EDF Energy So Energy (September 2026)
Overview
There is no single best choice: compare price, service, app and green-energy evidence separately.
About EDF Energy and So Energy
EDF Energy
EDF Energy is one of the UK’s major household electricity and gas suppliers. It is also an electricity generator, with nuclear, wind and solar assets in Britain.
So Energy
So Energy was founded in 2015 and supplies gas and renewable electricity to UK homes. It positions its service around simple pricing, renewable power and UK-based customer support.
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Tariffs and pricing
Annual estimates use the stored consumption assumptions. Check current regional rates, terms and eligibility before switching.
EDF Energy and So Energy: tariff options
EDF Energy
These are the household tariffs currently available in our comparison data. Prices and availability can vary by region, meter type and payment method.
So Energy
These are the household tariffs currently available in our comparison data. Prices and availability can vary by region, meter type and payment method.
Customer reviews
EDF Energy maintains a substantial presence on Trustpilot, achieving a score of 4.8 out of 5 from over 250,000 customers. Feedback frequently points to polite staff providing clear guidance and prompt resolutions. However, some users report occasional difficulties navigating automated systems or reaching representatives by phone. In total, 83% of reviewers award EDF Energy five stars.
So Energy holds a Trustpilot score of 4.5 out of 5, based on more than 30,000 reviews. Customers regularly commend staff for their patience when explaining tariffs, though some cite high standing charges and long wait times for phone support. Both suppliers demonstrate active engagement by replying to 99% of their negative reviews.
Results from the annual Which? survey show So Energy scoring 60 out of 100, slightly ahead of EDF Energy at 58. EDF Energy received positive marks for its help for those who need it, but performed poorly in the switching and contacting your supplier categories. Conversely, So Energy performed strongly regarding ease of contacting and clarity of statements, but received lower ratings for its smart meters.
App experience
Both suppliers provide mobile apps for account management, though their user bases differ significantly in size. EDF Energy’s iOS app scores 4.6 out of 5 across 187,000 ratings, while its Android version scores 4.4 from over 51,000 ratings. Recent updates have focused on tariff discovery and smart charging. User feedback indicates notable improvements following these updates, although some report issues with payments and contacting customer service.
So Energy’s app achieves higher headline scores, registering 4.7 on iOS and 4.6 on Google Play. However, these figures are drawn from much smaller samples of 225 and 138 ratings, respectively, making direct comparisons with EDF Energy difficult. Reviews for the So Energy app frequently mention clear design and simple navigation, alongside occasional reports of bugs during meter reading submissions.
Service and support
Average wait: 2.8 min
Hours: Mon–Thu 8am–6pm, Fri 8am–4pm, closed Saturday, closed Sunday
Average wait: 1.1 min
Hours: Weekdays 9am–5pm, closed Saturday, closed Sunday
Replies: 86% within 2 days
Hours: 24/7
Replies: 91% within 2 days
Hours: 24/7
The two suppliers perform similarly in the Citizens Advice rankings. EDF Energy scores 2.9 out of 5 to place 11th, while So Energy follows closely in 12th place with a score of 2.86. Both companies accept Direct Debit payments, but EDF Energy provides additional flexibility by accepting cash, cheques, and prepayment.
For customer service contact, So Energy connects calls faster, averaging a wait time of 1 minute 6 seconds against EDF Energy’s 2 minutes 46 seconds. So Energy also replies to 91.3% of emails within two days, edging past EDF Energy’s 85.6% response rate. Furthermore, So Energy has formally registered vulnerability commitments with Citizens Advice.
Complaints and performance
Both EDF Energy and So Energy have published their complaints data for the second quarter of 2026. EDF Energy received 965 complaints for every 100,000 customers. So Energy received 1,474 complaints per 100,000 customers in the same period.
Green energy
Published fuel-mix figures are shown only where both a source URL and reporting period are present in the stored data.
Our verdict
| If you care most about | Choose |
|---|---|
| The lowest annual cost on our assumptions | So Energy |
| Overall customer service | EDF Energy |
| A well-rated mobile app | So Energy |
| A greener fuel mix | So Energy |
There is no single best choice: compare price, service, app and green-energy evidence separately.
Use the decision table to match the available evidence to the factors that matter most to your household.
- Cheapest variable tariff at £1,611 / year
- 4.8 Trustpilot from 251,360 reviews
- iOS app rated 4.6 out of 5
- 86% of emails answered within 2 days
- 11% of Google Play ratings are negative
- Cheapest variable tariff at £1,508 / year
- 4.5 Trustpilot from 30,767 reviews
- iOS app rated 4.7 out of 5
- 91% of emails answered within 2 days
- Cheapest overall tariff carries a £190 exit fee
Frequently asked questions
Which is cheaper, EDF Energy or So Energy?
On the stored annual-cost assumptions, EDF Energy is £1,611 and So Energy is £1,508. So Energy is lower by about £103 a year.
Can EDF Energy and So Energy complaint rates be compared directly?
Yes. Both figures cover Q2 2026: EDF Energy reports 965 complaints per 100,000 customers and So Energy reports 1474.
Which supplier leads on customer service?
On the comparable customer-service measure used in the decision table, EDF Energy leads.
Which supplier has the better app evidence?
On the comparable app measure used in the decision table, So Energy leads.
Do tariff eligibility rules matter?
Yes. Specialist, time-of-use, EV, heat-pump and export tariffs can have equipment, meter or account requirements. Check the current supplier terms before applying.
Which supplier has the greener evidence?
On the comparable green-energy measure used in the decision table, So Energy leads. This row is based on published fuel-mix percentages.
Which is better overall, EDF Energy or So Energy?
There is no single overall winner in this repaired draft. Price, service, app and green-energy evidence are kept as separate choices in the decision table.
When was this comparison updated?
The structured source payload is for September 2026.
What changed this month
This month, EDF Energy's iOS app days since last update rose from 6 to 13, So Energy's iOS sampled neutral reviews rose from 0 to 1, and EDF Energy's play store days since last update rose from 7 to 14. There were 26 other data changes this month — see the full changelog below for details.
Data changes this month (35)
EDF Energy
- Trustpilot reviews243,334 → 251,360
- iOS app ratings count185,000 → 187,000
- iOS app days since last update6 → 13
- iOS sampled reviews avg stars2 → 2.33
- Play Store rating4.4256063 → 4.3837585
- Play Store ratings count50,315 → 51,073
- Play Store days since last update7 → 14
- Play Store positive ratings %86.3 → 85.2
- Play Store negative ratings %9.8 → 10.6
- Play Store neutral ratings %3.9 → 4.2
- Play Store net-positive %76.5 → 74.6
- Cheapest variable tariff£1,754.76 → £1,610.88
- Cheapest fixed tariff£1,824.37 → £1,691.28
- Cheapest tariff£1,754.76 → £1,610.88
- Cheapest tariff exit fee£50 → £0
- Cheapest fixed tariff exit fee£150 → £200
- Tariff count4 → 3
- Variable tariffs available2 → 1
So Energy
- Trustpilot reviews30,220 → 30,767
- Trustpilot negative reviews replied %100 → 99
- iOS app ratings count197 → 225
- iOS app days since last update45 → 75
- iOS sampled reviews avg stars3.67 → 3.75
- iOS sampled neutral reviews0 → 1
- Play Store rating4.62 → 4.64
- Play Store ratings count127 → 138
- Play Store days since last update46 → 76
- Play Store positive ratings %92 → 91.9
- Play Store negative ratings %3.2 → 2.2
- Play Store neutral ratings %4.8 → 5.9
- Play Store net-positive %88.8 → 89.7
- Avg social media response time351 → no longer available
- Cheapest variable tariff£1,687.08 → £1,508.13
- Cheapest fixed tariff£1,828.88 → £1,734.74
- Cheapest tariff£1,687.08 → £1,508.13
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Written by
Rob Gibbs
Hi, I'm Rob, and I run Energy-Review.co.uk. I initially started this project in 2018 when I was looking to switch energy suppliers and found there wasn't a website that provided simple, data-backed reviews on all the suppliers available. Since then, I have spent a lot of time (too much, some may say!) looking at all publicly available data about each supplier and writing reviews using this information. These reviews are updated as regularly as possible, and any data is backed up by a source where necessary. I have also started writing guides on various energy-related topics, which hopefully you will find useful. If you find any issues, please use our contact form to let us know.