California Code, Public Utilities Code - PUC § 28750.8

(a) The term of office of any director who has been elected and whose term of office has not expired shall not be affected by any change in the boundaries of the election district from which he was elected.

(b) At the first election for directors following adjustment of the boundaries of the election districts, a director shall be elected for each election district under the readjusted election district plan that has the same number as an election district whose incumbent's term is due to expire.

(c) Notwithstanding any other provision of this article, a change in the boundaries of an election district shall not be made within 90 days prior to the final date of voter registration for an election of directors.