - ensure that the supplier becomes aware that a household has an unsuitable meter.

However, it is difficult for an energy supplier to find out that this problem is occurring if the installer hasn't notified the supplier that the meter will need to be upgraded. In such cases, the supplier can only find out by doing a standard meter check - normally undertaken every two years minimum - or by analysing discrepancies in a household's monthly bills.

What do the energy suppliers say?

British Gas: 'As the majority of installs are not completed by British Gas, we therefore rely on the customer to inform us that their meter is running backwards. However, as the customer notifies us every three months of their meter reading, we are normally able to identify, at that stage, if the meter is running backwards.'

EDF: 'The initial responsibility for identification of meters that have no 'backstop' lies with the surveyor/installer of the microgeneration system. They should advise the customer on this. However, installer knowledge in this area when the FIT was introduced was limited. Microgeneration Certification Scheme installer training, accreditation and quality-assurance procedures have all been updated since introduction to include checking for meters suspected of having no backstop.'

SSE: It is the responsibility of both the energy supplier and the customer: 'SSE has a list of compliant meters that we check at the registration stage of FITs. If the customer has an incompatible meter, then we exchange it for them. In addition, we have a two-year meter read obligation. It is also suggested that consumers check their meters when they receive an estimated bill.'

Will I be billed retrospectively?
You know the answer to this already, don't you? Should your supplier find out, it has a right to charge you retrospectively...

So, if you notice your meter running backwards, it might be tempting not to tell them, as you will benefit from lower electricity bills. But beware that SHOULD the supplier find out, it has a right to charge you retrospectively for up to a year for the electricity you have used but have not been charged for.

Energy suppliers are deciding whether - and how much - to bill for energy usage retrospectively on a case-by-case basis. Most say they understand that, in the majority of cases, the customer is initially unaware of the problem. And so might, for instance, seek to recover only a proportion of the costs, worked out by looking at usage patterns after the meter has been upgraded.

However, once you have told your supplier that your usage meter is running backwards, the company has a period of one year in which to issue a bill for past usage. After this period, you don't legally have to pay a bill issued retrospectively.

I'm surprised that the anonymous contributor hasn't had a retrospective bill from his energy supplier. He states that his electricity usage has nearly trebled and his monthly 'Direct Debit' has risen dramatically. 

Hang on. His supplier is NPower, based on their appalling record with customer service, he'll probably get away with it...

Twitter: (@solaricarus)

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