The U.S. electric system has 2.5 gigawatts of pumpedhydrostorage capacity, but most of the good, cheap sites are already occupied, and creating new reservoirs is not environmentally benign.
美国电力系统具备25亿瓦的泵送水电容量，但大部分优而廉的水库已被占用，而创建新水库并非对环境无害。
2
To demonstrate how much less infrastructure his system requires, Howe uses the example of the Bath County PumpedStoragehydro-electric dam in Virginia, US.
为了证明这个系统无需太多的基础设施，豪举例说明美国佛吉尼亚州巴斯县抽水蓄能水电大坝。
3
In design of pumpedstorage station or high water head hydro-power station, it is important to evaluate the rock infiltration properties under practical water pressure.