So Energy Review (October 2026): Is So Energy Any Good, and Are Its Tariffs Worth It?

Last updated: Tuesday 20 October 2026 (Europe/London).
Next update: when Citizens Advice publishes its next supplier scores (due December 2026), when So Energy changes its tariffs, or when Ofgem confirms the January 2027 price cap.
By: Switch Editorial Team, Switch Squid Ltd

As of 20 October 2026, So Energy is a small green supplier whose customers like it more than the official complaint figures suggest: Which? gives it a 76% customer score, joint fifth of 17 suppliers, but Citizens Advice ranks it 11th of 16 for April to June 2026 with 2.85 out of 5. Its most interesting tariff is a Green Tracker that So Energy says stays £50 below the price cap, which would be about £1,673 a year at Ofgem’s typical usage against the £1,723 cap. Its fixed tariffs run for 12, 18 or 24 months with exit fees of £75 or £95 per fuel, and it doesn’t take prepayment customers. This SwitchSquid review covers the scores, the tariffs, what customers say and how So Energy compares with better-rated suppliers. We may earn a commission if you compare or switch through links on this page; it doesn’t change the price you pay.

Sources: Citizens Advice — So Energy customer service, Which? — So Energy review, So Energy — fixed rate tariffs and Ofgem — price cap unit rates and standing charges (all checked on 20 October 2026).

Compare home energy deals for your postcode (MoneySuperMarket)

• The Ofgem price cap for a typical dual-fuel home on Direct Debit is £1,723 a year from 1 October to 31 December 2026, when we checked on 20 October 2026

• Compare tariffs from a range of suppliers using your own usage

• Main limitation: not every supplier or tariff appears on every comparison, and the cap limits unit rates, not your total bill

View this deal

So Energy review: the short verdict

• Good for: direct debit customers who want renewable electricity on a fixed deal, or a tracker that undercuts the price cap.

• Customer view: 76% in Which?’s customer survey, with four stars for ease of contact and clear statements.

• Official ranking: 2.85 out of 5 from Citizens Advice for April to June 2026, 11th of 16 suppliers.

• Weak spots: the lowest score in Which?’s behind-the-scenes assessment, a weak complaints score from Citizens Advice, and no prepayment meters.

So Energy is a reasonable choice if one of its tariffs is cheapest for your postcode. It isn’t the supplier to pick on service ratings alone, because several rivals score higher.

What has the energy price cap done to bills this autumn?

Ofgem’s price cap for 1 October to 31 December 2026 is £1,723 a year for a typical dual-fuel home paying by direct debit, up 4% on the previous quarter. The average capped electricity rate is 26.32p per kWh with a 54.83p daily standing charge, and gas is 7.97p per kWh with a 29.68p daily standing charge.

There is no VAT on electricity from 1 October 2026 to 31 March 2027, which is already built into those rates. Gas still carries 5% VAT. Every supplier’s standard variable tariff, including So Energy’s, follows these limits, so the only way to beat the cap is a fix or a tracker priced below it.

For a wider view of how the cap affects you, see our price cap guide and the January 2027 forecast.

So Energy’s tariffs explained

So Energy shows exact prices only after you enter a postcode, because rates vary by region. Its tariff pages set out three types of deal:

• Fixed rate: unit rates and standing charges fixed for 12, 18 or 24 months, with 100% renewable electricity. Exit fees are £75 per fuel on 12-month contracts and £95 per fuel on 18 and 24-month contracts.

• Green Tracker: prices change with the price cap every three months but, So Energy says, stay £50 lower. It is a 12-month contract with 100% renewable electricity and exit fees of £50 per fuel.

• Standard variable: no contract and no exit fees, with rates that follow the price cap every three months and a mix of renewable and non-renewable electricity.

The Green Tracker is the easiest to judge. At Ofgem’s typical usage, £50 below the cap would be about £1,673 a year this quarter. The saving is measured against the cap, not against other suppliers’ fixed deals, so it is still worth checking whether a fix elsewhere is cheaper for your home.

If you pick a fix, compare the full annual cost at your own usage, not just the unit rate. A low unit rate with a high standing charge can cost more for a small flat, and the opposite is true for a large house. Our guide to standing charges and unit rates explains the trade-off.

So Energy vs other suppliers: customer service scores

Scores are for April to June 2026, from the Citizens Advice supplier comparison, checked on 20 October 2026. Each category is scored out of 5. So Energy scored the full 5 out of 5 for customer commitments. Citizens Advice says its next scores are due in December 2026.

The table puts So Energy in the lower half, mainly because of its complaints score. It is still ahead of ScottishPower and British Gas, and its contact waiting time is middling rather than poor. If service is your top priority, Outfox, Octopus and Ovo all score higher; our best energy suppliers guide ranks all 16.

Choose between fixed, tracker and variable tariffs

• Average capped electricity rate is 26.32p per kWh, and gas is 7.97p per kWh

• Compare the yearly cost at your usage, not just the unit rate

• Exit fees may apply if you leave a fixed deal early

Choose this plan

What customers say about So Energy

Which?’s review, updated on 16 June 2026, gives So Energy a total score of 60%, made up of a 76% customer survey score and a 44% Which? assessment score. The customer score was joint fifth of 17 suppliers, level with Sainsbury’s Energy, based on 108 So Energy customers in a wider survey of 11,945 people.

Customers gave So Energy four stars out of five for ease of contacting it and for clear statements, and three stars for customer service and value for money. Which? notes that no supplier scored more than three stars for value for money. The most common problems were smart meters not sending readings automatically, reported by 8% of So Energy customers, and direct debits set too high or too low, reported by 7%. Only 2% said they had made a formal complaint in the last year, the lowest share of any supplier in the survey.

The weak point is the Which? assessment, where So Energy had the lowest overall score. Which? looked at complaints handling, how easy suppliers are to contact, help for customers who need it, smart meter performance and switching. It gave So Energy 2 out of 10 for smart meters, and found that its phone, email, social media and WhatsApp channels aren’t open much beyond normal working hours, and not at all at weekends.

Before you choose, you can ask Squid AI, SwitchSquid’s AI deal assistant, to explain what a tariff would cost at your usage.

Who owns So Energy, and how green is it?

So Energy was set up in 2015. Which? says it has around 300,000 customers after merging with ESB Energy in 2021, and its parent company is ESB, which also owns a gas-fired power station. So Energy’s fixed and Green Tracker tariffs come with 100% renewable electricity, and customers can vote online for the renewable source they would like it to buy from, such as wind, solar or hydro.

So Energy also sells solar panels, battery storage, heat pumps and EV charging, so it may suit households planning bigger home energy upgrades. As with any supplier, check the tariff on its own merits rather than assuming a green brand is the cheapest.

Can you join So Energy with a prepayment meter?

No. Which? confirms that So Energy doesn’t accept customers with prepayment meters at the moment. If you prepay, compare suppliers that support it, or ask your current supplier whether your meter can be switched to credit mode once you have a smart meter.

How to switch to So Energy

1. Get your usage. Find your yearly kWh for electricity and gas on a recent bill or in your app.

2. Compare at your postcode. Check So Energy’s price against other suppliers’ fixes and trackers at the same usage.

3. Check exit fees on your current deal. Ofgem rules mean suppliers can’t charge exit fees in the last 49 days of a fixed deal.

4. Switch and take a meter reading. So Energy says the switch completes by day five, and you have 14 days to cancel.

Our guide to energy exit fees explains the rules in more detail, and our cheapest energy deals guide shows what else is available this month.

Fit summary

• Good fit for So Energy: direct debit customers who want a tracker guaranteed below the price cap, or a renewable fix that is cheapest at their postcode.

• Look elsewhere if: you want a top-rated service record, you use a prepayment meter, or you need weekend support.

• Think twice: before fixing for 18 or 24 months if you might move house, because exit fees are £95 per fuel.

Important conditions

• So Energy shows prices after you enter a postcode, and rates vary by region.

• Fixed exit fees are £75 per fuel for 12 months and £95 per fuel for 18 and 24 months; the Green Tracker has £50 per fuel.

• The Green Tracker’s £50 saving is against the price cap and moves with it every three months.

• The price cap limits unit rates and standing charges, not your total bill.

• So Energy doesn’t currently take prepayment customers.

Final decision card

Want to beat the cap without fixing for long? So Energy’s Green Tracker says it stays £50 below the cap, about £1,673 a year at typical use.
Want certainty? Compare So Energy’s 12, 18 and 24-month fixes against other suppliers at your postcode.
Service matters most? Outfox, Octopus and Ovo all score higher with Citizens Advice.

Check energy deals for your home

• Have your latest bill and yearly kWh ready

• Take a meter reading on switch day

• You have 14 days to cancel after you agree to switch

Check availability

FAQ

Is So Energy a good supplier?

So Energy’s customers rate it fairly well, with a 76% Which? customer score, joint fifth of 17 suppliers. Citizens Advice is less positive, ranking it 11th of 16 with 2.85 out of 5 for April to June 2026. It is a solid mid-table choice rather than a service leader.

Who owns So Energy?

So Energy merged with ESB Energy in 2021, and Which? names ESB as its parent company. It was founded in 2015 and has around 300,000 customers. Its fixed tariffs include 100% renewable electricity.

What are So Energy’s exit fees?

So Energy charges £75 per fuel to leave a 12-month fix early and £95 per fuel for 18 and 24-month fixes. Its Green Tracker has exit fees of £50 per fuel. The standard variable tariff has no exit fees.

Is So Energy’s Green Tracker cheaper than the price cap?

So Energy says the Green Tracker moves with the price cap every three months but stays £50 lower. At Ofgem’s typical usage that would be about £1,673 a year this quarter, against the £1,723 cap. Check whether another supplier’s fix is cheaper still at your usage.

Does So Energy accept prepayment meters?

No, So Energy doesn’t take customers with prepayment meters at the moment. If you prepay, you will need to compare suppliers that support it. Some suppliers can switch a smart meter to credit mode if you would rather pay by direct debit.

How long does it take to switch to So Energy?

So Energy says your supply moves over by day five once your old supplier agrees. You have 14 days to cancel after you agree to switch. Take a meter reading on the switch date so your final and first bills are accurate.

Is So Energy better than Octopus?

On service scores, Octopus is ahead, with 3.67 out of 5 from Citizens Advice against So Energy’s 2.85 for April to June 2026. On price, it depends on the tariff and your region, so compare both at your postcode. So Energy’s Green Tracker is a simple option if you want a guaranteed saving against the cap.