Colorado’s Order to Use Carbon Cost in Energy Resource Plans Pathway: Electricity Decarbonization → Phasing Out the Use of Fossil Fuels for the Generation of Electricity → Carbon Adders in Rates and Utility PlanningJurisdiction: Public Utilities → State Public Utility CommissionsJurisdiction: Public Utilities In 2017, the Colorado Public Utility Commission (PUC) ordered Xcel to use the social cost of carbon Energy Resource Plan (ERP) that would guide utility investments through 2024.