The correct answer is (c), hydro power.
Hydro power is the most important source of energy in Uttarakhand, accounting for over 60% of the state’s electricity generation. The state has a number of large hydropower plants, including the Tehri Dam, which is the largest hydroelectric dam in India. Hydropower is a clean and renewable source of energy, and it is well-suited to the mountainous terrain of Uttarakhand.
Thermal power is the second most important source of energy in Uttarakhand, accounting for about 30% of the state’s electricity generation. Thermal power plants use coal or natural gas to generate electricity. Thermal power is a non-renewable source of energy, and it is a major source of air pollution.
Natural gas is a fossil fuel that is used to generate electricity, heat homes and businesses, and power vehicles. Natural gas is a cleaner-burning fuel than coal or oil, and it is a relatively abundant resource. However, natural gas is still a non-renewable source of energy, and it is a major source of methane, a greenhouse gas that is more potent than carbon dioxide.
Geothermal power is a type of renewable energy that harnesses the heat from the Earth’s interior. Geothermal power is a clean and efficient source of energy, but it is not widely available. There are only a few geothermal power plants in the world, and they are located in areas with high geothermal potential.
In conclusion, the main source of energy in Uttarakhand is hydro power. Hydro power is a clean and renewable source of energy, and it is well-suited to the mountainous terrain of Uttarakhand.