California Code, Public Resources Code - PRC § 25701

(a) Within six months after the effective date of this division, each electric utility, gas utility, and fuel wholesaler or manufacturer in the state shall prepare and submit to the commission a proposed emergency load curtailment plan or emergency energy supply distribution plan setting forth proposals for identifying priority loads or users in the event of a sudden and serious shortage of fuels or interruption in the generation of electricity.

(b) The commission shall encourage electric utilities to cooperate in joint preparation of an emergency load curtailment plan or emergency energy distribution plan.  If such a cooperative plan is developed between two or more electric utilities, such utilities may submit such joint plans to the commission in place of individual plans required by subdivision (a) of this section.

(c) The commission shall collect from all relevant governmental agencies, including, but not limited to, the Public Utilities Commission and the Office of Emergency Services, any existing contingency plans for dealing with sudden energy shortages or information related thereto.