Alternative Energy: Definition, List, Types, Check Here


Alternative energy is that energy source which does not release any harmful gases on its use. It is a sources alternative to fossil fuel. Alternative energy is very much accepted energy it is controversial in nature.


There are many definitions of alternative energy. According to Oxford dictionary, “alternative energy is that sources of energy whose use does not cause any harm to the environment.” Alternative energy is basically used in place of renewable energy.

List of Alternative Energy:

  •  Geothermal energy:

    It means using energy from beneath the earth and is converted into electricity and other forms of energy.

  • Solar energy:

This is using sun rays and sunlight as a form of energy. A solar cooker, solar heater, solar panels etc. are the modes in which solar energy is used in day to day life.

  •  Hydro energy:

This energy is generated from falling water, by converting potential energy into kinetic energy. This energy is converted into electricity.

  •  wind energy:

Wind energy is using kinetic force to blowing wind through windmill to convert into electricity.

  • Nuclear energy:

Nuclear energy means using radioactive elements through the process of fission, to convert energy between protons and neutrons into any other form of energy.

  •  Biofuel and ethanol:

These are substitutes obtained from plants.

Hydrogen :


Hydrogen is most basic and omnipresent element in-universe. The byproducts of this are nothing but heat and pure water. Use of this energy doesn’t emit any harmful gases.

Is alternative energy sources are reliable or not?

Almost 75% of people believe that alternative energy is a good source of energy, but it is still a big debate. Alternative energy is that source of energy that can meet the rising demand of people. On the other side, the installation of alternative energy is very costly and becomes weather oriented.

List of a new source of alternative energy:

(i) Algae fuel:


This is fuel generated from algae. During photosynthesis, algae capture carbon dioxide and sunlight and convert it into oxygen and biomass. By this process algae create three forms of energy fuel:

biomass and

(ii) Biomass fuel:

This is mostly used in developing countries. It is used in place of charcoal and wood. Biogas fuel is obtaining methane and other gas by waste materials by processing them, this gas so produced can be used for producing electricity, for cooking and many other purposes.

(iii) Marine and hydrokinetic energy:


This process is also called marine energy. The devices used in this process are wave energy converter, tidal power turbines, ocean power turbines and ocean thermal energy.

(iv) Offshore wind:

These offshore wind farms are located on the ocean. With this process, we can harness the wind from the open sea. This type of energy source is mainly used in Europe and Asia.

(v) Biological hydrogen production:


Hydrogen gas is completely clean burning fuel. Its byproducts are only heat and pure water. In this process, biological vectors like algae and bacteria are mainly used. The only drawback is that this process requires a large amount of energy input to start, which makes this process inefficient.

(vi) Carbon – neutral and negative fuels:

Carbon-neutral fuels are synthetic fuels. These fuels are produced by hydro genetic waste carbon dioxide.


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