Can the pumping and electricity production conditions of a pumped storage power plant be achieved at

The main purpose of a pumped storage power plant is to convert electrical energy into water potential energy when there is excess electrical energy. Because the output power of a power plant is generally constant, when the load is too low, the electrical energy. is wasted, and when the load is large, the electrical energy is not enough, resulting in undervoltage. At this time, the potential energy of the stored water is used to generate electricity to compensate for the insufficient power. Theoretically, energy storage and electricity generation can be done at the same time, but this makes no sense. There will be energy loss during energy storage or power generation, and the loss is very large.