There are many different types of renewable energy this article aims to highlight the main sources and methods available at present.

Biomass

What is biomass energy?

Biomass means all materials which come from living organisms. For instance, waste material of plants and animals, wood, agricultural wastes, dead parts of plants and animals. Since all living organisms contain carbon compounds, biomass has energy stored in the form of chemical compounds. The method of harnessing energy from each one of them could be different. Direct buring of these materials generally causes pollution but could be the cheapest from of energy. Eg. Using wood or dried cow dung cakes as fuel generates a lot of smoke. However, if cow dung is used in biogas plant, clean fuel can be generated. Mostly in villages, all types of biomas are traditionally burnt directly to produce heat. And if modern methods are used, they can be utilized properly.

Advantages of Biomass energy:

1. Its a renewable source of energy.

2. Its a comparatively lesser pollution generating energy.

3. Biomass energy helps in cleanliness in villages and cities.

Disadvantages of biomass energy:

1. Cost of construction of biogas plant is high, so only more wealthy people can gain acccess.

2. Continous supply of biomass is required to generate biomass energy.

3. Some people don't like to cook foood on biogas produced from sewage waste.

Solar

The Energy from our sunlight is the most affective and valuable source of energy we have on our planet by capturing solar energy through panels mounted in direct sunlight we can convert it into electricity.

It does depend however on how efficiently we can convert this energy and how much direct sunlight is offered to us, which are factors that effect arguments concerning whether or not solar is as useful as other means of power.

Assuming we are taking a reading at noon. 100 watts of solar energy per square foot can be captured in full sunlight. If we assume 12 hours of sun per day, this equates to 438,000 watt-hours per square foot per year. Based on 27,878,400 square feet per square mile, sunlight bestows a whopping 12.2 trillion watt-hours per square mile per year. Read more at - www.ecoworld.com.

Wind

Interestingly, wind is actually a form of solar energy, by uneven heating of our atmosphere, the obscure surface of the earth and its rotation. It's all down to the variables of our planet, it's vegetation cover, terrain and bodies of water. The Wind flow, or motion energy, when harvested by modern wind turbines can be used to generate electricity.

Wind turbines are traditionally located on-shore however recently there has been a tend to place them offshore. Wind energy installations range from large commercial wind farms to smaller developments, ideal for generating power for a household, farm or local community.

A single 2.5MW wind turbine can generate enough electricity to meet the annual needs of over 1,400 households, make 230 million cups of tea, or run the average computer for well over 2,000 years. 

Depending on local wind speeds, a turbine will generate electricity 70-85 per cent of the time. The combined output of uk wind farms however shows less variability, due to differences in wind speeds over the country as a whole.

Read More at www.renewableuk.com

Hydro-Electric

A hydroelectric power station converts kinetic, or movement energy in flowing water to electrical energy that can be used in homes and businesses. Hydro power can be generated on a small scale with a 'run of river' installation, which uses naturally flowing river water to turn one or more turbines, or on a large scale with a hydroelectric dam.

A hydroelectric dam straddles a river, blocking the waters progress downstream. Water collects on the upstream side of the dam, forming an artificial lake known as a reservoir. Damming the river converts the waters kinetic energy into potential energy: The reservoir becomes a sort of battery, storing energy that can be released a little at a time. As well as being a source of energy, some reservoirs are used as boating lakes or for drinking supplies Read more at www.edfenergy.com 

Tidal

Tidal energy is produced through the use of tidal energy generators. These large underwater turbines are placed in areas with high tidal movements, and are designed to capture the kinetic motion of the ebbing and surging of ocean tides in order to produce electricity. Tidal power has great potential for future power and electricity generation because of the massive size of the oceans. These articles explore the potential energy of tidal power technologies. Read more at www.alternative-energy-news.info

There are currently three different ways to get tidal energy: Tidal streams, barrages, and tidal lagoons.

A tidal stream is a fast flowing body of water created by tides. A turbine is a machine that takes energy from a flow of fluid. That fluid can be air or liquid. Because water is much more dense than air, tidal energy is more powerful than wind energy. Unlike wind, tides are predictable and stable. where tidal generators are used, they produce a steady, reliable stream of electricity.