2011年,全国平均降水量556.8 mm,比常年偏少9%,为60年来最少,特别是南方部分省市出现了历史罕见的汛期抗旱现象。受此影响,全国重点水电厂来水总体偏枯,水电发电明显回落。据国家电网公司统计,全国水力发电量6 205亿kW·h,同比下降5.5%。分月看,1月份水电发电量同比增长36.6%,之后增速逐月回落,5月份出现同比下降,12月份同比下降6.1%。截至12月底,重点水电厂可调水量1168亿m~3,同比下降14.20%;蓄能值207亿 In 2011, the average rainfall in the country was 556.8 mm, 9% less than normal years and the fewest in 60 years. In particular, some provinces and cities in the southern part of the country experienced a history of rare drought-resistant flood season. Affected by this, the water supply to key hydropower plants in the country is generally dry and hydropower generation is obviously declining. According to statistics from State Grid Corporation of China, the country’s hydroelectric power generation is 6,205 billion kWh, a year-on-year decrease of 5.5%. In monthly terms, the hydroelectric power generation in January increased by 36.6% from a year earlier, after which the growth rate dropped month by month. In May, it showed a year-on-year decline, decreasing by 6.1% in December from a year earlier. As of the end of December, the key hydropower plant adjustable water 116.8 billion m ~ 3, down 14.20%; energy storage value of 20.7 billion