Dive Brief: The Arizona Corporation Commission (ACC) voted down its proposed clean energy rules at Wednesday's open meeting, ending a three-year collaborative process with broad stakeholder and utility support to transition the state's generation to 100% clean resources by 2050. The rules were rejected 3-2 after commissioners approved an amendment from Commissioner Justin Olson that changed the clean energy mandates into goals, making the rules less enforceable. Olson proceeded to vote against the final package, noting in the hearing that he preferred a free market solution to resource choices in the state. The rejected rules would have created an all source requirement for utility request for proposals (RFP), an increase in energy efficiency codes, an energy storage requirement and a slew of other clean energy initiatives. Solar and clean energy advocates said they were "extremely disappointed" by the outcome on Wednesday, after working with the state's investor-owned utilities to compromise on the language of the rules.