The Public Utilities Commission shall make an order under § 49-34A-29 only if it finds that an issue or assumption is for some lawful object, within the corporate purposes of the applicant and compatible with the public interest, which is necessary or appropriate for or consistent with the proper performance by the applicant of service as a public utility and which will not impair its ability to perform that service, and is reasonably necessary or appropriate for such purposes.
SDCL 49-34A-32