E.ON is buying OVO: what it means for customers and whether you should switch

Updated: 11 May 2026

E.ON has officially announced plans to acquire OVO, one of the UK’s largest residential energy suppliers. The deal is still subject to regulatory approval, with clearance expected in the second half of 2026. Until then, E.ON says OVO and E.ON will continue to operate as independent businesses, with no change for customers during the review period and existing tariffs honoured in full.

That is reassuring. But it does not mean OVO customers should ignore the news.

A supplier takeover does not usually affect your energy supply. Your lights do not go out. Your gas does not stop. The real risk is usually more boring, and more annoying: billing changes, account migrations, delayed refunds, app changes, direct debit confusion and customer service friction.

So if you are an OVO customer, the message is simple:

Do not panic, but do not be passive.

This is a good moment to check whether your current tariff is worth keeping, whether you are holding too much credit on your account, and whether switching now would leave you better off.

This guide is written by Anton Neike, Taupia’s Co-Founder and CEO, who has worked in the energy industry for more than five years, including at E.ON Next.

Direct answer: should OVO customers switch now?

Not automatically.

If you are on a genuinely strong fixed tariff, staying with OVO may still be the best move. E.ON has said existing tariffs will be honoured during the regulatory review period.

But if your tariff is not competitive, if you are on a standard variable tariff, or if you simply do not want to sit through months of uncertainty, it is worth comparing the market now.

The key is not to guess.

Upload your latest energy bill to Taupia and we can help read the fine print, extract your unit rates, standing charges and tariff details, then compare them against the market so you can see whether you are overpaying or already on a strong deal.

Why this deal matters

OVO started life as a challenger supplier. Its original strength was being newer, more digital and more customer-focused than the old energy giants.

That changed in 2020, when OVO completed its acquisition of SSE’s household energy business. OVO went from around 1.5 million customers to almost 5 million customers almost overnight. SSE Energy Services brought around 3.5 million household customers into the group.

That kind of growth is not just about adding more customers. It brings a very different type of complexity:

• legacy billing systems
• older customer accounts
• more varied meter types
• prepayment customers
• payment plans
• debt-management cases
• vulnerable customer support
• more complex complaints handling

In other words, OVO did not just become bigger. It inherited incumbent-scale complexity.

That is the context behind this deal.

Older suppliers such as E.ON are not always more innovative, but they are built around managing large, regulated customer books at scale. That means billing operations, debt management, payment support, vulnerable customer processes and legacy account handling are part of the operating model, not an add-on.

What E.ON says will happen next

E.ON says the acquisition is about accelerating customer flexibility, including time-of-use tariffs, solar, batteries, EV charging and digital energy services. It also says OVO customers and E.ON Next customers will see no change during the regulatory review period, and that existing tariffs will be honoured in full.

E.ON has also said that, once the deal completes, it will continue OVO’s existing Kaluza platform licence for OVO’s customer base, and may evaluate wider use of Kaluza across E.ON outside the UK.

That matters because the future of energy is not just about who supplies your gas and electricity. It is increasingly about who can manage flexible tariffs, smart meters, EVs, solar panels, batteries and home energy data well.

But for most customers, the immediate question is much simpler:

Am I currently on a good deal, and is my account in order?

What I would do if I were an OVO customer today

Here is the practical checklist.

1. Download your latest bill

Your latest bill is your evidence.

It usually contains:

• your tariff name
• unit rates
• standing charges
• annual usage estimate
• meter details
• current balance
• direct debit amount
• contract end date

If accounts are migrated later, you will want a clean before-and-after record.

Even if everything goes smoothly, having the latest bill makes it much easier to compare tariffs accurately.

2. Submit a fresh meter reading

This is one of the easiest ways to protect yourself from messy estimated billing.

A fresh meter reading helps create a clean account position. It can reduce the chance of arguments later about whether your balance, final bill or opening read was correct.

If you have a smart meter, still check that your online account looks sensible. Smart meters are useful, but they do not make billing errors impossible.

3. Review your credit balance

This is a big one.

If you are hundreds of pounds in credit, consider whether that money really needs to sit with your supplier.

Ofgem says you can ask your supplier to refund credit on a live account at any time, although suppliers can refuse if they have reasonable grounds. Ofgem also says regular meter readings can help prevent credit building up unnecessarily.

This does not mean stripping your account to zero. Some credit can be useful, especially before winter or if your usage is uneven.

But if your account is heavily in credit, it is often better to review it now than risk having to chase money during a future account migration.

If you later switch supplier, Ofgem says suppliers must send a final bill within six weeks and refund any credit balance within 10 working days of that final bill. If they miss those standards, compensation may apply.

4. Check whether your tariff is actually good

This is the most important step.

A lot of customers ask: “Should I leave OVO now?”

The better question is:

“Is my current tariff worth protecting?”

If you are on a strong fixed deal, especially one below current market rates, you may not want to lose it.

If you are on a standard variable tariff, or your fix is ending soon, there may be better options available.

Ofgem says switching supplier should take up to five working days for households, and new domestic contracts can usually be cancelled within 14 days if you change your mind.

Taupia helps with the part customers usually hate: reading the bill.

You can upload your latest energy bill, and Taupia uses AI to identify the important details, including your tariff, rates and contract terms, then compares them against the market. That makes it easier to understand whether staying put is sensible or whether switching could save money.

5. Decide calmly, not emotionally

This is not about panic-switching.

It is about avoiding two bad outcomes:

1. Staying on an expensive tariff just because nothing has changed yet.
2. Leaving a genuinely good fix because the headlines feel uncomfortable.

The right decision depends on your numbers.

If Taupia shows you are already on a strong deal, protect it.

If Taupia shows you are overpaying, switching now may be better than waiting through months of uncertainty.

What are the risks for OVO customers?

The biggest risk is not supply continuity. The energy system has strong protections around keeping customers connected.

The more realistic risks are administrative:

• final bill delays
• credit refund delays
• app or login changes
• confusing account communications
• estimated billing
• direct debit changes
• slower complaints handling during transition periods

None of these are guaranteed. E.ON may handle the process well.

But customers should not wait until there is a problem to get organised.

What if I have debt on my OVO account?

If you owe money, switching may still be possible, but it depends on your situation.

Ofgem says you can switch if you owe money to your supplier and have been in debt for less than 28 days. If the debt is older than that, you may need to repay it before switching. Prepayment customers may still be able to switch with debt up to £500 for gas and £500 for electricity.

If you are in debt or on a payment plan, do not ignore the situation. Check your account, speak to your supplier if needed, and compare options carefully before making a move.

What if I am on a fixed tariff?

If your fixed tariff is genuinely competitive, staying may be the best decision.

Before switching away, check:

• your unit rates
• your standing charges
• your end date
• exit fees
• how your current deal compares with new tariffs

A fixed tariff can be valuable if market prices rise. But not every fixed tariff is a good deal, and some customers stay on poor fixes simply because they assume “fixed” means safe.

Taupia can help you compare your fixed tariff against current market options so you know whether it is worth keeping.

What if I have a large credit balance?

If your balance is high, ask three questions:

1. Is the balance based on actual meter readings or estimates?
2. Is the credit reasonable for the time of year?
3. Would I be comfortable if this money got caught in admin delays later?

If the answer is no, submit a fresh meter reading and consider requesting a partial refund.

Ofgem confirms that credit can build up when customers pay fixed direct debits, use less energy than expected, or suppliers estimate usage too high.

Your money should not sit on an energy account just because you have not checked it.

The five-minute OVO customer checklist

If you do nothing else today, do this:

1. Download your latest OVO bill.
2. Submit a fresh meter reading.
3. Screenshot your account balance.
4. Check your direct debit amount.
5. Upload your bill to Taupia and compare your tariff.

That gives you control.

Why Taupia is useful right now

Most people do not know their real energy tariff details.

They know roughly what they pay each month, but not the unit rates, standing charges, annual consumption, contract end date or exit fees. That makes it hard to know whether switching is worth it.

Taupia uses AI to help customers read their energy bill, extract the key tariff details and compare them against the market.

That means you do not need to manually decode your bill or guess whether your current supplier is still giving you a good deal.

You can simply upload your bill, review your options and decide whether to stay or switch.

Bottom line

E.ON buying OVO is now official, but the deal still needs regulatory approval.

E.ON says nothing changes for customers during the review period and existing tariffs will be honoured. That is good news.

But uncertainty still has a cost.

If you are an OVO customer, now is the right time to get your account in order, check your balance and compare your tariff.

Do not panic.

Do not wait passively.

Make the decision based on your own numbers.

Compare your OVO tariff now

Upload your latest energy bill with Taupia and see whether your current tariff is still competitive.

If your deal is good, protect it.

If it is not, switch on your own terms.

If you want to compare UK deals manually first, start with Taupia’s energy comparison page.