Existing law vests the Public Utilities Commission with regulatory authority over public utilities, including gas corporations. Existing law requires every public utility to furnish and maintain adequate, efficient, just and reasonable service, instrumentalities, equipment, and facilities as are necessary to promote the safety, health, comfort, and convenience of its patrons, employees, and the public. This bill would require each gas corporation, on or before July 1, 2025, and annually thereafter, to submit to the commission a map containing certain information, including the location of all potential gas distribution line replacement projects identified in its distribution integrity management plan and other foreseeable gas distribution pipeline replacements. The bill would require the commission, on or before January 1, 2026, to designate priority neighborhood decarbonization zones considering, among other things, the concentration of gas distribution line replacement projects identified in the maps. The bill would require the commission, on or before July 1, 2026, to establish a voluntary program to facilitate the cost-effective decarbonization of priority neighborhood decarbonization zones, as defined, not to exceed 30 pilot projects across the state and affecting no more than 1% of each gas corporation's customers within its service territory, except as provided. The bill would prohibit the commission from establishing pilot projects on or after January 1, 2030. The bill would require the commission to establish various processes, criteria, methodology, and requirements in administering the pilot projects, including by establishing the criteria and methodology for determining the cost-effectiveness of zero-emission alternatives, as defined, and establishing the appropriate rate of return and recovery period that a gas corporation is eligible to receive for their costs to implement zero-emission alternatives. The bill would authorize a gas corporation to cease providing, and would require the commission to relieve the gas corporation of its obligation to provide, service in an area within the gas corporation's service territory where a pilot project has been implemented if the commission determines that adequate substitute energy service is reasonably available to support the energy end uses of affected gas corporation customers, as provided. The bill would also require the commission to submit various reports to the relevant committees of the Legislature regarding the pilot projects, as provided. The bill would, except as provided, repeal the above-described provisions on January 1, 2031. Under existing law, a violation of the Public Utilities Act or an order, decision, rule, direction, demand, or requirement of the commission is a crime. Because the above requirements would be codified in the act and a violation of those requirements or a commission action implementing those requirements would be a crime, this bill would impose a state-mandated local program. The California Constitution requires the state to reimburse local agencies and school districts for certain costs mandated by the state. Statutory provisions establish procedures for making that reimbursement. This bill would provide that no reimbursement is required by this act for a specified reason.