Cal. Elec. Code § 7843
In each year of the general election at which electors of President and Vice President of the United States are to be chosen, the convention meeting of the state central committee shall also nominate as the candidates of its party as many electors of President and Vice President of the United States as the state is then entitled to, 50 percent of whom shall be women and 50 percent men, unless an odd number of electors is to be chosen, in which case the difference between the number of women and men shall be not more than one. The convention meeting shall also nominate an alternate elector for each elector chosen, for the purposes of Chapter 1.2 (commencing with Section 6911) of Part 2 of Division 6. The chairperson of the state central committee shall certify the name of each elector and alternate elector nominated, and the elector's and alternate elector's residence address to the Secretary of State.
Ca. Elec. Code § 7843