A
To maintain constant water pressure in municipal drinking water pipelines
B
To extract groundwater for agricultural irrigation using solar panels
C
To store off-peak electricity by moving water between lower and upper reservoirs
D
To pump untreated industrial wastewater into hydroelectric reservoirs
Correct answer: (c) To store off-peak electricity by moving water between lower and upper reservoirs
Explanation
A Pumped Storage Project (PSP) is a hydroelectric energy storage method that moves water between lower and upper reservoirs to store off-peak electricity and release it during peak demand. The other options incorrectly describe water treatment, municipal distribution, or agricultural irrigation.
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