Cal. BPC § 320

Whenever there is pending before any state commission, regulatory agency, department, or other state agency, or any state or federal court or agency, any matter or proceeding which the director finds may affect substantially the interests of consumers within California, the director, or the Attorney General, may intervene in such matter or proceeding in any appropriate manner to represent the interests of consumers. The director, or any officer or employee designated by the director for that purpose, or the Attorney General, may thereafter present to such agency, court, or department, in conformity with the rules of practice and procedure thereof, such evidence and argument as he shall determine to be necessary, for the effective protection of the interests of consumers.