So Energy is a UK energy supplier focused on renewable electricity and simple, good-value tariffs. It launched in November 2015 and now supplies around 300,000 customer accounts, with 100% renewable electricity on every tariff.
Its stated mission is to "help customers achieve net zero by providing great value renewable energy solutions with simple, clear, outstanding service". As well as gas and electricity, it offers solar panels, home batteries, EV chargers and, in some areas, heat pumps.
So Energy's owner, ESB, is looking to sell the business, and EDF is reported to be among the bidders. Nothing has been agreed yet. Customers rate So Energy well, but its Which? assessment and Citizens Advice scores are weaker, so it's worth comparing before you switch.
| Company detail | So Energy |
|---|---|
| Founded | 2015, by Simon Oscroft and Charlie Davies |
| Owner | ESB, Ireland's state-owned energy company, which is exploring a sale |
| Customers | Around 300,000, about 1% of UK electricity and gas customers (March 2026) |
| Electricity | 100% renewable on all tariffs |
| Tariffs offered | Variable, fixed, tracker and EV |
| Exit fees | None on variable, £50 to £95 per fuel on fixed |
| Trustpilot rating | Around 4.5 out of 5 from more than 30,000 reviews |
| Which? score | 60% overall, with a strong customer score of 76% |
| Citizens Advice rating | 2.85 out of 5, ranked 11th (April to June 2026) |
| Phone | 0330 111 5050 |
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If you have a customer services query or want to make a complaint, there are several ways to get in touch. Complaints can be made through any of them.
| Contact method | Details |
|---|---|
| Live chat | Use the Chat with Us link in the So Energy Help Centre 9am to 5pm, Monday to Friday |
| Phone | 0330 111 5050 9am to 5pm, Monday to Friday |
| help@so.energy | |
| Online form | Use the form on the So Energy contact us page. It's mainly for existing customers, but you can send a query without an account number. |
In keeping with its founding principle of simplicity, So Energy has a short tariff range. The live list of current So Energy tariffs is shown below.
| Tariff Name | Electricity Unit Price | Electricity Standing Charge | Gas Unit Price | Gas Standing Charge |
|---|
For comparison purposes, energy prices shown above are based on average usage figures only. Prices may vary depending on the region you live in and your own gas and electricity usage. To see the best energy deals for where you are, run a gas and electric comparison today.
| Tariff | What it offers |
|---|---|
| So Flex | So Energy's standard variable tariff. Prices move with the Ofgem price cap, with no end date and no exit fees. Pay by monthly Direct Debit or quarterly on receipt of a bill. |
| Fixed | Several fixed deals, locking your unit rates for the length of the tariff. Exit fees of £50 to £95 per fuel apply if you leave early. |
| Tracker | A tariff whose prices follow the market rather than being fixed. |
| EV | A tariff for electric vehicle owners, with cheaper electricity overnight. See our EV tariffs guide. |
Tariff details correct as of July 2026.
In July 2026, So Energy's owner, ESB, announced it had started looking at options to sell the business. PwC is running the sale process.
In September 2026, EDF was reported to be in talks to buy So Energy's customers, with at least one other bidder also involved. No deal has been agreed so far.
What does this mean for customers? Nothing changes for now. If a sale goes ahead, customers would move to the new supplier without any interruption to their gas or electricity. We'll update this page when there is news.
So Energy scores around 4.5 out of 5 on Trustpilot from more than 30,000 reviews, and it is good to see that it actively responds to negative feedback and tries to help customers where it can.
So Energy's customers are happy. In the Which? survey from September and October 2025, it had a customer score of 76%, joint 5th of 17 suppliers, and just 2% of its customers had made a formal complaint, the lowest of any supplier.
However, it scored poorly in the Which? assessment of how suppliers handle complaints, contact and smart meters, which brought its overall score down to 60%. It isn't a Which? Recommended Provider.
| Which? category | Rating |
|---|---|
| Ease of contacting | 4 out of 5 |
| Clarity of statements | 4 out of 5 |
| Customer service overall | 3 out of 5 |
| Value for money | 3 out of 5 |
| Accuracy of payments | 3 out of 5 |
Citizens Advice gave So Energy a customer service rating of 2.85 out of 5 for April to June 2026, placing it 11th among suppliers. It scored full marks for customer commitments, with an average call waiting time of 2 minutes, and answered almost 92% of emails within two days.
So Energy was founded in 2015 by school friends Simon Oscroft and Charlie Davies, with the aim of building an energy business around renewable energy and the principles of "simplicity, honesty and great value". It grew steadily without buying other suppliers, reaching around 220,000 customer accounts by 2021.
The energy crisis of 2021 and 2022 hit many suppliers hard, and in August 2021 So Energy merged with ESB Energy, the UK supply business of Ireland's Electricity Supply Board (ESB). The deal gave ESB control of the combined business, but kept the So Energy brand and helped it survive a crisis that saw dozens of suppliers go bust.
ESB is Ireland's largest energy company and is mostly owned by the Irish Government. As explained above, it is now looking to sell So Energy.
Any electricity we use is generated from a combination of different fuels such as gas, nuclear, coal and renewable sources (wind, hydro and the sun). Energy suppliers buy the electricity they sell to you from generators, and the proportion of each fuel makes up a supplier's fuel mix.
| Supplier | Coal | Gas | Nuclear | Renewable | Other | CO2 (g/kWh) | Nuclear Waste (g/kWh) |
|---|
True to its aim of being a renewable energy supplier, So Energy has supplied 100% renewable electricity since 2017, backed by Renewable Energy Guarantee of Origin (REGO) certificates.
So Energy may suit you if you want 100% renewable electricity, a simple choice of tariffs and a supplier that most of its customers rate highly. It also offers solar panels, batteries and EV chargers if you're planning to go further.
Bear in mind that its Which? assessment and Citizens Advice scores are weaker, and that the business is up for sale, so your supplier could change if a deal goes ahead. As always, compare prices using your own postcode and usage before switching.
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Its owner, ESB, is looking at selling the business, and EDF has been reported as one of the interested buyers. As of September 2026, no deal has been agreed. If a sale goes ahead, customers' supply won't be interrupted.
So Energy is owned by ESB, Ireland's Electricity Supply Board, which took control in 2021 when So Energy merged with ESB Energy.
Its So Flex variable tariff has no exit fees. Fixed tariffs carry exit fees of £50 to £95 per fuel, although you can switch penalty-free in the final 49 days of any fixed deal.
Yes. So Energy has supplied 100% renewable electricity on all its tariffs since 2017.
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Last updated: 29 September 2026. Which? figures are from its September to November 2025 assessment. Citizens Advice figures cover April to June 2026. Trustpilot rating and tariff details correct as of July 2026. Tariff availability and pricing change frequently, so always confirm current rates through a comparison using your own postcode and consumption.
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