GPA: Tumon Substation Near 100% Complete


Guam – A major capital improvement project to upgrade the Tumon Substation is near 100% completion. Motorists Northbound along Route 1 in Upper Tumon can view the project across John F. Kennedy High School and in front of KMart. 


A new transformer with more capacity has been installed and is currently online. Improvements include a greater capability to backfeed (reroute power) and support other distribution lines to improve system reliability and redundancy, enhanced transformer health diagnostics, along with a new transformer containment pad to comply with environmental protection regulations.

“This project was part of a $70M upgrade for the Island Wide Power System to improve power quality and reliability,” stated Joven Acosta, P.E. Manager of Engineering, “The funds are part of GPA Revenue Bonds issued in 2010 for major capital improvement projects (CIPs) to enhance GPA’s power services to its customers.”

Two major scheduled outage notices were issued for Tumon in support of the completion of the project. The outage involved GPA line crews placing back into original configurations underground lines that were rerouted to allow the installation of a new power transformer with increased capacity at the new Tumon Substation project.