How to compare business gas prices properly

Comparing business gas prices well means converting every quote into a total annual cost using your actual consumption, rather than ranking suppliers by unit rate alone. A cheaper pence-per-kWh rate can still lose to a slightly higher one once the standing charge is included, particularly for lower-volume users.

Start by locating your MPRN, the meter point reference number for your gas supply, on a recent bill. This identifies your exact meter and is required for any supplier to produce an accurate quote.

Pull together twelve months of gas consumption in kWh if available. Gas usage is often more seasonal than electricity, driven heavily by heating demand, so a single month's bill can give a misleading impression of your annual pattern and the rate you should expect.

Request quotes from several suppliers within the same short window, since wholesale gas prices can move meaningfully from one week to the next, especially around cold weather events or supply news. Comparing quotes gathered days or weeks apart is not comparing like for like.

For each quote, calculate the estimated annual cost: unit rate multiplied by annual kWh, plus standing charge multiplied by days in the year. Worked example: 8p per kWh on 30,000 kWh a year is £2,400, plus a standing charge of 28p a day, which is £102.20 a year, for a total of £2,502.20. A competing quote of 7.4p per kWh with a 40p daily standing charge comes to £2,220 plus £146 for a total of £2,366, making it the better deal despite the higher standing charge.

Check contract length options side by side. Gas forward prices can behave differently to electricity forward prices at any given time, so do not assume the cheapest term for your electricity contract will also be the cheapest term for gas.

Ask whether the Climate Change Levy and VAT are shown separately or included in the headline rate quoted, since suppliers present this differently and it affects how you compare the true cost.

Check the contract for pass-through clauses that would allow certain costs to change mid-term, and compare the termination notice period across offers, since a shorter or clearer notice window reduces the risk of drifting onto expensive rates at the next renewal.

If your business qualifies for the reduced 5% VAT rate, for example due to low consumption thresholds or a charitable or partly domestic use of the premises, confirm this is applied correctly on any new contract, since it makes a material difference to the final bill.

Once you have a shortlist, weigh supplier reliability and billing accuracy alongside price. Persistent billing errors or slow query resolution can cost a business more in administrative time than a marginally cheaper unit rate saves.

Where a business has both a summer and winter tariff quote available, it is worth asking the supplier to show the estimated annual cost under both your own actual monthly profile and a flat average profile, since gas suppliers sometimes price time-weighted contracts that reward businesses with genuinely predictable, non-seasonal consumption more than a single blended annual rate would suggest.

Kitchens, laundries and other gas-intensive commercial operations should keep a particular eye on the standing charge when comparing quotes, since these premises often run high enough baseline consumption that the unit rate dominates the total bill far more than it would for a lower-usage office, meaning a small unit rate saving can be worth chasing even if the standing charge on offer is slightly higher.

Whether you are comparing gas, electricity or both together, the underlying discipline never changes: know your meter number, know your consumption, and know your notice deadline before you start requesting quotes, because those three pieces of information are what let a supplier or comparison service move quickly on your behalf.

Even for gas, where network charges vary less by region than they do for electricity, your postcode still has a bearing on the transportation element of the bill, which is another reason a national average pence-per-kWh figure can only ever be a rough starting point rather than a reliable benchmark for your own site.

Billing frequency and detail differ by meter type too. Smaller gas supplies are typically read periodically and billed on estimated or actual monthly consumption, while larger sites crossing the half-hourly equivalent threshold are billed against far more granular data, which tends to sharpen the accuracy, if not always the level, of the quotes on offer.