Ukudu Combined-Cycle Power Plant

The Guam Power Authority is strengthening the island's energy infrastructure with a state-of-the-art combined-cycle power facility. As owner's engineer, Stanley provided comprehensive oversight throughout design, construction and commissioning to deliver a facility that supplies approximately two-thirds of the islands’ electricity needs. 

The 198 MW combined-cycle power plant establishes a foundation for grid stability and positions Guam for future renewable energy integration. The facility features three gas turbines with advanced emission control systems, meeting stringent U.S. federal environmental requirements. The three gas turbines and the steam turbine at the Ukudu plant completed their initial testing in 2025, generating up to 198 megawatts total. A comprehensive 17-mile dual-pipeline system delivers both ultra-low-sulfur diesel and future natural gas, providing operational flexibility and fuel diversity that reduces costs and environmental impact. 

Critical black-start capability allows the plant to be the first facility to restore power following major outages, providing essential recovery capability in the event of typhoons or other natural disasters. The plant also incorporates innovative water conservation measures, diverting 2 million gallons of treated wastewater daily for plant cooling to reduce pressure on Guam's vital aquifer. 

Together with the Guam Power Authority, Stanley is helping secure reliable, efficient power for the island, while laying the groundwork for a more sustainable, resilient energy future.