(1) All documents, pleadings, and papers to be filed shall be eight and one-half inches by eleven inches (8½" x 11") in size, standard quality, opaque, unglazed paper, with a minimum 50% recycled content, of which least 10% shall be postconsumer waste, and in 12-point font or larger, double-spaced, and clearly legible. Exhibits or other documents shall be reproduced in like size unless the original exhibit is required. The commission may require the reproduction of an oversized demonstrative or other exhibit in a size appropriate for the record.
(2) Copies of all submissions filed must be served upon all parties of record, including intervenors or other parties allowed to appear for special purposes, and all submissions must contain or be accompanied by a certificate of service showing proof of the method of service and the date upon which such service was made. Service of copies of submissions upon parties shall be made in accordance with Rule 5 of the Montana Rules of Civil Procedure and may be made by means of first class mail, postage prepaid, unless the commission designates another manner of service.