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Biomass is actually one type of organic material which is made from microorganisms like plants, animals etc. Biomass is called the renewable source of energy because we can always grow trees and corps and other biological wastes. Carbon, Nitrogen and Oxygen are the three main and essential components of the biomass. Energy which is stored in plants by photosynthesis process is used in biomass as a source of energy. From biomass energy can be released by burning it. Like if we burn some logs then it releases its energy as heat. But burning biomass is not the single method to create energy; it can be utilized into transportation fuels like bio-diesel or ethanol too. Now days in USA about 4% of the energy is coming from biomass resources. To reduce the usage of fossil fuel from every aspect, scientists are expanding different paths of burning biomass and biofuels to reduce the pollution.

Fuels, which are made from biomass category materials, are called biofuels. Ethanol and biodiesels are example of biofuels. These kinds of fuels are actually blended with the fuels made of petroleum. Like ethanol is an alcohol fuel and it is made from grains, corns etc. and it is also blended with gasoline (they mix 10% of ethanol and 90% of gasoline). Bio-fuels can also be utilized on their own. Though biofuels are more less-expensive then fossil fuels but they are also pollution free from fossil fuels.

Scientists are now inventing carbon negative LIHD (Low Input High Diversity) biofuels form native grassland plants which can produce less greenhouse gases and provide more energy for transportation purpose.

There are a few advantages of Biofuel and Biomass and those are, we can get waste materials for free and by this we can save the use of fossil fuel and it tends to be low in cost etc.
Major Disadvantages of Biofuel and Biomass are we cannot get some of the waste materials for all over the year so it may be a problem to get biofuels in sufficient quantity.
Though nowadays researchers are making carbon negative biofuels these days but they still emit an amount of greenhouse gases.

Wind power: Here are a few words about wind power. It is clear from the name that the source of this energy is obviously wind. This form of power is also as much as important as solar energy. It is mainly produced in presence of wind with the help of wind turbines.it is one of the popular source of natural energy and the production of it does not costs a lump sum amount of money . Because of those 80 countries around the world is using this power as an alternative source of energy. Wind farms are all over the world now. Professor James Blyth, Charles F. Brush these are the remarkable names related this form of energy. Power storage is also a vital fact in this case too. But there are solutions also for this problem. Pumped-storage hydroelectricity also works for this source of energy too. These farms are mainly developed beside the sea or on the sea because of the high speed wind. Higher wind speed creates much power for this system. So most of them are built in the open land where wind can blow in high speed or on the sea or beside the sea.

Major Advantage of wind power is the source of the energy is unlimited and available almost all the time. The source is easily available. It is cost efficient. Initially costs a few bucks more than the others but after installation saves a lot of money.

Major Disadvantages of this source of energy, it is hard to maintain this form of system. It costs a lot of money in maintenance. The energy production is not same in every place.
Here are a few words about the wind power which is one of the most traditional alternative sources of energy after solar power.

As a hole around 2/3 portion of this Earth is covered with water, which is a source of renewable energy. From water we can create energy by using tidal or wave power. In some coastal areas, the difference in water level between high tide and low tide is as high as 6 to 8m. A portion of a river in such a region is blocked so that the water in this part of the river can be stored during the high tide. This stored water possesses potential energy. During low tide, the stored water is allowed to flow to lower level when the potential energy transforms into kinetic energy which rotates a water turbine set on the path of water flow. The rotating turbine generates electric energy is due to tidal power. To create energy form tidal power one time the infrastructure is built it is totally for free. It do not need any outsource energy to run the system and it is very cheap to maintain it. The location is the main problem for tidal power plants. There are only few places where tidal power plant can be executed. It can only generate adequate amount of energy for 8 to 10 hours maximum. Generally the ocean waves are mainly caused by winds. As the wind runs through the ocean the water also goes drifted with it with a high velocity and rotates the turbine which is placed there. By the rotation of the turbine it starts the generator connected with it and the generator from which we get electrical energy from wave power.

Major Advantages of this alternative source of energy is, it is totally for free, no external catalyst is needed and it does not need any maintenance. Wave power can create a massive amount of energy which is for free.

And the disadvantages are it creates a massive amount of noise pollution. It is not very much dependent source of energy. As it depends on waves so from time to time it creates great amount of energy and sometimes it creates so less amount of energy. The total infrastructure can have a breakdown in the time of natural disasters.

The word hydro means water; hydroelectricity is basically producing energy form the hydropower.
Hydroelectric power plants are mostly located in the valley type region where there is a big water level difference and a lake is situated. First a dam is made for storing the water. Inside the dam many small sized chambers are created .The chambers can be opened and closed time to time. In the bottom area of the dam turbines are placed. Now when the other side of the dam is filled up with water, this stored water contains potential energy stored in it. Now when the small chambers will open the water trapped in this part of the dam will move with a great velocity and force thorough the open gates of the chamber and hit the turbines fan strongly. Turbines will start rotating due to the force of the water. In the meantime the generator connected with the turbine will produce the required electrical power that we need.

This is the basic principal of who hydroelectricity is created. From the very beginning and still now countries all around the world basically depends upon this kind of hydroelectric power plants. Once the infrastructure is built for the hydroelectricity plants the out coming is great and it is very much dependable, used mostly as the source of alternative energy.

Major Advantages of Hydroelectricity are after the construction of hydroelectricity complex the energy is literally free of cost. A constant rate of electricity can be generated because the water can be restored in the dam and can be used to generate energy afterwards. The main fact of this type of power plant is that it is highly dependable and mostly used by all over the world. The hydroelectric power plants do not create any kind of waste or greenhouse gasses. It is almost pollution free.

Major Advantages of Hydroelectricity are it costs a lot of money to build the dam. If the dam gets broken by natural disaster then a large damage will be done to the nearby area.