How to switch business energy supplier: a step-by-step guide
Switching business energy supplier is an administrative process, not a physical one. Nobody visits your premises, nothing is disconnected, and the electricity or gas you use on switch day is identical to the day before. What changes is the contract: who bills you, at what rates, and on what terms. Here is the process from start to finish, including the parts that usually go wrong.
Step 1: Find out where you stand today
Before anyone can quote you accurately, you need four things:
- Your contract end date and notice window — from your contract or renewal letter, or by asking your current supplier.
- Your meter identifiers — the MPAN (electricity, the long number on your bill often shown in a grid labelled "S") and/or MPRN (gas). These identify your supply point uniquely; postcode alone is not enough for a firm quote.
- Your consumption — annual kWh from recent bills, or a set of recent bills a broker can read it from.
- Your business details — legal name, registration number if incorporated, and time at premises, because suppliers credit-check business customers.
Step 2: Serve notice if your contract requires it
Many fixed-term contracts renew automatically unless you tell the supplier you are leaving within a defined window. Serve notice in writing, keep a copy, and get an acknowledgement. Serving notice does not commit you to leaving — it simply keeps your options open. If you later decide to renew with the same supplier, notice is easily withdrawn; a missed notice window is much harder to unwind.
Step 3: Compare the market properly
Business energy is quoted individually — there is no public price list to check against. Quotes depend on your consumption, meter profile, location, credit standing, contract length and how energy markets are trading that week. This is where a broker adds real value: gathering like-for-like quotes across suppliers for your actual usage. When comparing, look beyond the unit rate:
- Standing charge — the daily fixed cost, which can outweigh unit-rate differences for low-consumption sites.
- Contract length — longer terms trade flexibility for certainty; neither is automatically better.
- Payment terms — direct debit is often required for the best terms.
- What is fixed — some "fixed" contracts allow certain third-party costs to be passed through; ask the question.
Step 4: Sign, then let the process run
Once you accept a quote, the new supplier registers your meter for a start date — normally the day after your current contract ends. Two things to know at this stage:
- There is usually no cooling-off period for businesses. Unlike domestic contracts, business energy contracts generally bind on signature. Be sure before you sign.
- Your old supplier can object to the transfer — most commonly for unpaid balances or because you are still inside a fixed term. Clear any arrears before switch day and the objection risk largely disappears.
Step 5: Switch day and the final bill
On the changeover date, take a meter reading and keep a photo. The old supplier uses it to close your account; the new one uses it to open yours. Check the final bill against the reading — closing bills are where estimated reads cause disputes. That is the whole event: no engineer, no downtime, no interruption to your kitchen, tills, or machines.
Moving premises? The rules change
A change of tenancy is the one situation where you can usually leave a supplier without waiting for a contract end date — the contract belongs to the business at the premises, not the bricks. If you are moving in, you inherit the incumbent supplier on deemed rates until you agree terms, so act in the first week, not the first quarter. If you are moving out, tell your supplier the move date, provide a final meter reading and a forwarding address, and pass the incoming occupier's details on where you can. Leaving this loose is how businesses end up chased for bills on premises they left months earlier.
The traps that catch busy businesses
- Doing nothing. The default outcome — rollover or out-of-contract rates — is nearly always the worst one. See our guide on how contracts end.
- Comparing headline unit rates only and ignoring standing charges or pass-through clauses.
- Leaving it until the final week. Credit checks and registrations take time; start when your renewal window opens, not the week the contract dies.
- Verbal agreements on the phone. Recorded verbal contracts can be binding in business energy. Never agree terms on a cold call; ask for everything in writing.
What it costs to use a broker
Nothing, directly: brokers like us are paid a commission by the winning supplier, typically built into the contract terms, and we disclose that arrangement plainly on every site we run. Your job is a one-minute form and one phone call; ours is the market comparison, the notice letters and the switch admin. If your renewal is coming up — or you have never checked — the quote form on our homepage is where it starts.
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