[12 Methods of calculating therms]
Gas Act 1986 (1986 c 44) | Legislation

[Gas conveyed by [gas transporters]]

[12  Methods of calculating therms]

[(1)     Except in prescribed cases, the number of therms or kilowatt hours conveyed by a [gas transporter] to premises, or to pipe-line systems operated by other [gas transporters], shall be calculated in the prescribed manner—

(a)     on the basis of calorific values of the gas determined by the transporter in accordance with regulations under this section, or so determined by another [gas transporter] and adopted by the transporter in accordance with such regulations; or

(b)     if and to the extent that regulations under this section so provide and the transporter thinks fit, on the basis of declared calorific values of the gas;

and regulations under this section shall be made by [the Authority] with the consent of the Secretary of State.

(2)     In this Part—

“calorific value”, in relation to any gas, means the number of megajoules (gross) which would be produced by—

(a)     the combustion of one cubic metre of the gas measured at a temperature of 15 degrees C and a pressure of 1013.25 millibars; or

(b)     if regulations under this section so provide, the combustion of one kilogram of

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