Cal. Pub. Res. Code § 25415

(a) Each eligible institution to which an allocation has been made under this chapter shall repay the principal amount of the allocation, plus interest, in not more than 30 equal semiannual payments, as determined by the commission. The first semiannual payment shall be made on or before December 22 of the fiscal year following the year in which the project is completed. The repayment period may not exceed the life of the equipment, as determined by the commission or the lease term of the building in which the energy conservation measures will be installed.

(b) Notwithstanding any other provision of law, the commission shall, unless it determines that the purposes of this chapter would be better served by establishing an alternative interest rate schedule, periodically set interest rates on the loans based on surveys of existing financial markets and at rates not less than 1 percent per annum.

(c) The governing body of each eligible institution shall annually budget an amount at least sufficient to make the semiannual payments required in this section. The amount shall not be raised by the levy of additional taxes but shall instead be obtained by a savings in energy costs or other sources.