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United States

Large American turbine unveiledI

Zond expects to install 25 -40 MW of its new Z-40 turbine by early next year in California. Negotiations are under way to install not less than 25 MW, says the company's senior vice president Bob Gates. The first turbines will go in the ground this autumn, and the project will be completed in the first quarter of 1995. Three projects are also being negotiated in the Midwest for a total of 100 MW to be started in the spring of 1995 and completed later in the year. Zond's goal is to install 75 MW in 1995. The turbine is the largest currently produced in the US.

Assembly of the machine will initially take place in Tehachapi. Two to three turbines will be put together each week, says Gates. In the future, they will be assembled elsewhere, perhaps even in the Upper Great Plains. "It's made in the US -- that's important to the US industry," says Gates. The three-bladed upwind turbine, unveiled at the Windpower '94 conference last month, is easy to maintain, says Gates. He points out that Zond has 12-13 years of field experience with nine models of turbines over more than ten years. The turbine's soft brake, although more expensive up front, should pay off over 15 years, says Gates. Airfoils are designed by the National Renewable Energy Laboratory, the drive-train is integrated, and the tower is lattice or tapered tubular. The blades are resistant to the effects of surface roughness degradation. The rotor design also uses both active and passive aerodynamic control for optimisation of power and torque, as well as for providing reliable and effective overspeed control in high winds.

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