Within two years, by 2023, ongoing drought in the Western U.S. could impact the ability of a major Arizona powerplant to supply electricity to millions of people across seven states, says the U.S. Bureau of Land Reclamation.

该预测是因为美国能源部的能源信息管理局指出,短期内干旱恶化能源前景预计,国内水电产量今年在2020年下降了14%,哥伦比亚河流域和其他几个州的下降12%,加利福尼亚州预计有49%的下降

The outlook from the bureau, part of the U.S. Interior Dept., shows the increasing likelihood over the next two years that water level in Lake Powell on the Arizona-Utah border could fall below what is needed for the 1.3 GW Glen Canyon Powerplant to generate electricity, the agency said Sept. 22

It anticipates there is a 3% chance that water in Lake Powell will drop below the minimum level needed to run the hydroelectric powerplant’s generators in 2022, and a 34% chance of that happening in 2023.

The plant, which includes eight generators inside the 710-ft-tall, 1,560-ft-long Glen Canyon Dam in northern Arizona, produces 5 billion kilowatt-hours of power each year, helping supply about 5.8 million utility customers in Arizona, Colorado, Nebraska, Nevada, New Mexico, Utah and Wyoming, according to the bureau.

鲍威尔湖, which was created by the dam, is the second-largest U.S. reservoir, holding more than 26 million acre-ft of water, a level reached in 1980.

但是,每年存储的实际水量可能会波动。2021年7月,流入湖泊的水减少了(本年度的预测,仅为平均金额的30%),使其水平达到了创纪录的低水平到那时到十二月之间去鲍威尔湖。

科罗拉多州盆地地区总监韦恩·普兰(Wayne Pullan)在一份声明中说:“鲍威尔湖的最新前景令人不安。”

Even with the extra water releases, the latest federal projections show the chances of Lake Powell dropping below the minimum level for powerplant operation remain elevated at 25% in 2024, 28% in 2025 and 34% in 2026.

西方电力协调委员会是一家非营利性公司,负责西方大部分地区的批量电力系统可靠性和安全性,他说,它进行了系统的充分性和系统稳定性计划研究,以帮助其成员计划任何重大问题。

动力装置并不是唯一的问题。

鲍威尔湖是科罗拉多河存储项目的一部分,该项目为农场和市政水提供了七个州的社区。水位下降也意味着更少的水可以释放到河流中。湖中的水从科罗拉多州流向米德湖,后面是胡佛水坝。

八月,局官员说,米德湖第一次面临水短缺,促使2022年的用水限制。

情况可能不会很快改善。最近的一份国家海洋和大气管理局干旱工作队报告发现,在2020年1月至2021年8月之间,西南部大部分地区的降水量低。并预测干旱至少将持续到2022年,并可能更长。

亚利桑那州水资源部主任汤姆·布斯查克(Tom Buschatzke)在一份声明中说,新的预测表明,除了目前的整个科罗拉多河系统的干旱应急计划之外,需要采取行动。