A
Balancing grid power demand by utilizing upper and lower reservoirs to store and generate electricity.
B
Desalinating seawater using excess grid frequency.
C
Acting as a primary fossil fuel substitute for thermal power plants without energy loss.
D
Providing chemical energy storage via lithium-ion electrochemical cells.
Correct answer: (a) Balancing grid power demand by utilizing upper and lower reservoirs to store and generate electricity.
Explanation
Option A correctly describes PSP as a hydroelectric energy storage system using upper and lower reservoirs to balance grid power demand. Option D refers to BESS (Battery Energy Storage Systems) rather than pumped storage hydrology.
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