The commission, upon its own initiation or upon motion, may consolidate for hearing or for other purposes or may contemporaneously consider two or more proceedings which involve substantially the same parties or issues which are the same or closely related, if it finds that such consolidation or contemporaneous hearing will be conducive to the proper dispatch of its business and to the ends of justice and will not unduly delay the proceedings.
Haw. Code R. § 21-1-5