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With the ever-increasing penetration level of wind power, its impacts on power system reliability, power quality, economical efficiency and social welfare are becoming more and more significant mainly due to the uncertainty nature of the fluctuation and intermittence of wind. Thus, the relationships between fluctuation, intermittence and randomness are discussed. The causes and mathematical description of uncertain factors of wind power and the impacts on the acceptability of power frequency/voltage, stability and adequacy of power systems, power quality, electricity power market and emission reduction are concluded. Studying the problem in the generalized congestion framework of power systems is suggested. Also, the state-of-art and development of wind power uncertainties are reviewed. The solutions to cope with wind power uncertainties, as well as their optimization and coordination, are discussed through aspects of generation side, grid side and demand side. And also, the impacts caused by wind power uncertainties are considered in the three-defense-lines of power systems. The importance of quantitative analysis and risk-based decision-making are emphasized and suggested for further researches.© 2014 Chinese Society for Electrical Engineering.