CA Pub Util Code Section 106030

The board, at its first meeting, and thereafter annually at the meeting designated by the board, shall elect a chairperson who shall preside at all meetings, and a vice chairperson who shall preside in the absence of the chairperson. In the event of his or her absence or inability to act, the members present, by an order entered in the minutes, shall select one of their members to act as chairperson pro tempore, who, while so acting, shall have all the authority of the chairperson.