A business energy contract is binding for its full term, and the working assumption in the UK non-domestic market is that mid-contract switching is not available on demand. There are four narrow situations where a mid-contract change becomes possible, each with its own paperwork trail. Outside those situations the realistic move is to line up a forward-fixed renewal so the new supply is ready to start the day the existing contract expires.
TL;DR
- Mid-contract switching is not a general right under UK non-domestic energy contracts; the supplier must consent or be in breach.
- Supplier insolvency triggers the Ofgem Supplier of Last Resort process; customers are transferred automatically and the new supplier sets a fresh tariff.
- Change of tenancy can end a contract early at the supply point, but only the outgoing occupier exits, not the contract itself.
- Misselling complaints can route through the Energy Ombudsman where the customer is a microbusiness; remedies can include contract release.
- Forward-fixing a renewal up to 12 months ahead of expiry is the most common substitute for a mid-contract switch.
Last reviewed: May 2026
The general rule: business contracts run their term
A non-domestic energy contract is a private commercial contract under English, Welsh, Scottish or Northern Irish law as relevant. Unlike domestic supply, it is not subject to the Ofgem 14-day cooling-off that covers household switches under the retail energy code, except in the narrow microbusiness telephone-sales scenario. Once the contract is countersigned and the cooling-off window has closed if applicable, the customer is bound for the full term.
Term lengths in the UK SME market sit between one and five years on fixed contracts, with three years a common default.
The practical implication is that switching mid-contract requires either supplier consent, supplier breach, or a structural change at the supply point.
Early termination fees and how they are calculated
Where a supplier does consent to early release, the cost is structured as an early termination fee, sometimes called an exit fee. The fee is typically the supplier's calculation of expected lost margin across the remaining term. It is expressed either as a fixed sum, a per-kWh charge applied to forecast residual consumption, or a percentage of forecast residual revenue. There is no statutory cap on this figure for non-domestic contracts. A site one year into a three-year deal at 28p per kWh, consuming 60,000 kWh per year, can face a stated termination figure measured in thousands of pounds rather than hundreds. The calculation methodology is usually buried inside the contract terms schedule rather than headlined in any quote. Suppliers vary widely on whether they will negotiate the calculation or hold to the figure. A site that intends to switch early should ask for the termination figure in writing before committing to anything new.
The figure is not always negotiable, but it is always specific to the contract.
The catch is that the early termination fee is calculated against the original contracted unit rate, not the current market rate. If wholesale gas has fallen since the contract started, the customer can be paying a premium and still owe a fee to leave, because the supplier values the lost margin against the locked-in price.
Supplier insolvency and Supplier of Last Resort
Where a supplier ceases trading, Ofgem operates the Supplier of Last Resort process. Ofgem appoints a replacement supplier under its published SoLR framework, and existing customers are transferred automatically with continuity of supply. The replacement supplier sets a new tariff for the transferred customers, typically a deemed contract at the point of transfer, and writes to the customer with the new terms within a defined notice period.
The 2021 and 2022 wave of UK domestic supplier failures and the smaller non-domestic supplier exits that followed established the SoLR pattern that is still operative in 2026. Bulb's special administration regime was a separate route specific to that case, but the SoLR template covers the general scenario.
For a business customer the SoLR transfer is the one path that genuinely changes the supplier without notice, consent, or fee. The trade-off is that the deemed rate set by the appointed replacement is rarely competitive, and the customer's next move is usually to switch out at the earliest available point.
Change of tenancy: the supply point exit
Change of tenancy is the second structural exit, and it is widely misunderstood. The rule is that when the occupier of a premises changes, the outgoing occupier's responsibility for the supply ends on a defined departure date. The contract itself does not transfer to the new occupier automatically. The incoming occupier becomes liable for supply from the day they take occupation, usually on a deemed contract until they sign their own deal.
This is not a switching mechanism for an ongoing business at an ongoing site. A business that takes over a new lease at a new address can sign a fresh contract for that supply point with any supplier, but the old contract at the old address still has to be closed out under the change-of-tenancy procedure.
The trap appears where the business is moving from one premises to another but staying in the same lease. The supplier can argue that the move does not constitute a genuine change of tenancy at all and the contract still runs.
Mis-selling complaints and the Ombudsman route
A microbusiness mis-sold a contract can complain to the supplier and, if unresolved after eight weeks or formally deadlocked, escalate to Ombudsman Services Energy. The Ombudsman can require remedies including written apology, contract amendment, compensation, and in defined cases release from the contract.
Mis-selling claims that succeed typically involve a clear evidential trail. A recorded telephone sale where the supplier or broker stated incorrect contract length, incorrect unit rate, or incorrect termination terms is the strongest pattern. Vaguer complaints about "felt pressured" are harder to evidence.
In practice the Ombudsman route works best where the contract is less than 12 months old and the complaint paperwork has been kept tidy from the start.
Forward-fixing a renewal: the soft "switch ahead"
The most common substitute for a mid-contract switch is to forward-fix a renewal with a new supplier well before the existing contract expires. Most non-domestic suppliers will quote and contract up to 12 months ahead of the supply start date. The customer signs a new contract that begins the day after the existing contract ends, and the change happens automatically at the meter.
Forward-fixing locks in current pricing for a future supply period. In a falling wholesale market this is a downside; in a rising one it is the entire point. During the 2022 and 2023 wholesale spike, businesses that had locked in 18 months ahead in 2021 saved meaningful sums while businesses that had let contracts run to expiry into the spike paid spot-aligned out-of-contract rates.
The forward-fix decision is essentially a market view, not a regulatory question, and the data set that supports it is the wholesale forward curve plus the supplier risk premium loaded on top.
Comparison: routes out of a business energy contract
| Route | Triggered by | Cost | Time to switch |
|---|---|---|---|
| Negotiated early release | Supplier consents | Early termination fee, often four figures | 4 to 8 weeks after fee paid |
| Supplier of Last Resort | Supplier insolvency, Ofgem appointment | None at transfer, deemed rate after | Automatic, typically days |
| Change of tenancy | Occupier changes at premises | None for ongoing contract, deemed rate for incoming party | Effective on departure date |
| Ombudsman remedy for misselling | Mis-sold microbusiness contract | None if upheld | 8 weeks plus Ombudsman timeline |
| Forward-fixed renewal | Customer choice ahead of expiry | None if signed inside window | Effective day after current contract ends |
Regional and meter-type variables
Half-hourly metered sites face an extra layer. A site on a half-hourly electricity meter has a meter operator contract and a data collector contract sitting alongside the supply contract, and these can run on separate term lengths. A switch of supplier on a half-hourly site needs the meter operator arrangement to be aligned too.
Northern Ireland sits outside the GB regulatory regime entirely. The Utility Regulator (UREGNI) covers Northern Ireland under its own non-domestic rules, and the SoLR process there is structured separately from Ofgem's.
Scottish business sites use the same Ofgem rulebook as English and Welsh ones at the regulator level, but distribution charges differ region by region across the 14 GB distribution areas, and a forward-fixed quote from one supplier in MANWEB will not match the same supplier's quote in Southern Electric.
The realistic mid-contract switching playbook
The pattern that works in 2026 is to assume the contract runs to term, to track the renewal window precisely, and to start the forward-fixing exercise at least six months before expiry. Sites that combine that schedule with primary-source verification of any quoted rate against the supplier's published business tariffs rarely end up arguing about mid-contract exits at all.
For the rest, the four exits remain available where they apply, and the Ombudsman remains the route of last resort for the microbusiness segment. The DESNZ March 2026 statistical release on non-domestic energy prices is the public benchmark for whether a forward-fixed offer is in or out of line with the broader market average.
A site that ignores the renewal letter and lets the contract roll out of contract gets the worst of every world. Out-of-contract unit rates can sit 30 to 50 per cent above any negotiated fixed offer, and the standing charge component can sit higher still.
Editorial disclaimer. KaelTripton is an independent UK publisher. This article is editorial, not personal financial or energy procurement advice. Rates, caps, grant levels and supplier offers move; verify any figure with the named primary source before acting on it. KaelTripton does not earn commission from suppliers or brokers mentioned.
Frequently asked questions
Can a business energy contract be cancelled within 14 days?
Only for microbusinesses where the contract was concluded by telephone. The 14-day cooling-off applies in that scenario under Ofgem Standard Licence Conditions and does not extend to face-to-face or non-microbusiness contracts.
What happens to a contract if a supplier goes bust?
Ofgem appoints a Supplier of Last Resort. Customers transfer automatically with continuity of supply, typically onto a deemed tariff set by the new supplier.
Is the early termination fee always payable?
If the supplier consents to early release, the fee stated in the contract or in the supplier's release calculation is the figure due. The fee is rarely waived, although the calculation methodology can sometimes be questioned.
Does a change of tenancy automatically end the contract?
It ends the outgoing occupier's responsibility at the supply point, but the contract itself does not move to the new occupier unless they choose to take it on.
How far ahead can a business forward-fix a new contract?
Most non-domestic suppliers accept forward-fixed renewals up to 12 months before the supply start date, although the available term length and pricing depend on the supplier and the market at quote time.
Can the Energy Ombudsman release a mis-sold contract?
For microbusinesses, yes. The Ombudsman can require remedies including contract release where the evidence supports a mis-selling finding.
Sources
- Ofgem - energy policy and regulation (Supplier of Last Resort framework, May 2026)
- Ofgem - energy advice for businesses (May 2026)
- Ombudsman Services Energy - non-domestic complaints scope (accessed May 2026)
- DESNZ - energy prices statistics, March 2026 release
- Citizens Advice - energy supply, business contracts (May 2026)
- Ofgem - non-domestic third party intermediary rule changes, 2024 to 2026
