C. No person shall engage in the transportation of intrastate natural gas for others, subject to the jurisdiction of the commissioner, or undertake the construction or extension of any facilities therefor, or acquire or operate any such facilities or extensions thereof, unless there is in force with respect to such person an order of the commissioner authorizing such acts or operations unless exempt therefrom under the terms of this Chapter or waived by the commissioner under the authorities granted hereunder. Provided, however, that if any such person or predecessor in interest was bona fide engaged in transportation of natural gas, subject to the jurisdiction of the commissioner, prior to the effective date of this Chapter, over the route or routes or within the area for which application is made and has so operated since that time, the commissioner shall issue such order without requiring further proof that the public interest will be served by such operation, and without further proceedings, if application for such order is made to the commissioner within ninety days after passage of this Chapter. Pending the determination of any such application, the continuance of such operation shall be lawful. In all other cases the application shall be decided in accordance with the procedures otherwise provided in this Chapter, and such order shall be issued or denied accordingly. Provided, however, that the commissioner may issue a temporary order in cases of emergency, to assure maintenance of adequate service or to serve particular customers, without notice or hearing, pending the determination of an application for a permanent order, and may by regulation exempt from the requirements of this Section temporary acts or operations for which the issuance of an order therefor will not be required in the public interest.