Third Power Plant Overhaul Project

Project Summary Project Schedule News and Photos

Project Update - Third Power Plant (TPP) Status Report – January 9, 2019

Mechanical Overhaul of Units G-22, G-23, G-24: Construction phase work on this current contract continues; Unit G24 was overhauled and returned to service in April of 2016, and Unit G23 is on track to conclude its overhaul by March of 2019. Significant challenges with each of the first two units have extended the duration of this contract, which was originally scheduled to be complete at the end of 2017. Major wear on components including the wicket gates, shaft assemblies, thrust bearing, rotor, and outer head cover have all contributed to additional work for the government and the contractor. We are focused on beginning the overhaul work for the last unit, G22 this spring, utilize lessons learned from the first two units and complete remaining contract work by the end of 2020.

Overhaul of Units G-19, G-20, G-21: Originally, the plan for Units G19-G21 was to overhaul similar to the G22-G24 Contract. Because of what was found throughout the overhaul of the first two units, what is expected of the third unit, and what Reclamation has observed from a maintenance perspective on G19-G21, the work plan for these three older units has evolved over the past few years. The ultimate goal for this project is to ensure reliability and provide three modernized units that will operate with flexibility and durability over the next 40+ years.

There will be a significant change in the approach from the G22-G24 contract. The employment of a “Design-Build” philosophy, utilizing a two-phased solicitation process. Competing offerors will be able to consider replacement of and/or retention of unit components; contractors will essentially be given an “open hole” to work with, so to speak, and offer the best design solution to achieve the above objective. We anticipate moving this project to the procurement phase sometime in mid-FY19 and begin the solicitation phase. Efficiencies and increases of power are expected to inherently come out of these modernized and more robust units. Once the phase two award is made, a final scope and cost for the contract shall be negotiated and the selected contractor will proceed with finalizing the design and manufacture of new components and start physical work on site sometime by FY24.

As part of the Third Powerplant Overhaul Project, the contractor has prepared a simulation of the base scenario showing step-by-step how the units will be disassembled and placed in various locations. The animation was prepared using CAD files and other types of software listed in the credits. There is no audio in this version of the animation.

This interactive PDF showcases a 3D model of a generator and allows you to take it apart, rotate it, and view it in detail. Download the 9 mb PDF >>

Related Links
Third Power Plant Generating Units Overhaul Activities EA Addendum
Third Power Plant Generating Units Overhaul Activities EA & FONSI
Grand Coulee's Third Power Plant 500-Kilovolt Transmission Line Replacement Project FONSI
Grand Coulee's Third Power Plant 500-Kilovolt Transmission Line Replacement Project EA (BPA)

Lynne Brougher
Public Affairs Officer
(509) 633-9503

Last Updated: 1/9/19