Development of the electricity generation system by the clean energy such as winds, waves and tides and so on increases its importance, and it is not possible to pass by avoiding for continuous economy to be developed in the 21th century.
　This note shows results of statistical analysis of coastal wind velocity and direction based on long-term observation, for the purpose of wind power plants construction. Wind data every 2 hours for four years between 1996 and 1999 at 28 Japanese coastal stations are introduced. Authors obtained these wind data by using the NOWPHS (NOWPHAS:Nationwide Ocean Wave information network for Ports and HArbourS) coastal wave observation data acquisition system.
　Following results are obtained from the analysis.
(1) Annual and seasonal averaged wind table and wind rose
(2) Efficiency for wind power plants in each observation stations
　Northern Japan Sea coastal stations such as Rumoi, Akita, and Sakata show good efficiency for the plant.