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As a guide to wind power development, the U.S. Dept. of Energy defined a wind power scale in the Wind Energy Resource Atlas of the United States, published in 1986. A pdf copy is available at https://www.nrc.gov/docs/ML0609/ML060940383.pdf
| Wind Power Class |
At a height of 10 meters (33 ft) | Height of 50 meters (164 ft) | ||
|---|---|---|---|---|
| Wind Power Density (W/m²) |
Speed m/s (mph) |
Wind Power Density (W/m²) |
Speed m/s (mph) |
|
| 1 | 0 – 100 | 0 – 4.4 (9.8) | 0 – 200 | 0 – 5.6 (12.5) |
| 2 | 100 – 150 | 4.4 (9.8) – 5.1 (11.5) | 200 – 300 | 5.6 (12.5) - 6.4 (14.3) |
| 3 | 150 – 200 | 5.1 (11.5) – 5.6 (12.5) | 300 – 400 | 6.4 (14.3) – 7.0 (15.7) |
| 4 | 200 – 250 | 5.6 (12.5) – 6.0 (13.4) | 400 – 500 | 7.0 (15.7)– 7.5 (16.8) |
| 5 | 250 – 300 | 6.0 (13.4) – 6.4 (14.3) | 500 – 600 | 7.5 (16.8) – 8.0 (17.9) |
| 6 | 300 – 400 | 6.4 (14.3) – 7.0 (15.7) | 600 – 800 | 8.0 (17.9) – 8.8 (19.7) |
| 7 | 400 – 1000 | 7.0 (15.7) – 9.4 (21.1) | 800 – 2000 | 8.8 (19.7) – 11.9 (26.6) |
Commercial wind power development becomes feasible around wind power class 4.
A different set of classes was developed by the Massachusetts Technology Collaborative. In them, the wind is measured at a height of 65 meters. Class 1 is 5.5 - 6.0 m/s; the additional classes are defined at intervals of half a meter per second, ending at > 9.5 m/s.
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Last revised: 4 October 2005.