据统计至1975年全世界已建成的水电站共有3.5亿千瓦,年发电量为1.42万亿度,约占世界可开发的水力能源的17%。其中,几个主要国家的水电装机容量:美国达6,628万千瓦;苏联达4,052万千瓦;加拿大达3,725万千瓦;日本达2,485万千瓦。过去建设水电站总是选择技术、经济条件好的地 It is estimated that a total of 350 million kilowatts of hydropower stations have been built in the world by 1975, with an annual generating capacity of 1.42 tera degrees, accounting for about 17% of the world’s hydropower potential. Among them, hydropower installed capacity in several major countries: 66.28 million kilowatts in the United States; 40.52 million kilowatts in the Soviet Union; 37.52 million kilowatts in Canada; and 24.85 million kilowatts in Japan. The construction of hydropower stations in the past always choose technology and economic conditions are good