An alternative energy resource, gaining much market share, is solar power. It is the one that is most well known every day. This involves the manufacturing of solar cells which gather and focus the sun's energy, and translate it into electricity. In some, hot water can be produced from the sun. As with wind energy, solar energy creates absolutely zero pollution.

One of these renewable energy resources is solar energy. Solar PV cells continue to be manufactured that are often more energy efficient and less costly than previous models from a few years ago. Solar energy plants have been developed in in many nations. They are now more strategically placed in order to improve the national electricity grid. Over time, they are not causing environmental issues as previous placement of solar panels may have caused.

The following sections provide a summary overview of many other renewable energy sources being researched, developed, and deployed throughout the world.

Ocean current energy is discussed by governments and investors as having untapped energy generating potential. A ocean electricity generator in Europe has been in operation for a long time. It is thought to be a great accomplishment. The Irish and Scots are also running pilot facilities.

Hydroelectric power has been with us for a while. At current hydro dams, it is a clean generator of electricity. Because water and gravity is used, it is more effecient than a grid powered by natural gas. There are restrictions to the availability of the right places to set up a large dam. Many river based, or small and localized, hydro generators where created in recently due to this limitation.

Geothermal energy is extremely abundant. Since it lies directly beneath us, we only need drill just a few miles below the earth's surface to find huge amounts of energy. This energy is produced by the heating of water, trapped in layers of rock, through the earth's hot molten core. The water turns to steam, which is then used to drive turbines that generate electricity. Great amounts of research and development should be put into geothermal energy tapping.

Biodiesel energy is created out of the oils contained in plants. Most commonly, the retail stockpiles of bio-diesel have been created using rapeseed and sunflower oils. At the time of this writing, biodiesel is typically produced by agricultural corporations or those who want to experiment with renewable energy. Venture interest from companies across the World is on the rise. It burns much better than fossil fuel diesel.

Another renewable energy resource is solar generated electricity. Solar PV cells continue to be manufactured that are often more energy efficient and less costly than previous models from a few years ago. This involves the manufacturing of solar panels which gather and focus the sun's energy, and translate it into electricity. In other cases, hot water can be produced from the sun. As with wind energy, solar energy creates absolutely zero pollution.

Daniel Stouffer
http://www.articlesbase.com/home-and-family-articles/alternative-green-or-renewable-energy-technologies-711054.html

Is Microgeneration the new clean revolution?
by Tal Potishman

Microgeneration is likely to be an important step towards the Millennium Goal of ensuring environmental sustainability by the year 2015. This is an ambitious, if not idealistic, target which has been well-received by most - less so as an individual burden, and more of a sub-national one. "Let the government do something about it," is the response of many. Although many argue the benefits of this concept, there are only a few that have actually taken a proactive approach as individuals or private businesses.

Great Britain, in particular, has come under direct criticism for not doing enough to reduce its carbon footprint on our increasingly delicate atmosphere. And if governments cannot be counted on to set in motion a plan to ensure ecological sustainability, how can we, as individuals, be expected to do so?

Over the past two years, the UK has taken various steps to catch up with the rest of Europe in the race to reach the ambitious millennium target by 2015, in particular by setting up a Microgeneration Strategy. This aims to offer Zero- and Low- Carbon solutions for domestic homes, businesses, and communities, with specific targets that demand that by 2016 all new homes in the UK should be zero-carbon, whereas the same applies to non-domestic buildings by 2019. While that's a few years later than the Millennium goals dictate, it is definitely a start as the UK is taking the first step in a new direction.

But what exactly does microgeneration do? Microgeneration involves the producing of energy through small-scale energy generators such wind turbines and solar photo voltaic electricity generating panels. It means that in the future, all buildings will be equipped with these small generators, allowing them to produce and supply their own energy, and in the process, reducing the mass impact that big energy generators have on the environment today.

What is more, microgenerators are particularly beneficial for particular types of homes, such as those with no access to a central gas network. This newly acquired self-sufficiency of future households, communities, and businesses would make them less dependent on large industrial power plants. The Guardian argues that Microgeneration might even be a rival to nuclear energy. We need to ask ourselves whether these advantages are enough to encourage people to make their own contributions to helping preserve the planet for their great-grandchildren.

Like any new method, Microgeneration does have its hurdles that need to be assessed and overtaken. For one, it is not suitable for all types of homes. It is, for example, not readily available for local shops, nor is it easy to find many who are specialized in installing these microgenerators. Affordability is also a problem for many, reaffirming the old argument that ecological sustainability is only attainable by those who can afford it.

So is microgeneration the best way forward? Energy Minister Malcolm Wicks, among others, agree that it is. With the proper government support schemes in place, such as grants as well as more information regarding the pros and cons of microgeneration, more people will be ready to embrace it. It has the potential to have a massive impact on the reduction of CO2 emissions, so the more accessible microgeneration is made to the British public, the more individuals can do to reduce their ecological footprint. For now, it's back to recycling for most of us until we can afford to produce our own energy.

Tal Potishman
http://www.articlesbase.com/bath-showers-articles/microgeneration-in-the-uk-evaluation-and-background-629387.html

INTRODUCTION

The principles for using nuclear power to produce electricity are the same for most types of reactor. The energy released from continuous fission of the atoms of the fuel is harnessed as heat in either a gas or water, and is used to produce steam. The steam is used to drive the turbines which produce electricity (as in most fossil fuel plants). If graphite or heavy water is used as moderator, it is possible to run a power reactor on natural instead of enriched uranium. Natural uranium has the same elemental composition as when it was mined (0.7% U-235, over 99.2% U-238), enriched uranium has had the proportion of the fissile isotope (U-235) increased by a process called enrichment, commonly to 3.5 - 5.0%. In this case the moderator can be ordinary water, and such reactors are collectively called light water reactors. Because the light water absorbs neutrons as well as slowing them, it is less efficient as a moderator than heavy water or graphite.

Practically all fuel is ceramic uranium oxide (UO2 with a melting point of 2800°C) and most is enriched. The fuel pellets (usually about 1 cm diameter and 1.5 cm long) are typically arranged in a long zirconium alloy (zircaloy) tube to form a fuel rod, the zirconium being hard, corrosion-resistant and permeable to neutrons.* Numerous rods form a fuel assembly, which is an open lattice and can be lifted into and out of the reactor core. In the most common reactors these are about 3.5 to 4 metres long.

Zirconium is an important mineral for nuclear power, where it finds its main use. It is therefore subject to controls on trading. It is normally contaminated with hafnium, a neutron absorber, so very pure 'nuclear grade' Zr is used to make the zircaloy, which is about 98% Zr plus tin, iron, chromium and sometimes nickel to enhance its strength. 

Burnable poisons are often used (especially in BWR) in fuel or coolant to even out the performance of the reactor over time from fresh fuel being loaded to refuelling. These are neutron absorbers which decay under neutron exposure, compensating for the progressive build up of neutron absorbers in the fuel as it is burned. The best known is gadolinium, which is a vital ingredient of fuel in naval reactors where installing fresh fuel is very inconvenient, so reactors are designed to run more than a decade between refuellings.

Pressurised Water Reactor (PWR)

This is the most common type, with over 230 in use for power generation and a further several hundred in naval propulsion. The design originated as a submarine power plant. It uses ordinary water as both coolant and moderator. The design is distinguished by having a primary cooling circuit which flows through the core of the reactor under very high pressure, and a secondary circuit in which steam is generated to drive the turbine.

A PWR has fuel assemblies of 200-300 rods each, arranged vertically in the core, and a large reactor would have about 150-250 fuel assemblies with 80-100 tonnes of uranium.

Water in the reactor core reaches about 325°C, hence it must be kept under about 150 times atmospheric pressure to prevent it boiling. Pressure is maintained by steam in a pressuriser (see diagram). In the primary cooling circuit the water is also the moderator, and if any of it turned to steam the fission reaction would slow down. This negative feedback effect is one of the safety features of the type. The secondary shutdown system involves adding boron to the primary circuit.

The secondary circuit is under less pressure and the water here boils in the heat exchangers which are thus steam generators. The steam drives the turbine to produce electricity, and is then condensed and returned to the heat exchangers in contact with the primary circuit.

Boiling Water Reactor (BWR)

This design (diagram next page) has many similarities to the PWR, except that there is only a single circuit in which the water is at lower pressure (about 75 times atmospheric pressure) so that it boils in the core at about 285°C. The reactor is designed to operate with 12-15% of the water in the top part of the core as steam, and hence with less moderating effect and thus efficiency there.

The steam passes through drier plates (steam separators) above the core and then directly to the turbines, which are thus part of the reactor circuit. Since the water around the core of a reactor is always contaminated with traces of radio nuclides, it means that the turbine must be shielded and radiological protection provided during maintenance. The cost of this tends to balance the savings due to the simpler design. Most of the radioactivity in the water is very short-lived*, so the turbine hall can be entered soon after the reactor is shut down.

 mostly N-16, with a 7 second half-life

A BWR fuel assembly comprises 90-100 fuel rods, and there are up to 750 assemblies in a reactor core, holding up to 140 tonnes of uranium. The secondary control system involves restricting water flow through the core so that steam in the top part means moderation is reduced.

Pressurized Heavy Water Reactor (PHWR or CANDU)

The CANDU reactor design has been developed since the 1950s in Canada. It uses natural uranium (0.7% U-235) oxide as fuel, hence needs a more efficient moderator, in this case heavy water (D2O).**

 with the CANDU system, the moderator is enriched (ie water) rather than the fuel, - a cost trade-off.

The moderator is in a large tank called a calandria, penetrated by several hundred horizontal pressure tubes which form channels for the fuel, cooled by a flow of heavy water under high pressure in the primary cooling circuit, reaching 290°C. As in the PWR, the primary coolant generates steam in a secondary circuit to drive the turbines. The pressure tube design means that the reactor can be refuelled progressively without shutting down, by isolating individual pressure tubes from the cooling circuit.

A CANDU fuel assembly consists of a bundle of 37 half metre long fuel rods (ceramic fuel pellets in zircaloy tubes) plus a support structure, with 12 bundles lying end to end in a fuel channel. Control rods penetrate the calandria vertically, and a secondary shutdown system involves adding gadolinium to the moderator. The heavy water moderator circulating through the body of the calandria vessel also yields some heat (though this circuit is not shown on the diagram above).

Advanced Gas-cooled Reactor (AGR)

These are the second generation of British gas-cooled reactors, using graphite moderator and carbon dioxide as coolant. The fuel is uranium oxide pellets, enriched to 2.5-3.5%, in stainless steel tubes. The carbon dioxide circulates through the core, reaching 650°C and then past steam generator tubes outside it, but still inside the concrete and steel pressure vessel. Control rods penetrate the moderator and a secondary shutdown system involves injecting nitrogen to the coolant.

The AGR was developed from the Magnox reactor, also graphite moderated and CO2 cooled, and a number of these are still operating in UK. They use natural uranium fuel in metal form.

Light water graphite-moderated reactor

This is a Soviet design, developed from plutonium production reactors. It employs long (7 metre) vertical pressure tubes running through graphite moderator, and is cooled by water, which is allowed to boil in the core at 290°C, much as in a BWR. Fuel is low-enriched uranium oxide made up into fuel assemblies 3.5 metres long. With moderation largely due to the fixed graphite, excess boiling simply reduces the cooling and neutron absorbtion without inhibiting the fission reaction, and a positive feedback problem can arise.

Advanced reactors

Several generations of reactors are commonly distinguished. Generation I reactors were developed in 1950-60s and very few are still running today. They mostly used natural uranium fuel and used graphite as moderator. Generation II reactors are typified by the present US fleet and most in operation elsewhere. They typically use enriched uranium fuel and are mostly cooled and moderated by water. Generation III are the Advanced Reactors, the first few of which are in operation in Japan and others are under construction and ready to be ordered. They are developments of the second generation with enhanced safety.

Generation IV designs are still on the drawing board and will not be operational before 2020 at the earliest, probably later. They will tend to have closed fuel cycles and burn the long-lived actinides now forming part of spent fuel, so that fission products are the only high-level waste. Many will be fast neutron reactors.

More than a dozen (Generation III) designs are in various stages of development. Some are evolutionary from the PWR, BWR and CANDU designs above, some are more radical departures. The former include the Advanced Boiling Water Reactor, a few of which are now operating with others under construction. The best-known radical new design is the Pebble Bed Modular Reactor, using helium as coolant, at very high temperature, to drive a turbine directly.

Considering the closed fuel cycle, Generation 1-3 reactors recycle plutonium (and possibly uranium), while Generation IV are expected to have full actinide recycle.

Fast neutron reactors 

Some reactors (only one in commercial service) do not have a moderator and utilise fast neutrons, generating power from plutonium while making more of it from the U-238 isotope in or around the fuel. While they get more than 60 times as much energy from the original uranium compared with the normal reactors, they are expensive to build and await resource scarcity to come into their own.

Lifetime of nuclear reactors. 

Most of today's nuclear plants which were originally designed for 30 or 40-year operating lives.  However, with major investments in systems, structures and components lives can be extended, and in several countries there are active programs to extend operating lives.  In the USA most of the more than one hundred reactors are expected to be granted licence extensions from 40 to 60 years.  This justifies significant capital expenditure in upgrading systems and components, including building in extra performance margins.

Some components simply wear out, corrode or degrade to a low level of efficiency.  These need to be replaced.  Steam generators are the most prominent and expensive of these, and many have been replaced after about 30 years where the reactor otherwise has the prospect of running for 60 years.  This is essentially an economic decision.  Lesser components are more straightforward to replace as they age.  In Candu reactors, pressure tube replacement has been undertaken on some plants after about 30 years operation.

A second issue is that of obsolescence.  For instance, older reactors have analogue instrument and control systems.  Thirdly, the properties of materials may degrade with age, particularly with heat and neutron irradiation.  In respect to all these aspects, investment is needed to maintain reliability and safety.  Also, periodic safety reviews are undertaken on older plants in line with international safety conventions and principles to ensure that safety margins are maintained.

Floating nuclear power plants

Apart from over 200 nuclear reactors powering various kinds of ships, Rosatom in Russia has set up a subsidiary to supply floating nuclear power plants ranging in size from 70 to 600 MWe. These will be mounted in pairson a large barge, which will be permanently moored where it is needed to supply power and possibly some desalination to a shore settlement or industrial complex. The first will have two 40 MWe reactors based on those in icebreakers and will operate at Severodvinsk, in the Archangel region. Five of the next seven will be used by Gazprom for offshore oil and gas field development and for operations on the Kola and Yamal peninsulas. One is for Pevek on the Chukotka peninsula, another for Kamchatka region, both in the far east of the country. Further far east sites being considered are Yakutia and Taimyr. Electricity cost is expected to be much lower than from present alternatives.

The Russian KLT-40S is a reactor well proven in icebreakers and now proposed for wider use in desalination and, on barges, for remote area power supply. Here a 150 MWt unit produces 35 MWe (gross) as well as up to 35 MW of heat for desalination or district heating. These are designed to run 3-4 years between refuelling and it is envisaged that they will be operated in pairs to allow for outages, with on-board refuelling capability and used fuel storage. At the end of a 12-year operating cycle the whole plant is taken to a central facility for overhaul and removal of used fuel. Two units will be mounted on a 20,000 tonne barge. A larger Russian factory-built and barge-mounted reactor is the VBER-150, of 350 MW thermal, 110 MWe. The larger VBER-300 PWR is a 325 MWe unit, originally envisaged in pairs as a floating nuclear power plant, displacing 49,000 tonnes. As a cogeneration plant it is rated at 200 MWe and 1900 GJ/hr.

Primary coolants

The advent of some of the designs mentioned above provides opportunity to review the various primary coolants used in nuclear reactors:

Water or heavy water must be maintained at very high pressure (1000-2200 psi, 7-15 MPa) to enable it to function above 100°C, as in present reactors. This has a major influence on reactor engineering. However, supercritical water around 25 MPa can give 45% thermal efficiency - as at some fossil-fuel power plants today with outlet temperatures of 600°C, and at ultra supercritical levels (30+ MPa) 50% may be attained.

Helium must be used at similar pressure (1000-2000 psi, 7-14 MPa) to maintain sufficient density for efficient operation. Again, there are engineering implications, but it can be used in the Brayton cycle to drive a turbine directly.

Carbon dioxide was used in early British reactors and their AGRs. It is denser than helium and thus likely to give better thermal conversion efficiency. There is now interest in supercritical CO2 for the Brayton cycle.

Sodium, as normally used in fast neutron reactors, melts at 98°C and boils at 883°C at atmospheric pressure, so despite the need to keep it dry the engineering required to contain it is relatively modest. However, normally water/steam is used in the secondary circuit to drive a turbine (Rankine cycle) at lower thermal efficiency than the Brayton cycle.

Lead or lead-bismuth are capable of higher temperature operation. They are transparent to neutrons, aiding efficiency, and do not react with water. However, they are corrosive of fuel cladding and steels, and Pb-Bi yields Po activation products. Pb-Bi melts at 125°C and boils at 1670°C, Pb melts at 327°C and boils at 1737°C. In 1998 Russia declassified a lot of research information derived from its experience with submarine reactors, and US interest in using Pb/Pb-Bi for small reactors has increased subsequently.

Molten fluoride salt boils at 1400°C at atmospheric pressure, so allows several options for use of the heat, including using helium in a secondary Brayton cycle with thermal efficiencies of 48% at 750°C to 59% at 1000°C, or manufacture of hydrogen.

Low-pressure liquid coolants allow all their heat to be delivered at high temperatures, since the temperature drop in heat exchangers is less than with gas coolants. Also, with a good margin between operating and boiling temperatures, passive cooling for decay heat is readily achieved.

The removal of passive decay heat is a vital feature of primary cooling systems, beyond heat transfer to do work.  When the fission process stops, fission product decay continues and a substantial amount of heat is added to the core.  At the moment of shutdown, this is about 6% of the full power level, but it quickly drops to about 1% as the short-lived fission products decay.  This heat could melt the core of a light water reactor unless it is reliably dissipated.  Typically some kind of convection flow is relied upon. 

During this long reaction period about 5.4 tonnes of fission products as well as 1.5 tonnes of plutonium together with other transuranic elements were generated in the ore body. The initial radioactive products have long since decayed into stable elements but close study of the amount and location of these has shown that there was little movement of radioactive wastes during and after the nuclear reactions. Plutonium and the other transuranics remained immobile.

N.Sankari
http://www.articlesbase.com/technology-articles/a-methodological-analysis-and-blueprint-of-nuclear-reactor-698977.html

One of the biggest challenges the human race faces today is finding and using alternative energy sources. The push for means of generating electricity has been around for over 100 years, but when oil and coal-fired generators produced power inexpensively, the world put the search for alternative energy sources on the back burner for a number of years.

We cannot procrastinate any longer, however, as many of the earth's natural resources, such as oil, are depleting.

A Short History Lesson on Alternative Energy Sources

The need for an alternate energy source was rekindled in the 1970's with the oil shortage that created lines at gas stations and produced critical shortages throughout the United States. The search for alternate power generation is not limited to finding new ways of powering vehicles, as supplying cheap power for homes and industries is a continuous endeavor. There have been many advances in the search for alternative energy sources, but the price of the power produced still remains too high.

Wind, water and sun are touted as renewable energy resources with claims that once the technology is perfected, making it more cost effective, they can replace the need for oil and natural gas to turn turbines in the generation process. Even geothermal power production is one of the alternate energy sources being researched.

The Source Of The Energy Depends on The Location

For many people the switch to alternative energy sources is a matter of finding the type of alternative power that works the best in their particular geographical location. Persons who live in areas that have limited exposure to the sun for example, may not be too excited about using solar panels to supply power. When the sun goes down for an extended number of days, the town can go dark.

In some of those areas, wind is not a problem as it seems to blow nearly every day. Using wind power to turn turbines to generate electricity can work there, but may not work in other areas that experience less windy conditions. Another of the alternative energy sources, hydropower uses the power of rivers to turn generators, but the cost of the infrastructure to get power to the people from the generator may still be high for long range use.

With the three major alternative energy sources continuing to be researched and advanced, the need for an answer to out problem becomes more evident every time a person receives their electric bill, or fills their car with gas.

The resources that we have left on the planet are running out. Do your part to keep educated on the latest changes in technology and any up to date with the issues at hand to learn what you can do to help solve the energy crisis.

Madison Greene
http://www.articlesbase.com/environment-articles/the-importance-of-alternative-energy-sources-246959.html

Renewable energy

 

Renewable energy sources worldwide at the end of 2006.

Renewable energy is energy generated from natural resources—such as sunlight, wind, rain, tides, and geothermal heat — which are renewable (naturally replenished). In 2006, about 18% of global final energy consumption came from renewables, with 13% coming from traditional biomass, such as wood-burning.Hydroelectricity was the next largest renewable source, providing 3% (15% of global electricity generaiton), followed by solar hot water /heating, which contributed 1.3%. Modern technologies, such as geothermal energy, wind power, solar power and ocean energy together provided some 0.8% of final energy consumption.

Climate change concerns coupled with high oil prices, peak oil and increasing government support are driving increasing renewable energy legislation, incentives and commercialization.European Union leaders reached an agreement in principle in March 2007 that 20 percent of their nations' energy should be produced from renewable fuels by 2020, as part of its drive to cut emissions of carbon dioxide, blamed in part for global warming. Investment capital flowing into renewable energy climbed from $80 billion in 2005 to a record $100 billion in 2006.

In responce to the G8's call on the IEA for "guidance on how to achieve a clean, clever and competitive energy future", the IEA reported that the replacement of current technology with renewable energy could help reduce CO2 emmisions by 50% by 2050, which they claim is of crucial importance because current policies are not sustainable.

Wind power is growing at the rate of 30 percent annually, with a worldwide installed capacity of over 100 GW, and is widely used in several European countries and the United States. The manufacturing output of the photovoltaics industry reached more than 2,000 MW in 2006, and photovoltaic (PV) power stations are particularly popular in Germany. Solar thermal power stations operate in the USA and Spain, and the largest of these is the 354 MW SEGS power plant in the Mojave Desert. The world's largest geothermal power installation is The Gevsers in California, with a rated capacity of 750 MW. Brazil has one of the largest renewable energy programs in the world, involving production of ethanol fuel from sugar cane, and ethanol now provides 18 percent of the country's automotive fuel. Ethanol fuel is also widely available in the USA.

While there are many large-scale renewable energy projects and production, renewable technologies are also suited to small off-grid applications, sometimes in rural and remote areas, where energy is often crucial in human development. Kenya has the world's highest household solar ownership rate with roughly 30,000 small (20–100 watt) solar power systems sold per year.

Some renewable energy technologies are criticised for being intermittent or unsightly, yet the market is growing for many forms of renewable energy.

Main renewable energy technologies

Three energy sources

The majority of renewable energy technologies are directly or indirectly powered by the sun. The Earth-Atmosphere system is in equilibrium such that heat radiation into space is equal to incoming solar radiation, the resulting level of energy within the Earth-Atmosphere system can roughly be described as the Earth's "climate." The hydrosphere (water) absorbs a major fraction of the incoming radiation. Most radiation is absorbed at low latitudes around the equator, but this energy is dissipated around the globe in the form of winds and ocean currents. Wave motion may play a role in the process of transferring mechanical energy between the atmosphere and the ocean through wind stress. Solar energy is also responsible for the distribution of precipitation which is tapped by hydroelectric projects, and for the growth of plants used to create biofuels.

Renewable energy flows involve natural phenomena such as sunlight, wind, tides and geothermal heat, as the International Energy Agency explains:

"Renewable energy is derived from natural processes that are replenished constantly. In its various forms, it derives directly from the sun, or from heat generated deep within the earth. Included in the definition is electricity and heat generated from solar, wind, ocean, hydropower, biomass, geothermal resources, and biofuels and hydrogen derived from renewable resources.”

Each of these sources has unique characteristics which influence how and where they are used.

Wind power

 Vestas V80 wind turbines

Airflows can be used to run wind turbines. Modern wind turbines range from around 600 kW to 5 MW of rated power, although turbines with rated output of 1.5–3 MW have become the most common for commercial use; the power output of a turbine is a function of the cube of the wind speed, so as wind speed increases, power output increases dramatically. Areas where winds are stronger and more constant, such as offshore and high altitude sites, are preferred locations for wind farms.

Since wind speed is not constant, a wind farm’s annual energy production is never as much as the sum of the generator nameplate ratings multiplied by the total hours in a year. The ratio of actual productivity in a year to this theoretical maximum is called the capacity factor. Typical capacity factors are 20-40%, with values at the upper end of the range in particularly favourable sites. For example, a 1 megawatt turbine with a capacity factor of 35% will not produce 8,760 megawatt-hours in a year, but only 0.35x24x365 = 3,066 MWh, averaging to 0.35 MW. Online data is available for some locations and the capacity factor can be calculated from the yearly output.

Globally, the long-term technical potential of wind energy is believed to be five times total current global energy production, or 40 times current electricity demand. This could require large amounts of land to be used for wind turbines, particularly in areas of higher wind resources. Offshore resources experience mean wind speeds of ~90% greater than that of land, so offshore resources could contribute substantially more energy. This number could also increase with higher altitude ground-based or airborne wind turbines.

Wind power is renewable and produces no greenhouse gases during operation, such as carbon dioxdie and methane.

Water power

Energy in water (in the form of kinetic energy, temperature differences or salinity gradients) can be harnessed and used. Since water is about 800 times denser than air, even a slow flowing stream of water, or moderate sea swell, can yield considerable amounts of energy.

 

One of 3 PELAMIS P-750 Ocean Wave Power engines in the harbour of Peniche/ Portugal.

There are many forms of water energy:

·         Hydroelectric energy is a term usually reserved for large-scale hydroelectric dams. Examples are the Grand Coulee Dam in Washington State and the Akosombo Dam in Ghana.

·         Micro hydro systems are hydroelectric power installations that typically produce up to 100 kW of power. They are often used in water rich areas as a Remote Area Power Supply (RAPS). There are many of these installations around the world, including several delivering around 50 kW in the Solomon Islands.

·         Damless hydro systems derive kinetic energy from rivers and oceans without using a dam.

·         Ocean energy  describes all the technologies to harness energy from the ocean and the sea:

o   Marine current power. Similar to tidal stream power, uses the kinetic energy of marine currents

o   Ocean thermal energy  conversion (OTEC) uses the temperature difference between the warmer surface of the ocean and the colder lower recesses. To this end, it employs a cyclic heat engine. OTEC has not been field-tested on a large scale.

o   Tidal power captures energy from the tides. Two different principles for generating energy from the tides are used at the moment:

o   Tidal motion in the vertical direction — Tides come in, raise water levels in a basin, and tides roll out. Around low tide, the water in the basin is discharged through a turbine, exploiting the stored potential energy.

o   Tidal motion in the horizontal direction — Or tidal stream power. Using tidal stream generators, like wind turbines but then in a tidal stream. Due to the high density of water, about eight-hundred times the density of air, tidal currents can have a lot of kinetic energy. Several commercial prototypes have been build, and more are in development.

·         Wave power  uses the energy in waves. Wave power machines usually take the form of floating or neutrally buoyant structures which move relative to one another or to a fixed point. Wave power has now reached commercialization.

·         Saline gradient power,  or osmotic power, is the energy retrieved from the difference in the salt concentration between seawater and river water. Reverse electrodialysis (RED), and Pressure retarded osmosis (PRO) is in research and testing phase.

·         Deep lake water cooling,  although not technically an energy generation method, can save a lot of energy in summer. It uses submerged pipes as a heat sink for climate control systems. Lake-bottom water is a year-round local constant of about 4 °C.

Solar energy use

 

Monocrystalline solar cell

In this context, "solar energy" refers to energy that is collected from sunlight. Solar energy can be applied in many ways, including to:

•           Generate electricity by heating trapped air which rotates turbines in a Solar updraft tower.

•           Generate electricity in geosynchronous orbit using solar power satellites.

•           Generate electricity using photovoltaic solar cells.

•           Generate electricity using concentrated solar power.

•           Generate hydrogen using photoelectrochemical cells.

•           Heat and cool air through use of solar chimneys.

•           Heat buildings, directly, through passive solar building design.

•           Heat foodstuffs, through solar ovens.

•           Heat water or air for domestic hot water and space heating needs using solar-thermal panels.

•           Solar air conditioning

Biofuel

Plants use photosynthesis to grow and produce biomass. Also known as biomatter, biomass can be used directly as fuel or to produce liquid biofuel. Agriculturally produced biomass fuels, such as biodiesel, ethanol and bagasse (often a by-product of sugar cane cultivation) can be burned in internal combustion engines or boilers. Typically biofuel is burned to release its stored chemical energy. Research into more efficient methods of converting biofuels and other fuels into electricity utilizing fuel cells is an area of very active work.

Liquid biofuel

 

Information on pump, California.

Liquid biofuel is usually either a bioalcohol such as ethanol fuel or a bio-oil such as biodiesel and straight vegetable oil. Biodiesel can be used in modern diesel vehicles with little or no modification to the engine and can be made from waste and virgin vegetable and animal oil and fats (lipids). Virgin vegetable oils can be used in modified diesel engines. In fact the Diesel engine was originally designed to run on vegetable oil rather than fossil fuel. A major benefit of biodiesel is lower emissions. The use of biodiesel reduces emission of carbon monoxide and other hydrocarbons by 20 to 40%.

In some areas corn, cornstalks, sugarbeets, sugar cane, and switchgrasses are grown specifically to produce ethanol (also known as grain alcohol) a liquid which can be used in internal combustion engines and fuel cells. Ethanol is being phased into the current energy infrastructure. E85 is a fuel composed of 85% ethanol and 15% gasoline that is sold to consumers. Biobutanol is being developed as an alternative to bioethanol. There is growing international criticism about biofuels from food crops with respect to issues such as food security, environmental impacts (deforestation) and energy balance.

Solid biomass

 

Sugar cane  residue can be used as a biofuel

Solid biomass is mostly commonly usually used directly as a combustible fuel, producing 10-20 MJ/kg of heat.

Its forms and sources include wood fuel,  the biogenic portion of municipal solid waste, or the unused portion of field crops. Field crops may or may not be grown intentionally as an energy crop,  and the remaining plant byproduct used as a fuel. Most types of biomass contain energy. Even cow manure still contains two-thirds of the original energy consumed by the cow. Energy harvesting via a bioreactor is a cost-effective solution to the waste disposal issues faced by the dairy farmer, and can produce enough biogas to run a farm.

With current technology, it is not ideally suited for use as a transportation fuel. Most transportation vehicles require power sources with high power density, such as that provided by internal combustion engines. These engines generally require clean burning fuels, which are generally in liquid form, and to a lesser extent, compressed gaseous phase. Liquids are more portable because they have high energy density, and they can be pumped, which makes handling easier. This is why most transportation fuels are liquids.

Non-transportation applications can usually tolerate the low power-density of external combustion engines, that can run directly on less-expensive solid biomass fuel, for combined heat and power. One type of biomass is wood, which has been used for millennia in varying quantities, and more recently is finding increased use. Two billion people currently cook every day, and heat their homes in the winter by burning biomass, which is a major contributor to man-made climate change global warming. The black soot that is being carried from Asia to polar ice caps is causing them to melt faster in the summer. In the 19th century, wood-fired steam engines were common, contributing significantly to industrial revolution unhealthy air pollution. Coal is a form of biomass that has been compressed over millennia to produce a non-renewable, highly-polluting fossil fuel.

Wood and its byproducts can now be converted through process such as gasification into biofuels such as woodgas, biogas,  methanol or ethanol fuel; although further development may be required to make these methods affordable and practical. Sugar cane residue, wheat chaff, com cobs and other plant matter can be, and are, burned quite successfully. The net carbon dioxide emissions that are added to the atmosphere by this process are only from the fossil fuel that was consumed to plant, fertilize, harvest and transport the biomass.

Processes to harvest biomass from short-rotation poplars and willows, and perennial grasses such as switchgrass, phalaris, and miscanthus, require less frequent cultivation and less nitrogen than from typical annual crops. Pelletizing miscanthus and burning it to generate electricity is being studied and may be economically viable.

Biogas

Biogas can easily be produced from current waste streams, such as: paper production, sugar production, sewage, animal waste and so forth. These various waste streams have to be slurried together and allowed to naturally ferment, producing methane gas. This can be done by converting current sewage plants into biogas plants. When a biogas plant has extracted all the methane it can, the remains are sometimes better suitable as fertilizer than the original biomass.

Alternatively biogas can be produced via advanced waste processing systems such as mechanical biological treatment. These systems recover the recyclable elements of household waste and process the biodegradable fraction in anaerobic digesters.

Renewable natural gas is a biogas which has been upgraded to a quality similar to natural gas. By upgrading the quality to that of natural gas, it becomes possible to distribute the gas to the mass market via gas grid.

Geothermal energy

 

Krafla Geothermal Station in northeast Iceland

Geothermal energy is energy obtained by tapping the heat of the earth itself, usually from kilometers deep into the Earth's crust. It is expensive to build a power station but operating costs are low resulting in low energy costs for suitable sites. Ultimately, this energy derives from heat in the Earth’s core. The government of Iceland states: "It should be stressed that the geothermal resource is not strictly renewable in the same sense as the hydro resource." It estimates that Iceland's geothermal energy could provide 1700 MW for over 100 years, compared to the current production of 140 MW. Radioactive elements in the earth's crust continuously decay, replenishing the heat. The International Energy Agency classifies geothermal power as renewable.

Three types of power plants are used to generate power from geothermal energy: dry steam, flash, and binary. Dry steam plants take steam out of fractures in the ground and use it to directly drive a turbine that spins a generator. Flash plants take hot water, usually at temperatures over 200 °C, out of the ground, and allows it to boil as it rises to the surface then separates the steam phase in steam/water separators and then runs the steam through a turbine. In binary plants, the hot water flows through heat exchangers, boiling an organic fluid that spins the turbine. The condensed steam and remaining geothermal fluid from all three types of plants are injected back into the hot rock to pick up more heat.

The geothermal energy from the core of the Earth is closer to the surface in some areas than in others. Where hot underground steam or water can be tapped and brought to the surface it may be used to generate electricity. Such geothermal power sources exist in certain geologically unstable parts of the world such as Chile, Iceland, New Zealand, United States, the Philippines and Italy. The two most prominent areas for this in the United States are in the Yellowstone basin and in northern California. Iceland produced 170 MW geothermal power and heated 86% of all houses in the year 2000 through geothermal energy. Some 8000 MW of capacity is operational in total.

There is also the potential to generate geothermal energy from hot dry rocks. Holes at least 3 km deep are drilled into the earth. Some of these holes pump water into the earth, while other holes pump hot water out. The heat resource consists of hot underground radiogenic granite rocks, which heat up when there is enough sediment between the rock and the earths surface. Several companies in Australia are exploring this technology.

Renewable energy commercialization

Costs

Source                         2001 energy costs                              Potential future energy cost

Electricity

Wind                           4–8 ¢/kWh                                                      3–10 ¢/kWh

Solar photovoltaic       25–160 ¢/kWh                                                            5–25 ¢/kWh

Solar thermal               12–34 ¢/kWh                                                  4–20 ¢/kWh

Large hydropower      2–10 ¢/kWh                                                    2–10 ¢/kWh

Small hydropower       2–12 ¢/kWh                                                    2–10 ¢/kWh

Geothermal                 2–10 ¢/kWh                                                    1–8 ¢/kWh

Biomass                       3–12 ¢/kWh                                                    4–10 ¢/kWh

Coal (comparison)       4 ¢/kWh         

Heat

Geothermal Heat         0.5–5 ¢/kWh                                                   0.5–5 ¢/kWh

Biomass — heat          1–6 ¢/kWh                                                      1–5 ¢/kWh

Low Temp Solar Heat 2–25 ¢/kWh                                                    2–10 ¢/kWh

All costs are in 2001 US$-cent per kilowatt-hour.

New generation of solar thermal plants

The 11 megawatt PS10 solar power tower in Spain produces electricity from the sun using 624 large movable mirrors called heliostats.

Aerial view of one of the SEGS plants.

Since 2004 there has been renewed interest in solar thermal power stations and two plants were completed during 2006/2007: the 64 MW Nevada Solar One and the 11 MW PS10 solar power tower in Spain. Three 50 MW trough plants were under construction in Spain at the end of 2007 with 10 additional 50 MW plants planned. In the United States, utilities in California and Florida have announced plans (or contracted for) at least eight new projects totaling more than 2,000 MW.

In developing countries, three world bank projects for integrated CSP/combined-cycle gas-turbine power plants in Egypt, Mexico, and Morocco were approved during 2006/2007.

There are several solar thermal power plant in the Mojave Desert which supply power to the electricity grid. Solar Energy Generating Systems (SEGS) is the name given to nine solar power plants in the Mojave Desert which were built in the 1980s. These plants have a combined capacity of 354 MW making them the largest solar power installation in the world.

World's largest photovoltaic power plants

Several large photovoltaic power plants have been completed in Spain in 2008: the Parque Fotovoltaico Olmedilla de Alarcon (60 MW), Parque Solar Merida/Don Alvaro (30 MW), Planta solar Fuente Alamo (26 MW), Planta fotovoltaica de Lucainena de las Torres (23.2 MW), Parque Fotovoltaico Abertura Solar (23.1 MW), Parque Solar Hoya de Los Vincentes (23 MW), the Solarpark Calveron (21 MW), and the Planta Solar La Magascona (20 MW).

First Solar 40 MW PV Array installed by JUWI Group in Waldpolenz, Germany

Waldpolenz Solar Park, which will be the world’s largest thin-flim photovoltaic (PV) power system, is being built at a former military air base to the east of Leipzig in Germany. The power plant will be a 40-megawatt solar power system using state-of-the-art thin film technology, and should be finished by the end of 2009. 550,000 First Solar thin-film modules will be used, which will supply 40,000 MWh of electricity per year.

Topaz Solar Farm is a proposed 550 MW solar photovoltaic power plant which is to be built northwest of California Valley in the USA at a cost of over $1 billion. Built on 9.5 square miles (25 km2) of ranchland, the project would utilize thin-film PV panels designed and manufactured by OptiSolar in Hayward and Sacramento. The project would deliver approximately 1,100 gigawatt-hours (GWh) annually of renewable energy. The project is expected to begin construction in 2010, begin power delivery in 2011, and be fully operational by 2013.

High Plains Ranch  is a proposed 250 MW solar photovoltaic power plant which is to be built by Sun Power in the Carrizo Plain, northwest of California Valley.

However, when it comes to renewable energy systems and PV, it is not just large systems that matter. Building-Integrated Photovoltaics or "onsite" PV systems have the advantage of being matched to end use energy needs in terms of scale. So the energy is supplied close to where it is needed.

Environmental and social considerations

While most renewable energy sources do not produce pollution directly, the materials, industrial processes, and construction equipment used to create them may generate waste and pollution. Some renewable energy systems actually create environmental problems. For instance, older wind turbines can be hazardous to flying birds.

Land area required

Another environmental issue, particularly with biomass and biofuels, is the large amount of land required to harvest energy, which otherwise could be used for other purposes or left as undeveloped land. However, it should be pointed out that these fuels may reduce the need for harvesting non-renewable energy sources, such as vast strip-mined areas and slag mountains for coal, safety zones around nuclear plants, and hundreds of square miles being strip-mined for oil sands. These responses, however, do not account for the extremely high biodiversity and endemism of land used for ethanol crops, particularly sugar cane.

In the U.S., crops grown for biofuels are the most land- and water-intensive of the renewable energy sources. In 2005, about 12% of the nation’s corn crop (covering 11 million acres (45,000 km²) of farmland) was used to produce four billion gallons of ethanol—which equates to about 2% of annual U.S. gasoline consumption. For biofuels to make a much larger contribution to the energy economy, the industry will have to accelerate the development of new feedstocks, agricultural practices, and technologies that are more land and water efficient. Already, the efficiency of biofuels production has increased significantly and there are new methods to boost biofuel production.

Hydroelectric dams

The major advantage of hydroelectric systems is the elimination of the cost of fuel. Other advantages include longer life than fuel-fired generation, low operating costs, and the provision of facilities for water sports. Operation of pumped-storage plants improves the daily load factor of the generation system. Overall, hydroelectric power can be far less expensive than electricity generated from fossil fuels or nuclear energy, and areas with abundant hydroelectric power attract industry.

However, there are several major disadvantages of hydroelectric systems. These include: dislocation of people living where the reservoirs are planned, release of significant amounts of carbon dioxide at construction and flooding of the reservoir, disruption of aquatic ecosystems and birdlife, adverse impacts on the river environment, potential risks of sabotage and terrorism, and in rare cases catastrophic failure of the dam wall.

Hydroelectric power is now more difficult to site in developed nations because most major sites within these nations are either already being exploited or may be unavailable for other reasons such as environmental considerations.

Wind farms

Wind power  is one of the most environmentally friendly sources of renewable energy

A wind farm, when installed on agricultural land, has one of the lowest environmental impacts of all energy sources:

•           It occupies less land area per kilowatt-hour (kWh) of electricity generated than any other energy conversion system, apart from rooftop solar energy, and is compatible with grazing and crops.

•           It generates the energy used in its construction in just 3 months of operation, yet its operational lifetime is 20–25 years.

•           Greenhouse gas emissions and air pollution produced by its construction are tiny and declining. There are no emissions or pollution produced by its operation.

•           In substituting for base-load coal power, wind power produces a net decrease in greenhouse gas emissions and air pollution, and a net increase in biodiversity.

•           Modern wind turbines are almost silent and rotate so slowly (in terms of revolutions per minute) that they are rarely a hazard to birds.

Studies of birds and offshore wind farms in Europe have found that there are very few bird collisions. Several offshore wind sites in Europe have been in areas heavily used by seabirds. Improvements in wind turbine design, including a much slower rate of rotation of the blades and a smooth tower base instead of perchable lattice towers, have helped reduce bird mortality at wind farms around the world. However older smaller wind turbines may be hazardous to flying birds. Birds are severely impacted by fossil fuel energy; examples include birds dying from exposure to oil spills, habitat loss from acid rain and mountaintop removal coal mining, and mercury poisoning.

Other issues

Sustainability

Renewable energy sources are generally sustainable in the sense that they cannot "run out" as well as in the sense that their environmental and social impacts are generally more benign than those of fossil. However, both biomass and geothermal energy require wise management if they are to be used in a sustainable manner. For all of the other renewables, almost any realistic rate of use would be unlikely to approach their rate of replenishment by nature.

Transmission

If renewable and distribution generation were to become widespread, electric power transmission and electricity distribution systems might no longer be the main distributors of electrical energy but would operate to balance the electricity needs of local communities. Those with surplus energy would sell to areas needing "top ups". That is, network operation would require a shift from 'passive management' — where generators are hooked up and the system is operated to get electricity 'downstream' to the consumer — to 'active management', wherein generators are spread across a network and inputs and outputs need to be constantly monitored to ensure proper balancing occurs within the system. Some governments and regulators are moving to address this, though much remains to be done. One potential solution is the increased use of active management of electricity transmission and distribution networks. This will require significant changes in the way that such networks are operated.

However, on a smaller scale, use of renewable energy produced on site reduces burdens on electricity distribution systems. Current systems, while rarely economically efficient, have shown that an average household with an appropriately-sized solar panel array and energy storage system needs electricity from outside sources for only a few hours per week. By matching electricity supply to end-use needs, advocates of renewable energy and the soft energy path believe electricity systems will become smaller and easier to manage, rather than the opposite.

Controversy over nuclear power as a renewable energy source

In 1983, physicist Bernard Cohen proposed that uranium is effectively inexhaustible, and could therefore be considered a renewable source of energy. He claims that fast breeder reactors, fueled by uranium extracted from seawater, could supply energy at least as long as the sun's expected remaining lifespan of five billion years. Nuclear energy has also been referred to as "renewable" by the politicians George W. Bush, Charlie Crist,  and David Sainsbury.

Inclusion under the "renewable energy" classification could render nuclear power projects eligible for development aid under various jurisdictions. However, it has not been established that nuclear energy is inexhaustible, and issues such as peak uranium and uranium depletion are ongoing debates. No legislative body has yet included nuclear energy under any legal definition of "renewable energy sources" for provision of development support. Similarly, statutory and scientific definitions of renewable energies usually exclude nuclear energy. Commonly sourced definitions of renewable energy sources often omit or explicitly exclude nuclear energy sources as examples.Nuclear fission is not regarded as renewable by the U.S. DOE on the website "What is Energy?"

There are also environmental concerns over nuclear power, including the dangerous environmental hazards of nuclear waste and concerns that development of new plants cannot happen quickly enough to reduce CO2 emissions, such that nuclear energy is neither efficient nor effective in cutting CO2 emissions.

ADVANTAGES AND DISADVANTAGES OF RENEWABLE ENERGY:

There are many energy sources today that are extremely limited in supply. Some of these sources include oil, natural gas, and coal. It is a matter of time before they will be exhausted.

Estimates are that they can only meet our energy demands for another fifty to seventy years. So in an effort to find alternative forms of energy, the world has turned to renewable energy sources as the solution. There are many advantages and disadvantages to this.

Renewable energy sources consist of solar, hydro, wind, geothermal, ocean and biomass. The most common advantage of each is that they are renewable and cannot be depleted. They are a clean energy, as they don't pollute the air, and they don't contribute to global warming or greenhouse effects. Since their sources are natural the cost of operations is reduced and they also require less maintenance on their plants. A common disadvantage to all is that it is difficult to produce the large quantities of electricity their counterpart the fossil fuels are able to. Since they are also new technologies, the cost of initiating them is high.

Solar energy makes use of the sun's energy. It is advantageous because the systems can fit into existing buildings and it does not affect land use. But since the area of the collectors is large, more materials are required. Solar radiation is also controlled by geography. And it is limited to daytime hours and non-cloudy days.

Wind energy uses the power of the wind to produce electricity. Although it is the largest job producer, it is reliant on strong winds. Wind turbines are large and, although you can use the area under them for farming, many consider them unattractive looking. They are also very noisy to operate. In addition, they threaten the wild bird population.

Hydroelectric energy uses water to produce power. This is the most reliable of all the renewable energy sources. On the down side, it affects ecology and causes downstream problems. The decay of vegetation along the riverbed can cause the buildup of methane. Methane is a contributing gas to greenhouse effect. Dams can also alter the natural river flow and affect wildlife. Colder, oxygen poor water can be released into the river, killing fish. And the release of water from the dam can cause flooding.

Geothermal energy uses steam from the Earth's ground to generate power. It uses smaller land areas than other power plants. They can run 24 hours per day, every day of the year. Disadvantages are that it is very site specific and, along with the heat from the Earth, it can also bring up toxic chemicals when obtaining the steam. Drilling geothermal reservoirs and finding them can be an expensive task.

Biomass electricity is produced through the energies from wood, agricultural and municipal waste. It helps save on landfill waste but transportation can be expensive and ecological diversity of land may be affected. In addition, its process needs to be made simpler.

Ocean energy is a clean and abundant energy form. It does, however, have high costs. Ocean thermal energy also requires close to a forty degree Fahrenheit difference in water temperature year round. In addition, construction and laying pipes can cause damage to the ecosystem.

There are many advantages to the use of renewable energy sources. There are also some disadvantages. The fact is energy demands will continue to increase. Through research and development, as well as, new technologies, the hope is many of the disadvantages of renewable sources of energy can be eliminated and we can successfully incorporate it into our power supplies.

                                                 

N.Sankari
http://www.articlesbase.com/electronics-articles/renewable-energy-707358.html

Uses of self made power
Wind Power Generators and solar technology offers a way to produce an endless fountain of electricity for the home or for any other uses around the house like to power a work shop area or perhaps to run pool equipment, or saunas, whirlpools, central heat and air, washers and dryers, hot water heaters. Athough units can be built to supply entire homes with electricity the home owner can be very versatile with design in size, capacities, and whether they would like the electricity to just operate certain pieces of home equipment and appliances or if they would prefer to have enough of a supply to run the entire home.

Use conventional electricity to run smaller appliances:
You may just want to build a system that would supply electricity to all of the units in your home that run on 220 and stay hooked up to the grid and use smaller amounts of electrical power from the electric company to run things like televisions, toasters, refridgerators, lights etc. Just this would still probably easily cut a power bill in half.  Lots of people are hopping aboard as they find out how wind power generators and  solar kits can be very valuable home improvement additions. Many come to realize that not only could it save them large amounts  of money in one respect  but also that the added benefits of increased property value made it a worth while improvement as well as being eco-logically beneficial too!

Clean energy resource
Not only is wind power generators up and coming for their versatility, cost effectiveness, and ease of installation but they address the present global warming issues (environmental) in a very big way, that being that the technology uses the wind and the sun which are both excellent renewable energy resources that dosen't harm the environment in any way. The mining of Fossil fuels, coal, oil and natural gas, are all non-renewable sources of energy and are not only being drastically depleted but are heavily dependent upon in our society to produce electricity by being burnt which harms our atmosphere with the by product that is let over.

For those who don't understand how the wind power generator and solar system works, a wind turbine or windmill is constructed which harnesses the wind and turns a generator, mounted in the prop area of the windmill, a car generator, which produces electricity that travels through a stator that in turn runs down through wires that take it to various other pieces of equipment that is incorporated in the system to register and transform the energy both coming in and going out to be stored and or be used in desired increments of various watts or volts. The solar part of the system comes into play moreso when the wind dies down and their isn't sufficient wind to turn the propeller. The solar panels, which are strategically placed, catch the sunlight through special cells and store energy (electricity) that way.

Important conditions of use... This article MUST NOT be changed or altered in any way. to do so constitutes a crime of Plagiarism. ALWAYS include the resource box with the article when you publish it. You may publish this article on your blog or website, you can email it to your subscribers and submit it to the various online article directories.

All Rights Reserved (c) Copyright 2008

Donald Whitehead
http://www.articlesbase.com/diy-articles/how-can-wind-power-generators-and-solar-help-you-701513.html

Few Doctors are performing a critical operation in the Hospital and there is sudden loss of power.

A national leader is delivering live speech inspiring the population and suddenly there is blackout.

Your favorite rock star is performing live concert on stage and suddenly there is power loss.

A tense match of baseball at night in the floodlights lit stadium has come to climax and suddenly there is power loss.

All these situations are bewildering and even sometimes change the main course of lives. Power loss is mostly unanticipated and continuous supply of electricity cannot be taken for granted. Several threats like blackouts, Power Transformers damage or failure, bad weather, hurricanes, regulated supply of power by the providers to meet the ever increasing demand and so on and so forth contribute to the interruptions in power supply.

A Generator would eliminate these worries without even calling our attention that there is power cut. Whether it's a hospital, commercial complex, theaters, factories, construction sites camps or even small houses, Generators can be used to get rid of the power cuts. Depending upon the amount of usage, the Generators of different capacities can be installed at the respective locations.

Generators are available with capacities ranging from as small as 100 Watts to as large as hundreds of Mega Watts. For domestic usage, a Generator of at least 1,000 watts can be installed to power the main lights, television and refrigerator. For commercial complexes or factories, Generators of higher capacity like 100 KW to 10 MW can be used to run machineries. The Generators are run on fuel like gasoline, natural gas, diesel and propane. Of all, the diesel generators, though expensive are fuel-efficient and require less maintenance but harder to start in cold weathers.

Usually the noise levels of the Generators are too high and hence are always to be installed outside the houses or in the cellars. They should be used as per the guidelines provided by the manufacturer and care should be taken that they are not overloaded. A qualified electrician must be assigned the job of connecting the generator to the wirings of required equipments.

The standby generators can automatically detect the disruption in power supply and begins supplying the power within fraction of seconds.

Now, the lives are saved with successful operations on the patients by the Doctors, favorite rock stars live performances and the game of baseball can be watched without interruptions. So the darkness in the lives is dissociated by using the standby Generator.

Barney Garcia
http://www.articlesbase.com/technology-articles/generators-the-power-of-generating-power-71936.html

Endless exposure to environmental pollution makes us contemplate a world that will be untainted and quiet and free of all kinds of impurities. Well, this is not impossible to achieve if we become a little careful about our environment and start using such products that cause less pollution in the world.

Biodiesel is one such product that helps to keep the environment clean and uncontaminated. This clean diesel fuel is produced from 100% natural, 100% renewable vegetable sources. The vegetable oils such as rapeseed, palm, olive, peanut, soy bean, safflower, sunflower, castor oil etc. can be used as the good source of bio-diesel.

Stepping into the new millennium, the people worldwide have become more environment-conscious and this growing sensibility toward environment is evident from the increasing use of bio-diesel generators in the businesses as well as in the households.

Here we offer the answers to some of the most frequently asked questions about biodiesel generators.

What are the major advantages of biodiesel generator?
There are many reasons why you should consider switching from petroleum based diesel fuel to biodiesel generator.

- The first and foremost reason is: it is the most environment-friendly fuel.

- It is made from organic oil by-products leading to an efficient waste management system.

- Then biodiesel has high lubricating and solvent features. This reduces strain on engines and helps in cleaning out old engine oil deposits. This ensures a longer engine life.

Is bio diesel generator cost effective?
Biodiesel can be used as the most efficient fuel source for the cars that use diesel engines. It will cost you approximately $2.5o/gallon and thus you will be able to save good amount of dollars as you switch from a gas driven car to a biodiesel powered vehicle. Above all, if you use biodiesel generators in your home, RVs or businesses, you will gain considerable tax incentives.

How biodiesel is used in the generators?
Biodiesel can be used in its 100% pure form without any mixing of other materials. But its most wide spread usage involves a blending with petroleum diesel. This produces a mixture that retains the benefits of both types of fuels.
Even if you use blends of biodiesel, instead of its pure form, you are entitled to get
tax incentives.

What is the future of biodiesel generator?
The future of biodiesel generators is rather bright, thanks to its pollution free features. The cleaner burning and less wear on engine, makes it the ideal fuel for running generators in the households as well as in the businesses. It is said that the diesel powered generators can increase their efficiency almost ten times if they start using bio diesel in place of petroleum diesel. Especially for higher power applications, the usage of biodiesel is expected to increase manifold in the years to come.

anonymous
http://www.articlesbase.com/causes-and-organizations-articles/biodiesel-generators-some-faqs-answered-85506.html

From January, 2006.

Investing in gas & oil investments is all about reducing your risk, and spreading-out your investment funds, or diversifying in as many new prospective oil & gas wells as possible while building a portfolio of new commercially productive wells. You need to be able to do this while taking advantage of the opportunities to invest in many fields as practical.

Your goal should be to own working interest, or have direct participation in mulitiple lease hold interests within several, or many areas of mutual interest. In our business, these lease hold interests, are located within what are called Area's of Mutual Interest (AMI).

You must of course find and trust the right operators, company, or companies, who you can then invest with to achieve a successful outcome, plus, in almost all instances, do not invest with a company unless it is registered & licensed with the NASD, and whose brokers are licensed and registered in your state of residence as well.

You must check on this requirement, and you should not receive an offer to invest, or a memorandum until you are approved to be doing business by the licensed, and registered company, or companies you are reviewing...it's a two way street...they need to know who you are and you need to know about them before making any investment decisions.

SIPC insurance is only available if you are investing with both registered, and licensed broker/dealers, and registered representatives, don't make the mistake of short cutting this important step to success in our industry.

Investing in many 'area's of mutual interests', or 'leasehold interests' with multiple operators allows you to benefit from the investment strategies of many operators, and prospect generators, not only to realize the benefits of diversifying with many very successful operators, and prospect generators...but to be able to directly profit from their major discoveries which can, and do occur throughout the most lucrative areas; where large commercial, and recoverable quantities of oil & gas are being found by these companies, or pro's in our industry...you just never know when or where a big discovery will be made...capitalizing on the discovery is a key to success in our business...being postioned to take advantage of the opportunities when they occur takes both luck, and skill...plus a plan...

You must have the proper investment structure, and legal entity to be able to invest relatively small amounts of your hard earned money in many wells which allows you to fully diversify your portfolio, and get all of the tax benefits possible from your investment at the same time. The direct participation, working interest ownership method of investing in new oil & gas drilling prospects is how the industry, or people in the business acquire fractional oil & gas ownership in both developmental, and exploratory wells in the US.

Let us know if you would like to receive more information about how to do your due dilligence to find the right companies to do business with, and what to look for when you do.

Dennis Stutes
http://www.articlesbase.com/finance-articles/investing-in-oil-and-natural-gas-is-all-about-diversification-98805.html

Many people are realizing how useful it can be to have a generator around. Whether it's for powering some lights in a power outage or bringing some comforts of home to the campsite, a good gas generator will allow you to produce electricity anywhere. Generators vary greatly in price and features. The main ways they differ are amount of electricity produced, the quality of the power generated, and the weight and noisiness of the product.

It's a good idea to total up the number of watts consumed the products that you anticipate running concurrently on the generator. Keep in mind that some products, particularly this with big motors, may need a lot of power to start but then need much less power on an ongoing basis. If necessary, you can always decide to start them first before plugging in other devices in order to maximize the efficiency of the generator.

Generators are known for often producing bad qualities of power. This can be fine for many power tools, but can damage sensitive electronics like laptops. If you need to power electronics look for a natural gas generator meant for doing this. Honda makes some compact generators that do a great job of providing good quality power. Size and noise shielding can also be important. A generator that you need to carry in your trunk and use when camping should be smaller and lighter. If you are working at home outside your shop, a heavier and louder generator may be fine for your needs.

By Jim Tonkins

Jim Tonkins writes about snapper mower parts and lawnmowers for sale.

Article Source: http://EzineArticles.com/?expert=Jim_Tonkins
http://EzineArticles.com/?Tips-on-Purchasing-a-Generator&id=2818809

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