The board of county commissioners shall, at the time of granting any franchise provided in NRS 709.210, require the applicant to enter an undertaking to the county, in a sum to be determined by the board of county commissioners, with a surety or sureties approved by the board, conditioned that such applicant shall commence active construction of the electric light, heat or power lines for which such franchise is granted within 6 months from the date of granting the same and prosecute the construction thereof to completion with due diligence; and failing to comply with the conditions of such undertaking the applicant shall forfeit all rights to the franchise.
NRS 709.220