The mechanics of a standard switch
When you sign a new contract with a different energy supplier, you're not actually choosing who physically delivers gas or electricity to your property. The pipes and cables that bring energy to your home belong to the regional distribution network, not to your supplier. Your supplier is effectively your account manager — they buy energy on wholesale markets, manage billing, and handle customer service. Switching supplier changes who manages your account, not the physical infrastructure.
The 17-day window exists because: days 1–14 are your cooling-off period (you can cancel without penalty during this time); days 15–17 are when the actual meter transfer is processed through the central registration system. The outgoing supplier cannot object to a switch unless there's an outstanding debt on the account.
For smart meter customers, the switch is managed through the DCC network. The new supplier sends an enrolment request, the meter updates its communication target, and you may receive a notification on your IHD that the meter is now associated with the new account. For older non-smart meters, a reading is taken on the day of transfer — either by a meter reader visit or by you submitting a reading through both suppliers' websites on the agreed transfer date. Submitting an accurate reading on the switch date is the single most important action to take, as it ensures both your final bill from the old supplier and your first bill with the new one start from the same figure.
When switching is straightforward — and when it isn't
For homeowners or renters who set up their own account at move-in and have been paying without arrears, switching is typically uncomplicated. OFGEM's rules require suppliers to confirm a switch date within 5 working days of the contract being signed, and to compensate you if they fail to switch on time.
The picture is different if you inherit an account. When you move into a property, the energy supply defaults to the existing supplier — this is called the deemed contract, and the terms are usually the supplier's default tariff, which is capped by the OFGEM price cap but is rarely the cheapest available option. You have 28 days from move-in to switch without paying an exit fee on the deemed contract, but if you miss that window and the supplier's tariff has an exit fee, you may owe it if you switch before the contract term ends.
Outstanding debt on the account is the most common obstacle to switching. If the previous tenant left a debt with the supplier, and that debt has been associated with the meter rather than the individual through a process called "debt assignment," the supplier can block a switch until the debt is resolved. This shouldn't happen under correct OFGEM practice — personal debts should follow the individual, not the meter — but meter-associated legacy debt disputes are one of the more persistent complications in the switching process and can add weeks of delay.
When switching is actually worth the effort
This is the question most comparison guides skip. In periods of high energy market volatility — such as 2021–2023 when wholesale gas prices spiked dramatically — fixed-rate tariffs offered by new suppliers were often more expensive than the OFGEM-capped default tariff. Switching actively cost people money during that period. In a more stable market, the calculus changes: fixed rates can provide certainty below the variable cap, and some suppliers consistently offer standing charge structures that suit certain usage patterns more favourably.
We're not saying you should always switch at every opportunity. The time cost of comparing, switching, and managing the transfer is real. For most renters, the price difference between tariffs within the OFGEM cap framework is often smaller than it appears, particularly for households using below-average amounts of energy. Where switching typically makes the biggest difference is: if you inherited a deemed contract and have never actively chosen a tariff; if a supplier is offering a fixed tariff materially below the current cap level; or if you have a specific preference, such as a 100% renewable supply tariff, that your current supplier doesn't offer.
Exit fees and the renter's dilemma
Fixed-rate energy tariffs almost always carry an exit fee — typically £25–£50 per fuel — if you leave before the contract end date. Variable rate tariffs, including the default deemed contract, generally have no exit fee. This matters for renters because your tenancy may end before your energy contract does. If you're on a one-year fixed tariff and your landlord serves notice at month 8, you face either paying the exit fee or continuing the contract until it ends — except you've moved out.
The practical guidance: if you're renting on a periodic or short-term tenancy, be cautious about long fixed-rate contracts. A 12-month fixed rate started in October will end the following October — if there's any chance you'll move before then, a variable tariff with no exit fee gives you more flexibility, even if the per-unit rate is slightly higher at the time you sign.
Dual-fuel versus separate contracts
Most suppliers offer a dual-fuel tariff that bundles gas and electricity into one account. This simplifies billing — one account number, one bill, one contact for queries — and sometimes comes with a small discount compared to separate single-fuel contracts. The trade-off is that you lose the option to use different suppliers for gas and electricity, which occasionally matters if one supplier has a notably better tariff for one fuel type.
For most renters, dual-fuel from a single supplier is the simpler and usually the financially comparable choice. The scenarios where separating them is worthwhile are narrow: very high gas usage in a large property, or an off-gas-grid property where a different fuel type (oil, heat pump) is used for heating.
How Arrival handles switching
If you're registered with Arrival, your energy account is managed through OFGEM-registered suppliers in your region, and Arrival handles the day-to-day billing and supplier relationship on your behalf. If a better tariff becomes available — or if your existing tariff ends and you're moved to a less favourable default — Arrival flags this and can manage any switch on your behalf, including meter reading coordination and the transfer period. You stay on one monthly direct debit throughout; the underlying supplier change is handled in the background without you needing to engage with the switching process directly.
Energy switching is a legitimate tool for managing household costs. Knowing what the process involves — and what the realistic complications are for renters specifically — means you can make an informed call about when it's worth doing, rather than either ignoring it entirely or chasing every price comparison notification that lands in your inbox.