40. A controller acting in virtue of this act may, on any day not a holiday, between eight hours and eighteen hours:(a) have access to any land, to any plant and to any construction or material whatsoever of a distributor, make a full examination thereof and take cognizance of any books, plans, specifications, drawings and documents whatsoever that he deems useful to consult;
(b) take all the information that he deems useful respecting the watercourses, waterfalls, rapids and constructions, on the premises or elsewhere;
(c) bring and utilize upon the premises the equipment and the instruments deemed necessary by him for his investigations and make use of those found there;
(d) examine, make an inventory of and valuate, subject to revision by the Board, the physical assets, within the meaning of this act, of any electricity distributor, or the property of any gas distributor.