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These sources of energy are also known as non renewable sources of energy and are available in limited quantity apart from hydro-electric power. Further, it can be classified under commercial and non-commercial energy

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Commercial: Coal, electricity and petroleum are known as commercial energy since the consumer needs to pay its price to buy them.

Non-commercial: Generally, the energy sources that are freely available are considered non-commercial energy sources. The examples of non-commercial energy sources are straw, dried dung, firewood.

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Today oil is considered to be liquid gold and one of the crucial sources of energy in India and the world. Oil is mostly used in planes, automobiles, trains and ships. It is mainly found in Assam, Gujarat and Mumbai.
The total production of oil in India was 0.3 million tons in 1950-51, which increased up to 32.4 million tons in 2000-01.

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Electricity is a common form of energy and used for domestic and commercial purposes. It is mainly utilized in electrical appliances like fridge, T.V, washing machine and air conditioning.
The major sources of power generation are mentioned below:
1, Nuclear Power
Thermal power is generated at various power stations by means of oil and coal.
2. Thermal Power
Hydroelectric power is produced by constructing dams above flowing rivers like Damodar Valley Project and Bhakra Nangal Project.
3. Hydro-electric power
The fuel used in nuclear power plants is Uranium, which costs less than coal.

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Coal is a combustible black or brownish-black sedimentary rock, formed as rock strata called coal seams. Coal is mostly carbon with variable amounts of other elements, chiefly hydrogen, sulphur, oxygen, and nitrogen. There are more than 148790 coal deposits in India. Between 2005-2006, the annual production went up to 343 million tons. India is the fourth-largest coal-producing country and the deposits are mostly found in Bihar, Orissa, Madhya Pradesh and Bengal.

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These non-conventional sources are also known as renewable sources of energy Examples include solar energy, bioenergy, tidal energy and wind energy.

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This is the energy that is produced by sunlight. The photovoltaic cells are exposed to sunlight based on the form of electricity that needs to be produced. The energy is utilized for cooking and distillation of water.

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Conventional :
1. The efficiency of the energy source is high
2. This energy source is a well-known source
3. The production expenses are low

Non-Conventional :
1. These sources of energy are environmentally friendly
2. They are inexhaustible
3. They are easy to operate

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The energy that is generated by exploiting the tidal waves of the sea is known as tidal energy. This source is yet to be tapped due to the lack of cost-effective technology.

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- Anirudh Chaturvedi
X-C

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This kind of energy is generated by harnessing the power of wind and mostly used in operating water pumps for irrigation purposes. India stands as the second-largest country in the generation of wind power.