The Ofgem 17-day switching commitment for non-domestic energy customers exists. It is published, it is enforced through the supplier licence conditions, and it works in roughly 80-85% of cases. The remaining 15-20% break at one of five specific points, and a business that does not know the failure modes can find itself paying deemed rates for months after the switch was supposed to complete.
TL;DR
- Ofgem's switching commitment requires non-domestic energy switches to complete within 17 working days for most microbusiness and small business customers.
- The renewal window for business contracts typically opens 120 days before contract end and closes around 30 days before, depending on supplier terms.
- The 14-day cooling-off period applies to most distance-sold microbusiness contracts under the Consumer Contracts Regulations 2013.
- Outstanding debt of more than 28 days standing is a lawful objection ground that lets the current supplier block the switch.
- Deemed-rate contracts apply between supplier hand-off events and tend to sit 30-50% above the average fixed rate in the market.
Last reviewed: May 2026
The Ofgem 17-day switch commitment, in detail
The headline figure most businesses hear from a broker or new supplier is "your switch will be done in 17 days". That figure is real. The 17-working-day switch commitment was introduced under Ofgem's faster switching programme and applies to most non-domestic gas and electricity transfers. The clock starts on the day the customer formally signs the new contract and the new supplier registers the change with the central settlement systems (MPAS for electricity, Xoserve for gas).
The 17 working days break down approximately as follows: a 14-day cooling-off window (for distance-sold microbusiness contracts), a registration window in which the new supplier files the change-of-supplier flow with the data services provider, an objection window in which the existing supplier can lodge a valid objection, and a final switchover day on which the meter responsibility transfers.
The Energy Switch Guarantee, which sits alongside the Ofgem commitment, gives customers a separate redress route if a switch goes wrong. The Citizens Advice energy supply pages and the Ofgem switching guidance set out the formal process steps.
For a microbusiness without contract debt, without a smart-meter compatibility issue, and not in the middle of a change of tenancy, 17 working days is a realistic timeline. The catch is that any one of those three preconditions failing pushes the switch out by weeks or, in awkward cases, months.
Where the switch actually breaks: five failure modes
Across the Ofgem switching data published quarterly on the energy data portal, the failure modes that cause non-domestic switches to overrun or fail cluster into five categories.
1. Objection raised on debt grounds
The existing supplier has a lawful right to object to a switch if the customer has outstanding debt that has been due for more than 28 days. The 28-day rule is not arbitrary; it is set out in the supplier licence conditions and reflects the principle that a supplier should not be forced to release a customer who owes them money. The objection is filed with the data services provider, the switch is blocked, and the customer is notified.
In practice the objection window is the most common cause of a switch failing in the first attempt.
The fix is to clear the debt (or agree a repayment plan that the existing supplier accepts as adequate) and resubmit the switch. If the customer disputes the debt, the Energy Ombudsman has a formal route for non-domestic disputes through its energy sector pages.
2. Outside the renewal window
Business energy contracts are not perpetually switchable. A 24-month fixed contract signed in June 2024 cannot be switched in October 2025 without paying an early-termination fee, because the customer is still inside the fixed term.
The renewal window is the period in which the customer can sign a new contract (with the same or a different supplier) without paying an early-termination fee, and it typically opens 120 days before the current contract end date and closes anywhere from 30 to 1 day before contract end, depending on the supplier's renewal terms.
Here is where it breaks: a microbusiness that misses the renewal window cut-off finds itself rolled onto either a deemed contract (if the supplier offers one) or a default out-of-contract rate (if the contract terms require it). Both routes sit well above the market.
3. Smart meter compatibility
The non-domestic smart meter rollout under DESNZ's policy programme has installed SMETS2 meters across most of the UK SME estate, but compatibility issues remain. A meter that was working under the previous supplier's head-end system can stop sending half-hourly reads when the supplier changes if the new supplier's data services contract does not include the specific meter model.
A switch can complete on the central settlement systems while the meter remains effectively dumb to the new supplier. The customer gets a switch confirmation letter, the new supplier issues invoices based on estimated reads, and the discrepancy surfaces 90-120 days later when the first manual read is taken.
A 14,000 kWh per year coffee shop in the East Midlands switched in February 2026 spent 11 weeks on estimated bills after the SMETS2 meter dropped from the new supplier's network. The eventual reconciliation produced a 280-pound credit, which is not catastrophic, but the cash-flow disruption mattered.
4. MPAN or MPRN data issues
Every UK electricity supply has a 21-digit MPAN (Meter Point Administration Number); every gas supply has an MPRN. The number is the unique identifier the data services systems use to route the switch.
If the MPAN or MPRN on the new contract does not match the central settlement data exactly, the switch flow rejects. The most common cause is a transcription error on the new contract, or a recent change-of-tenancy where the central data has not been updated. The Citizens Advice consumer pages and the Ofgem business energy advice pages cover the verification step.
The fix is to take the MPAN and MPRN directly from the most recent bill (not from a broker-supplied site list) and verify the address match before signing the new contract.
5. Change of tenancy timing
A switch initiated in the same week as a change of tenancy almost always fails. The supplier on the day the new tenant moves in is the supplier on the deemed contract for the new occupier, not the supplier the previous tenant had selected.
The clean route for a new tenant is to register with the existing supplier first (which puts the new tenant onto a deemed contract at deemed rates), then initiate a switch from that deemed contract to the chosen supplier. The Ofgem guidance on change of occupier sets out the formal steps.
| Failure mode | Typical resolution time | Primary fix |
|---|---|---|
| Debt objection (28+ days) | 2-6 weeks once debt cleared | Clear debt or agree repayment plan, resubmit switch |
| Outside renewal window | Until contract end, then 17 working days | Calendar the 120-day renewal trigger from contract start |
| Smart meter compatibility | 4-12 weeks for read normalisation | Confirm meter model is on new supplier's data services contract |
| MPAN or MPRN mismatch | 1-3 weeks | Verify supply number from most recent bill before signing |
| Change of tenancy clash | 4-8 weeks | Register with deemed supplier first, then switch |
The deemed-rate transition: where money quietly leaks
Between two contracted periods, between a change of tenancy and a chosen-supplier contract, between a contract end and a renewal sign-off, the customer sits on a deemed contract. A deemed contract is the rate the supplier charges anyone who is consuming energy through their network without an active negotiated contract.
Deemed rates in May 2026 tend to sit roughly 30-50% above the average fixed-contract rate for the same site profile. For a microbusiness on a 30p per kWh fixed rate, the deemed equivalent is often in the 40-46p per kWh band, with a higher standing charge attached.
Ofgem requires suppliers to publish their non-domestic deemed rates and to operate a "principle of fairness" on deemed pricing, but there is no Ofgem cap on the deemed rate. The supplier sets the rate, publishes it, and applies it. The customer's only escape from a deemed rate is to sign a new fixed contract (with the same supplier or a different one) and complete the switch.
The renewal window calendar: how to not miss it
Most non-domestic energy contracts include a renewal notification clause. The supplier must, under licence conditions for microbusinesses, issue a written renewal notification to the customer at the start of the renewal window. The notification sets out the new rates available from the current supplier if the customer takes no other action.
The catch is that the notification often arrives by post or email to whichever contact was on the original contract. If the business has changed bookkeeper, moved address, or simply lost the email in a busy inbox, the notification can pass without action. Ofgem's microbusiness renewal rules require a clear written notice; they do not require the supplier to chase a non-response.
The working method is to put two calendar reminders on the operations diary the day the contract starts: one at contract-end minus 120 days, one at contract-end minus 60 days. The 120-day reminder triggers the quote exercise. The 60-day reminder triggers the contract signing if a switch is the chosen route. Both reminders together prevent the auto-roll onto a renewal rate that, in practice, sits 15-30% above what was available on the open market.
What 17 days actually looks like, day by day
For a microbusiness that signs a new contract on day zero with no debt, no MPAN issues, and no change of tenancy, the 17-working-day timeline usually proceeds as follows. Day zero: contract signed. Days one to fourteen: cooling-off window for distance-sold microbusiness contracts. Day fifteen: new supplier registers the change-of-supplier with the central data services provider. Day fifteen to sixteen: existing supplier confirms no objection. Day seventeen: meter responsibility transfers to the new supplier, first invoice issues from the new supplier within the following 30 days. The Ofgem business switching guidance carries the formal day-by-day flow.
The Northern Ireland market operates on a different framework (the Utility Regulator NI rather than Ofgem), and the 17-day commitment as such does not apply.
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
How long does a business energy switch take in the UK in 2026?
For a microbusiness or small business with no debt and no meter issues, the Ofgem switching commitment requires 17 working days from contract signature to meter handover. Switches outside that window are usually delayed by debt objections, meter compatibility, or change-of-tenancy timing.
Can a business switch energy supplier mid-contract?
Not without paying an early-termination fee, in most cases. The exception is the renewal window (typically the final 120 days of the contract) during which a new contract can be signed without termination charges.
What happens if the existing supplier objects to the switch?
The switch is paused until the objection is resolved. The most common ground is outstanding debt of more than 28 days. The customer can clear the debt, agree a repayment plan, or dispute the objection through the Energy Ombudsman.
What is a deemed contract?
A deemed contract is the rate a supplier charges a customer consuming energy through their network without an active negotiated contract, typically applied during change-of-tenancy or after a contract end with no replacement. Deemed rates in May 2026 sit substantially above the average fixed-contract rate.
Does the 14-day cooling-off period apply to business contracts?
The 14-day cooling-off period under the Consumer Contracts Regulations 2013 applies to most distance-sold microbusiness contracts. It does not apply to contracts signed in person at the supplier's premises, and the position for larger non-microbusiness contracts is not the same.
Where does Northern Ireland fit?
Northern Ireland's energy market is regulated by the Utility Regulator NI, not Ofgem. The 17-day switching commitment as set out in Ofgem licence conditions applies to GB only; NI customers should check the Utility Regulator's published switching guidance.
Sources
- Ofgem - Energy advice for businesses, switching and 17-day commitment
- Ofgem - Energy data portal, switching statistics Q1 2026
- Citizens Advice - Energy supply, switching guidance
- Ombudsman Services - Energy, microbusiness dispute resolution
- legislation.gov.uk - Consumer Contracts Regulations 2013
- DESNZ - Smart meter rollout policy and non-domestic guidance
