7.—(1) For the purposes of regulations 8 (gas and heat), 9 (electricity) and 10 (water), “supply” includes—
(a)generation;
(b)production, with the exception of the production of gas in the form of extraction; and
(c)wholesale and retail sale.
(2) For the purposes of regulation 14 (extraction of oil and gas and exploration for, or extraction of, coal or other solid fuels) “supply” includes production of gas in the form of extraction.