Table 30. Classes of Wind Power at Heights of 10 and 50 Meters

                                              Wind Power Density                                   Wind Power Density 
                        Wind Speed          (watts per square meter          Wind Speed          (watts per square meter 
Wind Power Class    (meters per second)      of rotor-swept area)        (meters per second)      of rotor-swept area)                
                                    10 Meters                                             50 Meters

 1................       0.0-4.4                      0-100                    0.0-5.6                      0-200
 2................       4.4-5.1                    100-150                    5.6-6.4                    200-300
 3................       5.1-5.6                    150-200                    6.4-7.0                    300-400
 4................       5.6-6.0                    200-250                    7.0-7.5                    400-500
 5................       6.0-6.4                    250-300                    7.5-8.0                    500-600
 6................       6.4-7.0                    300-400                    8.0-8.8                    600-800
 7................       7.0-9.4                  400-1,000                   8.8-11.9                  800-2,000


  Source: Pacific Northwest Laboratory, Wind Energy Resource Atlas of the United States, DE86004442 (Golden,
CO: Solar Energy Research Institute, October 1986), p. 3.


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