California Code, Public Utilities Code - PUC § 120509

(a) Upon the request of the board, as defined in Section 120508, with the consent of any labor organization acting as the exclusive representative of employees whose collective bargaining rights are subject to Section 120508, the board may enter into a contract to enroll the collectively bargained employees as members of the Public Employees' Retirement System or another retirement system.

(b) A contract to enroll employees in the Public Employees' Retirement System shall be subject to the provisions of Part 3 (commencing with Section 20000) of Division 5 of Title 2 of the Government Code.

(c) Employees transferred from any existing retirement system or pension plan to the Public Employees' Retirement System or any other retirement system by operation of this section shall receive benefits immediately after enrollment in, or transfer to, the system that are at least equal to, or greater than, the benefits the employees would have been entitled to immediately before enrollment in, or transfer to, the system.