Guangzhou Pumped Storage Power Station has a total capacity of 2,400MW and was developed in two stages. Hong Kong Pumped Storage Development Company, Limited (PSDC) is wholly-owned by CLP, which has contractual rights to use the equivalent of half of the first stage of the project (600MW).
This station uses hydro technology to store energy generated by other plants. Storage is achieved by pumping water from a lower to an upper reservoir. The stored energy can then be recovered by running the hydro units in reverse as generators, with their output available to the grid system at times of peak demand or as backup if other units shut down unexpectedly.
The pumped storage function also enables a nuclear plant to remain at full baseload operation despite fluctuations in system demand. Energy generated at Daya Bay, for example, can be used to pump water to the upper reservoir overnight, when system demand is low.
We use the contracted pumped storage capacity to support the operation and security of the Hong Kong electricity supply system.