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Solar Electricity and how it works - Photovoltaic Systems and Components, Grid-Connecte... - 0 views

www.solardirect.com/...pvbasics.htm grid solar transported works how converted
shared by dpurdy on 26 Oct 12 - No Cached
  • A valuable feature of photovoltaic systems is the ability to connect with the existing power grid which allows owners to sell excessive electricity back to the utility with a plan known as (5) Net Metering. At times when you are not using all of the electricity produced by your system, your meter will spin backwards selling the electricity back to the (6) utility power grid at retail rate.
  • (1) Solar Electric or PV modules convert sunlight to electricity. The PV modules generate DC electricity - or direct current - sending it to the inverter. (2) The inverter transforms the DC power into AC electricity for ordinary household needs. (3) Existing electrical panel distributes solar electricity and utility power to (4) loads (appliances). For systems with a battery backup (optional), the inverter also regulates the charge of batteries. The electricity stored in the batteries can be used at night or during blackouts.
    • dpurdy
      dpurdy on 26 Oct 12
       
      Great video showing solar cell (photovoltaic) in action.
  • dpurdy on 26 Oct 12
     
    Solar is not always connected to grid. Sometimes there are batteries, otherwise your system is connected to grid to share excess electricity.
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Is Current Wind Growth Sustainable? | Renewable Energy World Magazine Article - 0 views

www.renewableenergyworld.com/...the-big-question1 wind sustainable
shared by tuckeremi99 on 22 Oct 12 - No Cached
  • wind farms are not only capital intensive but also have a long gestation period – could prove to be prohibitive for many potential investors.
  • terms of global policy, governments need to boost investments in onshore and offshore wind generation through the right mix of supportive policies and incentives.
  • wind energy will become even more attractive as it serves as an insurance against future increases in fuel and carbon prices, while reducing our dependency on fossil fuels imported from volatile regions.
  • ...17 more annotations...
  • Both in Europe and in the US, some 40% of all new power generating capacity installed in the past two years was wind energy. If the economic crisis continues, however, the reduction in power demand will start to impact wind energy, simply because of lower demand for new power plants. Nevertheless, the medium and long-term outlook remains very healthy, as political momentum is building towards a low carbon economy, without which humankind will not overcome three of the biggest concerns of our time – climate protection, energy security and the provision of jobs.
  • Wind power’s credentials as a rapidly deployable clean technology have put it at the forefront in the fight against climate change. Neither new nuclear capacity or carbon capture and storage (CCS) will contribute to CO2 reductions within the timeframe that the climate scientists give us. As a no-fuel, no-carbon emissions source of electricity, wind energy will play a big part in reducing carbon emissions before 2020.
  • A key element for policy makers is to dramatically improve competition in power markets, to ensure that investors, rather than consumers, are exposed to
  • The growth in wind power capacity has shown no signs of slowing, even in these tough economic times. For two years running there has been more new wind power capacity installed than any other power generating technology in Europe – including coal, gas and nuclear. In 2009 the European market for wind turbines experienced a 23% growth rate, the same as the average growth rate over the last 15 years.
  • future carbon and fuel price risk.
  • Wind power is a leader now, and will remain so in the future, attracting big investments and creating jobs. There is a boom waiting to happen in offshore wind energy. But, Europe’s ageing electricity grids must be upgraded and extended, and the EU must also pursue a drive to build an offshore grid in the North and Baltic seas that will connect offshore wind farms to the shore, piping vast amounts of CO2-free energy to consumers at affordable prices.
  • cleaner energy
  • he fact that wind is the most cost effective and scalable renewable source of energy.
  • past several years.
  • dynamic growth rate of the
  • Because of the small size of the existing installed base, the offshore wind sector will see higher growth percentages while the number of onshore turbines will continue to outpace those installed offshore.
  • Continued investment in grid infrastructure is critical for growth as well as wind turbine technology investments that improve efficiency and reliability while driving down emissions. Countries with the most efficient and flexible permitting processes will benefit by realizing the installation of the most advanced technology.
  • but renewable sources, and in large part, wind energy, have an extremely important role to play.
  • A fundamental value of wind is that it lowers risk in the overall generation mix by bringing in a fixed electricity cost. You don’t have any fuel risk, so you don’t have these big price spikes that you see when you generate electricity from gas or oil.
  • The wind power market is still intact. Demand for ‘green’ power stations remains unabated and nearly all governments have adopted policies aimed at environmental sustainability.
  • As our industry is still very young, wind power currently contributes only around 1.5% to global electricity supplies.
  • this merely serves to highlight the enormous potential for the future, especially as wind power is not only clean but also inexpensive. This is something that more and more governments and energy companies are realizing.
  • tuckeremi99 on 22 Oct 12
     
    "The growth in wind power capacity has shown no signs of slowing, even in these tough economic times. For two years running there has been more new wind power capacity installed than any other power generating technology in Europe - including coal, gas and nuclear. In 2009 the European market for wind turbines experienced a 23% growth rate, the same as the average growth rate over the last 15 years."Both in Europe and in the US, some 40% of all new power generating capacity installed in the past two years was wind energy. If the economic crisis continues, however, the reduction in power demand will start to impact wind energy, simply because of lower demand for new power plants. Nevertheless, the medium and long-term outlook remains very healthy, as political momentum is building towards a low carbon economy, without which humankind will not overcome three of the biggest concerns of our time - climate protection, energy security and the provision of jobs." "Wind power is a leader now, and will remain so in the future, attracting big investments and creating jobs. There is a boom waiting to happen in offshore wind energy. But, Europe's ageing electricity grids must be upgraded and extended, and the EU must also pursue a drive to build an offshore grid in the North and Baltic seas that will connect offshore wind farms to the shore, piping vast amounts of CO2-free energy to consumers at affordable prices."
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What are the advantages and disadvantages of solar energy - 0 views

wiki.answers.com/..._disadvantages_of_solar_energy solar advantages disadvantages
shared by tushabeper99 on 11 Mar 13 - No Cached
  • tushabeper99 on 11 Mar 13
     
    "Advantages: Solar power gives you a return on your investment, while paying your utility for electricity gives you 0% return. Solar energy is renewable unlike the conventional resources (coal, oil) which will inevitably run out. Non-polluting, no carbon dioxide like fossil fuels Free except for capital expenses. Longevity - solar panels can last over twenty years Low maintenance - solar panels require very little upkeep Independence - an off-grid system allows you to break free from the electrical grid Environmentally friendly because the conversion of energy doesn't produce any carbon dioxide. It comes from the sun, which, unless you are in The South or North pole, comes out almost everyday Solar power is better for the environment, compared to burning fossil fuels and other electrical power. sun is renewable You get clean energy without harming the environment [in term of carbon emissions] , in certain countries, excessive power generated can be sold back to local electricity provider reduces pollution helps create jobs - shores up economy - to build -> you hire - innovate-maintain - basically economic activities reduced dependence on fossil fuels Once installed, the power is free It is environmentally friendly and no pollution is associated with solar power You can sell your excess power back to the power companies It can be installed anywhere You can use batteries to store power for use at night Energy from the sun is renewable, that is, it keeps on coming It is free It does no damage to the earth or its atmosphere It produces no carbon dioxide It doesn't have to be dug up from the ground like coal, oil, natural gas, or uranium It doesn't have to be cut down, like wood from forests. It produces clean, green power in the form of electricity and can be used to power just about everything we need. There is more solar energy landing on the earth every day than it would take to supply the world for a year. Solar energy can heat swimming pools, power calcul
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Photovoltaic power station - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...Photovoltaic_power_station infrastructure transported grid solar
shared by dpurdy on 26 Oct 12 - No Cached
  • A photovoltaic power station, also known as a solar park, is a large-scale photovoltaic system designed for the supply of merchant power into the electricity grid. They are differentiated from most building-mounted and other decentralised solar power applications because they supply power at the utility level, rather than to a local user or users. They are sometimes also referred to as solar farms or solar ranches, especially when sited in agricultural areas.
  • Most stations are sited within a few kilometres of a suitable grid connection point. This network needs to be capable of absorbing the output of the solar park when operating at its maximum capacity. The project developer will normally have to absorb the cost of providing powerlines to this point and making the connection; in addition often to any costs associated with upgrading the grid, so it can accommodate the output from the plant.
  • Income is therefore affected not only by the reliability of equipment within the plant, but also by the availability of the grid network to which it is exporting
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Solar electricity PV (photovoltaic) panels explained - benefits, costs, savings, earnin... - 1 views

www.energysavingtrust.org.uk/...Solar-panels-PV solar sustainable
shared by bolendev99 on 08 Mar 13 - No Cached
  • bolendev99 on 08 Mar 13
     
    "The benefits of solar electricity Cut your electricity bills: sunlight is free, so once you've paid for the initial installation your electricity costs will be reduced. Get paid for the electricity you generate: the government's Feed-In Tariffs pay you for the electricity you generate, even if you use it. Sell electricity back to the grid: if your system is producing more electricity than you need, or when you can't use it, you can sell the surplus back to the grid. Cut your carbon footprint: solar electricity is green, renewables energy and doesn't release any harmful carbon dioxide] or other pollutants. A typical home solar PV system could save over a tonne of carbon dioxide per year - that's more than 30 tonnes over its lifetime. "
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BBC News - Wilburton giant solar farm connected to National Grid - 0 views

www.bbc.co.uk/...ngland-cambridgeshire-14218355 solar grid transported infrastructure how
shared by dpurdy on 26 Oct 12 - No Cached
  • dpurdy on 26 Oct 12
     
    Video shows farm connected to grid. This shows the type of infrastructure that will need to be installed. 
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Connecting renewable energy to the grid - 2 views

www.abb.com/...f7a3a6aedc12577c20033dbf5.aspx grid solar wind transported
shared by dpurdy on 03 Nov 11 - No Cached
  • Big cities need large amounts of electricity to function. Often, this is transported from generating sites located in remote areas hundreds or even thousands of kilometers away. The question is how to move as much electricity as possible from renewable generation sites like hydro plants and wind parks without impairing the function of the power networks that need it.
  • One of the challenges of renewable power generation like wind and solar power is that it can be interrupted, and this variability affects the stability of the power produced
  • The "smart grid" will create a power network that is more reliable, flexible, secure and efficient
  • ...1 more annotation...
  • Power grids are facing a major transformation, driven by the need to integrate renewable energy
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Sierra Club Green Home » Blog Archive Fuel Cells: Environmental Benefits » Si... - 0 views

www.sierraclubgreenhome.com/...fuel-cells-eco-benefits fuel cell sustainable
shared by labrumbra99 on 12 Mar 13 - No Cached
  • The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country!
  • The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country!
  • The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country!
  • ...4 more annotations...
  • fuel cells
  • metimes produce a by-product of water or heat, though hydrogen fuel cells are considered more difficult to work with because of transportation and storage. More user friendly fuel cells which use natural gas with emissions that are much lower than those produced by conventional engines or energy sources and can reduce your carbon footprint by around 40%. Additionally, there are only negligible levels of NOx, SOx, Volatile organic compounds and particulates, which is a drastic improvement over traditional means of grid power production. Besides the decreased CO2 emissions and high efficiency rates, fuel c
  • The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country!
  • The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country!
  • labrumbra99 on 12 Mar 13
     
    " The environmental impact of fuel cells depends on the type of cell and the fuel being used. Fuel cells can run on a variety of sources, from natural gas to hydrogen to ethanol to biogas. Those that run on hydrogen can sometimes produce a by-product of water or heat, though hydrogen fuel cells are considered more difficult to work with because of transportation and storage. More user friendly fuel cells which use natural gas with emissions that are much lower than those produced by conventional engines or energy sources and can reduce your carbon footprint by around 40%. Additionally, there are only negligible levels of NOx, SOx, Volatile organic compounds and particulates, which is a drastic improvement over traditional means of grid power production. Besides the decreased CO2 emissions and high efficiency rates, fuel cells offer plenty of positive environmental impacts that should be considered by investors and consumers as solutions for cleaner energy are being further researched. 1. Fuel Conservation The use of fuel cells can significantly diminish our dependency on foreign oil. Since fuel cells make energy electrochemically and do not burn fuel like conventional combustion systems, they are much more efficient. Admittedly, some fuel cells need fossil fuels to start their functions; most residential systems run partially off of natural gas. If just 20% of the cars in America used fuel cells, we could cut oil imports by 1.5 million barrels per day. This is $44 billion per year that could remain in the country! 2. Combined Heat and Power The greatest benefit from high powered, well designed fuel cells is the heat and power produced. This means that a property can reduce additional investments to heat their indoor areas or water. In this case, less is more. Since the heat can be redirected to heat water, the environmental benefit from this is the ability to heat the hot water supply without a need for a separate system as is the case with home solar."
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First Tidal Power in U.S. Starts Flowing to the Grid - IEEE Spectrum - 0 views

spectrum.ieee.org/...wer-starts-flowing-to-the-grid tide current
shared by dpurdy on 19 Mar 13 - No Cached
  • An offshore turbine is finally spinning in the United States!
  • Bay of Fundy, off the Maine coast. The TidGen has a peak power output of 180 kilowatts, enough to power around 25 to 30 homes
  • dpurdy on 19 Mar 13
     
    The ONLY tidal power plant connected to the grid in the US is online.
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Wave power - Wikipedia, the free encyclopedia - 2 views

en.wikipedia.org/...Wave_power wave sustainable history location what grid
shared by dpurdy on 03 Nov 11 - No Cached
  • Waves are generated by wind passing over the surface of the sea. As long as the waves propagate slower than the wind speed just above the waves, there is an energy transfer from the wind to the waves.
  • The first known patent to utilize energy from ocean waves dates back to 1799 and was filed in Paris by Girard and his son.[12] An early application of wave power was a device constructed around 1910 by Bochaux-Praceique to light and power his house at Royan, near Bordeaux in France
  • Once the wave energy is captured at a wave source, power must be carried to the point of use or to a connection to the electrical grid by transmission power cables.[2
  • ...2 more annotations...
  • The realistically usable worldwide resource has been estimated to be greater than 2 TW.[49][50] Locations with the most potential for wave power include the western seaboard of Europe, the northern coast of the UK, and the Pacific coastlines of North and South America, Southern Africa, Australia, and New Zealand. The north and south temperate zones have the best sites for capturing wave power. The prevailing westerlies in these zones blow strongest in winter. Waves are very predictable; waves that are caused by winds can be predicted five days in advance.[citation needed]
  • There is a potential impact on the marine environment. Noise pollution, for example, could have negative impact if not monitored, although the noise and visible impact of each design varies greatly.[5]. Other biophysical impacts (flora and fauna, sediment regimes and water column structure and flows) of scaling up the technology is being studied.[51] In terms of socio-economic challenges, wave farms can result in the displacement of commercial and recreational fishermen from productive fishing grounds, can change the pattern of beach sand nourishment, and may represent hazards to safe navigation.[52] Waves generate about 2,700 gigawatts of power
  • anonymous on 28 Sep 13
     
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PowerPedia:Solar Energy - PESWiki - 2 views

peswiki.com/...PowerPedia:Solar_Energy solar pollution location grid
shared by dpurdy on 03 Nov 11 - No Cached
  • Solar power is pollution free during use. Production end wastes and emissions are manageable using existing pollution controls.
  • In situations where connection to the electricity grid is difficult, costly, or impossible (such as island communities, areas not served by a power grid, illuminated roadside signs, and ocean-going vessels) harvesting solar power is often an economically competitive alternative to energy from traditional source
  • Intermittency: It is not available at night and is reduced when there is cloud cover, decreasing the reliability of peak output performance or requiring a means of energy storage.
  • ...1 more annotation...
  • Locations at high latitudes or with frequent substantial cloud cover offer reduced potential for solar power use.
  • anonymous on 02 Oct 13
     
    Most quality online stores. Know whether you are a trusted online retailer in the world. Whatever we can buy very good quality. and do not hesitate. Everything is very high quality. Including clothes, accessories, bags, cups. Highly recommended. This is one of the trusted online store in the world. View now www.retrostyler.com
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Solar power - Sustainable green energy to protect our economy and environment | PARTHA ... - 2 views

saferenvironment.wordpress.com/...ct-our-economy-and-environment solar sustainable
shared by sokolkyl00 on 11 Mar 13 - No Cached
  • A Solar Energy system can operate entirely independently, not requiring a connection to a power or gas grid at all. Systems can therefore be installed in remote locations, making it more practical and cost-effective than the supply of utility electricity to a new site.
  • A Solar Energy system can operate entirely independently, not requiring a connection to a power or gas grid at all. Systems can therefore be installed in remote locations, making it more practical and cost-effective than the supply of utility electricity to a new site.
  • bolendev99 on 11 Mar 13
     
    "It offers much more self-reliance than depending upon a power utility for all electricity."
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Photovoltaics - Timeline of the History of Photovoltaics - 0 views

inventors.about.com/...Photovoltaics.htm solar convert
shared by whalenkil98 on 12 Mar 13 - Cached
  • 1839: Nineteen-year-old Edmund Becquerel, a French experimental physicist, discovered the photovoltaic effect while experimenting with an electrolytic cell made up of two metal electrodes. 1873: Willoughby Smith discovered the photoconductivity of selenium.
  • kenyonlau99 on 12 Mar 13
     
    "Today's photovoltaic systems are used to generate electricity to pump water, light up the night, activate switches, charge batteries, supply power to the utility grid, and much more. 1839: Nineteen-year-old Edmund Becquerel, a French experimental physicist, discovered the photovoltaic effect while experimenting with an electrolytic cell made up of two metal electrodes. 1873: Willoughby Smith discovered the photoconductivity of selenium. 1876: Adams and Day observed the photovoltaic effect in solid selenium. 1883: Charles Fritts, an American inventor, described the first solar cells made from selenium wafers. 1887: Heinrich Hertz discovered that ultraviolet light altered the lowest voltage capable of causing a spark to jump between two metal electrodes. 1904: Hallwachs discovered that a combination of copper and cuprous oxide was photosensitive. Einstein published his paper on the photoelectric effect. 1914: The existence of a barrier layer in PV devices was reported. 1916: Millikan provided experimental proof of the photoelectric effect. 1918: Polish scientist Czochralski developed a way to grow single-crystal silicon. 1923: Albert Einstein received the Nobel Prize for his theories explaining the photoelectric effect. 1951: A grown p-n junction enabled the production of a single-crystal cell of germanium. 1954: The PV effect in Cd was reported; primary work was performed by Rappaport, Loferski and Jenny at RCA. Bell Labs researchers Pearson, Chapin, and Fuller reported their discovery of 4.5% efficient silicon solar cells; this was raised to 6% only a few months later (by a work team including Mort Prince). Chapin, Fuller, Pearson (AT&T) submitted their results to the Journal of Applied Physics. AT&T demonstrated solar cells in Murray Hill, New Jersey, then at the National Academy of Science Meeting in Washington, DC. 1955: Western Electric began to sell commercial licenses for silicon PV technologies; early successful products included PV-powered dolla
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Solar Photovoltaics | Solar Energy - 0 views

www.premierpower.com/...how_solar_works.php solar form
shared by dylan purner on 08 Mar 13 - No Cached
  • What are photovoltaics? The word comes from “photo” (light) and “voltaic” (energy produced by a chemical reaction). Photovoltaic technology refers to the conversion of light into energy at the atomic level. Certain materials, such as silicon, cadmium, and selenium, have the ability to absorb light photons and release electrons. Solar photovoltaic technology harnesses these freed electrons and uses their electric current as DC electricity (NASA 2002). Fully powered by the sun, solar photovoltaics are a free, clean, and renewable source of energy that can be used independently of or in conjunction with conventional grid energy. Unlike solar thermal systems, solar energy panels require little maintenance, necessitate no moving parts, and last for 30-40 years.
  • kenyonlau99 on 08 Mar 13
     
    " Photovoltaics: The Science Behind Solar Energy           What are photovoltaics? The word comes from "photo" (light) and "voltaic" (energy produced by a chemical reaction). Photovoltaic technology refers to the conversion of light into energy at the atomic level. Certain materials, such as silicon, cadmium, and selenium, have the ability to absorb light photons and release electrons. Solar photovoltaic technology harnesses these freed electrons and uses their electric current as DC electricity (NASA 2002). Fully powered by the sun, solar photovoltaics are a free, clean, and renewable source of energy that can be used independently of or in conjunction with conventional grid energy."
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Energy and kids - 1 views

www.kids.esdb.bg/solar.html solar how converted
shared by phinneycha99 on 26 Oct 12 - No Cached
  • phinneycha99 on 26 Oct 12
     
    "Photovoltaic cells, like batteries, generate direct current (DC) which is generally used for small loads (electronic equipment).  When DC from photovoltaic cells is used for commercial applications or sold to electric utilities using the electric grid, it must be converted to alternating current (AC) using inverters, solid state devices that convert DC power to AC. "
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TLC Home "How many solar cells would I need in order to provide all of the electricity ... - 0 views

tlc.howstuffworks.com/...question418.htm
shared by gillinghammic98 on 15 Mar 12 - No Cached
  • Because solar electricity is so expensive, you would normally go to great lengths to reduce your electricity consumption. Instead of a desktop computer and a monitor you would use a laptop computer. You would use fluorescent lights instead of incandescent. You would use a small B&W TV instead of a large color set. You would get a small, extremely efficient refrigerator­. By doing these things you might be able to reduce your average power consumption to 100 watts. This would cut the size of your solar panel and its cost by a factor of 6, and this might bring it into the realm of possibility.
  • From our calculations and assumptions abo­ve, we know that a solar panel can generate 70 milliwatts per square inch * 5 hours = 350 milliwatt hours per day. Therefore you need about 41,000 square inches of solar panel for the house. That's a solar panel that measures about 285 square feet (about 26 square meters). That would cost around $16,000 right now. Then, because the sun only shines part of the time, you would need to purchase a battery bank, an inverter, etc., and that often doubles the cost of the installation.If you want to have a small room air conditioner in your bedroom, double everything.
  • A "typical home" in America can use either electricity or gas to provide heat -- heat for the house, the hot water, the clothes dryer and the stove/oven. If you were to power a house with solar electricity, you would certainly use gas appliances because solar electricity is so expensive. This means that what you would be powering with solar electricity are things like the refrigerator, the lights, the compute­r, the TV, stereo equipment, motors in things like furnace fans and the washer, etc. Let's say that all of those things average out to 600 watts on average. Over the course of 24 hours, you need 600 watts * 24 hours = 14,400 watt-hours per day.
  • ...1 more annotation...
  • The thing to remember, however, is that 100 watts per hour purchased from the power grid would only cost about 24 cents a day right now, or $91 a year. That's why you don't see many solar houses unless they are in very remote locations. When it only costs about $100 a year to purchase power from the grid, it is hard to justify spending thousands of dollars on a solar system.
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Grid tie Solar Power Systems - Grid tie Solar Panel Systems - 1 views

www.wholesalesolar.com/gridtie.html
shared by dpurdy on 12 Mar 12 - No Cached
    • dpurdy
      dpurdy on 12 Mar 12
       
      Use the solar cell picture.
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Wind power - Wikipedia, the free encyclopedia - 1 views

en.wikipedia.org/Wind_power power
shared by rutalil00 on 13 Mar 12 - Cached
  • Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships
  • Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electricity, windmills for mechanical power, windpumps for water pumping or drainage, or sails to propel ships.
  • The total amount of available power from the wind is considerably more than present human power use from all sources.[3] At the end of 2011, worldwide nameplate capacity of wind-powered generators was 238 gigawatts (GW), growing by 41 GW over the preceding year.[4] Wind power now (2010 data) has the capacity to generate 430 TWh annually, which is about 2.5% of worldwide electricity usage.[5][6] Over the past five years (2010 data) the average annual growth in new installations has been 27.6 percent. Wind power market penetration is expected to reach 3.35 percent by 2013 and 8 percent by 2018.[7][8] Several countries have already achieved relatively high levels of wind power penetration, such as 21% of stationary electricity production in Denmark,[5] 18% in Portugal,[5] 16% in Spain,[5] 14% in Ireland[9] and 9% in Germany in 2010.[5][10] As of 2011, 83 countries around the world are using wind power on a commercial basis
  • ...8 more annotations...
  • A large wind farm may consist of several hundred individual wind turbines which are connected to the electric power transmission network. Offshore wind power can harness the better wind speeds that are available offshore compared to on land, so offshore wind power’s contribution in terms of electricity supplied is higher.[11] Small onshore wind facilities are used to provide electricity to isolated locations and utility companies increasingly buy back surplus electricity produced by small domestic wind turbines. Although a variable source of power, the intermittency of wind seldom creates problems when using wind power to supply up to 20% of total electricity demand, but as the proportion rises, increased costs, a need to use storage such as pumped-storage hydroelectricity, upgrade the grid, or a lowered ability to supplant conventional production may occur.[12][13][14] Power management techniques such as excess capacity, storage, dispatchable backing supply (usually natural gas), exporting and importing power to neighboring areas or reducing demand when wind production is low, can mitigate these problems.
  • Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation, and uses little land. In operation, the overall cost per unit of energy produced is similar to the cost for new coal and natural gas installations.[15] The construction of wind farms is not universally welcomed, but any effects on the environment from wind power are generally much less problematic than those of any other power source
  • Wind is the movement of air across the surface of the Earth, affected by areas of high pressure and of low pressure.[35] The surface of the Earth is heated unevenly by the Sun, depending on factors such as the angle of incidence of the sun's rays at the surface (which differs with latitude and time of day) and whether the land is open or covered with vegetation. Also, large bodies of water, such as the oceans, heat up and cool down slower than the land. The heat energy absorbed at the Earth's surface is transferred to the air directly above it and, as warmer air is less dense than cooler air, it rises above the cool air to form areas of high pressure and thus pressure differentials. The rotation of the Earth drags the atmosphere around with it causing turbulence. These effects combine to cause a constantly varying pattern of winds across the surface of the Earth.[35]
  • Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electrical power, windmills for mechanical power, wind pumps for water pumping or drainage, or sails to propel ships.
  • Compared to the environmental impact of traditional energy sources, the environmental impact of wind power is relatively minor in terms of pollution
  • Wind energy is the kinetic energy of air in motion, also called wind
  • ind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation and uses little land.[2] The effects on the environment are generally less problematic than those from other powe
  • Wind power is very consistent from year to year but has significant variation over shorter time scales. The intermittency of wind seldom creates problems when used to supply up to 20% of total electricity demand,[5] but as the proportion increases, a need to upgrade the grid, and a lowered ability to supplant conventional production can occur.
  • krolnik98 on 13 Mar 12
     
    wind turbine stuff
  • pondalb98 on 11 Mar 13
     
    "Wind power is the conversion of wind energy into a useful form of energy, such as using wind turbines to make electrical power, windmills for mechanical power, wind pumps for water pumping or drainage, or sails to propel ships."
  • rutalil00 on 24 Sep 13
     
    Wind power, as an alternative to fossil fuels, is plentiful, renewable, widely distributed, clean, produces no greenhouse gas emissions during operation and uses little land.[2] The effects on the environment are generally less problematic than those from other power sources. As of 2011, Denmark is generating more than a quarter of its electricity from wind and 83 countries around the world are using wind power on a commercial basis.[3] In 2010 wind energy production was over 2.5% of total worldwide electricity usage, and growing rapidly at more than 25% per annum. The monetary cost per unit of energy produced is similar to the cost for new coal and natural gas installations.[4]
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SOLAR POWER BENEFITS - 0 views

www.vivasolar.com/solarpowerbenifits.html solar sustainable cost pollution
shared by dextereli99 on 12 Mar 13 - No Cached
  • Advantages of solar power are many. Although solar power is an energy source that we have only recently tapped into, it may easily become the most important energy source of the future. • Solar power is a renewable and natural resource. • Solar power is non-polluting. Unlike oil, solar power does not emit greenhouse gases or carcinogens into the air. • Light and energy from the sun costs nothing. Once you purchase the equipment to collect and convert energy from the sun, it costs you nothing to run. • Solar cells require little maintenance. • Solar cells can last a lifetime. • Solar power is silent.
  • • Solar energy can be used to heat water, dry clothes, heat swimming pools, power attic fans, power small appliances, produce light for both indoors and outdoors, and even to power cars, among other things.
  • • Solar energy products can be very expensive. The initial cost is, perhaps, the main disadvantage of solar energy. • To reach maximum level of efficiency you need a relatively large area to install solar panels. • Depending where you live (Arizona vs. Alaska, around many shady trees or in the desert, etc.), you will get different results with solar energy systems.
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  • • If you have a really good solar energy system, one that produces even more energy than you use, your utility company might buy that extra energy from you. • When you use solar energy, you and your home become independent on foreign or other sources of energy which raise costs quickly. • To run solar water pumps, you do not even need to connect to a gas or power grid. • Solar energy cannot be produced at night or if there is a lot of pollution in the air or clouds over the sun.
  • • Of course, realize you can have a battery backup system for your solar energy system that will take care of the problems that could arise when the sun does not. • You can install solar energy in remote locations. • If there is a power outage, but you run on solar, you will still have electricity! • As your energy needs grow, you can add more solar panels
  • • Technology for solar energy is constantly improving.
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