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So Energy
So Energy is a gas and electricity supplier based in London, built around supplying 100% renewable electricity, backed by Renewable Energy Guarantee of Origin (REGO) certificates, on most of its tariffs. So Energy is majority-owned by ESB Group, Ireland's state-owned utility, following an acquisition in 2021 and a later merger with ESB Energy's UK customer base, which grew So Energy's customer numbers to around 300,000 households.
So Energy Customer Rating
So Energy currently has a 4.5 out of 5 TrustScore on Trustpilot, based on around 31,000 reviews. This figure was checked in September 2026 and may change over time.
Reviews cover different aspects of the customer experience, including account management, billing and customer service.
What tariffs does So Energy offer?
So Energy’s tariff range includes:
- So Fixed: 100% renewable electricity, 12 or 24 month contracts, with unit rates and standing charges locked in for the term.
- So Green Tracker: 100% renewable electricity, priced with a fixed relationship to the Ofgem price cap rather than a flat rate — currently designed to stay £50 below the cap on the 12-month version (£25 per fuel) and £100 below on the 24-month version (£50 per fuel). Requires a smart meter.
- So Flex: So Energy’s only non-green tariff, and its standard variable tariff, moving with the Ofgem price cap every three months.
- So EV: a 100% renewable EV tariff working with any charger and EV, offering a discounted overnight rate. Requires a smart meter.
What to check before switching to or from So Energy
- Which account system you’re on: if you were previously an ESB Energy customer, your account may differ slightly from someone who signed up directly with So Energy.
- Fixed tariff pricing versus the cap: don’t assume a fixed tariff is automatically cheaper than the price cap. Compare the actual price, not just the tariff type.
- Exit fees on fixed tariffs: check whether your chosen tariff carries one before committing.
- Your electricity usage: EV and tracker tariffs may work differently depending on when you use electricity.
- Renewable electricity: Check which tariff you are choosing, as So Flex is currently the supplier’s non-green tariff.
FAQs about So Energy
If you’re after more information about So Energy, look no further. Find the answers to your frequently asked questions below.
Does So Energy have an app?
Yes. So Energy's app is used for account management, top-ups on prepayment tariffs, and usage tracking.
Can I switch to So Energy if i have a smart meter?
Yes. So Energy supports smart meter functionality, and several of its tariffs, including its EV tariff, are built around time-of-use data that requires a working smart meter.
Is So Energy a renewable energy supplier?
So Energy currently offers several tariffs with 100% renewable electricity, including its fixed tariffs, So Green Tracker and So EV. So Flex is currently its only non-green tariff.
Is So Energy cheaper than the Big Six?
Not necessarily. Its fixed tariffs aren't always priced below the price cap, depending on wholesale market conditions at the time; always compare current prices directly rather than assuming a smaller supplier is automatically cheaper.
Does So Energy have exit fees?
So Energy applies exit fees on its fixed tariffs, in line with most other suppliers. Check your specific contract terms for the current amount, since this varies by tariff.
How to contact So Energy
• Phone: 0330 111 5050 • Email: help@so.energy • Twitter/X: @SoEnergyUK If a complaint isn't resolved within eight weeks, or you get a deadlock letter sooner, you can take it to the Energy Ombudsman free of charge.