How to Switch Business Energy UK 2026: 6-Step Guide

By Andy Pickett · Managing Director

Published 17 April 2026 · About the author

Switching your business energy supplier is the single highest-impact way to cut your energy bill — UK businesses save an average of 20-35% by switching from a deemed or rollover contract to a competitive tariff. Yet only 1 in 4 UK businesses switch each year. This guide walks you through the 6-step process from start to finish.

When can you switch business energy?

You can switch:

• Within the renewal window (usually the 6 months before your contract ends).
• If you are out-of-contract (deemed or rollover): immediately, with 28 days’ notice.
• If your supplier has materially breached the contract (rare).

You cannot switch:

• Mid-contract (without paying termination fees, often 50-100% of the remaining contract value).
• If you have unpaid bills with your current supplier (an "objection").

The 6-step business energy switch

Step 1: Check your renewal date

Look at your most recent bill or contract. Note the contract end date and the notice period (typically 30-90 days). The earliest you can lock in a new contract is usually 12 months before the end date.

Step 2: Gather your usage data

You need:

• MPAN (electricity) or MPRN (gas) numbers — on your bill.
• Last 12 months of consumption (kWh) — on your bills or in your supplier portal.
• Current contract end date.
• Address and business name as registered.

Step 3: Get quotes

Three options:

• DIY: Contact 3-5 suppliers directly. Best for very small businesses (under £5k/year energy spend).
• Broker: Sign a Letter of Authority (LOA) and let a broker tender 8-15 suppliers. Best for SMEs (£5k-£500k/year).
• In-house procurement: Tender direct via formal RFP. Best for large businesses (over £500k/year).

Step 4: Compare on total cost

Quotes show unit rate (p/kWh) and standing charge (p/day). Calculate annual cost: (kWh × unit rate) + (365 × standing charge). Compare net of VAT and CCL. Consider:

• Contract length (12, 24, 36 months).
• Green / REGO-backed status.
• Billing frequency and method.
• Direct debit discount (if any).
• Termination terms.

Step 5: Sign the contract

Once you accept a quote, you sign a contract (usually digital). The new supplier then submits a switch request via the central settlement system.

Step 6: The switch happens

4-6 weeks after signing, your supply transfers to the new supplier. There is no service interruption and no engineer visit unless your meter needs upgrading. You will get a final bill from the old supplier and a welcome letter from the new one. Direct debits transfer automatically.

Common reasons a business energy switch fails

• Outstanding balance: Pay any disputed amount or set up a payment plan first.
• Contract still in force: You signed a renewal you did not realise was binding. Check the small print.
• Wrong MPAN or MPRN: Double-check the numbers on your bill.
• Unsigned LOA: Make sure your broker has the signed LOA before submitting quotes.

What does it cost to switch business energy?

Nothing — the switch itself is free. Brokers are paid by the supplier as a commission baked into your unit rate (typically 0.5-2p/kWh). Reputable brokers disclose this commission upfront. There are no engineer fees, exit fees from your old supplier (provided you switch in your renewal window), or admin charges.

Frequently Asked Questions

Ready to switch? Get a free 60-second business energy quote — we will tender 8-15 suppliers and handle the LOA, contract and switch admin for you.