Discussion
Pumped hydro storage stores energy as
Answer: D
Correct answer: the potential energy of raised water
Surplus electricity drives pumps that lift water from a lower reservoir to an upper one, and the energy is held as gravitational potential energy until the water is released back through turbines. The stored quantity is
\[ E = \rho g V h \]so it depends on the volume and the head, and nothing else. It remains by far the largest form of grid storage in service worldwide.
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