California Code, Government Code - GOV § 11430.70

(a) Subject to subdivisions (b) and (c), the provisions of this article governing ex parte communications to the presiding officer also govern ex parte communications in an adjudicative proceeding to the agency head or other person or body to which the power to hear or decide in the proceeding is delegated.

(b) An ex parte communication to the agency head or other person or body to which the power to hear or decide in the proceeding is delegated is permissible in an individualized ratemaking proceeding if the content of the communication is disclosed on the record and all parties are given an opportunity to address it in the manner provided in Section 11430.50.

(c) An ex parte communication to the agency head or other person or body to which the power to hear or decide in the proceeding is delegated is permissible in an individualized determination of an application for site certification pursuant to Chapter 6 (commencing with Section 25500) of Division 15 of the Public Resources Code, that is before the State Energy Resources Conservation and Development Commission, if the communication is made by an employee of another state agency and is made for the purpose of enabling the presiding officer to effectively manage the proceeding.