Cal. Educ. Code § 17922

State funds may, upon appropriation by the Legislature, be distributed to the Superintendent of Public Instruction for distribution to districts and county offices of education for the purchase of low- or zero-emission schoolbuses that replace, or increase the number of, schoolbuses in the existing schoolbus fleet or for retrofitting existing schoolbuses to achieve reductions in emissions. State funds that are provided pursuant to this part shall not exceed the amount of funds provided from other sources.