Correct AnswerD. Pumped storage
Quick Explanation
Peak-load generation must start quickly and respond rapidly to large load changes. Pumped-storage hydro plants provide very fast start and ramping and can store off-peak energy for peak periods, making them highly suitable for peak-load service. Thus option D.
Detailed Explanation
Correct Answer
D — Pumped storage
Concept and Reasoning
Peak-load generation must start quickly and respond rapidly to large load changes. Pumped-storage hydro plants provide very fast start and ramping and can store off-peak energy for peak periods, making them highly suitable for peak-load service. Thus option D.
Calculation / Key Relation
Off-peak pumping → stored water → peak-period generation
Exam Takeaway
Pumped storage is both energy storage and fast peak generation.
Common Mistake
Base-load economics of nuclear/steam plants make them less suited to frequent peak cycling.
