In the case of any district described in Section 20560.2, notwithstanding any other provision of this division, each principal payment, other than payments of principal upon optional redemption, on any bonds of the district payable solely from revenue issued for purposes of financing works of the district for the generation, transmission, distribution, or sale of electric power shall be payable on one of the dates designated by the board pursuant to Section 25209.1 for payment of interest on the bonds.