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Reclamation working on turbine and generator rehab at Hoover powerplant

The U.S. Department of Interior’s Bureau of Reclamation is conducting rehabilitation of components of the turbines and generators at its 2,078-MW Hoover powerplant.

The Hoover hydropower plant is on the Colorado River between Nevada and Arizona in the U.S. The powerhouse contains 17 turbine-generator units.

According to data published on, Reclamation wants to repair/remanufacture, machine/rehabilitate existing hydro plant related components at the Hoover facility, such as the generator, turbine, elevators, cranes, water passages and gates, barricades and other components.

Each year, the Lower Colorado Dams Office performs a major maintenance overhaul “teardown” on one of its 17 hydro turbine-generator units, according to the original opportunity posted. Principal features of the work include:

  • Provide, weld and repair fatigued, worm or water-damaged hydro turbine-generator parts
  • Provide precision fabrication of new replacement parts
  • Provide reverse engineering to include three-dimensional digitizing and computer-aided repair or replacement manufacture of existing hardware
  • Provide industry standard inspection and testing
  • Self-perform machining work at the contractor’s facility or onsite
  • Assembly of turbine-generator parts from newly purchased components or components previously purchased and stocked at Hoover Dam

To advance this work, Reclamation awarded several contracts in late September, to Alstom Renewable US LLC, American Hydro Corporation, ANDRITZ Hydro Corp, and Unico Mechanical Corp.

Unico Mechanical reported it won a five-year indefinite delivery indefinite quantity contract. According to a press release, “Initial work for the Hoover Dam and hydropower plant will involve field repair, while future work will likely tap Unico’s extensive in-house machine shop capabilities for fabrication, welding and various machining requirements. In recent years, Unico Mechanical has seen an uptick in hydropower overhaul work.”