Regulation 4 of the Principal Regulations is amended as follows:(a) by omitting from subregulation (1)(a) "stand-alone" ;(b) by omitting paragraph (b) from subregulation (1) and substituting the following paragraph:(b) the electricity is (i) generated by a generator that is not normally connected to a power system or has a primary function other than the generation of electricity for sale; and(ii) not sold.(c) by inserting the following paragraphs after paragraph (a) in subregulation (3) :(ab) a person who sells electricity only to another person who holds a licence authorising the retailing of electricity; or(ac) the owner of an electricity generating plant of historic significance in relation to the sale of electricity generated by that plant; or