The correct answer is option 2: Geothermal energy.
Manikaran, located in Himachal Pradesh, is known for its geothermal energy resources. Geothermal energy is a form of renewable energy that is derived from the heat stored in the Earth`s crust. In Manikaran, there are natural hot water springs that are a result of the underground geothermal activity. These hot water springs are used to generate electricity and provide heating for various purposes.
Option 1: Solar energy is not the main feature of Manikaran. While there may be some solar energy installations in the area, they are not the primary focus.
Option 3: Bioenergy refers to energy derived from organic matter, such as plants or animals. There is no significant mention of bioenergy in relation to Manikaran.
Option 4: Wind energy is the conversion of wind flow into a useful energy source. Manikaran is not known for its wind energy resources.
Overall, the primary reason Manikaran is known is because of its geothermal energy resources, which contribute to its significance in the field of renewable energy.