FAQs

What is the calorific value of gas, and why does it vary?

The calorific value is a measure of the energy contained within the gas; it represents the amount of heat released as the gas is burned. An example of this is how quickly the gas can heat up water.

The calorific value is tested continually at various points throughout the national grid system.

Gas delivered to homes near the point where it comes ashore contains a different level of moisture than the gas which is used further inland. The moisture in the gas affects its’ performance and so the calorific value element ensures gas is charged fairly, in relation to how much energy is obtained from it. This prevents customers from being penalised for using more, lower quality gas.