Natural Power Concepts personnel and Lt. Col. Scott Fitzner, of the AFRL Materials and Manufacturing Directorate, inspect the spoke wheel medium wind power system, one of a number of energy-harvesting technologies being installed as part of the five-year, $20 million cooperative agreement with AFRL that will establish a microgrid demonstration project at Joint Base Pearl Harbor-Hickam in Hawaii. (Courtesy photo/Hawaii Center for Advanced Transportation Technologies)