So Energy UK: A Complete 2026 Guide to Tariffs, Reviews, and Green Energy
In the crowded UK energy market, So Energy has established itself as a notable player. It balances competitive pricing with a strong commitment to renewable energy and customer experience. It's not one of the largest suppliers in the UK, but it has carved out a steady presence, competing for household custom against rivals such as Octopus Energy, OVO Energy, and E.ON Next.
This comprehensive guide explores everything you need to know about So Energy in 2026, from its approach to sourcing green electricity to its current tariff structures, customer service reputation, regulatory protections, and additional home energy services.
1. What Makes So Energy Different?
Founded in 2015 by a pair of school friends, So Energy grew steadily as a small, green-focused supplier. Then, in August 2021, ESB Group acquired a majority stake (more than 75%). The two businesses were then merged, with ESB Energy UK's retail customers folded into the So Energy brand during 2022. This took So Energy's combined customer base to around 310,000 households. As of mid-2025, the supplier accounts for roughly 1% of the UK's domestic electricity customers and around 1% of domestic gas customers.
Democratic Energy Sourcing
One of So Energy's most distinctive features remains its approach to renewable energy procurement. Like other suppliers, the company buys Renewable Energy Guarantee of Origin (REGO) certificates to back its green electricity claims. It's worth being clear, though, that this green guarantee applies to electricity only. So Energy's gas is not certified as carbon-neutral or green - in line with the wider market, where genuinely "green gas" remains rare and costly.
Historically, So Energy customers were invited to take part in an annual online poll to vote on the mix of renewable technologies they wanted the company to support, choosing between:
- Wind
- Solar
- Hydro
- Biomass
The resulting percentage split was then reflected in the REGO certificates bought for the following year. So Energy continues to publish its renewable fuel mix regularly, so customers can see where their certified electricity is coming from. This model gives customers more visibility into their green tariff than is typical among larger suppliers.
A Focus on Straightforward Service
So Energy continues to place a big emphasis on clear, accessible, and responsive customer service. This shows in a relatively streamlined set of tariff options and multiple contact channels. The company remains a signatory of the Energy Switch Guarantee, a voluntary industry commitment designed to make switching supplier smooth and reliable.
As with any supplier, So Energy is regulated by Ofgem, the independent body responsible for licensing energy companies, approving price protections, and enforcing customer-protection rules. If you're ever concerned about a supplier's financial stability, it's worth noting that the energy market includes a "supplier of last resort" safety net. If any supplier were to fail, customers would not lose their gas or electricity supply - their account would simply move to another provider.
2. A Look at So Energy's Tariffs in 2026
So Energy avoids over-complicating its offerings, providing a focused range of plans for customers who pay via Direct Debit or upon receipt of their bill. The company does not currently cater to customers with prepayment meters.
The Ofgem Energy Price Cap limits the unit rates and standing charges that suppliers can charge on default variable tariffs. From 1 April 2026, it fell to around £1,641 a year for a typical dual-fuel household paying by Direct Debit - a drop of roughly £117 since the start of the year. This cap directly affects So Energy's default variable tariff, and gives a useful benchmark for judging its fixed deals.
Here's a breakdown of So Energy's main tariff types as they stand in 2026:
| Tariff Type | Best For | Key Features |
|---|---|---|
| So Flex (Variable, default) | Customers who haven't actively chosen a tariff, or who want maximum flexibility. | Prices track Ofgem's quarterly price cap and reset every three months. No exit fees, so you can switch away at any time. This is the only tariff not backed by 100% renewable electricity certification. |
| So Green Tracker | Customers who want a guaranteed discount versus the price cap with a short-term commitment. | Typically priced around £50 a year below the cap (roughly £25 per fuel) on a 12-month tariff, resetting in line with the cap every three months. Backed by 100% renewable electricity. |
| Fixed-Rate Tariffs (e.g. So Hawthorne, So Kings, So Kielder, So Larch) | Customers seeking price certainty over a longer period, even if rates sit at or slightly above the current cap. | Unit rates and standing charges are locked in for 12 or 24 months. So Energy has been candid that elevated wholesale prices in 2026 mean its fixed deals are often priced at or just above the cap rather than comfortably below it. Early exit fees apply. |
| So EV (Electric Vehicle) | Electric vehicle owners — or anyone with flexible overnight usage — who can shift consumption to off-peak hours. | Offers a sharply reduced whole-home electricity rate (around 6.5p/kWh as of 2026) during an overnight off-peak window, typically midnight to 5am. Unlike some EV tariffs, the cheap rate applies to all household electricity use during that window, not just car charging, though there's no smart dispatch — you'll need to set your charger or appliances to run on a timer. |
Dual fuel options bundle gas and electricity with a single supplier. They remain available and often provide the best overall value and simplest account management. Exit fees on fixed-rate plans are typically £50 per fuel for a one-year fixed deal and £75 per fuel for a two-year fixed deal, if you switch away more than 49 days before your contract ends. Always check the Tariff Information Label (TIL) for your specific plan, since fees and rates can vary by region and change over time.
3. Green Credentials: Is So Energy Really Green?
So Energy's electricity tariffs - with the exception of So Flex - continue to be supplied with 100% renewable electricity, backed by REGO certificates for every unit consumed. A REGO certificate is an official Ofgem-recognised confirmation that a unit of electricity was produced from a verified renewable source. This ensures the customer's electricity use is matched by an equivalent amount of green generation fed into the National Grid.
It's worth repeating that this certification applies to electricity only. So Energy's gas supply is standard, uncertified natural gas. That's the norm across almost the entire UK domestic energy market.
4. What Do Customers Think? So Energy Reviews
Customer feedback for So Energy in 2026 is mixed, though it generally compares favourably with the industry average. On Trustpilot, So Energy sits around 4.4 out of 5. Independent comparison sites note this is above the average for UK energy suppliers, though some reviewers report a more middling experience, with a meaningful number of complaints alongside the positive reviews.
Positive reviews commonly praise the helpfulness and efficiency of the customer service team, the simplicity of online account management, competitive pricing, and accurate billing. Customers with straightforward accounts and no billing complications tend to be the most satisfied, and often praise the clean digital tools. Negative feedback tends to cluster around billing queries and occasional technical hiccups during the switching process. These issues aren't uncommon for suppliers of any size, but they're worth being aware of.
If a complaint with So Energy isn't resolved within eight weeks (or if you receive a deadlock letter sooner), you can refer the matter free of charge to the Energy Ombudsman, whose decisions are binding on the supplier.
5. Managing Your Account with So Energy
So Energy provides modern digital tools to help customers manage their usage and bills effectively.
The So Energy App
Customers can manage their account on the move using the So Energy mobile app. This digital tool allows you to perform key tasks such as submitting meter readings, viewing and downloading bills, and monitoring your energy consumption patterns over time.
Smart Meters
So Energy remains a proactive supporter of the smart meter rollout, and offers free installation in customers' homes. A smart meter removes the need for manual readings and provides near real-time data on energy usage. This helps you make more informed decisions to reduce consumption and save money. The company supports both single-rate and two-rate (Economy 7) smart meters. A smart meter is generally required to access time-of-use tariffs like So EV.
6. Beyond Energy Supply: Other Services
So Energy continues to offer a range of services aimed at helping UK homes become more energy-efficient and sustainable:
- Solar Panel and Battery Storage Installation: A complete service to help households generate and store their own renewable electricity.
- Air Source Heat Pump Installation: Providing a low-carbon alternative to traditional gas boilers.
- Boiler and Heating Cover: Insurance plans to protect against unexpected boiler breakdowns and central heating issues.
- Smart Export Guarantee (SEG): For customers who generate their own electricity through solar panels or other microgeneration, So Energy offers a SEG tariff, paying them for any surplus energy they export back to the grid.
7. How to Contact So Energy
Getting in touch with the So Energy team remains straightforward, though it's worth checking the current website for the latest opening hours before calling.
| Method | Details | Availability |
|---|---|---|
| Phone | 0330 111 5050 | Typically Monday - Friday during office hours; check the website for current hours. |
| Online Chat | Via the 'Chat Now' button on their website | Live advisers available during office hours. A chatbot is available 24/7 for basic queries. |
| help@so.energy | For non-urgent enquiries. |
8. Support for Customers Facing Financial Difficulty
So Energy has a dedicated support system for customers who are struggling to pay their bills. The company encourages anyone experiencing financial hardship to make contact as early as possible. Support options available include:
- Arranging a manageable payment plan to clear debt over time.
- Temporarily lowering monthly Direct Debit payments.
- Providing advice on improving energy efficiency to reduce future bills.
- Guiding customers towards government support schemes and independent charities, such as the Warm Home Discount and grants for energy efficiency improvements.
9. Is So Energy the Right Supplier for You in 2026?
So Energy presents a reasonable option for the environmentally-conscious consumer who values straightforward tariffs and a digital-first account experience. Its 100% renewable electricity on most tariffs, transparent fuel-mix reporting, and competitive So EV overnight rate make it an attractive choice for households with electric vehicles or flexible overnight usage. Its So Green Tracker tariff also offers a modest guaranteed discount versus the price cap, for those wanting some certainty without locking in long-term.
That said, wholesale prices have remained high through 2026, so So Energy's longer fixed deals haven't always undercut the price cap. It's worth comparing rates carefully against the cap and against other suppliers before committing. Its lack of prepayment tariffs also means it won't suit everyone.
Overall, for households with credit meters who are comfortable managing their account online, So Energy's blend of green credentials, customer voting heritage, and digital convenience remains worth considering. But as with any switch, always check the live Tariff Information Label for your postcode rather than relying on average figures, since rates vary by region and change frequently.
