What advantage of tidal power is given over wind and solar? (Passage: Tidal power)
A proposed barrage across an estuary would generate electricity from the tide twice a day, with output predictable decades ahead, unlike wind or solar power. Its backers calculate that it could supply 5 per cent of national demand. Environmental groups object that the barrage would alter silt movement and could reduce the mudflats on which wading birds feed. The developers propose building artificial feeding areas elsewhere, but ecologists warn that there is no record of such replacements matching natural mudflats in supporting bird numbers.
Answer and explanation
Correct answer: A. Output can be predicted far in advance
- Step 1: Find the contrast with wind and solar. Step 2. The passage says tidal output is predictable decades ahead, unlike wind or solar. Answer: Output can be predicted far in advance. Why not the others: The other options are not stated.
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