Dive Brief: Arizona Public Service (APS) has sent a letter to both the state senate and governor's office, expressing opposition to proposed legislation that would bar the state's utility regulators from mandating decarbonization. The Arizona Corporation Commission (ACC) voted in November to require the state's utilities to achieve 100% clean energy generation by 2050. The Arizona House and Senate have introduced twin bills to overturn the ACC's decarbonization rules and to prevent such rules in the future. APS had remained publicly neutral toward the two bills until Thursday. The company has decided to oppose both bills in light of increasing regulatory uncertainty, according to an APS letter to state lawmakers and to the governor's office.