Question

question 7 of 25
which of these is a disadvantage of hydroelectric energy?

a. has a long power-plant life span
b. is expensive to build or maintain
c. has high power-plant efficiency
d. reduces greenhouse gas emissions

Explanation:

To determine the disadvantage of hydroelectric energy, we analyze each option:

• Option A: A long power - plant life span is an advantage, not a disadvantage.
• Option B: Building and maintaining hydroelectric power plants is indeed expensive. This is a well - known disadvantage as the construction of dams, turbines, and related infrastructure requires a large amount of capital, and ongoing maintenance also incurs significant costs.
• Option C: High power - plant efficiency is an advantage, as it means that a large proportion of the potential energy of water is converted into electrical energy.
• Option D: Reducing greenhouse gas emissions is an environmental advantage of hydroelectric energy, as it produces less carbon dioxide and other greenhouse gases compared to fossil - fuel - based power generation.

Answer:

B. Is expensive to build or maintain