E.ON in a nutshell

  • E.ON is one of the cheaper Big Six energy suppliers.
  • It is one of the suppliers that relies least on renewable energy (coal-based fuel mix).
  • E.ON’s complaints performance is the fastest of the Big Six.

E.ON, a subsidiary of the world’s largest investor-owned power and gas company

Originally, E.ON was an entirely public utilities company: Powergen was founded in 1989. It was partly privatised in 1991 (60%) and the remaining shares were sold to private investors in 1995. The German company E.ON bought Powergen in 2002. Two years later, it was rebranded E.ON UK.

E.ON corporate data

A member of the German group E.ON, E.ON UK employs 12,000 people and made £ 9.22 billion in revenue (2011). The company supplies electricity and gas to over 5 million residential and business customers (10% of the domestic and small business energy market) and controls coal, wind and CHP generation capacity. E.ON UK’s CEO is Tony Cocker.

E.ON is a vertically integrated electricity and gas company

E.ON has interests in electricity generation and natural gas production:

  • Through combined heat and power, coal-fired and wind power stations, E.ON accounts for almost 10% of the electricity generation capacity in the UK.
  • Through E.ON Gas Storage UK's ownership of the Holford natural gas storage facility, the company accounts for 3.5% of the UK's storage capacity, though it is building a new storage facility in Whitehill, which will triple its storage capacity.

The E.ON fuel mix relies mostly on coal and natural gas

Given its ownership of large coal and natural gas generation facilities, E.ON’s fuel mix relies unsurprisingly on coal and natural gas (close to 83%), as shown in this graph:

Current E.ON energy prices

The following table shows average E.ON energy prices (based on an annual usage of 3,200 kWh for electricity and 13,500 kWh for gas) by tariff as of June 2014. Standard comparison rates place E.ON in an average position when it comes to electricity and gas prices (halfway between the cheapest and the most expensive dual-fuel plan), and early exit fees are relatively low, when they exist at all.



Average cost duel fuel

E.ON Energy Plan

- Variable tariffs
- No contract end date or renewal

£ 1169.60

E.ON Energy Fixed 1 Year v6

- Fixed price for 1 year
- £ 10 exit fee (£ 5 per fuel)

£ 1140.68

E.ON Energy Fixed 2 Year v5

- Fixed price for 2 years
- £ 20 exit fee (£ 10 per fuel)

£ 1192.93

Age UK Fixed 2 Year

- Fixed price for 2 years
- No exit fee
- Available to people over 60

£ 1192.93

Contacting E.ON

Contacting E.ON by telephone

Depending on what topic customers need assistance on, E.ON has several contact numbers available. Operating hours are good compared to most other Big Six suppliers.


Contact number

Operating hours

Account enquiries

0333 2024 606
0333 202 4610 (new customers)
0345 303 3040 (prepayment)

Mon-Fri, 8am-8pm; Sat, 8am-6pm

Moving home

0333 202 4643 (prepayment)
0345 303 3020 (credit meter)
0345 366 5976 (smart meter)

Mon-Fri, 8am-8pm; Sat, 8am-6pm


0333 2024 606

Mon-Fri, 8am-8pm; Sat, 8am-6pm

Energy efficiency

0333 202 4650

Mon-Fri, 8am-6pm

National Gas Service Emergency Line

0800 111 999



Contacting E.ON by mail

Letters to E.ON can be sent to the following address:
PO Box 7750

E.ON customer reviews

E.ON complaints performance

Through 2014’s first quarter (Jan-March), customers sent E.ON 239,440 complaints. Of these, 232,014 complaints (87.8%) were resolved in less than a day. Most complaints are about customer service (42%), though almost a third (29%) were about bills and letters. The remaining complaints concerned metering (13%), payments (12%) and systems (2%). Compared to other Big Six suppliers, E.ON is the quickest to resolve complaints within the next working day.

What customers say about E.ON

Selected positive reviews about E.ON

  • E.ON is helpful when things go wrong

“When our boiler stopped working, I was happy to discover that we were eligible for a new one.”

  • The E.ON Age UK tariff is competitive

“As a pensioner, I find the E.ON Age UK two-year fixed tariff relatively competitive compared to the other suppliers.”

  • E.ON customer care is responsive

“So far, my phone queries get answered and when they can’t, E.ON customer care investigates further and usually gets back to me.”

Selected negative reviews about E.ON

  • E.ON is better at being paid than paying back

“I thought direct debit would be a convenient way of paying my energy bills but when I moved out and realised that I was in credit with E.ON, it took three months before I was paid back what I was owed.”

  • E.ON boiler inspection hours are incompatible with a working life

“When I needed my first boiler inspection I gave E.ON dozens of dates that suited but kept getting offered dates and times that are incompatible with work. Few people can stop working in the middle of the day for a boiler inspection.”