Sources of Energy

• Thermal
• Hydro
• Nuclear
• Other 

Thermal Power:

• Coal: Coal energy is one of the types of fossil fuels and non-renewable energy
• Oil: Oil is a natural substance 
• Natural Gas: Natural gas is present in the earth along with other natural resources like coal and oil.

Hydro electric Power:
Hydro-electricity is the production of electricity from the falling water

Nuclear Power:

Nuclear power is the production of electricity with the use of controlled nuclear reactions. Nuclear power provided about 2.1% total energy and 15% of electricity production.

Other Source of Energy:

• Wind: Wind power or wind energy falls in the category of renewable energy source. It can be used again and again without the fear of it being diminished or become scarce. 
• Solar: Sunlight reaches to earth in the form of photons which are energy packets that contain light in it.
• Geo-thermal: This energy is present into the earth due to the decay of minerals and absorption of sunlight by earth. 
• Tidal: The energy of the tides which is transformed into useful electricity and other power sources is known as tidal energy or tidal power. It is more efficient and reliable way of generating electricity as compared to wind mills and solar energy systems.
• Wave Power: When the power of the waves, present on the surface of the ocean, is used to convert it into useful form of energy it is known as wave power. Wave power is different from tidal power and ocean currents.