While renewable energy costs have declined precipitously, battery storage technology remains a critical _______ to round-the-clock grid reliability.
Answer and explanation
Correct answer: A. bottleneck
- Step 1: Identify the contrasting relationship introduced by "While". While generation costs have plummeted, energy storage still acts as a limiting factor or impediment to achieving continuous reliability.
- Step 2: In systems engineering and logistics, a "bottleneck" refers to a point of congestion or an obstacle that restricts the progress or capacity of a whole system.
Answer
bottleneck.
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