Discussion
The need for storage grows with the penetration of wind and solar generation because their output is
Answer: B
Correct answer: variable and not dispatchable
Wind and solar output follows the weather rather than the operator’s instruction, so it cannot be called up when needed nor held back when not. The system must therefore absorb surpluses and cover shortfalls by other means, and as the share of such generation rises the size and duration of those excursions grow. Storage is how the energy is moved from when it is produced to when it is wanted.
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