The Electricity (Class Exemptions from the Requirement for a Licence) Order 2001

C.1.  The following provisions have effect for the purposes of Class C. E+W+S

(1) Where at any time the supplier in question and some other person generate electricity at the same generating station or provide the output of the same generating station, the generation of electricity by that other person or the provision of the output of that generating station by that other person shall be treated as the generation of electricity and the provision of the output of that generating station respectively by that supplier if that other person, being a body corporate, is associated with that supplier.

(2) Two or more generating sets which are operated by the same person or by bodies corporate which are associated with each other shall be treated as a single generating station if they are on the same site as each other (whether or not there is an electrical interconnection between any of them) but otherwise shall be treated as separate generating stations, and in this sub-paragraph—

(a) “generating set” means a combination of the plant and equipment that produces electricity and any other plant or equipment by which that plant or equipment is driven; and

(b) generating sets shall be treated as being on the same site as each other if they are—

(i) situated on the same premises as each other;

(ii) situated on premises which are immediately adjoining each other; or

(iii) situated on premises which are separated from each other only by a road, railway or watercourse or by other premises occupied by the supplier in question or by a body corporate which is an associate of that supplier.