Business Energy Switching Guide 2026

1. Why switching business energy matters in 2026

Business energy costs in the UK remain one of the largest controllable overheads for most companies. Unlike domestic customers who benefit from the Ofgem price cap, business energy is an open market — prices vary significantly between suppliers, contract types, and even the time of year you negotiate.

The wholesale energy market has stabilised considerably since the extreme volatility of 2022–2023, but that doesn't mean prices have returned to pre-crisis levels. In 2026, typical business electricity rates sit between 22–30p per kWh depending on usage profile and contract terms, while gas is roughly 6–9p per kWh. That spread is precisely why comparing matters: the difference between the cheapest and most expensive offers for the same premises can easily reach 30–40%.

For a medium-sized business consuming 50,000 kWh of electricity per year, even a 3p/kWh saving translates to £1,500 per year. Scale that up across gas and electricity, and the typical business switching through a comparison service saves between £1,800 and £4,500 annually.

Loyalty does not pay in business energy. Suppliers rely on inertia — businesses that let contracts roll over onto expensive out-of-contract rates, or that renew without comparing alternatives. The entire market is structured to reward those who shop around.

2. When to switch — timing is everything

The 6-month window

Most business energy suppliers allow you to negotiate and lock in a new contract up to 6 months before your current deal expires. This is the sweet spot. Start comparing at least 4–6 months ahead of your contract end date to give yourself time to evaluate offers without pressure.

Notice periods

Business energy contracts typically require you to give written notice of termination. The notice window varies by supplier but is usually 30–90 days before the contract end date. Miss this window and your contract may auto-renew (usually onto less favourable terms) or roll onto deemed/out-of-contract rates.

Where to find your contract end date

• Check a recent energy bill — it should state the contract end date
• Log into your supplier's online portal
• Call your current supplier and ask directly
• Check any renewal letter or email correspondence from your supplier

Best time of year to compare

Business energy prices fluctuate with wholesale markets, but demand for new contracts is typically lower in spring and summer (April–August). Some businesses find marginally better rates during these quieter periods, though the difference is less significant than simply comparing multiple suppliers at any time.

3. What you need before comparing

Having the right information to hand makes the comparison process faster and ensures the quotes you receive are accurate. Here's what you'll need:

MPAN and MPRN numbers

Your MPAN (Meter Point Administration Number) is a 13-digit reference for your electricity supply. Your MPRN (Meter Point Reference Number) is a similar reference for gas. These uniquely identify your premises and are essential for getting accurate quotes.

You'll find both on your energy bills, usually on the first or second page. The MPAN is sometimes labelled "Supply Number" or "S Number" on electricity bills.

Annual usage figures

Your annual consumption in kWh is the most important factor in determining your rates. You can find this on your bills (look for "estimated annual consumption" or "EAC") or ask your current supplier. If you have a smart meter or half-hourly meter, your supplier can provide detailed consumption data.

Current tariff details

Knowing your current unit rate (p/kWh) and standing charge (p/day) lets you immediately see whether a new offer is genuinely cheaper. Have a recent bill to hand for comparison.

Other useful details

• Meter type — standard, smart, or half-hourly (profile class 05–08 meters have different procurement)
• Contract end date — as discussed above
• Business name and address — as registered with your current supplier
• Number of meter points — if you have multiple premises

4. Understanding your business energy bill

Business energy bills can be confusing. Understanding the main components helps you compare offers accurately and spot whether you're getting a fair deal.

Unit rate

This is the price you pay per kilowatt-hour (kWh) of energy consumed. It's the biggest driver of your total cost. Business electricity unit rates in 2026 typically range from 22–30p/kWh; gas rates from 6–9p/kWh. Rates vary by region, usage volume, and contract terms.

Standing charge

A fixed daily charge for maintaining your connection to the energy network. You pay this whether you use any energy or not. Typical electricity standing charges are 25–60p per day; gas standing charges are 15–45p per day. Some suppliers offer lower standing charges with higher unit rates (or vice versa), so always compare the total annual cost, not just the unit rate.

Climate Change Levy (CCL)

The CCL is a government-mandated environmental tax charged on business energy. In 2026, the rates are approximately 0.78p/kWh for electricity and 0.67p/kWh for gas. This is shown as a separate line on your bill and applies to most commercial energy users, though some sectors (e.g., very energy-intensive industries with Climate Change Agreements) may receive a discount.

VAT

Most businesses pay 20% VAT on energy. However, if your business uses a small amount of energy (under 1,000 kWh of electricity per month or 4,397 kWh of gas per month), or if at least 60% of your energy is used for domestic/charitable purposes, you may qualify for the reduced 5% VAT rate. Your supplier should ask you to complete a VAT declaration form.

5. Fixed vs variable tariffs

Choosing between fixed and variable tariffs is one of the most important decisions when switching business energy. Here's how they differ:

Fixed-rate tariffs

Your unit rate and standing charge are locked in for the duration of the contract, typically 1–5 years. This means your costs are predictable regardless of what happens in the wholesale market.

Pros:

• Budget certainty — you know exactly what you'll pay per kWh
• Protection against price rises during the contract period
• Easier financial planning and forecasting
• Most business energy contracts are fixed, so there's a wide choice

Cons:

• If wholesale prices fall significantly, you won't benefit until renewal
• Early termination fees can be substantial (often calculated per kWh of remaining estimated usage)
• Longer contracts lock you in — a lot can change in 3–5 years

Variable / flexible tariffs

Your rates move with the wholesale market, sometimes monthly, sometimes quarterly. Some "pass-through" or "flexible" contracts split the cost into wholesale energy, network charges, and supplier margin separately.

Pros:

• You benefit immediately when wholesale prices drop
• No early termination fees (usually just a notice period)
• Potentially cheaper over time if market conditions are favourable

Cons:

• No price certainty — bills can spike in volatile periods
• Harder to budget and forecast costs
• Requires more active management and market awareness

Which should you choose?

For most small and medium businesses, a 1–2 year fixed contract offers the best balance of price certainty and flexibility. It protects you from sudden price spikes without locking you in for too long. Larger businesses with dedicated energy buyers may benefit from flexible procurement strategies, but these require time and expertise to manage.

6. Out-of-contract rates and why they cost you

When your fixed-term contract ends and you haven't arranged a new one, you are placed on "out-of-contract" or "deemed" rates. This is where many businesses lose significant money without realising it.

What are deemed rates?

Deemed rates are the supplier's default tariff for customers without a negotiated contract. They are not competitive. According to Ofgem data, deemed rates are typically 20–50% higher than equivalent contracted rates. In some cases, the difference can be even greater.

Suppliers are not required to offer their best rates to out-of-contract customers. In fact, deemed rates act as a strong financial incentive for suppliers — they profit from customer inertia. It's entirely legal, and it's how the market works.

How much more could you be paying?

Consider a business using 40,000 kWh of electricity per year. On a negotiated fixed contract at 25p/kWh, the annual electricity cost is £10,000. On deemed rates at 35p/kWh (a 40% premium), that jumps to £14,000 — an unnecessary £4,000 per year.

Many businesses don't notice the increase immediately because they pay by direct debit and don't scrutinise their bills. The extra cost quietly accumulates month after month.

Rolling contracts vs deemed rates

Some suppliers place you on a "rolling contract" rather than true deemed rates when your fixed deal ends. Rolling contracts are slightly cheaper than deemed rates but still significantly more expensive than a negotiated fixed deal. The key difference: rolling contracts usually require 30 days' notice to leave, while deemed rates allow you to switch immediately.

7. The switching process step by step

Switching business energy is straightforward once you know the process. Here's exactly what happens:

1. Gather your details. Collect your MPAN/MPRN, annual usage figures, current tariff, and contract end date. This takes 5–10 minutes if you have a recent bill to hand.
2. Compare quotes. Use a comparison service to see offers from multiple suppliers side by side. Enter your details once and receive quotes instantly. Focus on the total annual cost, not just the unit rate.
3. Choose your new supplier and tariff. Review the contract terms carefully — check the contract length, payment method, early termination fees, and whether rates include CCL.
4. Sign the new contract. This is usually done electronically. You'll receive a confirmation letter or email from your new supplier with the agreed rates and contract start date.
5. Your new supplier handles the switch. They contact your old supplier and manage the transfer. You don't need to contact your old supplier to cancel (though it's good practice to confirm they're aware).
6. The switch completes. This typically takes 2–6 weeks from signing. Your supply is never interrupted during the switch — the same gas and electricity flows through the same pipes and wires. Only the billing changes.
7. Receive a final bill from your old supplier. This covers usage up to the switch date. Ensure your final meter reading is accurate to avoid estimated bills.

Common concerns

Will my supply be interrupted? No. Switching supplier is a billing change, not a physical change. The same energy comes through the same infrastructure.

Can I switch if I'm still in contract? You can arrange a new contract to start when your current one ends. If you want to leave early, you may face termination fees — these are usually calculated based on remaining usage and can be substantial. In some cases, the savings from switching still outweigh the exit fee, so it's worth checking.

What about smart meters? If you have a SMETS2 smart meter, it will continue to work with your new supplier. Older SMETS1 meters may temporarily lose smart functionality and revert to "dumb" mode after a switch, though the government's Data Communications Company (DCC) programme is progressively resolving this.

8. Tips for reducing business energy costs beyond switching

Switching to a cheaper tariff is the single biggest step, but there are practical ways to reduce your consumption and lower bills further:

Quick wins

• LED lighting: If you haven't already, replace all lighting with LEDs. The payback period is typically 6–18 months, and they use up to 80% less energy than older bulbs.
• Heating controls: Install programmable thermostats and timers. Reducing your thermostat by just 1°C can cut heating bills by up to 8%.
• Draught-proofing: Seal gaps around doors, windows, and loading bays. This is low cost and immediately effective.
• Equipment scheduling: Ensure heating, cooling, and lighting systems switch off outside business hours. Many businesses leave systems running overnight and on weekends unnecessarily.

Medium-term improvements

• Energy audit: Commission a professional energy audit to identify your biggest areas of waste. Many energy suppliers and local authorities offer subsidised audits for SMEs.
• Smart meters and monitoring: Half-hourly data lets you see exactly when and where energy is being used, revealing patterns you wouldn't spot from quarterly bills.
• Insulation: Roof and cavity wall insulation for commercial premises can reduce heating costs by 20–30%. Check whether your business qualifies for any government grants.
• Efficient HVAC: If your heating or cooling systems are more than 15 years old, modern replacements can be 30–50% more efficient.

Longer-term investments

• Solar panels: Commercial rooftop solar is increasingly cost-effective, with typical payback periods of 5–8 years. Excess generation can be exported to the grid under the Smart Export Guarantee (SEG).
• Battery storage: Pairing solar with battery storage lets you use generated energy during peak-rate periods, maximising savings.
• Voltage optimisation: For businesses with high electrical loads, voltage optimisation equipment can reduce consumption by 8–15% by regulating incoming voltage to the optimal level.
• Heat pumps: Air-source and ground-source heat pumps can replace gas heating with much higher efficiency. The Boiler Upgrade Scheme may provide grants towards installation costs.