Cal. Sts. & Hy. Code § 5898.21
Notwithstanding any other provision of this chapter, upon the written consent of an authorized public agency official, the proposed arrangements for financing the program pertaining to the installation of distributed generation renewable energy sources or energy or water efficiency improvements that are permanently fixed to real property may authorize the property owner to purchase directly the related equipment and materials for the installation of distributed generation renewable energy sources or energy or water efficiency improvements and to contract directly for the installation of distributed generation renewable energy sources or energy or water efficiency improvements that are permanently fixed to the property owner's residential, commercial, industrial, agricultural, or other real property.
Ca. Sts. and High. Code § 5898.21