Section 17: Restriction on establishment or extension

17. Restriction on establishment or extension (1) No undertaker shall establish a new or extend any existing generating station or main transmission line without the consent of the Board and an undertaker shall, as an alternative to the establishment of a new or extension of an existing generating station or main transmission line, if so required by the Board, enter into and carry into effect arrangements for taking a supply of electricity from some other available source designated by the Board, and the arrangements shall be made on such terms and conditions as the Board may require. (2) The Board shall not refuse its consent to the extension of an existing generating station or main transmission line by an undertaker, or require the undertaker to take a supply of electricity from some other available source, if it is proved to its satisfaction that, having regard to all the circumstances of the case, the undertaker is or will be in a position to give a supply of electricity adequate in quantity and regularity to meet the prospective demand of his or its consumers at a cost not greater than that at which he or it could give a supply if he or it obtained a supply of electricity from some other available source designated by the Board, unless the Board determines that such refusal or requirement is necessary in the interests of the general supply of electricity in the district. 18. —