TOEFL Reading Practice #15

Instruction: Read the passage below carefully and answer the questions that follow.

Passage: Renewable Energy Storage Technologies

As the world transitions toward renewable energy sources, the importance of effective energy storage technologies has grown significantly. Solar and wind power, two of the most popular renewable sources, are intermittent by nature—they produce energy only when the sun shines or the wind blows. To ensure a stable and reliable energy supply, advanced storage systems are essential.

Batteries, particularly lithium-ion batteries, have emerged as a leading solution. These batteries can store surplus energy generated during peak production hours and release it when demand increases. However, they face challenges such as limited lifespan, high cost, and environmental concerns related to mining raw materials.

Another promising technology is pumped hydro storage, which involves using surplus energy to pump water to a higher elevation. When energy demand peaks, the stored water is released to generate electricity through turbines. While efficient and scalable, this approach is limited by geographical constraints and high initial investment costs.

Researchers are also exploring innovative options like hydrogen energy storage and thermal storage systems. Hydrogen storage involves converting excess electricity into hydrogen gas, which can later be used to produce electricity. Thermal storage systems, on the other hand, store heat or cold energy that can be converted back into electricity or used for heating and cooling purposes.

The development of energy storage technologies is critical to overcoming the challenges of renewable energy. With continued advancements, these systems can ensure a sustainable and resilient energy future.

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