Maryland Code, Public Utilities § 3-106

(1) the parties to the proceeding adequately represent the interest of the person seeking to intervene; or

(2) the issues that the person seeks to raise are irrelevant or immaterial.

(c)(1) An intervenor has all the rights of a party to a proceeding.

(2) In a proceeding before the Commission, an individual who is an intervenor may represent himself or herself.