Arizona rivers have the potential to host 4 hydroelectric power plants of more than 1 MW capacity each at existing dams, plus one on the Colorado River, according to a study by Oak Ridge National Laboratory for the US Dept. of Energy.
Overall, the report concludes that nationwide "Hydropower generation could increase by 12 GW, or about 15% of current
capacity, without building one dam on the nation’s waterways."
Ref: An Assessment of Energy Potential at Non-Powered Dams in the United States, by Boualem Hadjerioua, Yaxing Wei and Shih-Chieh Kao, Oak Ridge National Laboratory, April 2012, 44p.