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Difficulty: MediumIdentifying Main Ideas and Supporting Details

An environmental dispatch examines sustainable energy transitions in the Canary Islands:

On the remote volcanic island of El Hierro in Spain's Canary archipelago, municipal engineers have addressed the structural vulnerabilities of isolated island grids through an innovative hybrid infrastructure known as Gorona del Viento. By pairing a five-turbine wind farm directly with a pumped-storage hydroelectric facility installed inside a natural volcanic crater, the project resolves the core challenge of renewable intermittency. During periods of surplus wind generation, excess electrical power pumps desalinated water up to the elevated volcanic reservoir. When wind speeds subside, water descends through hydraulic turbines to generate electricity instantaneously, stabilizing the municipal grid without burning imported diesel. Although ongoing maintenance of the upper reservoir and ecological monitoring demand specialized technical oversight, the system has successfully supplied up to eighty percent of the island's annual electricity demand. Rather than treating clean generation as isolated technologies, the island's model demonstrates that pairing complementary production and storage systems is essential to securing reliable energy self-sufficiency in remote regions.

Which of the following best expresses the primary main idea of the passage?

  1. A
    Pumped-storage hydroelectric reservoirs built in volcanic craters require costly technical maintenance and environmental oversight to remain functional.
  2. Integrating complementary renewable generation with dynamic storage mechanisms enables remote regions to achieve dependable energy autonomy.Answer
  3. C
    The Gorona del Viento installation has completely eliminated all fossil fuel consumption across the entire Canary archipelago.
  4. D
    Standalone wind turbine farms are fundamentally incapable of providing clean electricity to municipal power networks.

Answer

Integrating complementary renewable generation with dynamic storage mechanisms enables remote regions to achieve dependable energy autonomy.
The correct answer accurately synthesizes the passage's primary argument: that combining renewable energy generation with energy storage allows isolated territories to overcome intermittency and attain dependable self-sufficiency.

Step-by-Step Solution

1
Analyze the passage structure and identify the core problem and solution presented.
The text discusses how El Hierro overcomes the intermittency of isolated wind power by coupling it with a pumped-storage hydroelectric system.
Identifying the central relationship between the problem (intermittency) and the solution (integrated storage) clarifies the main focus.
2
Evaluate the concluding synthesis where the author states the broader significance of the project.
The author concludes that 'pairing complementary production and storage systems is essential to securing reliable energy self-sufficiency in remote regions.'
Journalistic features typically synthesize their primary thesis in the concluding lines.
3
Distinguish the central thesis from supporting evidence and secondary caveats.
Details about reservoir maintenance and specific generation percentages support the broader argument that integrated systems deliver reliable energy autonomy.
Ensures the selected answer reflects the overarching main idea rather than a narrow supporting detail or exaggerated claim.

Key Concept

Identifying the central thesis in a journalistic analysis by synthesizing the core argument and distinguishing main ideas from supporting details and caveats.
Estimated Time:1m 30s
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Topics

Identifying Main Ideas and Supporting Details

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