Public Utilities Code § 3104
ARTICLE 6. Directors and Management
The bylaws may provide that the territory in which the association has members shall be divided into districts and that the directors shall be elected by representatives or advisers, who themselves have been elected by the members from the districts. In that case, the bylaws shall specify the number of representatives or advisers to be elected by each district, and the manner and method of reapportioning the representatives or advisers and of redistricting the territory of the association.