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Energy company reviews


Article 10 of 33

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Engie sells gas, electricity and energy services and says it offers a ‘fairer, smarter, greener way’ to get energy.

When Engie started supplying homes in May 2017, it was the largest company to enter the UK domestic energy market in 15 years. It now supplies around 75,000 homes.

Formerly called GDF Suez and founded in France, Engie is a global energy supplier and generator, and owns a hydropower station in North Wales.

All of Engie's tariffs are backed by 100% renewable electricity. It also offers a tariff with 100% renewable gas. Another tariff comes with a smart thermostat.

Read on to find out what customers think of Engie. Use Which? Switch to compare gas and electricity prices to find out whether you could get a good-value deal.

Engie customer score

Engie came joint 12th (with Boost Energy) out of 30 energy companies in England, Scotland and Wales, rated by 7,429 members of the public in the annual Which? energy companies customer satisfaction survey.

Customers were most positive about Engie’s tariffs being good value for money, although we didn’t receive enough responses to rate all aspects of its service.

Engie score breakdown

The graphic below shows the breakdown of Engie’s scores from our latest survey.

Find out how Engie compares with other energy companies included in our survey. See the full results of the best and worst energy companies.

Which? verdict on Engie

It’s the first time we’ve included Engie in our energy customer survey and it scores reasonably well on those areas for which we received enough responses to rate.

Customers were most impressed with Engie’s value for money, rating it a full five stars out of five. Several companies which scored higher overall were not rated as well as Engie for being good value. 

Accuracy and clarity of Engie’s bills were also rated reasonably well by customers.

We didn’t receive enough responses to rate its online or phone customer service or comment on this.

However, our undercover customer waiting investigation in September 2019 found that Engie was one of the slowest firms to respond when we submitted queries via its online form. It took more than four days on average to respond, while the fastest firm took just 29 minutes.

Engie had one of the lowest level of complaints out of any company we checked*. 

It wasn’t the fastest to resolve them, however, sorting less than 60% of them within two working days. The best companies manage more than 80% in this time.

Engie has committed to rolling customers on to its cheapest equivalent tariff when their fixed deal ends. It calls this its ‘rate rollover promise’.

Pros: Customers find it good value for money and it gets few complaints

Cons: Not the fastest to resolve complaints, nor respond to emails

*(We checked complaints data for all firms included in our satisfaction survey for the first six months of 2018. Source: Ofgem and energy suppliers.)

Engie electricity sources