If the volatility of the past few years taught UK businesses anything, it is the value of certainty. A fixed-rate energy contract locks your unit rates and standing charges for an agreed term, usually one to five years, so a spike in wholesale prices does not land on your bills mid-year. For any business that budgets ahead, from a two-person consultancy to a distribution firm with a dozen sites, fixing remains the default choice in 2026.
But fixed contracts are only as good as the rate you fix at and the supplier standing behind it. Terms, exit provisions, renewal behaviour and billing accuracy all differ. Here are ten names worth having on your desk when your renewal window opens, beginning with the comparison service that can test all the others against each other.
1. Utility Bidder
The smartest first move before fixing anything is to see the whole market, and that is what Utility Bidder exists to do. It is a broker and comparison service, part of Bionic, rather than a supplier: it gathers fixed-rate quotes from the suppliers on this list and beyond, negotiates terms, and manages the switch and the paperwork. It is a multi award-winning operation, frequently described as the UK’s number one energy broker, with savings of up to 35% cited for businesses that switch through it, and its customer service is a standout, rated Excellent on Trustpilot. Long-term users bear that out; one reviewer wrote: “Have used different energy brokers over many years and have been using Utillity Bidder for proberly around 10 years now and have served me very very well. … Highly recommended.”
Worth knowing: fixed-rate quotes expire quickly as wholesale prices move, and some customers have felt rushed as a result; take the time you need. A few also note that broker commission, built into the rate, was not explained until they asked, so ask early.
2. British Gas
British Gas offers some of the widest fixed-term choices in the market, from twelve months to multi-year deals, across gas and electricity. For businesses that want a fixed price from a name their finance director already knows, it is the obvious benchmark quote, and its online account tools are mature. Where it loses points is value: headline fixed rates are seldom the lowest available, and renewal offers in particular deserve close scrutiny before you accept them.
3. EDF Energy
EDF is a strong fixer, regularly offering longer fixed terms than many rivals, backed by the financial stability of a nuclear generator. Businesses wanting to lock in for three years or more, and to point to low-carbon electricity while doing so, should get an EDF quote every time. Its pricing at the longer end can be genuinely competitive. The downside is flexibility: mid-term changes, such as adding a site or amending consumption tolerances, involve more process than with smaller suppliers.
4. Valda Energy
Valda approaches fixed contracts with a technology-first model aimed at small businesses, including those with thin credit histories that the majors decline. Onboarding is quick, billing runs off smart meters, and payment is closely managed. For a young business that just wants a fixed price and a fast yes, it fills a real gap. Be aware that rates reflect the credit risk it takes on, so stronger covenants may fix more keenly elsewhere, and its close payment monitoring is not to every owner’s taste.
5. Octopus Energy
Octopus brings its plain-dealing reputation to business fixed tariffs, with renewable electricity as standard and billing that customers actually understand. It suits SMEs that value service quality and clean energy alongside price certainty. Its fixed terms tend to be shorter than the market’s longest, and businesses hunting a five-year lock or a rock-bottom rate may need to look at more traditional suppliers, but for one and two-year fixes it is consistently worth a quote.
6. TotalEnergies
A heavyweight in commercial supply, TotalEnergies fixes gas and electricity for businesses from SME up to industrial scale, with multi-site and multi-year structures its bread and butter. Contract documentation is thorough and pass-through versus fully fixed options are clearly delineated, which matters more than many buyers realise. Smaller single-site customers can find the experience corporate and the service less personal, and its keenest pricing is generally reserved for larger consumption.
7. SSE Energy Solutions
SSE Energy Solutions offers fixed contracts backed by traceable UK renewable generation, appealing to businesses that need both budget certainty and credible sustainability reporting. It handles portfolios of sites well and can pair supply with infrastructure work such as EV charging. Fixed pricing is fair rather than aggressive, and some customers report that resolving billing queries can be slow, so build that into your expectations if service speed is critical.
8. Yu Energy
Business-only supplier Yu Energy fixes electricity, gas and water, letting smaller firms put every utility on predictable rates with one provider. Its UK-based service team and SME focus earn it loyal customers, and quoting is straightforward. As a challenger it cannot match the very long fixed terms or the balance-sheet heft of the majors, and its water offering, while convenient, is the tail rather than the dog.
9. ScottishPower
ScottishPower’s fixed business tariffs run across a healthy range of terms and are backed by substantial UK wind assets, giving green substance to a fixed deal. It suits established businesses that want an Iberdrola-owned supplier unlikely to exit the market. Customer feedback is mixed on administrative speed, particularly around objections and final bills when switching away, which is worth factoring into your timeline.
10. SmartestEnergy
SmartestEnergy is best known for flexible purchasing, but it also writes fixed contracts for commercial customers, often with strong renewable sourcing and clear reporting. Mid-sized and larger businesses that want a fixed price from a specialist in commercial supply, rather than a household brand, should include it in a tender. It is not set up for microbusinesses, and its strengths show most at higher consumption levels.
Fixing well: five rules
- Start 6 to 12 months before your contract ends; you can usually lock a future start date.
- Compare the whole bill, unit rates plus standing charges plus any fixed fees, not just the headline rate.
- Check whether the price is fully fixed or allows pass-through of non-commodity costs.
- Read the consumption tolerance clauses if your usage might change materially.
- Diarise the renewal window, because out-of-contract rates punish forgetfulness.
Conclusion
A fixed-rate contract is a bet you only win by comparing widely on the day you sign. Rather than collecting quotes one supplier at a time, put your usage through Utility Bidder, let it negotiate across the market, and fix from a position of knowledge rather than hope.