Arizona's largest utilities rely on coal (36.20%), natural gas (27.30%), and nuclear (28.80%) for their energy needs. Arizona's current peak load requirement is around 22,000 MW while current resource capacity is around 21,000 MW. In 2012, merchant generating facilities like Arlington Valley and Gila River had monthly capacity factors ranging from -20% to 100%, while utility facilities like Apache Station and Desert Basin ranged from 0% to 80%. Arizona's energy policy is set by the Legislature, Governor, and Corporation Commission with input from the Arizona Department of Environmental Quality, Joint Legislative Review Committee, utilities, merchants, and other stakeholders.
