TOEFL Reading Practice #9
Instruction: Read the passage below carefully and answer the questions that follow.
Passage: The Future of Renewable Energy Storage Technologies
As the world increasingly transitions toward renewable energy, the ability to store energy efficiently has become a critical factor in ensuring a stable power supply. Renewable energy sources like solar and wind are inherently intermittent, relying on weather patterns that cannot be controlled. This variability necessitates the development of advanced energy storage technologies.
Among the most promising solutions are lithium-ion batteries. Known for their high energy density and reliability, these batteries have already revolutionized industries such as electric vehicles. However, their widespread use in grid-scale energy storage faces challenges, including high costs, limited raw material availability, and concerns about environmental sustainability.
Other innovative storage technologies are also gaining traction. Flow batteries, for example, use liquid electrolytes to store energy and can last longer than traditional batteries. Similarly, hydrogen-based storage systems, which convert excess electricity into hydrogen for later use, offer a clean and versatile solution. Additionally, mechanical methods like pumped hydro storage and compressed air energy storage capitalize on gravitational and pressure-based energy retention.
Government policies and private investments play a significant role in advancing energy storage. Subsidies, tax incentives, and funding for research have spurred innovation and reduced costs in recent years. For instance, countries like Germany and South Korea have implemented ambitious energy storage initiatives to support their renewable energy goals.
Looking ahead, the future of renewable energy storage lies in diversification. No single solution is expected to meet all storage needs. Instead, a combination of technologies tailored to specific applications and regions will likely drive the transition to a more sustainable energy landscape.
1. What is the primary purpose of the passage?
2. According to the passage, what is a limitation of lithium-ion batteries?
3. What does the word “intermittent” in paragraph 1 most nearly mean?
4. How do flow batteries differ from lithium-ion batteries?
5. What role do government policies play in renewable energy storage?
6. What is the main advantage of hydrogen-based storage systems?
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