The Arizona Corporation Commission (ACC) is a state regulatory agency established by Article 15 of the Arizona Constitution in 1912. It is responsible for regulating public utilities, securities, railroad safety, and pipeline safety in the state of Arizona. The commission consists of five elected commissioners who serve four-year terms. The ACC’s primary function is to regulate public service corporations, including electric, gas, water, telephone, and sewer utilities. It ensures these utilities provide safe, reliable, and affordable services to Arizona residents. The commission sets rates for regulated utilities and oversees their operations to protect consumer interests. In addition to utility regulation, the ACC’s Securities Division enforces state securities laws and protects investors from fraudulent investment schemes. The commission also maintains oversight of railroad crossings and pipeline safety throughout Arizona. The agency operates independently from the state’s executive branch and is one of only seven state utility regulatory bodies in the United States whose commissioners are chosen through statewide election rather than gubernatorial appointment. The ACC’s decisions significantly impact Arizona’s economic development and environmental policies, particularly in areas related to renewable energy standards and energy efficiency programs.