Best UK Energy Suppliers 2026

If you’re reading this, you’ve probably worked out that your current supplier might not be the best one going, and you want someone to cut through the noise and tell you who’s actually worth switching to. Fair enough. This is a rundown of the best UK energy suppliers 2026 has to offer, based on where the market actually sits right now rather than a recycled list from two years ago.

A quick note before we get into it. The energy market shifts constantly. Tariffs launch, get withdrawn, suppliers get taken over, and what was a great deal in February can look mediocre by May. Treat this as a snapshot, double-check before you sign anything, and use the comparison tools at the end if you want a personalised number.

The State of the UK Energy Market in 2026

Ofgem’s price cap for April to June 2026 sits at £1,641 a year for a typical dual-fuel household on Direct Debit, down around 7% on the previous quarter. A handful of fixed tariffs are currently beating it, though wholesale volatility linked to the Iran crisis means availability is shifting week to week. If that’s relevant to your decision, see our separate piece on what the energy crisis means for your bills.

On the supplier side, Octopus Energy is now the UK’s largest domestic supplier after absorbing Shell Energy’s household customers in late 2023. The old “Big Six” framing doesn’t really apply anymore. If you need a refresher on tariff types before picking a supplier, see Energy Tariffs Explained: A Complete Guide for UK Bill Payers. Otherwise, on with it.

Supplier-wise, the big story of the last couple of years is that Octopus Energy has become the single largest domestic supplier in the UK after absorbing Shell Energy’s household customers in late 2023, overtaking British Gas on household numbers. The Big Six of a decade ago isn’t really the Big Six anymore. It’s Octopus, British Gas, E.ON Next, EDF, OVO, and Scottish Power, roughly in that order, with a handful of smaller specialists worth considering depending on what you care about.

Summary Comparison: Top UK Energy Suppliers 2026

Supplier	Indicative Annual Cost (Typical Use)	Customer Service Rating	Green Credentials	Standout Feature
Octopus Energy	Typically below the cap on 12-month fix	Which? Recommended Provider 2026 (9th year running)	Electricity from 100% zero carbon sources	Best-in-class smart tariffs (Agile, Tracker, Intelligent Go)
E.ON Next	One of the cheapest fixes in early 2026	Which? Recommended in past years, middling in 2026 survey	100% renewable electricity (backed)	Hybrid “Next Steady” tariff with below-cap pricing
EDF Energy	Broadly in line with the cap	Lower half of Which? 2026 rankings	Zero-carbon (nuclear and renewable backed)	Good EV and heat pump tariffs
British Gas	Around the cap; fixes available	Bottom of Which? 2026 rankings	Renewable electricity on some tariffs	UK’s most familiar brand and widest engineer network
OVO Energy	Roughly cap-level	Middling Which? 2026 ranking	100% renewable electricity (REGO-backed)	Plus scheme rewards for existing customers
Scottish Power	Broadly cap-level	5th in Citizens Advice Q4 2025 (3.3/5)	100% renewable electricity	Strong on EV tariffs and smart meter rollout
100Green (formerly Green Energy UK)	Typically above cap	Which? Recommended Provider 2026, highest customer score	Genuinely 100% green gas and electricity	The only UK supplier offering genuinely green gas
Ecotricity	Typically above cap	Top of Citizens Advice Q4 2025 league table	Genuinely renewable, reinvests in new generation	Ethical credentials and reinvestment model

Figures and rankings correct as of early 2026. Always check current prices for your postcode before switching.

The Suppliers, One by One

Octopus Energy

Best for: Most people, to be blunt. Especially anyone with a smart meter, an EV, a heat pump, solar panels, or even a passing interest in getting the cheapest rate through a smart tariff.

Octopus has been named a Which? Recommended Provider nine years in a row in the 2026 survey, which is the kind of streak nobody else in the sector is close to. It holds a 4.8 rating on Trustpilot, and in the Citizens Advice league table it has sat comfortably in the upper half for years. It’s also now the UK’s largest domestic supplier, which is unusual because scale normally wrecks service. Octopus hasn’t really suffered from that, at least not yet.

Pros

• Fixed tariff typically sits below the Ofgem price cap. Not guaranteed to be the cheapest on any given day, but consistently competitive.
• 100% renewable electricity across all tariffs. Proper investment in UK renewable generation, not just REGO certificate shuffling.
• The smart tariff range is genuinely ahead of the rest of the market. Agile (half-hourly pricing), Tracker (wholesale-linked), Intelligent Octopus Go (for EV owners), and Cosy (for heat pumps) all actually save money for people who use them properly.
• Customer service is handled in-house by phone and email

Cons

• If you don’t have a smart meter and don’t want one, you’re locked out of the best tariffs. Flexible Octopus is fine, but the savings are in the smart range.
• Not always the single cheapest option in every postcode. E.ON Next has occasionally been cheaper on headline price in early 2026.
• Gas is not, and realistically cannot be, genuinely green. Octopus is honest about this, but it’s worth flagging.

E.ON Next

Best for: Bargain-hunters willing to commit to a fix, and anyone who wants decent tariff innovation from one of the bigger established suppliers.

E.ON Next has been quietly launching some of the more interesting tariffs on the market. Their “Next Steady” hybrid tariff, launched in early 2026, is the first of its kind, offering below-cap pricing through June and then a fixed rate from July onwards. It’s an unusual structure but it’s a genuine attempt to solve the “fix now or wait” dilemma that everyone’s been stuck in.

Pros

• One of the cheapest fixed tariffs available in early 2026, often landing below the April cap.
• The Next Steady hybrid is a smart bit of tariff design, especially if you’re worried about the summer cap going up.
• Backed by 100% renewable electricity on most tariffs.
• No internal exit fees on several of their fixes, so you can move to a cheaper E.ON Next tariff if one comes along.

Cons

• In the latest Which? 2026 survey, E.ON Next was described as “the best of a mediocre bunch” among the bigger suppliers, with three stars for contact ease but only two for most other categories. That’s not a disaster, but it’s not a ringing endorsement either.
• External exit fees apply on some fixes, typically £50 per fuel. Check before signing.
• Their tariff naming is genuinely confusing. There are currently several overlapping products with similar names.

EDF Energy

Best for: EV owners and anyone with a heat pump who wants off-peak rates from a big, stable supplier.

EDF has leaned into EV and heat pump tariffs, and their “Simply Tracker” product gives a modest standing charge discount on both fuels. Their zero-carbon electricity claim is backed by their nuclear fleet, which is genuinely low-carbon, even if “zero-carbon” is always doing some heavy lifting as a marketing term.

Where they fall down is customer service. EDF has spent most of the last few years in the lower half of Citizens Advice rankings and finished near the bottom of the Which? 2026 survey alongside British Gas and Scottish Power. If you don’t need to contact your supplier much, you may never notice. If you do, it’s a gamble.

Pros

• Strong range of EV tariffs with decent overnight rates.
• Heat pump tariffs offer discounted off-peak windows.
• Stable, well-capitalised business. Not going bust any time soon.
• Zero-carbon electricity backing (nuclear plus renewables).

Cons

• Persistent low customer satisfaction scores in Which? and Citizens Advice surveys.
• Headline tariffs often sit roughly at the cap rather than meaningfully below it.
• Billing clarity gets regular complaints from customers.

British Gas

Best for: People who want a familiar name and access to Britain’s biggest engineer network, particularly if they already have a HomeCare boiler policy.

British Gas is, for better or worse, the brand most people think of when they think “energy supplier”. It’s still one of the largest and has the biggest network of engineers in the country, which matters if you want one-stop-shop boiler cover alongside your energy. But on price and customer service it has struggled. It received two stars out of five for nearly every category in the Which? 2026 survey and landed at the bottom alongside EDF and Scottish Power.

Pros

• Massive engineer network. HomeCare bundling genuinely useful if you want one company for boiler and energy.
• Price Promise on some tariffs will automatically lower your fixed rate if the cap falls. A nice feature nobody else is offering quite like this.
• Decent app and smart meter experience.

Cons

• Consistently rated poorly for customer service, both by Which? and by Ofgem complaints data.
• Rarely the cheapest on price, even on their fixed deals.
• Standing charges tend to sit at the higher end.

If you’re not already tied in via HomeCare, there are probably better choices.

OVO Energy

Best for: People who want something between Octopus and the old Big Six, particularly if you like a rewards scheme.

OVO sits in an awkward spot. It’s large (it absorbed SSE’s retail business a few years back), it supplies 100% renewable electricity on its standard tariffs, and it has a decent app and a reasonable customer score. But it’s not the cheapest, it’s not the highest rated, and it’s not the most innovative. In the Which? 2026 survey it scraped just over 60%, better than British Gas and EDF but well behind Octopus.

Pros

• OVO Plus rewards scheme gives you something back for being an existing customer, which is rarer than it should be.
• Renewable electricity as standard.
• Reasonable app and online experience.
• Good breadth of support options for vulnerable customers.

Cons

• Hasn’t been as competitive on price as Octopus or E.ON Next in early 2026.
• Customer satisfaction is middling rather than strong. Two stars for most categories in the Which? 2026 results.
• Their green credentials are REGO-based rather than genuinely additional, which matters if you care about impact over labelling.

Scottish Power

Best for: EV drivers in Scotland and northern England who want competitive off-peak rates from a domestic supplier.

Scottish Power has quietly climbed the Citizens Advice league table, sitting around 5th place with a 3.3/5 rating in the Q4 2025 data. It’s not Ecotricity, but it’s not EDF either. Their EV tariff options are competitive, and they’re 100% renewable on the electricity side. The 2026 Which? survey was less kind, putting them near the bottom alongside British Gas and EDF, so take your pick of which ranking you trust more.

Pros

• 100% renewable electricity as standard.
• Good EV tariff options.
• Improved customer service vs their old reputation, at least per Citizens Advice.
• Solid smart meter rollout.

Cons

• Which? 2026 survey rated them poorly across most service categories.
• Fixed deals rarely beat the market leaders on price.
• The two main customer service rankings disagree about them, which isn’t reassuring.

100Green (formerly Green Energy UK)

Best for: People who specifically want genuinely green gas, and are willing to pay more for it.

Here’s the thing about “green” gas. Almost every “green” tariff on the UK market is either offset-based, REGO-certificate-based, or just straight-up fossil gas with a green badge slapped on. 100Green is the rare exception. They supply genuinely 100% green gas from biomethane sources, and their electricity is 100% renewable from UK-based generators.

In the Which? 2026 survey 100Green received the highest customer score of any supplier (82%) and was named a Which? Recommended Provider.

Pros

• Genuinely green gas, not just green-label gas. This is genuinely rare.
• Top customer satisfaction scores in the 2026 Which? survey.
• Small enough to offer personal service.

Cons

• Typically more expensive than the price cap. You’re paying a premium for the green gas supply.
• Smaller operation, so less tariff variety than the bigger suppliers.
• Not a pick for anyone whose priority is cost.

Ecotricity

Best for: People who want their energy bill to fund new renewable generation, and who rate ethics over pennies.

Ecotricity sits right at the top of the Citizens Advice energy star rating league table for Q4 2025, taking first place for the second quarter running. It’s 100% renewable, reinvests profits into building new renewable capacity, and has a Which? Eco Provider badge five years in a row. If you care about where your money goes more than what you pay, this is probably your pick.

Pros

• Consistently top of Citizens Advice customer service rankings.
• Genuine reinvestment model. Your bill helps fund new renewables.
• Strong ethical credentials across the board.
• Which? Eco Provider accreditation.

Cons

• Rarely the cheapest, often noticeably above the cap on headline price.
• Limited tariff range compared to larger suppliers.
• No smart tariffs to speak of. If you want Agile-style wholesale-linked pricing, look elsewhere.

How to Choose the Right Supplier for You

Different households want different things from an energy supplier. Here’s a rough guide by situation.

If you want the cheapest possible deal. Look at Octopus Energy’s 12-month fix and E.ON Next’s range of fixed and hybrid tariffs. In early 2026 these have typically been the two cheapest mainstream options, and they swap the lead depending on the week. Given current wholesale volatility, it’s worth prioritising fixes with low or no exit fees so you’re not locked in if things shift. Run a comparison using your actual postcode, because regional variation is significant.

If customer service is your main priority. Ecotricity for Citizens Advice’s top ranking, 100Green for the highest Which? score, Octopus for the consistently excellent service at scale. Any of these are a safer bet than British Gas or EDF.

If you want genuinely green energy. This is where it gets interesting. If you care about green electricity, Octopus, Ecotricity, Good Energy and 100Green all qualify, though with different approaches to “renewable”. If you want green gas as well, realistically 100Green is one of a very small number of options actually supplying biomethane rather than offset gas.

If you have an EV. Octopus Intelligent Go is probably the strongest option going, with overnight rates well below the daytime rate. EDF’s EV tariffs and E.ON Next’s “Next Drive” are decent alternatives. You’ll almost certainly need a smart meter and a compatible charger.

If you have a heat pump. Octopus Cosy is designed around heat pump usage patterns, with cheaper rates during the times you’re most likely to be heating water. EDF’s heat pump tariff gives you discounted windows morning and afternoon. Both worth a look.

If you’re on prepayment. Your choices are narrower but still real. The prepayment cap is set at £1,597 for April to June 2026. Utilita specialises in prepayment and has a large customer base on it. Octopus, E.ON Next and British Gas all offer prepayment options as well. Customer service rankings for prepayment-heavy suppliers tend to be lower, so tread carefully and read current reviews before committing.

If you just want a quiet life. Octopus, honestly. The Flexible tariff is simple, the service is consistent, and you won’t feel like you need to obsessively re-switch every year.

How Switching Works (the Short Version)

Switching is genuinely not the hassle people imagine. You pick a new supplier, usually through a comparison site or directly on their website, and they handle the rest. Your supply is never interrupted. The gas and electricity coming out of your pipes and wires doesn’t change at all, only who bills you for it.

The Energy Switch Guarantee means most switches are completed within five working days, and you’ll usually get a meter reading request around the switch date. If you’re in credit with your old supplier, they should refund you. If you’re in debt to them by less than £500 on a Direct Debit, you can still switch, although larger debts can complicate things.

Are Green Tariffs Actually Worth It?

Here’s where I might be slightly unfair, but bear with me. The term “green tariff” is doing an awful lot of work in UK energy marketing, and most of it isn’t particularly honest.

There are roughly three categories. The first is genuinely renewable, where a supplier owns or has Power Purchase Agreements with actual wind farms and solar installations, and the electricity you pay for is matched in real terms by renewable generation they’ve paid to build or contract. Octopus, Ecotricity, Good Energy and 100Green are broadly in this camp.

The second is REGO-backed, where a supplier buys Renewable Energy Guarantees of Origin certificates to match their supply. These certificates are cheap, typically under £1 per household per year, which tells you something about how much real-world impact they represent. Technically the electricity counts as “100% renewable”, but the supplier hasn’t meaningfully paid for new renewable generation. OVO, EDF’s renewable tariffs, and most “green” options from the larger suppliers fall here.

The third is offset-based, particularly for gas, where the supplier claims “carbon neutral gas” by buying offset credits. The quality of those offsets varies wildly. Some are legitimate, many are not.

Is the premium for genuinely green energy worth it? If your priority is reducing household carbon emissions, probably not, because the biggest lever by miles is how much energy you use rather than who you buy it from. But if you want your money to support the expansion of UK renewable capacity, then yes, and you should pick a supplier that actually invests in generation rather than just ticks a certificate box.

For more on how generation and tariffs connect, Which? have a useful breakdown of energy company credentials worth a read before you decide.

FAQ

Who is the cheapest energy supplier right now? In early 2026 it’s been a toss-up between Octopus Energy’s 12-month fix and E.ON Next’s hybrid and fixed tariffs. Both have typically sat below the Ofgem price cap for most postcodes. But availability is shifting fast because of the wholesale market turmoil linked to the Iran crisis, and some of the cheapest fixes that were around in January and February have been withdrawn or repriced. Always run a comparison for your actual address, and be ready to act quickly if you spot a good deal.

Is Octopus Energy actually the best? For most households, in terms of combining price, service, and tariff innovation, probably yes. But not always. If you want a genuinely green gas supply you’ll want 100Green. If you want the highest-rated customer service regardless of anything else, Ecotricity tops the Citizens Advice table. And E.ON Next occasionally beats Octopus on headline price. “Best” depends on what you actually care about.

What happens if my supplier goes bust? Ofgem has a Supplier of Last Resort process. Your supply continues uninterrupted, you get moved to a new supplier automatically, and any credit balance is protected. This is exactly what happened when Bulb collapsed and when Shell Energy’s retail arm was sold to Octopus in late 2023. Not pleasant, but not catastrophic. Citizens Advice has a useful guide on what to do if your supplier goes bust that’s worth bookmarking.

Can I switch if I’m in debt to my current supplier? Usually yes, provided the debt is under £500 and you pay by Direct Debit. Larger debts will need to be cleared first, or you may need to stay with your current supplier until the debt is managed. Don’t let debt stop you from exploring your options though. Contact your supplier first, set up a repayment plan, and then review.

Do I need a smart meter to switch supplier? No, you don’t need one to switch. But you will need one to access most of the interesting tariffs, particularly smart tariffs like Octopus Agile, Tracker, or Intelligent Go. If you’re switching to a basic fixed or variable tariff, a traditional meter is fine.

Conclusion

If you’ve made it this far, here’s the short version by reader type.

If you want the best all-round option with minimal fuss, Octopus Energy is the obvious answer for 2026. Cheapest isn’t guaranteed, but it’s consistently competitive, the service is the best at scale in the UK, and the tariff range is miles ahead of the rest.

If you want the lowest headline price, compare Octopus against E.ON Next in your specific postcode and pick whichever comes out cheaper on the day.

If you want genuinely green energy (especially green gas), 100Green or Ecotricity are worth the premium, and both are rated better for service than any of the big legacy suppliers.

If you’re stuck with British Gas, EDF or Scottish Power because that’s who you’ve always been with, and you’re not actively using HomeCare or a specific feature you’d miss, you’re probably overpaying on both price and service. Worth at least running a comparison.

And remember that rankings change, tariffs get withdrawn, and the price cap resets every three months. Check current deals before you sign, and don’t feel bad about moving again in a year if something better comes along.

For a broader guide on everything else you can do to bring your bills down (not just picking a supplier), see How to Actually Slash Your Energy Bills. And if your bills feel high even after switching, the real culprit might be usage rather than supplier, in which case Why Are My Energy Bills So High? is probably where to go next.