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, after it gained around 50,000 new customer accounts last year. It provides energy to around 4.3 million homes and businesses. And this may be set to grow as Eon now owns the majority of Innogy, Npower's parent company.
Eon says it aims to lead the global shift towards new technology and be more sustainable. It sells solar panels and home batteries, and is installing electric vehicle charging points across the country.
Eon customer score
Eon came joint-24th out of the 35 energy companies, rated by 7,355 members of the public in the annual Which? customer survey. It ranks jointly with and this year, ahead of British Gas and Scottish Power.
Eon score breakdown
The graphic 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.
Which? verdict on Eon
Eon scores a respectable three stars out of five in four categories of six in our survey. That’s not bad, but customers of the highest-scoring brands achieved four stars or more. Jointly ranked SSE scored better (four stars) for customer service, but Eon’s rating for bill accuracy was higher.
Eon customers’ responses gave it a four-star rating for how it handles complaints too. Data from energy regulator Ofgem reveals that while Eon gets a high number of complaints per 1,000 customers compared with other firms, it solves the majority within eight weeks.
Eon’s customer service doesn’t stand out from the crowd, according to our survey.
That’s far from the fastest pick-up time (So Energy took an average of just 38 seconds), but far quicker than rival Scottish Power, which took more than 21 minutes to pick up the phone, on average.
Eon offers live chat on its website, and our investigation found it was faster to get a response from a human in this way – 4mins 36secs, on average. But live chat wasn't available a few of the times we tried, and other firms were far quicker – the fastest took less than a minute, on average, to respond.
Its tariff range includes an online-only tariff, a deal including boiler cover, and a tariff exclusively for electric and hybrid vehicle owners that gives customers a £30 reward for the equivalent of 850 miles of electricity.
Eon sometimes offers competitive dual-fuel tariffs, although customer opinions are mixed about its value for money.
All of its household customers get tariffs backed by 100% renewable electricity. However, the average for Eon’s domestic and small business customers overall is 27% renewable.
Pros: Offers competitive fixed tariffs sometimes, rewards electric vehicle drivers
Cons: Fairly slow to answer the phone to its customers, live chat sometimes wasn’t available in our investigation