The energy generated by hydel projects constitutes only ___ of the total energy in the country.
A. 50 $\%$
B. 23 $\%$
C. 60 $\%$
D. 90 $\%$

Hint: The hydel energy is also known as hydroelectric energy or the hydropower which is generated from the sources of water. The energy is produced by the generators driven by the turbines with the free-flow of water stored at some height where stored water at height is the potential energy which is converted to mechanical energy and finally electric energy.

Step by step answer:Generally, the hydro-electric plant is constructed near dams which impound rivers or the areas with heavy rainfall and thereby raising height and forms the potential energy. Here, except the initial cost, the operating cost is very low.
Modernised power plants are very efficient and generate almost $90\% $ ninety percent of the electricity from the sources and it accounts for more than $18\% $ of the total world’s power generation capacity. The hydel projects constitute only $23\% $ of the total energy in the country.

Hence, from the given multiple choices – the option B is the correct answer.

Note: Hydro power plants can be classified as-
-Conventional Energy
-Non-conventional Energy
Huge dam or huge water reservoir is needed to construct the large hydro power plants. Sometimes, it restricts the natural flora and fauna and disturbs the whole ecosystem, and hence the large hydro power plants are the conventional source of energy.
Whereas, Mini and Micro hydro power plants are least effective to the natural environment and thus, considered to be the non-conventional source of energy.