Major Turbine Upgrade Scheduled in January at Arizona Power Station

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Researched by Industrialinfo.com (Industrial Information Resources Incorporated; Houston, Texas). The Navajo Unit 02 of the Navajo Power Station in Coconino County, near Page, Arizona, is scheduled for an estimated $15 million, 8-week long outage in January 2004. The station is one of the largest coal-fired power plants in the West and plant consists of three 803 megawatt (MW) coal Combustion Engineering tangential-fired dry bottom boilers, with three General Electric turbine generators and associated equipment. The first unit came on line in 1974, the other two units in 1976.

Coal-fired stations generate more than half of the electricity produced nationally. The Navajo plant burns up to fourteen million tons of coal annually, which is transported by railroad from the stripmine of Black Mesa. The station uses approximately 28,000 acre-feet of water a year with a majority of its use to make up the water lost to evaporation from the six cooling towers at the site.

Scope for the outage includes: generator rewinds, replacing the economizer, rebuild of the tower crane plus inspections and repairs on turbine, boiler, and generator components. The generator rewind is contracted to General Electric (NYSE: GE) (Fairfield, Connecticut), one of the largest diversified companies in the U.S. Zachary Construction (San Antonio, Texas), an internationally known construction and industrial maintenance service company, will replace the economizer.

The Navajo Power Station is operated by Salt River Project (21.7%), U.S Bureau of Reclamation (24.3%), Los Angeles Dept. of Water & Power (21.2%), Arizona Public Service Company (14%), Nevada Power (11.3%), and Tucson Electric Power (7.5%).