P.R. Laws tit. 27, § 1260
(a) Every hearing or investigation shall be instituted upon order of the Commission. The order shall give timely notice of:
(1) The time when and the place where it will be held.
(2) The legal authority by virtue of which it is held.
(3) The findings of fact and issues of law on which the Commission wishes to receive evidence or listen to reports.
Such order shall be served in the manner provided in this part.
The order may be amended on motion or on petition of a party or of an intervener, filed pursuant to the rules of the Commission. Intervention in the proceedings shall be given to those persons who might be adversely affected, if the petition in question is pronounced in order, provided such persons file a motion to intervene in accordance with the rulings of the Commission.
(b) Every hearing or investigation held by the Commission shall be presided over by one or more Commissioners, examiners or employees of the Commission, who shall have the powers provided in §§ 1054(c) and 1121 of this title.
(c) All parties to a hearing or investigation shall have the right to present their case or defense through oral or written evidence, to submit proof of rebuttal, and to conduct such cross-examinations as may be necessary to a complete and true disclosure of the facts. In cases about the adoption of rules or the fixing of rates, or in such other cases as the Commission may consider it desirable or practicable, the latter may adopt procedures for the presentation in writing of all or part of the evidence.
(d) The Commission is authorized to make rules for its proceedings.
History —June 28, 1962, No. 109, p. 288, § 49; June 27, 1974, No. 103, Part 1, p. 341, § 6.