How gas tariffs are structured
A business gas bill combines the unit rate per kWh consumed with a standing charge covering the fixed cost of maintaining the gas network connection and meter. Larger gas users may also pay a capacity charge reflecting the maximum rate at which gas can be drawn from the network.
Seasonal pricing patterns
Wholesale gas prices often rise in the autumn and winter months when heating demand increases across the UK and Europe, and can fall in spring and summer as demand eases. Businesses renewing a gas contract close to winter may see higher quoted rates than those renewing in warmer months, though this is not guaranteed and depends on wider market conditions including gas storage levels.
Fixed versus variable gas tariffs
| Feature | Fixed tariff | Variable tariff |
|---|---|---|
| Rate certainty | Locked for contract term | Changes with market |
| Best suited to | Budget-focused businesses | Businesses tracking the market actively |
| Risk | Locked in if market falls | Exposed if market rises |
| Typical term | 1 to 5 years | Rolling or short term |
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Annual Quantity and consumption estimates
Suppliers use an estimated Annual Quantity, based on historical or estimated usage, to model expected consumption when quoting a gas contract. If actual usage differs significantly from the AQ, some contracts include an adjustment mechanism, so it is worth understanding how a supplier handles under or over-consumption against the AQ before signing.
Choosing a gas contract length
- Shorter terms suit businesses expecting the market to fall
- Longer terms suit businesses prioritising budget certainty
- Multi-year deals can secure a lower average rate but reduce flexibility
- Renewal timing relative to seasonal demand can affect the rate offered