NAVFAC Pacific


Pacific Missile Range Facility, Makaha Ridge, Kauai, Hawaii


$ 41,025,710

Upgrade Power Plant & Electrical Distribution System, Kauai, Hawaii

The work includes construction to upgrade the standby power plant (Building #711) to provide sufficient generation capacity to support the range systems at Makaha Ridge. The project also upgrades the exterior electrical distribution system to an underground, dual-feed, loop-configured, primary electrical distribution system.  The new system includes approximately 8,000 linear feet of duct structure for the north and south loops and includes 20 new concrete octagonal manholes. 

The existing power plant building steel framing and concrete footings remain. The building foundation upgrade work includes grade beams under the generator room and separate concrete pads to support the new engine-generators. Demolition includes the removal of the existing equipment and concrete slab. New prefinished metal panels are replacing the existing asbestos containing wall siding and roof panels.  The expanded power plant facility includes a generator room with secured open storage, control room, restroom, coffee mess, telecommunications room and electrical switchgear room. Covered areas are also being added for fire suppression equipment and mechanical pumps.  Secondary building service connections to the Makaha Ridge facilities from the upgraded electrical distribution system service transformers are also provided.

The new electrical equipment installed by this project includes four 485 kW/480V Diesel Engine Generators, several transformers, and pad-mounted switches.  The fuel system supplying the new generators consists of four 275-gallon day tanks and two 8,000-gallon tanks with leak detection

New mechanical system installation includes HVAC, carbon-dioxide fire-extinguishing piping and system, compressed air system (21.2 CFM), and Lube Oil and Urea Systems with storage tanks as well as a fire alarm system. The building also features a new 7.5-ton bridge crane.

The existing facility must remain in service throughout construction. Two 725kW temporary Diesel Engine Generators have been provided to ensure power during the 2-year power plant modification.



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