The U.S. electric system has 2.5 gigawatts of pumped hydro storage 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。
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"The owner also starts his cycling trips here whenever the guest house is not occupied, and there are some spare bikes in a storage room," they added.
The storage frame has the beneficial effects that the frame handle can rotate by 180 degrees, and the storage frame is convenient and practical and has convenient storage and little occupied space.