13. (1) Municipal corporations which have established an electricity system in common, under subsection 1 of section 12, may, by agreement, order the partition thereof between themselves.Such power shall be exercised by means of a by-law adopted by each of them, in accordance with the formalities prescribed by sections 3 and 4.
(2) If the municipal corporations agree as to the expediency of dividing the system between them, but do not agree on the terms of such division, they may refer the matter to the Board, which shall decide in last resort any question relating thereto.