Most UK businesses are moved onto expensive deemed or out-of-contract rates simply because they missed a renewal deadline. It is rarely a complex problem — it is almost always a timing problem. Knowing exactly when your business energy renewal window opens, and how long you have to act, puts you back in control of one of your largest overhead costs.
Where to Check Your Contract End Date
Start with your most recent energy bill. Suppliers are required to display your contract end date, and many now print it prominently on the first page or the summary section. If you receive e-bills, log into your supplier portal and look under "account details", "tariff information", or "contract summary".
If you cannot find the date on your bill or portal, call your supplier's business accounts team directly and ask for your contract end date and your notice period in writing. Keep a copy of that response — you may need it if there is a dispute later.
Your original contract documents are also a reliable source. When you signed up, you should have received a terms and conditions document specifying both the contract duration and the notice requirements.
Understanding Termination Notice Rules
This is where many SME owners are caught out. Even if you know your contract end date, failing to serve notice within the required window can trigger an automatic rollover — often for another 12 months at whatever rate the supplier sets.
Notice periods vary by supplier but typically fall between 30 and 90 days. Some suppliers require notice no later than 30 days before the end date; others start the clock as early as 90 days out. A few contracts specify that notice must be served during a specific window — for example, between 60 and 90 days before expiry — making it possible to both serve notice too early and too late.
Always check whether notice must be submitted in writing, by recorded post, or via a specific online form. An email to a general inbox may not constitute valid notice under your contract terms.
What to Prepare Before You Compare
Once you know your renewal window is open, gather the information you will need to compare the business electricity and gas market accurately.
- Annual consumption figures — shown in kWh on your bill, split by gas and electricity
- Meter details — your MPAN (electricity) and MPRN (gas) reference numbers
- Current unit rate and standing charge — so you have a genuine baseline for comparison
- Site details — whether you have a half-hourly meter, multiple sites, or any specific supply requirements
- Payment method — direct debit typically attracts better rates than credit terms
Having this information to hand means any quotes you receive are based on accurate data, not estimates that could change at renewal.
Why Diarising Your Business Energy Renewal Window Matters
A missed business energy renewal window is not a minor inconvenience. Out-of-contract rates can run significantly above the market rate, and you may be stuck on them for weeks or months while you work through a switching process.
Set a calendar reminder at least 120 days before your contract end date — well before the notice period closes. That gives you time to gather your usage data, compare business energy suppliers, and serve notice if you choose to switch, all without rushing.
If you manage multiple sites or have both gas and electricity contracts, stagger your reminders so each renewal is tracked individually. Contract end dates do not always align, even with the same supplier.
Action Checklist
- Locate your contract end date on your bill, supplier portal, or original contract documents
- Call or email your supplier to confirm the exact notice period required in writing
- Note the earliest and latest dates you can serve termination notice
- Set a calendar reminder 120 days before the end date as your prompt to start comparing
- Gather your annual kWh consumption, MPAN/MPRN numbers, and current tariff details
- Confirm how notice must be served — post, email, or online form — and keep a copy
- Begin comparing at least 60 days before the contract end date so any switch can complete in time
