Minn. Stat. § 216B.18: SERVICE OF NOTICE.

Service of notice of all hearings, investigations, and proceedings pending before the commission and of complaints, reports, orders, and other documents must be made personally, by electronic service as provided in section 216.17, or by mail as the commission may direct. Regulated utilities and state agencies must provide an electronic address to the commission for electronic service purposes and agree to accept electronic service as official service.