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Updated: 21 Oct 2021

Sainsbury's Energy

Sainsbury's Energy is a partnership with Eon Next. Find out how customers rate the service.
Tom Morgan

Sainsbury's Energy is a trading name of Eon Next, part of big energy firm Eon. It says it's the only energy provider that's part of the Nectar scheme so you can earn points by being a customer.

Sainsbury's Energy sells dual fuel plans (gas and electricity), electricity-only plans and gas-only plans lasting one or two years. New customers will make fixed payments with the group's Fix & Reward tariff, which means you pay the same amount every month. There's a £30 exit fee if you decide to cancel before the end of the contract.

Previously Sainsbury's Energy was a partnership with Npower. Npower's customers were moved to Eon Next in 2021. Before that, Sainsbury's Energy was a partnership between the supermarket and British Gas.

Find out whether you're on the best energy deal for you by using Which? Switch to compare gas and electricity prices.

Sainsbury's Energy customer score

We spoke to 7,460 survey respondents to find out exactly what they thought of their energy supplier. Sainsbury's Energy finished in 9th place for customer score, outscoring a selection of big-name energy suppliers including Ovo, Green Energy and Utility Point.

When we conducted our survey, Sainsbury's Energy was a partnership with Npower. Now it's teamed-up with Eon Next.

Competitive prices from an established company.

Sainsbury's Energy customer

They are competitive with other suppliers and also offer me nectar points with my energy usage.

Sainsbury's Energy customer

Sainsbury's Energy score breakdown

The graphic below shows the breakdown of Sainsbury's Energy's score from our survey.

Find out how Sainsbury's Energy compares with other energy firms – head over to our Which? energy survey results.

Which? verdict on Sainsbury's Energy

Finishing with a customer score of 70%, Sainsbury's Energy sits in the top half of our table of energy suppliers. Although the brand couldn't outscore competitors including Avro Energy, Pure Planet and So Energy, we still saw plenty of customers full of praise for Sainsbury's Energy.

Based on the feedback we received in our survey, the vast majority of Sainsbury's Energy customers are satisfied with the accuracy of their bills. In fact, the group scored four stars in our survey for bill accuracy, with one customer telling us their current bill was 'far better' than the one they received from their previous energy supplier.

I've never had a problem [with bill accuracy].

Sainsbury's Energy customer

[The bill] is clear and simple to understand.

Sainsbury's Energy customer

Sainsbury's Energy also scored four stars for bill clarity, suggesting that the brand does a good job of avoiding jargon when communicating with its customers. One survey respondent took the opportunity to mention the Energy Saving Mobile App, describing it as 'very clear and understandable'.

Judging by the results of our survey, most Sainsbury's Energy customers are satisfied with the value they're getting from the service. The supplier scored four stars for value for money – only one energy supplier in our full list managed to score a maximum five stars in this category.

Competitive prices from an established company.

Sainsbury's Energy customer

They are competitive with other suppliers and also offer me Nectar points with my energy usage.

Sainsbury's Energy customer

If you switch to Sainsbury's Energy from your current supplier, you'll be rewarded with Nectar points. Customers that switch both their gas and electricity to Sainsbury's will get 'triple Nectar points every time they shop with Sainsbury's'. Those points can be spent on treats from Nectar partners including Argos and Vue Cinemas.

Signing up with Sainsbury's Energy means you will be able to manage your account online or with the free mobile app. Customers can compare their energy use with previous days, weeks or months and send meter readings 'in seconds'.

Up until April 2019, Sainsbury's Energy was provided by British Gas. From that date, customers were automatically switched over to British Gas – users that have taken no action since will still be with this provider. That same year, Sainsbury's entered into an agreement with Npower. Now it's a partnership with Eon Next.

Pros: Clear and jargon-free bills according to our survey, customers rewarded with Nectar points; offers a variety of tariffs

Cons: Other energy suppliers in our survey score higher for bill accuracy and value for money

Can I join Sainsbury's Energy with a prepayment meter?

No, Sainsbury's Energy does not accept customers with prepayment meters. 

Check our guide to prepayment meters to find a supplier which does, and how customers rated them in our latest survey.

Does Sainsbury's Energy sell renewable energy?

Sainsbury's Energy is supplied by Eon Next, which is part of the Eon Group. It sells 100% renewable electricity tariffs, matched partly by renewable electricity Eon generates, partly buying it directly from generators and partly by buying renewable energy certificates to match customers’ use with renewable power.

Proportion of renewable electricity sold to domestic customers
Generates 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).

Sainsbury's Energy notes that 'there are currently no environmental benefits to [its] tariff'.

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

Sainsbury's Energy in the news

Sainsbury's Energy in 2021

Sainsbury's Energy customers are now supplied by Eon Next. Npower became part of the Eon Group and all of its customers were moved to Eon Next.

Sainsbury's Energy in 2019

April: After cutting ties with British Gas, Sainsbury's relaunched its energy offering through a partnership with Npower.

February: Sainsbury's announced that all of its customers would be switched over to British Gas. The company also confirmed that it would not be taking on any new customers at that time.