The Commission may further allow any other interested person to intervene as a party or to participate in more limited manner as the Commission or its Presiding Officer may designate.
A petition for leave to intervene must be filed by the date specified by the Commission or the Presiding Officer or, if an earlier date is not specified, by the date of the public hearing. A petition to intervene which is not timely filed will be denied unless the petitioner shows good cause for failure to file on time. A person permitted to intervene shall become a party to the proceeding and shall be permitted to participate in all phases of the hearing, subject, however, to such limitations as the Commission or Presiding Officer may direct. Petitioners may be required to consolidate or join their appearances in part or in whole if their interests or contentions are found to be substantially similar and such consolidation would expedite or simplify the hearing without prejudice to the rights of any party or petitioner. A consolidation under this section may be for all purposes of the proceeding, all of the issues of the proceeding or with respect to any one or more issues or purposes thereof.
01- 672 C.M.R. ch. 5, § 13