Hawaii Revised Statutes Division 1. Government § 269-7

(a) The public utilities commission and each commissioner shall have power to examine into the condition of each public utility, the manner in which it is operated with reference to the safety or accommodation of the public, the safety, working hours, and wages of its employees, the fares and rates charged by it, the value of its physical property, the issuance by it of stocks and bonds, and the disposition of the proceeds thereof, the amount and disposition of its income, and all its financial transactions, its business relations with other persons, companies, or corporations, its compliance with all applicable state and federal laws and with the provisions of its franchise, charter, and articles of association, if any, its classifications, rules, regulations, practices, and service, and all matters of every nature affecting the relations and transactions between it and the public or persons or corporations.

(b) The commission may investigate any person acting in the capacity of or engaging in the business of a public utility within the State, without having a certificate of public convenience and necessity or other authority previously obtained under and in compliance with this chapter or the rules promulgated under this chapter.

(c) Any investigation may be made by the commission on its own motion, and shall be made when requested by the public utility to be investigated, or by any person upon a sworn written complaint to the commission, setting forth any prima facie cause of complaint. A majority of the commission shall constitute a quorum.