Got the wrong bill from OVO Energy? Here is how to fix it.
This guide explains who OVO Energy is, the 2024 Ofgem fine for ignoring complaints (which gives you extra leverage), how the old SSE Energy Services takeover can affect your bill, and how to send OVO a proper complaint letter by Royal Mail.
About OVO Energy Limited
OVO Energy is a UK energy supplier based in Bristol. It was founded in 2009 by Stephen Fitzpatrick, a Northern Irish entrepreneur from Belfast, along with his wife Sophy. The two of them spent five years getting an Ofgem supply licence and saved £350,000 to start the business. Fitzpatrick has said he was frustrated by how unclear and expensive the UK energy market was, so he wanted to build a fairer, simpler alternative. OVO began trading in September 2009 and grew steadily until 2017, when they had around 680,000 customers.
OVO got much bigger in January 2020 by taking over the entire UK retail business of SSE plc (the company that used to be Scottish and Southern Energy). About 3.5 million SSE customers transferred to OVO. That deal made OVO the UK's third largest household energy supplier overnight. Today OVO has around 4 million customers. The parent company is OVO Group Ltd, based at The Core, 40 St Thomas Street in Bristol. OVO is privately owned (not listed on a stock market). In January 2025 OVO bought the brand name from Stephen Fitzpatrick in a £150 million deal.
The current CEO is David Buttress, who used to be the founder and CEO of Just Eat (the food delivery company). Buttress became CEO in January 2025, taking over from Raman Bhatia (who left to become the CEO of Starling Bank). Stephen Fitzpatrick stepped back from the holding company board but is still involved. OVO also owns Boost (a prepayment-only brand) and Spark Energy Ltd (a smaller supplier acquired in November 2018). The company has had problems with customer service in recent years, and was fined £2.37 million by Ofgem in September 2024 for failing to handle complaints. More on that below.
Registered office
OVO Energy Limited1 Rivergate, Temple Quay
Bristol
BS1 6ED
United Kingdom
Companies House number: 06890795 · Incorporated: 29 April 2009 · Parent: OVO Group Ltd (Companies House 06890468) · Regulator: Ofgem (Office of Gas and Electricity Markets) · Ombudsman scheme: Energy Ombudsman (run by Ombudsman Services)
Group structure
OVO Group Ltd (parent)
This is the holding company that owns all the OVO businesses. Companies House number 06890468. Registered office is The Core at 40 St Thomas Street, Bristol BS1 6JX. OVO Group is privately owned (not listed on a stock market). Major investors include Mayfair Equity Partners. Stephen Fitzpatrick was the original founder and majority owner, but his role on the group board ended in January 2025 as part of a £150 million brand transfer deal.
Companies House 06890468.OVO Energy Limited
This is the main OVO Energy supplier that runs the OVO brand for new and existing customers. Companies House number 06890795. Registered office at 1 Rivergate, Temple Quay in Bristol. Ofgem granted it a fresh electricity supply licence on 18 October 2023. If your bills come from "OVO Energy" and you joined OVO as an OVO customer (not by SSE migration), your contract is with this company.
Companies House 06890795. Ofgem-licensed.The OVO (S) entities (former SSE Energy Services)
When OVO took over SSE Energy Services in January 2020, the legal entities were renamed but kept going. OVO (S) Gas Limited (Companies House 02716495) used to be called Southern Electric Gas Limited. OVO (S) Electricity Limited (Companies House 04094263) used to be a Southern Electric company. So if your account history goes back to SSE, the legal entity is technically one of the "OVO (S)" companies, not OVO Energy Limited. This matters if you are sending a legal letter or claim about an old SSE-era bill.
Two separate legacy SSE entities, retained.Boost, Spark Energy and the other OVO brands
Boost is OVO's prepayment-only brand. Spark Energy Ltd was acquired in November 2018 after Spark went bust. About 235,000 Economy Energy customers also came to OVO in January 2019 after Economy Energy collapsed. So there are several different paths your account can take through the OVO group depending on when you became a customer and from which supplier you transferred.
Common reasons your OVO Energy Limited bill might be wrong
- 1Old SSE migration issues. If you were an SSE Energy Services customer before January 2020, your account moved to OVO when the takeover completed. Migration between billing systems is risky. Old meter readings, direct debit dates, account credit balances, and tariff details sometimes do not transfer correctly. The closing balance on your last SSE bill MUST match the opening balance on your first OVO bill exactly.
- 2The smart meter has not been sending readings. This is the biggest single cause of wrong bills across all UK energy suppliers. OVO then bases the bill on an estimate. You can check by taking your own meter reading and sending it to OVO.
- 3You were back-billed for more than 12 months. Standard Licence Condition 21BA says OVO CANNOT charge you for energy used more than 12 months ago if the missed billing was THEIR fault. This is explained in detail below.
- 4Your complaint was ignored or delayed. OVO was fined £2.37 million by Ofgem in September 2024 for failing to handle 1,395 customer complaints properly, some with delays of up to 18 months. If your complaint has been sitting unresolved for months, you may have an extra angle to push.
- 5Direct debit went up without proper justification. OVO has to give you fair notice and a clear breakdown if they want to raise your monthly payments. Big unexplained jumps can be challenged.
- 6A previous tenant's debt was added to your account. If you moved into a new property, debts run up by previous occupants are NOT yours. You only owe OVO for energy used since you moved in.
The energy billing rules that protect you
| Rule | What it means | Source |
|---|---|---|
| 12-month back-billing rule | If your energy supplier did not bill you accurately because of their own mistake, they cannot now charge you for energy used more than 12 months ago. | Standard Licence Condition 21BA (domestic), SLC 7A (microbusiness). In force since 1 May 2018. |
| Standards of Conduct | Suppliers must treat you fairly, give you clear information, and make sure billing is accurate. | SLC 0 and 0A. |
| Priority Services Register | If you are vulnerable, you get extra protections including more regular meter reads. | SLC 26. |
| Default Tariff Cap | Limits the amount per unit and standing charge if you are on a default or "standard variable" tariff. | Reset every quarter by Ofgem. |
OVO Energy is signed up to all of these rules because they hold UK gas and electricity supply licences from Ofgem. The back-billing rule (Standard Licence Condition 21BA) is particularly important for OVO customers because of the 2020 SSE takeover and the ongoing complaint handling issues that Ofgem fined the company for in 2024.
The 2024 Ofgem complaint handling action and what it means for you
In September 2024, Ofgem ordered OVO Energy to pay £2.37 million for failing to handle customer complaints properly. The action was reported as a "fine" but technically it was an "alternative action" payment under Ofgem's enforcement powers. £378,512 went directly to 1,395 affected customers (an average of £271 per customer). Another £2 million went to the Energy Industry Voluntary Redress Scheme, which helps vulnerable energy customers across the country.
What Ofgem found was serious. OVO had been sitting on customer complaints for up to 18 MONTHS without resolving them. Citizens Advice Scotland's Extra Help Unit (a service that helps vulnerable energy customers) said OVO was its biggest source of unresolved cases. The Energy Ombudsman, which makes binding decisions in energy disputes, said OVO had been failing to implement remedies it had ordered. Ofgem found these were breaches of Standard Licence Condition 0 (Standards of Conduct) and Standard Licence Condition 4A (which requires suppliers to have robust systems for serving customers).
What this means for you: if your complaint to OVO has been ignored, delayed for more than 8 weeks, or if OVO has not followed an Energy Ombudsman decision, you have specific leverage. Reference the September 2024 Ofgem enforcement decision in your letter. Demand confirmation that your complaint is being handled in line with the improved systems OVO promised to put in place. If OVO still does not respond, you can both escalate to the Energy Ombudsman AND report the failure to Ofgem as evidence that OVO's remediation has not worked.
Your rights
Standard Licence Condition 21BA (the back-billing rule)
This is the big one. OVO Energy cannot bill you for gas or electricity used more than 12 months ago if OVO was at fault for not billing accurately. The rule lives in the Standard Conditions of Electricity Supply Licence and the Standard Conditions of Gas Supply Licence, both made under the Electricity Act 1989 and the Gas Act 1986. It has been in force since 1 May 2018.
Standard Licence Conditions 0 and 0A (Standards of Conduct)
These set out broad rules about how OVO has to treat you. They have to be fair, give you clear information, use plain language, and make sure billing is accurate. These are the rules OVO breached in the 2024 complaint handling case.
Standard Licence Condition 4A (robust internal systems)
This rule says OVO must have systems and processes that can serve customers efficiently, identify risks of consumer harm, and comply with the law. The 2024 Ofgem action found OVO had been falling short on this rule. If your complaint has been mishandled or ignored, you can quote this licence condition as part of your argument.
Standard Licence Condition 21B and 21BA (your bill must be accurate)
OVO has to take all reasonable steps to base your bills on actual meter readings. If they only have estimated reads, they have to clearly mark the bill "estimated" and try to get an accurate read. If they have a smart meter that is sending readings, they must use the actual readings.
Standard Licence Condition 31I (direct debit changes)
If OVO wants to put your monthly direct debit UP, they have to give you fair notice and a clear breakdown of why. Big unexplained jumps can be challenged.
Energy Ombudsman decisions are legally binding
If your case has been to the Energy Ombudsman and a remedy has been ordered, OVO has 28 days to implement it. Failure to do so was one of the main issues Ofgem fined OVO for in 2024. If OVO has not implemented an Ombudsman remedy in time, that is a breach of the supplier's obligations and you can demand compliance directly.
How long do you have to challenge a bill?
The Limitation Act 1980 gives you 6 years to bring a court claim about a contract dispute in England, Wales and Northern Ireland (5 years in Scotland). For SSE migration issues that go back to January 2020, that 6-year clock is now ticking. Act sooner rather than later.
Common OVO Energy Limited situations
Your old SSE Energy Services account did not migrate correctly
The closing balance on your last SSE bill should match the opening balance on your first OVO bill exactly. If you had SSE credit that disappeared, an SSE debt that grew unexpectedly, or meter readings that do not line up around the January 2020 transfer date, the migration is at fault. Quote your SSE account number, the migration date, and demand a full reconciliation. Mention that legally the entity is now OVO (S) Gas Limited (02716495) or OVO (S) Electricity Limited (04094263) for SSE-era issues, not just "OVO Energy".
OVO has been sitting on your complaint for weeks or months
This is exactly what Ofgem fined OVO £2.37 million for in September 2024. If your complaint has been unresolved for more than 8 weeks, you have a strong case. Send a formal letter referencing the 2024 Ofgem enforcement action and demanding a final response within 14 days. After 8 weeks total, you can escalate to the Energy Ombudsman for free, and to Ofgem if OVO still does not respond. Ofgem watches OVO closely after the 2024 action.
The Energy Ombudsman ruled in your favour but OVO has not paid
Energy Ombudsman decisions are legally binding. OVO has 28 days to implement them. This was the other major issue in the 2024 Ofgem action: OVO was sitting on Ombudsman decisions and not actioning them. If this has happened to you, write to OVO with the Ombudsman case reference and demand immediate implementation, citing the 2024 Ofgem ruling. Then report the failure to Ofgem as fresh evidence that OVO is still not compliant.
You got a huge catch-up bill after months of estimates
This is the classic SLC 21BA case. If OVO has been sending you estimated bills and then suddenly sends a corrected bill for more than 12 months of usage, write to them quoting SLC 21BA. Ask them to cap the bill at the 12 months immediately before the corrected bill date. The earlier part has to be written off.
Your smart meter has not been sending readings
Smart meters sometimes lose their signal. When that happens, OVO's system uses estimates. The first thing to do is take a manual reading and send it to OVO. If they failed to spot the problem for many months and now want to back-bill you, the back-billing rule applies.
Your direct debit went up sharply
OVO has to follow SLC 31I when changing your direct debit. They must give fair notice and a clear breakdown of why. If your usage has not changed but your monthly direct debit went up a lot, demand a written explanation.
You are a Boost (prepayment) customer with a billing dispute
Boost is OVO's prepayment-only brand. Boost customers are still covered by the same legal protections (SLC 21BA, Standards of Conduct, Energy Ombudsman) but the day-to-day complaint route goes through Boost's own customer service first. If Boost does not resolve the issue, you can still escalate to the Energy Ombudsman in the same way as other OVO customers.
Send your OVO Energy Limited complaint by Royal Mail
PostRight writes your formal complaint letter for you. Answer a few simple questions. Check the letter. Pay. We print it and post it by Royal Mail the next working day. A real letter creates a clear paper trail that matters for back-billing claims and Energy Ombudsman escalation.
- ✓Cites Standard Licence Condition 21BA where the back-billing rule applies
- ✓References the September 2024 Ofgem complaint handling action where relevant
- ✓Quotes the Consumer Rights Act 2015 where service was not properly carried out
- ✓States exactly what you want OVO to do (refund, recalculation, balance correction)
- ✓Gives OVO a clear 14-day deadline to reply
- ✓Printed on quality paper and posted by Royal Mail. From £2.79.
Frequently asked questions
What was the 2024 Ofgem action against OVO about?
In September 2024, Ofgem ordered OVO to pay £2.37 million for failing to handle customer complaints properly. £378,512 went directly to 1,395 affected customers (about £271 each on average). £2 million went to the Energy Industry Voluntary Redress Scheme. The main failings were: complaints sitting unresolved for up to 18 months, and OVO failing to implement decisions made by the Energy Ombudsman within the required 28 days. If your complaint has had similar issues, reference the 2024 ruling in your letter.
I was an SSE customer before 2020. Is my old account history still good?
Yes. When OVO bought SSE Energy Services in January 2020, the legal entities were renamed but kept all the old account history. OVO (S) Gas Limited (Companies House 02716495) used to be Southern Electric Gas Limited, and OVO (S) Electricity Limited (Companies House 04094263) used to be a Southern Electric Gas Power Limited entity. So if OVO claims they cannot find your old SSE records, that is THEIR problem — the legal company never changed, just the name on the door.
What is the back-billing rule and does it apply to OVO?
Yes, it applies to every UK gas and electricity supplier including OVO. Standard Licence Condition 21BA says that if OVO failed to bill you accurately because of their own mistake, they cannot now charge you for energy used more than 12 months ago. So if you suddenly receive a catch-up bill for 18 months or two years of energy, write to OVO quoting SLC 21BA and demand the bill be capped at 12 months.
How do I escalate to the Energy Ombudsman?
First make a formal complaint to OVO in writing. They have 8 weeks to resolve it. If they refuse or you have a final "deadlock" letter, you can take the case to the Energy Ombudsman at energyombudsman.org or by calling 0330 440 1624. The service is free for customers and binding on OVO. The Ombudsman can order OVO to pay you compensation, write off charges, or apologise.
What if OVO has been ignoring my complaint for months?
This is exactly the issue Ofgem fined OVO for in 2024. After 8 weeks of no proper response, take the case to the Energy Ombudsman free of charge. You can also report OVO directly to Ofgem (the regulator) given the recent enforcement history. Ofgem cannot resolve your individual complaint but they monitor OVO closely and your case adds to the compliance evidence.
My smart meter stopped sending readings. Whose fault is that?
Smart meter signal problems are usually the supplier's responsibility. OVO has a duty to monitor data and fix problems they spot. If your meter stopped sending readings and OVO failed to notice for many months, that is THEIR fault, not yours. You can use the 12-month back-billing rule.
Can I get OVO to refund a credit balance to my bank?
Yes. If your OVO account is in credit (you have paid more than you used), you can ask for the credit to be refunded to your bank account. The money is yours.
How long do I have to make a complaint?
There is no strict deadline for raising a complaint directly. But two important time limits apply. The 12-month deadline applies for taking a case to the Energy Ombudsman: you have to escalate within 12 months of getting OVO's final response. The 6-year deadline applies for going to court (5 years in Scotland) under the Limitation Act 1980. For SSE migration issues from January 2020, this 6-year window is now ticking down.
Free help and what to do next
Energy Ombudsman
Free, binding dispute resolution for energy customers. After 8 weeks of unresolved complaint or a final response from OVO, take your case here. Decisions are binding on OVO within 28 days. Free for you to use. Helpline: 0330 440 1624.
Visit website →Ofgem (the regulator)
The UK energy regulator. Does not handle individual complaints but enforces the licence conditions. Ofgem took the £2.37 million action against OVO in September 2024 for complaint handling failures. Worth reporting persistent bad behaviour to add to the enforcement record.
Visit website →Citizens Advice Extra Help Unit (for vulnerable customers)
Run by Citizens Advice Scotland but covers all of Great Britain. The Extra Help Unit helps vulnerable energy customers when their supplier is not resolving complaints. The EHU was the body that first raised concerns about OVO's complaint handling that led to the 2024 Ofgem action. Helpline: 0808 196 8660.
Visit website →Money Claim Online (MCOL)
The online court service for England and Wales. Use this if OVO refuses to follow an Ombudsman decision, or to sue OVO directly. You have 6 years from the date of the disputed bill to sue (5 in Scotland).
Visit website →Ready to challenge your OVO Energy Limited bill?
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