How to Switch Business Energy Supplier in the UK: Step-by-Step Guide

Why switching business energy is different from switching at home

Switching business energy is not the same exercise as moving your household tariff. Domestic customers can leave most deals with little friction, but business energy contracts are commercial agreements with fixed terms, defined notice windows, and far less room to walk away early. Miss the rules and you can find yourself locked in for another year, or paying punishing deemed and out-of-contract rates that sit well above any negotiated tariff.

The good news is that the process is predictable once you understand the moving parts. Business energy is regulated by Ofgem, and micro-businesses in particular benefit from additional protections around contract transparency, notice periods, and complaint resolution. This guide walks through the seven steps in order, explains exactly what information you need to hand, and sets out where the Energy Ombudsman and your cooling-off rights fit in.

The 7 steps to switch business energy supplier

Step 1: Find your contract end date and notice period

Everything starts with timing. Locate your current contract paperwork or welcome letter and identify two dates: the contract end date and the start of your notice window. Many business energy contracts require you to serve notice within a defined period before the contract expires. If you serve notice too early or too late, the supplier can refuse it and roll you over. Treat this date as the single most important fact in the whole exercise.

Step 2: Gather your supply numbers and consumption data

To get accurate quotes a new supplier needs your meter point identifiers. For electricity this is your MPAN, a 21-digit number, and for gas it is your MPRN, typically 6 to 10 digits. You will also want your annual consumption in kilowatt hours (kWh), your current unit rate and standing charge, and the name of your existing supplier. Having a recent bill in front of you covers almost all of this.

Step 3: Compare quotes from multiple suppliers or a broker

With your numbers ready, request quotes. You can approach suppliers directly or use a Third Party Intermediary (broker). If you use a broker, ask how they are paid: many add a commission to your unit rate, which Ofgem now requires to be disclosed more clearly to micro-businesses. Compare the unit rate, standing charge, contract length, and any exit terms, not just the headline price.

Step 4: Choose a contract type and length

Decide between a fixed-term contract, which locks your unit rate for the term, and a flexible or variable arrangement. Most small businesses choose a fixed deal for budget certainty. Contract lengths commonly run from 12 to 60 months. A longer term gives price stability but reduces your ability to react if wholesale prices fall.

Step 5: Serve notice to your current supplier

If your contract terms require it, serve written notice to your existing supplier within the permitted window. Keep a dated copy. For micro-business contracts, suppliers must make notice requirements clear, and many will no longer enforce a separate termination notice for micro-businesses, instead allowing a switch at the contract end date. Check your specific terms rather than assuming.

Step 6: Sign the new contract and let the suppliers handle the transfer

Once you sign with the new supplier, they coordinate the switch with the old one through the industry data systems. You do not need to contact your existing supplier separately to arrange the physical change: the supply itself does not move, only the billing relationship. Provide a meter reading on the agreed switch date to ensure your opening and closing bills are accurate.

Step 7: Confirm the switch and check your first bill

After the switch completes, confirm the start date in writing and check your first bill matches the agreed unit rate and standing charge. Settle any final bill from the old supplier promptly, because an unpaid balance can give a supplier grounds to object to future switches. File your new contract paperwork and diarise the next notice window straight away.

Switching timeline: what happens and when

The table below sets out the typical sequence. Exact timings vary by supplier and meter type, but this reflects the standard pattern for a non-half-hourly business supply as of 2026.

The key point in the table is the gap between step 6 and step 7. The administrative switch can complete in days, but the new contract only goes live when your existing one ends. If you sign three months before expiry, you wait three months for the new rate to apply.

What information you need before you start

Pulling the right details together upfront prevents inaccurate quotes and last-minute delays. Have these ready:

• MPAN: the 21-digit electricity supply number on your bill, sometimes shown as the Supply Number with a structured top and bottom line.
• MPRN: the gas supply number, usually 6 to 10 digits.
• Current contract end date and notice period: the dates that govern when you can switch.
• Annual consumption: your usage in kWh, ideally from a full year of bills.
• Current rates: your unit rate and standing charge for comparison.
• Existing supplier name and account number.

If you cannot find your MPAN, your electricity distribution network operator can provide it. For an unknown MPRN, the Meter Number Helpline operated for the gas network can trace it from your address.

Notice periods and the objection process

Notice periods exist so suppliers can manage their wholesale buying. Historically business customers had to write to cancel within a narrow window or face automatic rollover. Ofgem rules have tightened this for micro-businesses, restricting how rollover and notice can be applied, but mid-sized and larger businesses should still check their contract terms carefully.

An objection is when your current supplier blocks the switch. Suppliers can only object for permitted reasons. The most common are an outstanding debt on the account or that you are attempting to leave inside your fixed term without a valid exit route. If you are objected to, the supplier must tell you why. Clearing a debt or waiting until the contract end date usually resolves it. You cannot be objected to simply because the supplier wants to keep your business.

What the Energy Ombudsman covers

If something goes wrong with a switch and you cannot resolve it directly, the Energy Ombudsman provides free, independent dispute resolution. Micro-businesses can use the scheme. You can escalate a complaint once it has been unresolved for 8 weeks, or sooner if the supplier issues a deadlock letter confirming it will take no further action.

The Ombudsman can look at issues such as billing errors, problems with the switch process, delays, and how a complaint was handled. Its decisions are binding on the supplier if you accept them, and it can require an apology, corrective action, or financial compensation. It cannot set energy prices or overturn a commercial contract you freely entered into.

Micro-business cooling-off rights

A micro-business meets at least one of the Ofgem thresholds, broadly fewer than 10 employees with low turnover or balance sheet, or annual consumption below set electricity or gas limits. Micro-businesses enjoy stronger protections than larger firms, including clearer pre-contract information and tighter rules on broker disclosure.

Cooling-off rights depend on how the contract was agreed. Where consumer contract regulations apply, contracts agreed off-premises or at a distance may carry a 14-day cancellation period. Verbal contracts agreed by phone are binding in business energy, so do not assume you can change your mind freely after a phone sale. Always confirm in writing what cancellation rights, if any, your specific contract carries before you commit.

Frequently Asked Questions

How long does it take to switch business energy?

The administrative switch typically completes in around 5 working days under faster switching arrangements. However, the new contract and its rates only start when your existing contract ends. If you arrange the switch months ahead of your end date, the new supply goes live on that future date rather than within days.

What is an MPAN?

An MPAN, or Meter Point Administration Number, is the unique 21-digit reference for your electricity supply point. It is printed on your electricity bill, sometimes labelled as the Supply Number, and identifies your premises to suppliers and the network. A new supplier needs it to set up your switch.

What is an MPRN?

An MPRN, or Meter Point Reference Number, is the unique identifier for your gas supply point, typically 6 to 10 digits. It is the gas equivalent of the electricity MPAN and appears on your gas bill. If you cannot find it, the gas network meter number helpline can trace it from your address.

Can my supplier object to my switch?

Yes, but only for permitted reasons. The most common grounds are an outstanding debt on your account or an attempt to leave a fixed contract early without a valid exit route. The supplier must tell you why it has objected. Clearing the debt or waiting until your contract end date usually clears the objection.

What are my cooling-off rights as a micro-business?

It depends on how you agreed the contract. Deals agreed off-premises or at a distance may carry a 14-day cancellation period under consumer contract regulations. Verbal contracts agreed by phone in business energy are generally binding, so confirm your specific cancellation rights in writing before committing.