Officials held a groundbreaking ceremony for the 50 MW power plant at Schofield Barracks on Monday.
The plant will supply electricity to Oahu's power grid. But during outages, it will give first priority to powering Schofield Barracks and other nearby Army facilities. Any leftover capacity will supply Oahu's electrical grid.
Hawaiian Electric says the plant will boost the resilience of the grid and support the development of renewable energy resources on the island.
The plant will be built on 8 acres at the central Oahu base.