CALIFORNIA CODES PUBLIC UTILITES CODE SECTION 2790
2790. (a) The commission shall require an electrical or gas corporation to perform home weatherization services for low-income customers, as determined by the commission under Section 739, if the commission determines that a significant need for those services exists in the corporation's service territory, taking into consideration both the cost effectiveness of the services and the policy of reducing the hardships facing low-income households.
(b) (1) For purposes of this section, "weatherization" includes, where feasible, any of the following measures for any dwelling unit:
(A) Attic insulation
(D) Low flow showerhead
(E) Waterheater blanket
(F) Door and building envelope repairs which reduce air infiltration.
(2) The commission shall direct any electrical or gas corporation to provide as many of these measures as are feasible for each eligible low-income dwelling unit. (c) "Weatherization" may also include other building conservation measures, energy-efficient appliances, and energy education programs determined by the commission to be feasible, taking into consideration both the cost effectiveness of the measures and the policy of reducing the hardships facing low-income households.