Md. Code Regs. 20.07.02.10
In all cases in which the Commission, at the request of or complaint of a corporation subject to the provisions of the Public Utilities Article, Annotated Code of Maryland, may undertake an investigation with a view to granting to the corporation any application which the corporation may be authorized under the law to make, the Commission may, in its discretion, give all other persons or corporations who may be affected by the application or the investigation an opportunity for a hearing, either by service upon them of a copy of the request or complaint, or by publication of the substance of it, at the expense of the corporation, for such length of time and in such newspaper or newspapers as the Commission may deem desirable.
Md. Code Regs. 20.07.02.10