Why SMEs Overpay for Energy: The Five Most Common Mistakes

Most UK SMEs Overpay for Energy. The Causes Are Not Complex — They Are Five Behaviours That Repeat Across Every Sector.

In over two decades of reviewing business energy contracts, we have seen thousands of cases where UK SMEs were paying materially more than they needed to. The overpayment is rarely the result of deliberate exploitation by suppliers (though uncompetitive renewal offers are a genuine problem). It is almost always the result of one or more of five specific behaviours that compound over time and are entirely within the business owner’s ability to change.

Here are the five most common mistakes, with precise illustrations of what each one costs.

Mistake 1: Allowing Auto-Renewal Without Market Comparison

Auto-renewal is the most prevalent and most expensive single mistake in business energy management. The mechanism is simple: your contract has a notification deadline — a date by which you must act to avoid the contract rolling over automatically. Most businesses miss it. The contract rolls. The renewal rate is set by the supplier at a level that assumes you’re not shopping.

What it costs: Auto-renewed contracts typically run 15–25% above the competitive market rate for equivalent consumption. For a business spending £45,000 per year on energy, 20% overpayment is £9,000 per year. Over a two-year rollover (a common auto-renewal term): £18,000 lost on a completely avoidable basis.

The fix: Set a diary reminder six months before your contract expiry date. Engage a broker at that point. The market comparison takes 48–72 hours. The saving is immediate.

Mistake 2: Comparing Only the Unit Rate, Not the Full Cost Stack

Wholesale energy is 35–45% of a typical business electricity bill. The remaining 55–65% is network charges, environmental levies, Climate Change Levy, and supplier margin. Businesses that focus exclusively on the unit rate comparison — who has the cheapest headline number — are optimising less than half the bill while ignoring the majority.

The non-commodity charges are not freely variable — they’re set by regulation and market mechanism. But they appear differently depending on contract structure (all-inclusive vs pass-through), they are not immune to error (CCL at wrong rate, VAT at wrong percentage), and they are influenced by how the contract is structured relative to your consumption profile.

What it costs: A business on a pass-through contract whose non-commodity charges increased by 1.5p/kWh during the contract term, consuming 300,000 kWh per year, absorbs an unbudgeted £4,500 per year that wouldn’t have appeared on an all-inclusive deal.

The fix: Ask your broker to break out the non-commodity charge component of any contract quote. Understand whether you’re on all-inclusive or pass-through terms. If you’ve never had your bill broken down by component, do it now.

Mistake 3: Using a Broker Without Verifying Their Independence

Approximately 3,000 Third Party Intermediaries operate in the UK non-domestic energy market. Not all of them provide genuinely independent advice. Some have preferred supplier arrangements that bias their recommendations toward higher-paying suppliers. Some run restricted panels that exclude competitive suppliers. Some recommend contract lengths that maximise their commission rather than the client’s value.

The business owner who uses a broker without verifying their independence may be paying more than if they’d gone directly to a supplier — because the broker’s commission inflates the unit rate while the restricted panel means the best-priced supplier never appeared in the comparison.

What it costs: The difference between a broker charging 0.2p/kWh commission and one charging 0.8p/kWh is £1,800 per year on a 300,000 kWh account. If the restricted panel also means the cheapest supplier wasn’t approached, add a further potential 5–15% to the overpayment.

The fix: Ask your broker directly how much commission they receive on the contract they’re recommending. Ask how many suppliers they tendered. Ask if they have preferred supplier arrangements. A genuinely independent broker answers all three questions without hesitation.

Mistake 4: Failing to Claim Available Tax Reliefs and Exemptions

Two specific tax reliefs are chronically under-claimed by UK businesses on their energy bills:

Climate Change Levy (CCL) reductions: Businesses with a Climate Change Agreement through their trade association receive an 80% reduction in CCL. Charities and some specific use categories qualify for full exemption. Many eligible businesses are paying full CCL because their energy adviser hasn’t raised it or the CCA application was never completed. The 80% CCL reduction on 500,000 kWh of electricity saves approximately £3,100 per year — for what is essentially a qualification exercise.

VAT at 5% (not 20%): Residential care homes, some GP practices, charities, and businesses meeting small consumption thresholds should be paying 5% VAT on energy rather than the standard 20%. Many are not. The overpaid VAT is recoverable for up to four years. A care home spending £60,000 per year on energy at 20% VAT when 5% applies has overpaid £9,000 per year — £36,000 recoverable over four years.

What it costs: Combined, CCL and VAT errors routinely cost eligible businesses £3,000–£12,000 per year that is directly recoverable.

The fix: Check your current VAT rate and CCL rate on your most recent bill. If you’re in a sector that might qualify for reduced rates, verify your eligibility. A competent energy adviser should have raised this at your last contract renewal.

Mistake 5: Leaving Contracts Too Long Before Reviewing

The final mistake is the most structural: treating energy procurement as a once-every-few-years task rather than a once-a-year one. Businesses that review their energy contracts annually — going to the competitive market each time — consistently pay less than those who review every two or three years.

The annual review disciplines three things simultaneously: it ensures the business never auto-renews accidentally, it means the market is always assessed against current conditions rather than conditions at the last renewal, and it maintains the habit and infrastructure (knowing the contract dates, having the broker relationship, having the consumption data available) that makes the process fast and low-friction.

The business that last reviewed its energy contract in 2022 has been living with 2022’s market conditions baked into its costs, or has silently auto-renewed one or more times, or is comparing a 2022 contract to the market four years later for the first time. All three scenarios are likely more expensive than an annual review cycle would have produced.

What it costs: The cumulative overpayment from a four-year gap between reviews, on a business spending £60,000 per year on energy, can be £15,000–£30,000 relative to what annual competitive tendering would have delivered — depending on how the market moved in the period.

The fix: Make energy contract review an annual calendar item. Or work with a broker who tracks your renewal dates and initiates the review process on your behalf — removing the requirement for you to initiate anything.

The Common Thread

All five mistakes share a root cause: energy is being managed reactively rather than proactively. The businesses that avoid them are not more sophisticated — they just have a system, whether their own or their broker’s, that treats energy procurement as a managed process rather than a background event.

The cost of implementing that system is minimal. The cost of not implementing it, compounded over years, is material.

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