Best Energy Suppliers UK 2025 — Rated by Real Customers
Last updated: January 2025 | Affiliate disclosure: Some links on this page earn us a referral fee. This never influences our ratings.
Energy bills are one of the biggest household expenses in the UK — and choosing the right supplier can make a real difference. But price isn’t everything. Customer service, billing accuracy, complaint resolution, and digital experience all matter enormously when you’re handing over hundreds of pounds every month. We’ve analysed thousands of real customer reviews to bring you an honest ranking of the best energy suppliers in the UK right now.
Top Energy Suppliers UK 2025 — Quick Comparison
| Supplier | wannarate Score | Best For | Tariff Types |
|---|---|---|---|
| Octopus Energy | ⭐⭐⭐⭐⭐ 4.8/5 | Overall best | Fixed & variable |
| EDF Energy | ⭐⭐⭐⭐ 4.1/5 | Reliability | Fixed & variable |
| E.ON Next | ⭐⭐⭐⭐ 4.0/5 | Customer service | Fixed & variable |
| British Gas | ⭐⭐⭐ 3.6/5 | Name recognition | Fixed & variable |
| Scottish Power | ⭐⭐⭐ 3.4/5 | Green energy | Fixed & variable |
1. Octopus Energy — Best Overall Energy Supplier UK 2025
wannarate Score: 4.8/5
Octopus Energy is, without question, the standout energy supplier in the UK right now. What started as a challenger has become the benchmark that every other supplier is judged against — and most of them fall short. Real customers consistently praise Octopus for fast, helpful customer service, transparent billing, and genuinely innovative tariffs like Agile (which offers variable pricing based on wholesale costs).
Why Octopus Energy Ranks #1
- Consistently top-rated for customer service across multiple independent surveys
- Transparent, accurate billing with no nasty surprises
- The Agile tariff can offer significant savings for smart energy users
- Excellent app and online account management
- 100% renewable electricity as standard
Where Octopus Falls Short
- Agile tariff isn’t for everyone — variable pricing requires active management
- Prices aren’t always the cheapest on the market
Bottom line: If you want a reliable, customer-friendly energy supplier with innovative tariff options and a genuine commitment to renewable energy, Octopus is the answer.
2. EDF Energy — Best for Reliability
wannarate Score: 4.1/5
EDF is one of the UK’s largest energy companies and, unlike some of its big-six rivals, has maintained a reasonable standard of customer service. Customer reviews highlight reliable billing and a solid online account experience. It’s not as exciting as Octopus, but if you want a steady, dependable supplier from a well-established company, EDF is a solid choice.
Pros
- Reliable billing and consistent service
- Good range of fixed-rate tariffs
- Reasonable customer support
Cons
- Less innovative than newer challengers
- App experience is decent but not exceptional
3. E.ON Next — Best Customer Service Among Big Suppliers
wannarate Score: 4.0/5
E.ON Next (the rebranded modern arm of E.ON) has worked hard to shed the legacy baggage of the old big-six suppliers, and it’s largely succeeding. Customer reviews consistently highlight responsive, helpful service — a genuine differentiator in an industry not known for it.
Pros
- Strong customer service reputation
- Clear, straightforward tariffs
- Good smart meter rollout
Cons
- Prices can be higher than smaller challengers
4. British Gas — Trusted Name, Mixed Reviews
wannarate Score: 3.6/5
British Gas is the name that millions of UK households recognise — but name recognition alone doesn’t make a great energy supplier. Customer reviews are decidedly mixed, with billing issues and customer service wait times being recurring complaints. Its HomeCare boiler cover product gets better reviews than its energy supply service.
5. Scottish Power — Decent for Green Energy, Patchy Service
wannarate Score: 3.4/5
Scottish Power has made genuine commitments to renewable energy and has a reasonable green credentials story. However, customer service reviews remain inconsistent, and billing complaints are more common than they should be. Improving, but not yet where it needs to be.
How to Switch Energy Suppliers in the UK
- Check your current contract — Make sure you’re not in a fixed-term deal with an exit fee
- Compare tariffs — Use wannarate.com or a comparison site to find the best current deals
- Sign up with your new supplier — They handle the switch process; you don’t need to contact your old supplier
- Provide a meter reading on the switch date to ensure accurate final billing
- Allow up to 21 days for the switch to complete
Frequently Asked Questions
Which is the cheapest energy supplier in the UK in 2025?
The cheapest supplier changes constantly based on tariff availability and the Ofgem price cap. We recommend checking current comparison sites alongside our reviews to find the best deal at the time you’re switching.
Is it worth switching energy suppliers?
If you’re on a standard variable tariff and haven’t reviewed your energy deal in the past 12 months, switching could save you money and get you to a supplier with better customer service. It costs nothing to switch and the process takes less than 10 minutes.
How does wannarate.com rate energy suppliers?
Our energy supplier ratings combine real customer reviews submitted to wannarate.com with analysis of customer service performance data, billing complaint rates, and Ofgem satisfaction data. Read our full methodology.