Octopus vs Sainsbury’s Energy (2025 Comparison)

In this guide, we’ll look at Octopus vs Sainsbury’s Energy in depth. Both of these suppliers are known as being green suppliers, but is one greener and which one is the better option for you?

Read on to find out how they compare when it comes to price, bill accuracy, customer service and more. 

Who are Octopus?

Octopus have over 6.5 million customers and have grown to be one of the leading energy names in the U.K. Octopus is known for their innovative tariff options and commitment to a greener future.

Friends of The Earth approve of Octopus, and they have also been a Which? recommended supplier for the last few years.

Who are Sainsbury’s Energy?

Sainsbury’s Energy do not offer their own gas and electricity services, instead they partner with an existing supplier. They are currently in partnership with E.On Next.

This partnership lets customers receive Sainsbury’s related perks, like earning Nectar points on their energy bills, whilst having the comfort that their energy is being supplied by one of the big energy providers.

Octopus vs Sainsbury’s Energy: What’s the difference in price?

We asked for quotes based on the below factors to find out which energy supplier offers the best prices for their tariffs: 

• Dual fuel supply
• Standard meter
• Moderate usage (a 3-bedroom home with a family of four)
• 2,900 kWh of electricity and 12,000 kWh of gas consumption
• Postcode located in the South East of England

Octopus provides customers with three different tariffs:

In comparison, Sainsbry’s Energy offers three different tariffs:

Octopus vs Sainsbury’s Energy: What’s the difference in tariff options? 

Now, let’s look at each of these suppliers’ tariffs in a bit more detail.

Octopus

As we’ve seen, Octopus have three different options available; the details of each can be seen below:

Sainsbury’ Energy

Here are the three Sainsbury’s tariffs in more detail:

There are quite a few differences between the tariff options between the two suppliers.

When it comes to the variable tariff, Octopus offers 100% renewable electricity, whereas Sainsbury’s does not. Sainsbury’s does, however, offer 3x nectar points on your Sainsbury’s shops.

With the fixed tariffs, Octopus offer no exit fees whereas on the same length fixed tariff with Sainsbury’s, you would pay £75 per fuel. Octopus do not require a smart meter either. With Sainsbury’s however, you could get up to £40 worth of nectar points along with 3x points on all your Sainsbury’s shops.

Who offers the greenest energy?

Many choose their energy provider based on how much they care about the planet, but what sets Good Energy and Octopus apart? Now, we’ll compare them when it comes to green energy.

Octopus manages renewable energy assets valued at £3.4 billion, sufficient to supply power to around 2 million households in the UK. The company encourages customers to install solar power systems at home as part of its sustainability efforts.

From 2018 to 2021, Octopus effectively neutralised 708,700 tonnes of CO2 emissions. Their commitment to eco-friendly innovation includes a £10 million investment in the UK’s only research and development centre focused on low-carbon heating solutions. All of Octopus’s electricity tariffs are 100% renewable, highlighting their position as one of Europe’s leading renewable energy investors.

As we mentioned earlier, Sainsbury’s does not actually supply your energy; this is all done through E.ON Next.

E.ON Next do generate some of their own electricity with Biomass plants in Lockerbie and Sheffield that produce enough energy to power 100,000 homes. They also work directly with wind and solar farms.

Sainsbury’s do offer 100% renewable electricity on their fixed tariffs, but not on their variable tariff.

Who has better customer reviews?

We used Trustpilot to see how current customers rate both energy providers and whether Octopus or Sainsbury’s Energy is rated higher.

Here are the latest review ratings: 

• Octopus score 4.8 out of 5 based on over 245,000 reviews (source)
• Sainsbury’s Energy is rated 4.5 out of 5 based on over 2,800 reviews (source)

89% of Octopus’ reviews were five stars, and 79% of Sainsbury’s ratings were five stars.

Who has the better app?

Many energy customers choose to manage their accounts via their phones, so when it comes to account management, a supplier’s app is very important.

It appears since moving to E.ON Next as their partner, Sainsbury’s have stopped using their energy app. All account management, including meter readings, bill payments and changing details, is done through their website.

Octopus Energy’s app scores a very high 4.8/5 on the App Store and similarly highly on the Google Play store. Customers say they use the app to check usage, submit meter readings and pay their bills easily. The app also offers detailed charts and data on your energy usage, even in near real-time.

Who has the better customer service?

Citizens Advice conducts quarterly surveys to provide updated information on suppliers’ customer service.

We’ve picked out the key Citizens Advice data to understand which of the two energy suppliers is best for customer service. Sainsbury’s aren’t included in the survey, so we have used E.ON Next instead.

Octopus vs Sainsbury’s Energy: What are the main differences between the two?

Below, we have our comparison of both suppliers in each key area:

Who is the better supplier?

Unless you are a regular Sainsbury’s shopper, than Octopus are likely to be the better supplier for you. Octopus have better tariff options, lower prices, better customer reviews and a well-rated app.

Sainsbury’s do perform better when it comes to customer service however and do provide some good incentives in the form of Nectar points.