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Meaning of 'combined heat and power station' (CHP), etc

In the CCL rules a 'combined heat and power (CHP) station' is a station producing electricity or motive power that is (or may be) operated for purposes including the supply of heat produced in association with electricity or motive power, or steam produced from, or air or water heated by, such heat¹.

A 'fully exempt CHP station' is a CHP station for which there is in force a 'full-exemption certificate', given by the Secretary of State, stating that the station is a fully exempt CHP station for CCL, and stating the percentage that, for the exemption of supplies (other than self-supplies) to CHP stations, is the efficiency percentage for the station determined under any regulations, and (so far as applicable) any provision made thereby about certificates, applications for certificates and the information that is to accompany an applications².

A 'partly exempt CHP station' is a CHP station for which there is in force a 'part-exemption certificate', given by the Secretary