A business energy contract is a binding agreement between your company and an energy supplier that sets out pricing, supply duration, and billing terms. Unlike domestic tariffs, these contracts allow negotiated rates based on consumption, but they also come with fewer protections and no cooling-off period once you sign.

This guide covers the contract types available to UK businesses, what to check before signing, how switching works, and why the traditional supply model is starting to crack.

What is a business energy contract

A business energy contract is a binding agreement between a company and an energy supplier. It sets out the price per unit of electricity or gas, how long the supply lasts (typically one to five years), and how billing works. Unlike domestic tariffs, business contracts allow for negotiated pricing based on how much power you use. And here's the catch: most business contracts don't include the cooling-off periods that protect household customers.

The contract covers more than just the unit rate. It spells out whether your rates stay fixed or move with the market, what happens if you want to leave early, and how charges appear on your bill. Getting this right matters. The gap between a well-structured contract and a poor one can run into thousands of pounds each year.

Business vs domestic energy contracts

Business energy plays by different rules. Domestic customers benefit from Ofgem's price cap and standardised protections. Commercial customers negotiate their own terms, often with fewer safeguards.

The lack of a cooling-off period catches many businesses off guard. Once you sign, you're locked in. That makes checking the details before signing far more important than it is for a home energy switch.

Types of business energy contracts

The UK market offers several contract structures. Each one suits different risk appetites and operational realities.

Fixed price contracts

A fixed price contract locks in your unit rate for the entire term. You pay the same price per kilowatt-hour whether wholesale markets rise or fall. Businesses that prioritise budget certainty often prefer this approach.

The trade-off? If wholesale prices drop, you're still paying the higher locked-in rate. For many businesses, that predictability is worth it.

Flexible contracts

Flexible contracts track wholesale market movements. Your rate adjusts based on when and how you buy power throughout the contract term. Larger businesses with dedicated energy managers sometimes prefer this approach because it creates opportunities to buy when prices dip.

Flexibility cuts both ways, though. Without the expertise to monitor markets and time purchases well, you can end up paying more than a simple fixed deal would have cost.

Deemed and out-of-contract rates

When a business moves into new premises or lets a contract expire without renewal, it lands on deemed rates. Deemed rates are the supplier's default prices, and they sit well above negotiated rates.

Avoiding deemed rates, which can be 2–3x more expensive than negotiated rates, is one of the simplest ways to cut energy costs. Track your contract end dates. Set reminders. Never let a contract lapse without a plan in place.

Blend and extend contracts

A blend and extend deal lets you renew early while combining your new rate with the remaining term of your existing contract. If market conditions look favourable and you want to lock in before prices rise, this approach can work well.

The maths gets complicated. Make sure you understand exactly how the blended rate is calculated before committing.

Short-term vs long-term power contracts

Contract length is a strategic decision, not just an administrative one. The right choice depends on your market outlook, risk tolerance, and how much flexibility your business requires.

Advantages of short-term contracts

• Flexibility: Exit sooner if your business circumstances change or better deals emerge

• Lower commitment: Test a supplier's service before locking in for years

• Market timing: Renew when conditions favour buyers

Risks of short-term contracts

• Rate volatility: More frequent renewals expose you to market swings

• Administrative burden: Procurement cycles happen more often

• Less leverage: Smaller volume commitments can mean a weaker negotiating position

Advantages of long-term contracts

• Price stability: Lock in rates across multiple years

• Reduced admin: Fewer renewals to manage

• Stronger terms: Larger volume commitments can unlock better rates

Downsides of long-term contracts

• Trapped in unfavourable rates: If wholesale prices fall, you lose out

• Early exit fees: Breaking the contract triggers penalties

• Reduced agility: Business circumstances change; long contracts don't

How to spot a good commercial energy contract

Not all contracts are created equal. Before signing, look closely at a few key elements.

Pricing structure and transparency

Some suppliers quote all-inclusive rates that bundle everything into one number. Others use pass-through pricing, where non-commodity charges appear separately on your bill. Neither approach is inherently better, but you want to understand which you're getting.

The real question: can you see exactly what you're paying for? Opaque pricing hides margin. Some newer suppliers now offer real-time visibility into costs, showing businesses precisely where their money goes. That transparency changes the relationship entirely.

Contract length and exit clauses

Check the termination notice period. Some contracts require 90 days' notice before the end date. Miss that window, and you might roll onto unfavourable rates automatically.

Exit fees vary widely. Understand the calculation method before you sign. A contract that looks cheap upfront can become expensive if circumstances force an early exit.

Renewal terms and auto-rollover provisions

Many business contracts include auto-rollover clauses. If you don't actively terminate or renew by a specific date, the contract extends automatically, often at higher rates.

Set calendar reminders at least six months before your contract ends. That gives you time to compare alternatives and negotiate properly.

Metering and billing accuracy

Larger business sites typically use half-hourly meters that record consumption every 30 minutes. Half-hourly metering enables accurate billing based on actual usage rather than estimates.

If your bills are based on estimates, you're probably overpaying in some periods and underpaying in others. Accurate metering eliminates that guesswork and gives you data to optimise consumption patterns.

Pass-through charges and hidden costs

The unit rate is only part of your bill. Non-commodity charges can add 40-60% on top, and they often surprise businesses who only compared headline prices.

• Climate Change Levy (CCL): A government environmental tax on business energy use

• Distribution Use of System (DUoS): Charges from regional network operators for using local infrastructure

• Transmission Network Use of System (TNUoS): National grid charges for high-voltage transmission, expected to nearly double by April 2026

• Capacity Market charges: Costs to ensure grid reliability during peak demand

When comparing contracts, ask suppliers to break down total costs including all pass-through charges. A lower unit rate with higher pass-throughs can cost more overall.

How to switch business energy suppliers

Switching suppliers does not interrupt your power supply. The electricity flows through the same wires regardless of who bills you for it.

1. Review your current contract

Gather your contract end date, notice period requirements, and any exit fees. Pull together recent bills and meter details. You'll want your MPAN (electricity) or MPRN (gas) numbers handy.

2. Compare suppliers and rates

You can approach suppliers directly, work with a broker, or use comparison services. When comparing, ensure you're looking at like-for-like quotes. An all-inclusive rate and a pass-through rate aren't directly comparable without doing the maths.

3. Sign and confirm the switch

The switch typically takes two to four weeks. Micro-businesses (fewer than ten employees with low turnover) qualify for a 14-day cooling-off period. Larger businesses generally don't have this protection.

4. Monitor your first bills

Check your first invoice against the agreed rate. Errors happen. Catching discrepancies early saves time and money.

How energy brokers affect your power contract

Brokers can save you time by gathering quotes and handling paperwork. They can also add cost that you never see itemised.

What is a Letter of Authority

A Letter of Authority (LOA) gives a broker permission to access your supply details and obtain quotes on your behalf. It does not commit you to anything. Think of it as letting someone shop around for you.

What is a Letter of Exclusivity

A Letter of Exclusivity (LOE) is different. It commits you to working with one broker exclusively for a set period. This limits your options and can prevent you from getting quotes elsewhere.

How intermediaries add cost

Broker commissions typically embed in the unit rate you pay. You rarely see this margin disclosed separately. Over a multi-year contract with significant consumption, that adds up.

Some businesses now bypass traditional broker models entirely, using technology platforms that connect them directly with generators and remove intermediary layers.

Power purchase agreements for UK businesses

A Power Purchase Agreement (PPA) is a direct contract between a business and a renewable generator. Instead of buying power through a supplier who bought it on the wholesale market, you contract directly with a wind farm, solar installation, or other generator.

PPAs typically suit larger energy users who can commit to significant volumes over extended periods. They offer price certainty plus genuine sustainability credentials. The power comes from a specific, identifiable source.

Corporate PPAs are growing in the UK — with UK volumes doubling to 1.4 GW in 2024 — though they traditionally required substantial consumption to make the economics work. Newer models are opening this approach to smaller businesses by aggregating demand.

How technology is changing business energy contracts

The traditional model works like this: generators sell to traders, traders sell to suppliers, suppliers sell to businesses. Each layer adds margin. Each handoff adds opacity.

Technology is collapsing those layers. AI-powered platforms now match businesses directly with generators, cutting out wholesale market intermediaries. Half-hourly settlement data enables billing based on actual consumption rather than estimates. Real-time dashboards show businesses exactly what they're paying and why.

This shift matters because it addresses the structural problem, not just the symptoms. It's not a better rate from the same system. It's a different system entirely.

How to manage multiple energy contracts

Multi-site businesses face additional complexity. Different sites might have different contract end dates, different suppliers, and different rate structures.

Consolidating contract end dates where possible simplifies procurement. You negotiate once for your entire portfolio rather than managing rolling renewals throughout the year. Track meter numbers, rates, and renewal windows in a centralised system.

Tip: Align contract end dates to fall outside winter months when wholesale prices typically peak. Renewing in summer often yields better rates.

Why UK businesses are moving beyond traditional energy contracts

The legacy energy supply model was built for a different era. It rewards intermediaries, obscures true costs, and treats opacity as a feature rather than a bug.

Businesses are catching on. They're asking why their bills include margins for traders they never chose to work with. They're questioning why pricing feels like a black box. They're looking for alternatives that connect them closer to the source of their power.

If your current contract feels like it was designed to confuse you, it probably was.

Let's talk.

FAQs about business energy contracts

Are business energy contracts worth it for small companies?

Yes. Even small businesses benefit from negotiated rates compared to deemed or out-of-contract pricing. Suppliers set deemed rates at a premium above contracted prices. A proper contract almost always costs less.

Can micro-businesses access commercial energy contracts?

Yes. Micro-businesses with fewer than ten employees and low turnover qualify for some consumer-style protections, including cooling-off periods. They can access commercial contracts through suppliers or brokers while retaining more safeguards than larger businesses.

What happens if a business breaks its energy contract early?

The supplier typically charges an early termination fee. This is often calculated based on remaining volume and the difference between your contracted rate and the current market rate. Check the specific calculation method in your contract before signing.

How often should a business review its energy contract?

Review at least six months before expiry. That gives you time to compare alternatives, negotiate properly, and avoid rolling onto unfavourable rates.

What is half-hourly settlement in business energy?

Half-hourly settlement means your supplier bills based on actual consumption recorded every 30 minutes rather than estimates. This gives businesses accurate invoices tied to real usage and data to identify when they're consuming most power.