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Updated: 11 Mar 2022


Eon is one of the UK’s largest energy companies. Find out whether Eon is the best gas and electricity supplier for you, as revealed by its customers.
Sarah Ingrams
Eon big six 480404

Eon is owned by German company Eon SE. It's one of the UK’s largest electricity generators and owns power stations, wind farms and biomass plants.

It's also one of the largest energy suppliers in Great Britain, providing energy to around 3.8 million homes and businesses. 

Eon says it aims to lead the global shift towards new technology and be more sustainable. It sells solar panels and home batteries, and it is installing electric vehicle charging points across the country.

Eon also launched Eon Next in March 2020, following the acquisition of Innogy, Npower's parent company. Npower customers were the first to be migrated onto Eon Next and in May 2021 two million more customers were migrated. 

See whether Eon will save you money on energy – use Which? Switch to compare gas and electricity prices.

An Eon energy electric car on charge

Eon customer review

Eon came joint-eleventh out of the 16 energy companies rated by 8,390 members of the public in the annual Which? customer survey. It ranks jointly with SSE, Sainsbury's Energy and Scottish Power this year, behind British Gas and EDF Energy but ahead of its own new platform, Eon Next. 

It’s still far behind rival Ovo Energy, showing there’s plenty of room for improvement.

Not the best but not the worst

Eon customer

They are ok but would be nice if they were cheaper!

Eon customer

Eon score

The table below shows the breakdown of its score from our latest survey.

Scroll down to find out how long it took to answer the phone to its customers in our snapshot investigation, if live chat is faster and our full verdict on Eon.

Customer score55%
Customer service
Bill accuracy
Bill clarity
Value for money

Based on a survey in September 2021 of 978 Eon customers.

Find out how Eon compares with other energy companies – head to the full results of the best and worst energy companies.

Eon van parked in a driveway

Which? verdict on Eon

Pros: The majority of customers didn't have a reason to complain to Eon in the year before the survey

Cons: Slow to answer the phone to its customers; live chat sometimes wasn’t available in our investigation update 

Eon scored a disappointing two stars out of five for bill accuracy, bill clarity, customer service and value for money. Customers of the highest-scoring brand achieved four stars for the same four measures. 

Eon is jointly ranked with SSE and Scottish Power, both of which scored the same for bill accuracy and value for money. 

There is always room for improvement

Eon customer

Average service, but no real issues

Eon customer

Eon was rated slightly higher than Scottish Power for value for customer service – its customers gave it two stars versus Scottish Power's one. 

But Sainsbury's Energy, who also ranked tenth scored higher than all three firms for value for money (three stars).

Eon's tariff range includes an online-only tariff with 25% off boiler cover and one exclusively for electric and hybrid vehicle owners, which gives customers a £30 reward equivalent to 850 miles of electricity after you've had the tariff for six months.

Eon's complaints 

Just over one in 10 (11%) of Eon customers told us they felt they had reason to complain about the energy firm between October 2020 and October 2021. 

Of its customers that did complain, over two-thirds (36%) did so about their bills or statements and 39% of these financial complaints were regarding inaccurate bills or statements.

Eon's customer service

Eon received just two stars for its customer service in our survey conducted in October 2021.

More than half (55%) of its customers told us its customer service was good and close to two-thirds of its customers shared that they were satisfied with Eon overall.

Can I join Eon with a prepayment meter?

Yes, you can join Eon with a prepayment meter and it's installing smart prepayment meters

Smart pay-as-you-go meters mean you can top-up without going to the shop.

Eon's standard prepayment meters can be topped-up at your nearest Post Office, PayPoint or Payzone outlets.

You can get £5 of emergency credit if you can't get to a shop to top-up. You can activate this from your meter and will pay back what you use the next time you top-up.

Does Eon sell renewable energy?

Eon generates a small amount of the renewable electricity used by its customers and buys around a third directly from renewable generators. It also buys renewable energy certificates to match more of its customers’ use with renewable power.

Proportion of renewable electricity sold to domestic   customersGenerates renewable electricity?Buys renewable electricity directly from generators?Proportion of customers’ renewable electricity matched by REGO certificates?Generates or buys directly from fossil fuels?Sells green gas?
81.9%Yes (3%)Yes (33%)33% and 20% backed by GoOsNoNo

Proportion of renewable electricity according to Eon’s 2020/21 fuel mix. Other responses based on information provided by suppliers in August and September 2021.

Some 81.9% of Eon’s electricity fuel mix is renewable, 1.8% is nuclear and the remainder comes from fossil fuels. 

The renewable electricity it generates is from biomass, which it says is fuelled by responsibly sourced waste and recycled wood. Eon’s Sheffield site uses locally sourced waste wood which otherwise would have gone to landfill. 

Eon also buys around a third of the electricity used by its customers from renewable generators. It says it helped generate many of its supply sites over the last decade. 

This doesn’t match every customer’s use though – a fifth of its electricity is matched with renewable power generated outside the UK, in Europe, using Guarantees of Origin (GoOs).

Find out more about the differences between energy companies’ renewable electricity.

Eon in the news

Eon in 2021

April: Eon will pay out £650,000 after taking 1.6m customers' direct debits early last Christmas, energy regulator Ofgem announced.

So far Eon has paid £55,039 in goodwill payments to customers who told it they had paid extra bank charges, expenses that left them out of pocket or other financial problems as a result of Eon taking their payments early.

You can still claim compensation from Eon if your direct debit was taken early and you suffered financially as a result. Most of the affected direct debits were meant to be taken in January 2021 but were taken on 24 December 2020 instead.

Eon says the payments were taken early due to a technical fault. This followed Eon changing friendly credit hours for prepayment customers between Christmas and New Year.

'Eon failed to conduct the appropriate checks to ensure that this did not lead to any unintended consequences for customers', Ofgem said.

Eon will also pay over £600,000 into Ofgem's fund to help energy customers in vulnerable situations.

March: Around 28,000 Eon customers are being paid a total of £238,000 after they were overcharged when they switched supplier or tariff between 2013 and 2020. It was one of 18 energy firms found by regulator Ofgem to have failed to uphold these rules. Over 1 million customers were affected.

Eon's affected customers will receive £8.49 each, on average.

Eon in 2020

December: Eon took around 1.5m customers' direct debits up to two weeks early meaning some paid for energy twice in one month. Eon explained that an IT issue caused the problems and it would process refunds automatically.

March: Eon's results revealed it lost 500,000 customers in 2019 as more households switched away from the traditional big firms.

See how much money you can save on your energy bill. Use Which? Switch to find the cheapest gas and electricity.