Which of the following describes an advantage of hydroelectric power?

• A. Renewable, clean, low failure rates, available, flood control, domestic source of energy
• B. Expensive to build, high hazard, nutrient build up, low oxygen levels in the water
• C. Not available in most regions
• D. Produces no energy storage and no environmental impacts

Answer: (A)

Hydroelectric power uses the gravitational flow of water to spin turbines and generate electricity without burning fuel. Its main advantage is that it is renewable, clean, and has a low failure rate once built. The water cycle continually replenishes the source, so the energy is effectively limitless as long as water is available, and emissions during operation are minimal compared with fossil fuels. Dams and reservoirs also provide flood control by regulating downstream flow and storing water, and they can offer energy storage options through pumped-storage systems, which helps balance supply and demand. While building dams can be expensive and can cause environmental tradeoffs, the stated advantages highlight why hydro is prized as a domestic, reliable, low-pollution energy source. Other options describe drawbacks, regional limitations, or mischaracterize hydro’s storage and environmental impacts.