A calorific value (CV) is a measurement of the amount of energy contained in gas, measured in megajoules per cubic meter (MJ/m cubed).
The CV of the gas at each Local Distribution Zone is continually measured by the National Grid who sends this figure to us, and we use it for our calculations. Typically, a gas supply has a CV between 37.5 and 43.0 MJ/m cubed. You can use 40.0 as a default number if you don’t have the exact figure.
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