(a) Persons notified. Except when the commission or the presiding officer shall otherwise direct, the commission shall give written notice of a hearing in any pending matter to all parties, to all persons who have been permitted to participate as intervenors, to all persons otherwise required by statute to be notified, and to such other persons as have filed with the commission their written request for notice of hearing in a particular matter. Written notice shall be given to such additional persons as the commission shall direct. The commission or the presiding officer may give such public notice of the hearing as the commission or the presiding officer, as the case may be, shall deem appropriate within the provisions of the Freedom of Information Act.

(b) Contents of notice. Notice of a hearing shall include, but shall not be limited to, the following: (1) a statement of the time, place and nature of the hearing; (2) a statement of the legal authority and jurisdiction under which the hearing is to be held; (3) a reference to the particular sections of the statutes and regulations involved; and (4) a short and plain statement of the matters asserted or, in lieu thereof, a copy of the complaint.