(a)
Contracts under this division may provide for the assignment thereof on any terms and conditions as the contracts may specify.
(b)
Any contract for the purchase or sale of electric power shall contain any contractual terms and security provisions as are determined by the department to be necessary or appropriate and the department may enter into such arrangements as may be necessary or appropriate to implement the foregoing.
(c)
Notwithstanding any other provision of law, the department may pay or provide for the payment of power or use of transmission or distribution facilities and other related services prior to the delivery or utilization thereof, provided that the department determines that prepayment is beneficial to ratepayers and that adequate provision has been made for the security of the department.