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Table 2 Classification of wind resource and extent of associated land areas

From: Wind energy potential and cost estimation of wind energy conversion systems (WECSs) for electricity generation in the eight selected locations of Tigray region (Ethiopia)

Wind resource category Wind class Wind power density (W/m2) Wind speed at 50 m (m/s) Total area (km2)
Poor 1 50–200 3.5–5.6 564,600
Marginal 2 200–300 5.6–6.4 96,801
Moderate 3 300–400 6.4–7.0 42,935
Good 4 400–500 7.0–7.5 23,975
Excellent 5 500–600 7.5–8.0 6529
Excellent 6 600–800 8.0–8.8 3814
Excellent 7 Above 800 Above 8.8 1715
Total area covered by poor-to-excellent wind regions 740,376