Public Utilities Code § 103508
ARTICLE 1. Authorization and Issuance of General Obligation Bonds
After the expiration of three years after a bond election, the board may determine, by ordinance adopted by a vote of two-thirds of all the members of the board, that any or all of the bonds authorized at the election remaining unsold shall not be issued or sold. When the ordinance takes effect, the authorization to issue those bonds shall become void.