Conventional energy resources : 

These are the following :

•  Mineral coal :

Mineral coal is of four kinds- Anthracite, bituminous, lignite and peat. Among these, anthracite is the best kind of coal. Mineral coal is the relic of trees and vegetation which remained buried in the soil layers for millions of years. Burning of coal causes pollution.

•  Petroleum : 

It is the mixture of hydrocarbon compounds. High speed petrol, diesel and kerosene are obtained after refining of crude petroleum. 50% oil of the world is obtained from Gulf countries. In Gulf countries, Saudi Arabia, Iran, Iraq, Kuwait, U.A.E and Qatar are included. 

• Natural gas : 

These are hydrocarbon resources. It consists a major percentage of methane and inflammable gases. 

• Hydroelectricity : 

Moving turbines by quick stream of water, electricity is produced. It does not harm the atmosphere. In Rajasthan, hydro-electricity projects are established on the rivers Chambal and Mahi.

• Atomic electricity : 

It is obtained from Uranium. One kg uranium can produce the electricity equivalent to 25 lakh kg mineral oil.

Non-conventional energy resources : 

Due to regular exploitation of conventional resources and their depletion, research is being done to obtain non-conventional energy resources. 

The major resources of this category are : 

• Solar energy : 

The radiation obtained from the sun is called solar energy. The sun has unlimited energy stock. No other energy is so cheap and pollution-free as solar energy. 

•  Wind energy : 

It is also a pollution-less energy resource. In western Rajasthan, the speed of air remains 20 to 40 km/ hour. From it, 2500 KW electricity can be produced. 

•  Geothermal energy : 

At many places at the depth of 3 to 15 km, very hot rocks are found where hot water sources are found. The use of this geothermal heat is made to produce electricity by revolving the turbine by steam. 

• Bio gas : 

Bio gas is made by decomposing animal dung and other vegetative waste materials. 50 to 60 % methane is found in it. This gas is used for cooking, lighting, etc.