California Code, Public Utilities Code - PUC § 7726

(a) When the secretary or the commission determines that any person has engaged in, is engaged in, or threatens to engage in, any practice or act which constitutes a violation of this article, or any regulation or order issued, adopted, or executed pursuant to this article, the secretary or commission may issue an order requiring that person to cease and desist.

(b) Any cease and desist order issued by the secretary or commission may be subject to such terms and conditions as the secretary or commission may determine are necessary to ensure compliance with this article.

(c) Any cease and desist order issued by the secretary or commission shall become null and void 90 days after issuance.

(d) A cease and desist order issued by the secretary or commission shall be effective upon the issuance thereof, and copies shall be served immediately by certified mail upon the person or governmental agency being charged with the actual or threatened violation.

(e) The commission may authorize its executive director to exercise the commission's authority to issue cease and desist orders pursuant to this section.