Pumped storage is the process of using excess electricity as a liquid
energy medium during low grid periods to pump water from low lying reservoirs to
high lying reservoirs. During peak load periods, the water from high lying
reservoirs flows back to the lower reservoir to drive the turbine generator to
generate electricity, with a power generally controlled at 75%, commonly known
as 4 in and 3 out. It has daily scheduling capabilities and is used for peak
shaving and backup.
Disadvantages: Difficulty in site selection and its reliance on terrain;
The investment cycle is relatively long, with high losses, including pumping
losses and line losses; At present, it is also constrained by China's
electricity price policy. Last year, more than 80% of China's pumped storage was
exposed to the sun. In August of the same year, the National Development and
Reform Commission issued a policy on pumped storage electricity prices, which
may improve in the future, but it is definitely not a trend towards energy
storage.
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