Cal. Public Utilities Code - PUC § 50067. Section 50067.
The term of office of each director is four years from the time of his appointment, except that the chairman first appointed shall hold office for two years, and the remaining directors first appointed to the board shall classify themselves by lot, so that the two appointed by the board of supervisors shall hold office for one and three years and the two appointed by the city council shall hold office for two and four years.