energy is an umbrella term that refers to any
source of usable energy intended to replace fuel sources without the
undesired consequences of the replaced fuels. Typically, official uses
of the term, such as qualification for governmental incentives, exclude
fossil fuels and nuclear energy whose undesired consequences are high
carbon dioxide emissions, the major contributing factor of global
warming according to the Intergovernmental Panel on Climate Change, and
difficulties of radioactive waste disposal.
Over the years, the nature of what was regarded alternative energy sources has changed considerably, and today because of the variety of energy choices and differing goals of their advocates, defining some energy types as "alternative" is highly controversial.
The term "alternative" presupposes a set of undesirable energy technologies against which "alternative energies" are opposed. As such, the list of energy technologies excluded is an indicator of what problems that the alternative technologies are intended to address. Controversies regarding dominant forms of energy and their alternatives have a long history.
There are many different forms in which alternative energy is available.
One of these is solar power. Solar power is driven by photovoltaic cells, and these are progressively getting less expensive and more advanced.
Solar energy power can be used for electricity, heating, and making hot water. Solar energy produces no pollution, as its input comes completely from the sun's rays. However, much more work still needs to be done in order for us to economically harness the sun's energy.
For the time being, the resource is a little too conditional - storage batteries are needed to be used as backups in the evenings and on inclement days.
Wind energy has become the most-invested-in (by private investors and governments together) alternative energy source for the time being. The great arrays of triple-bladed windmills are being placed all over as “wind farms”, to capture the motion of the wind and use its kinetic energy for conversion to mechanical or electrical energy.
Of course, there is nothing new about the concept of a windmill for harnessing energy. Modern wind turbines are simply are more advanced variations on the old theme.
Of course, the drawback to wind energy is...what do you do when there is a calm, still day?
Needless to say, during these times the electric company kicks in for powering your home or office. Wind energy is not altogether independent.
Hydroelectric energy is available as a source of alternative energy, and it can generate a substantial amount of power. Simply put, hydroelectric energy uses the motion of water - its flow in response to gravity, which means downhill - to turn turbines which then generate electrical energy.
Needless to say, water is ubiquitous; finding sources for driving hydroelectric turbines is, therefore, not much of a problem. However, hydroelectricity as a source of alternative energy can be complicated and expensive to produce.
Dams are often built in order to be able to control the flow of the water sufficiently to generate the needed power. Building a dam to store and control water's potential and kinetic energy takes quite a lot of work, and operating one is complex as well, and conservationists grow concerned that it.
Of course, a dam is not always needed if one is not trying to supply the electrical needs of a city or other very densely populated area. There are small run-of-river hydroelectric converters which are good for supplying neighbourhoods or an individual office or home.
Probably the most underrated and under-appreciated form of alternative energy is geothermal energy, which is simply the naturally-occurring energy produced by the heating of artesian waters that are just below the earth's crust.
This heat is transferred into the water from the earth's inner molten core. The water is drawn up by various different methods - there are “dry steam” power plants, “flash” power plants, and “binary” power plants for harnessing geothermal energy.
The purpose of drawing up the hot water is for the gathering of the steam. The Geysers, approximately 100 miles north of San Francisco, is probably the best-known of all geothermal power fields; it's an example of a dry stream plant.
More ArticlesDeveloping Nuclear Power As Alternative Energy
... rare occurrences, and the events of that nature which have taken place were the fault of outdated materials which should have been properly kept up. Indeed, if nuclear energy could become a more widely accepted form of alternative energy, there would be little question of their upkeep being maintained. ...
... decade or so the ranks of profession writers, as both individuals and as entire companies, have swelled. It is a profitable business and this can make it fraught with illegal actions and controversial claims. Nevertheless, each year there are many thousands of grants awarded throughout the United States ...
... development efforts into clean burning renewable energy sources, most prominently biofuels for ground vehicles. BP's investment comes to $50 million (US) per year over the course of the next decade. This EBI will be physically located at the University of Illinois Urbana-Champaign. The University is in ...
... and Switzerland have been furthering the cause of solar energy production by providing government subsidies or by giving tax breaks to companies and individuals who agree to utilize solar power for generating their heat or electrical power. As technology advances and a greater storage of solar collection ...
... extremely efficient energies like atomic energy are far less expensive than the continuous mining and drilling for fossil fuels. If we do not invest in our future now, catastrophe awaits us. We are going to need to consume more energy than ever in our history as we sail into the 21st century and beyond ...
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