How to Compare Business Gas Contracts (And What the Comparison Sites Don’t Show You)

Comparison Sites Show You the Unit Rate. Your Bill Is Made Up of Six Cost Components. Here’s How to Compare Business Gas Properly.

Comparing business gas contracts is more straightforward than comparing business electricity, because gas bills have fewer non-commodity charge components. But “more straightforward than electricity” is not the same as simple — and the ways that businesses miscompare business gas quotes consistently cost them money, either immediately through choosing an uncompetitive rate or over time through poorly structured contract terms.

This guide explains what you’re actually comparing when you get business gas quotes, what the comparison sites don’t show you, and the specific variables that determine whether the cheapest headline rate is genuinely the best deal for your business.

The Components of a Business Gas Bill

Unlike business electricity — where non-commodity charges represent 55–65% of the total bill — business gas is more commodity-dominated. A typical business gas bill breaks down as follows:

Wholesale gas cost (60–70% of total bill): The cost of the gas itself, priced against the NBP (National Balancing Point) forward curve and adjusted for the supplier’s hedging costs and margin. This is the element that moves with gas market conditions and that competitive procurement primarily addresses.

Transportation and distribution charges (15–20%): The cost of moving gas through the national transmission system and local distribution networks to your premises. These charges are set by the gas transporter (Cadent, NGN, SGN, or WWU) and National Grid Gas Transmission. They are not freely variable between suppliers — all suppliers pay the same transportation charges for a given meter point, so differences between supplier quotes on this element are typically not meaningful.

Metering and data charges (2–5%): The cost of operating and maintaining the meter at your premises and collecting the consumption data. These vary slightly by meter type and by the metering service provider associated with your supply.

Climate Change Levy (variable by consumption and eligibility): A government tax on business energy consumption. For gas, the current rate is 0.672p/kWh. Businesses with Climate Change Agreements receive an 80% reduction. Charities and certain qualifying uses may be exempt. If you’re eligible for a reduced or zero CCL rate and it’s not reflected in your quote comparison, the comparison is understating your cost saving opportunity.

VAT (20% standard, 5% for qualifying premises): Applied on top of the above. Residential care homes, some charities, and small-consumption users may qualify for the 5% reduced rate.

Supplier margin and standing charge: The supplier’s commercial return and the fixed daily standing charge for maintaining the supply connection.

What a Proper Business Gas Comparison Involves

A genuine business gas comparison — the kind that actually identifies the best deal for your business — involves more than entering your postcode and annual consumption into a price comparison website:

Annual consumption accuracy: The quotes you receive are priced against your stated annual gas consumption in kWh. If your stated consumption is significantly above or below your actual usage, the quoted rates may not represent your true cost — suppliers sometimes price higher-volume brackets at lower unit rates and lower-volume brackets at higher rates. Use your actual metered annual consumption from your last bill or meter reads, not an estimate.

Consumption profile: For larger gas users, the seasonal profile of consumption — how much more gas you use in winter versus summer — affects contract sizing and may affect pricing. A business with very peaky winter consumption and near-zero summer consumption has a different risk profile for the supplier than one with flat year-round consumption. This profile affects which suppliers are most competitive for your specific pattern.

Contract length options: Quotes for 12-month, 24-month, and 36-month contracts often have meaningfully different unit rates — reflecting the forward curve shape and the additional risk premium suppliers embed for longer commitments. Comparing only 12-month quotes when a 24-month deal might deliver better value (or vice versa) misses an important dimension of the comparison.

All-inclusive vs pass-through terms: A gas contract that passes through transportation charge changes during the contract term has a different cost certainty profile from one where the total rate is fixed. For standard small-to-medium SME gas contracts, all-inclusive is the norm. For larger contracts, pass-through structures are more common. Understanding which you’re comparing — and whether it matters for your budget certainty requirements — is part of a complete comparison.

Supplier financial robustness: The cheapest quote from a financially marginal supplier is not the same proposition as the second-cheapest from a financially robust operator. The 2021 supplier collapse demonstrated this clearly — 29 suppliers failed, leaving business customers on expensive out-of-contract arrangements. Supplier credit quality is a legitimate consideration in the comparison.

The Five Comparison Mistakes Businesses Consistently Make

1. Comparing only the unit rate, not the standing charge. A contract with a slightly lower unit rate but a significantly higher daily standing charge may cost more in total than one with a slightly higher unit rate and lower standing charge. For lower-consumption businesses, standing charges are proportionally more significant. Always compare total annual cost, not just unit rate.

2. Using estimated consumption rather than actual metered figures. Comparison quotes priced on inaccurate consumption data don’t represent your actual cost. The rate offered for 50,000 kWh/year consumption may differ from the rate for 75,000 kWh/year consumption. Provide accurate figures.

3. Accepting the single quote from the incumbent at renewal. Suppliers set renewal offers at levels that assume non-shopping customers will accept without comparison. A single renewal quote is the starting point for negotiation, not the end point. Going to the full market — 10–20 suppliers — consistently produces better outcomes.

4. Comparing on the cheapest broker’s quote rather than the cheapest market rate. If two brokers quote you on the same underlying supplier at different rates, the difference is broker commission. Ask what commission is embedded in each quote and compare the underlying supplier rate, not just the headline number presented to you.

5. Not checking CCL and VAT status before comparing. If you’re eligible for reduced CCL (Climate Change Agreement holder) or 5% VAT (qualifying residential or charity use), a comparison that doesn’t reflect those reliefs is comparing the wrong number. Establish your CCL and VAT status before asking for quotes and ensure the comparison reflects it.

The Market in 2026: What to Expect When You Compare

UK business gas prices in 2026 remain elevated relative to pre-2021 historical norms but significantly below the 2022 crisis peaks. The forward curve heading into 2026 reflects a market that is tighter than pre-crisis norms — import dependency is higher, storage is a variable rather than a constant, and geopolitical risk premiums are embedded — but not in the acute crisis phase of 2022–23.

For most SMEs comparing business gas contracts in 2026, the competitive unit rate available through a properly conducted 10–20 supplier tender will be meaningfully below what an incumbent renewal offer provides. Our benchmark: a business that has not been through a competitive tender in the last 12–18 months should expect to find market rates 15–25% below its current effective rate.

How to Compare Business Gas Through Telnergy

We access 18+ suppliers for every business gas comparison we conduct. We provide a full comparison showing all quotes received, with our commission disclosed. We consider contract length, supplier robustness, and term structure — not just the headline unit rate.

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Telnergy Limited • Independent Energy Consultants since 2002 • Ofgem TPI Registered • Christchurch, Dorset