California Public Utilities Code
The adoption, terms, and conditions of any retirement system covering employees of the district in a bargaining unit represented by a labor organization shall be pursuant to a collective bargaining agreement between the labor organization and the district. For purposes of this section, "officers" does not include members of the board.
The board may contract with the Board of Administration of the Public Employees' Retirement System or with a retirement system maintained pursuant to the County Employees Retirement Law of 1937 and enter all, or any portion, of its employees under either of those systems. Employees of the district in a bargaining unit that is represented by a labor organization shall not be included in the contract except as authorized by a collective bargaining agreement.
All persons receiving pension benefits from an acquired public utility, and all persons entitled to pension benefits under any pension plan of the acquired public utility, may become members or receive pensions under a pension plan established by the district by mutual agreement of those persons and the district. The agreement may provide for the waiver of all rights, privileges, benefits, and status with respect to the pension plan of the acquired public utility.