Renewable energy sources are on everyone’s mind due to the fast depleting reserves of fossil fuel and the effects of global warming. We all want to go green and have environment friendly renewable energy sources.

Sun, wind, water, waste that is found all around can be used to create energy without depleting the source. They have potential to improve our environment as they don’t give off hazardous chemicals as their by-products. And above all these sources are free to use. We’ll discuss here what these renewable energy sources have to offer.

Sun is the most popular of the renewable energy sources. Collectors are used to create energy from the bright shinning sun-rays. They collect energy from the sun that can be used to create electricity. The amount may vary as the amount of sunlight varies due to change in weather.  

Renewable energy source also includes wind. Windmills are placed in the open places strategically to generate energy from the wind. The windmills convert the kinetic energy of the wind through the rotors to electricity.

Water is also used to create energy. There are huge water bodies in the universe and they can be used to create energy. Hydroelectricity is generated by using the kinetic energy of water. Water is forced to push the turbine which in turn powers the generator thus generating electricity.  However the hydropower is said to be one of the most expensive renewable energy sources and hence is not being used to its potential.

There is one renewable energy source that is gaining value and is really moving forward, that is biomass. This source uses all the wastes to create energy and in turn makes the environment clean. Common waste materials including trash, crops, wood and gases from the landfills are used to create energy.

Geothermal energy can also be a very good renewable energy source. This is a complicated process and involves going into the core of the earth. Also tidal energy can be created using the energy locked in the ocean waters due to tidal flow.

Use of renewable energy sources is vital for the future of our world. However due to the fact that renewable energy sources can be expensive to be used on a large scale often hampers the success.

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Rapidly developing countries such as China and India are the real main players in the climate debate, with the potential for massive increases in their carbon emissions in coming years. Brazil is often included in their number, yet this country is in fact notable for its exceptionally high reliance on energy from renewable sources — approaching 50%. However, the fact that much of this energy comes from hydropower and biofuels, and recent discoveries of massive oil … More >>

Energy in Brazil: Towards a Renewable Energy Dominated System

• ISBN13: 9780865715363
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The coming energy crisis caused by a peak in global oil and natural gas production will profoundly affect the lives of all North Americans. As the price of these vital fuels rises, homeowners will scramble to cut their fuel bills. Two options for meeting the upcoming challenge are dramatic improvements in home energy efficiency and efforts to tap into clean, affordable, renewable energy resources to heat and cool homes, to provide hot water and electricity, and even… More >>

The Homeowner’s Guide to Renewable Energy: Achieving Energy Independence through Solar, Wind, Biomass and Hydropower

Green energy refers to the use of power that is not only more efficient than fossil fuel but that is friendly to the environment as well. Green energy is generally defined as energy sources that dont pollute and are renewable.

There are several categories of green energy. They are anaerobic digestion, wind power, geothermal power, hydropower on a small scale, biomass power, solar power and wave power. Waste incineration can even be a source of green energy.

Nuclear power plants claim that they produce green energy as well, though this source is fraught with controversy, as we all know. While nuclear energy may be sustainable, may be considered renewable and does not pollute the atmosphere while it is producing energy, its waste does pollute the biosphere as it is released.

The transport, mining and phases before and after production of nuclear energy does produce and release carbon dioxide and similar destructive greenhouse gases. When we read of green energy, therefore, we rarely see nuclear power included.

Those who support nuclear energy say that nuclear waste is not, in fact, released into our earths biosphere during its normal production cycle. They stress as well that the carbon dioxide that nuclear energy production releases is comparable, in terms of each kilowatt hour of electricity, to such sources of green energy as wind power.

As an example of the green energy production the average wind turbine, such as the one in Reading England, can produce enough energy daily to be the only energy source for 1000 households.

Many countries now offer household and commercial consumers to opt for total use of green energy. They do this one of two ways. Consumers can buy their electricity from a company that only uses renewable green energy technology, or they can buy from their general supplies such as the local utility company who then buys from green energy resources only as much of a supply as consumers pay for.

The latter is generally a more cost – efficient way of supplying a home or office with green energy, as the supplier can reap the economic benefits of a mass purchase. Green energy generally costs more per kilowatt hour than standard fossil fuel energy.

Consumers can also purchase green energy certificates, which are alternately referred to as green tags or green certificates. These are available in both Europe and the United States, and are the most convenient method for the average consumer to support green energy. More than 35 million European households and one million American households now buy these green energy certificates.

While green energy is a great step in the direction of keeping our environment healthy and our air as pollutant free as possible, it must be noted that no matter what the energy, it will negatively impact the environment to some extent.

Every energy source, green or otherwise, requires energy. The production of this energy will create pollution during its manufacture. Green energys impact is minimal, however.

Approximately ten percent of energy produced in the United States is from hydropower. In this process, water spins in turbines in generators.

Hydropower is one of the renewable energy sources being researched and implemented to replace fossil fuels, which are in the process of depletion. It does not produce carbon dioxide, as coal power stations do, making it a cleaner, as well as, cheaper alternate way to produce electricity. It is also renewable, with the help of rainwater for replenishment.

The impoundment facility is the most common type of hydropower facilities. A dam is built on a large river or lake to store its water in a reservoir. When water is released from the reservoir through tunnels it flows through a turbine. Since the height of the water behind the walls is so great, the released water goes through the turbine with a great force of energy. As the turbine spins, it sets in motion a generator, which in turn produces electricity. The water then travels back into the stream or river below. Networks of transmission lines and facilities carry the electricity from the generator to users in a form they can use. The Hoover Dam is an illustration of the process just described. When it was initially built, it produced enough electricity for the entire city of Las Vegas. As Las Vegas grew, they turned to other energy sources

The pumped storage hydro plant facility is able to store power. It does so by pumping water from a lower reservoir to an upper reservoir during low energy demand periods. When needs increase, the water is released from the upper reservoir back to the lower reservoir for electricity generation.

Hydroelectric plants require a lot of land in order to build a dam and reservoir. This requires a great deal of money, time and construction. There are not many ideal places to put them and most of these have already been taken. The good thing is once constructed; the electricity is free to produce. Due to costs, the tendency will be to put up smaller hydro plants that are more economical.

Hydroelectric plants using dams have a negative effect on the environment. Through the construction of a dam, there is a blockage of the flow from upstream to downstream. This disrupts the migration pattern of fish. Fish can also be killed passing through the turbines. An advantage to hydropower is the ability to control energy release to meet changing demands.

The population is growing and so will its power needs. Fossil fuels are being used up and there will come a time when they will be depleted. We need to turn to renewable energy sources to meet our needs. Natural resources seem to be a natural solution. Hydroelectric plants can meet our power needs without worries of depletion or pollution. It is also the most reliable source available today. Research and development is ongoing to provide a solution to the damage a dam can do. The potential for hydroelectricity is within our grasp and we must find a way to make this work.