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Yale Environment 360: Wind Energy Now Cheaper Than Fossil Fuel Power Plants in Australia - 0 views

e360.yale.edu/...3762 wind cost
shared by jack wells on 12 Mar 13 - No Cached
  • Unsubsidized wind power is now cheaper than electricity produced from new coal- and natural gas-fired power stations in Australia, according to an analysis by Bloomberg New Energy Finance. The study said that electricity can be supplied from a new wind farm at a cost of 80 Australian dollars per megawatt hour, compared to 143 Australian dollars from a new coal plant and 116 Australian dollars from a new natural gas plant.
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NREL: Learning - Geothermal Electricity Production - 0 views

www.nrel.gov/...re_geo_elec_production.html geothermal how
shared by dpurdy on 03 Nov 11 - Cached
  • Geothermal Electricity Production This geothermal power plant generates electricity for the Imperial Valley in California. Geothermal power plants use steam produced from reservoirs of hot water found a few miles or more below the Earth's surface to produce electricity. The steam rotates a turbine that activates a generator, which produces electricity.
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geothermal CO2 emissions - 0 views

www.energyadvocate.com/air_geo.htm geothermal co2
shared by wooddan99 on 25 Sep 13 - No Cached
  • Somewhat surprisingly, the hot air that carries the heat from the earth at geothermal sites also contains carbon dioxide, CO2, the Greenhouse Gas that sends anti-technologists into a frenzy.  The suite of 20 geothermal sites from which Southern California Electric is obligated to buy electricity produces 730 tonnes of CO2 for every gigawatt-hour (GWh) of electricity produced.  Across the spectrum of all natural-gas power plants in the US, the average CO2 production is 519 tonnes per GWh.  That is, the geothermal power plants, which burn no fossil fuels whatsoever, produce 41% more CO2 than the run-of-the-mill natural gas power plant for the same amount of electrical energy produced.
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Mapping US Tidal Power Potential | Climate Central - 0 views

www.climatecentral.org/...pping-us-tidal-power-potential tide energy current
shared by Xin Wang on 12 Mar 13 - No Cached
  • It’s estimated that tidal power in Alaska could generate as much as 16 TWh/yr of energy (about four times more than what Hoover Dam generates in an average year). In the Lower 48, the potential energy from tidal power is just a fraction of that (just 0.6 TWh/year from Puget Sound, for example). Considering that no tidal power plants in these areas have even been approved yet, it’s going to be several years, or even decades, before Americans can rely on tidal power for their electricity. But for some regions, DOE says the energy from tidal currents will help meet the goal of generating 80 percent of America's electricity from clean sources by 2035.
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Renewable Energy, Other sources of Renewable Energy - 0 views

www.altenergy.org/...other.html wave infrastructure
shared by dpurdy on 22 Oct 12 - No Cached
  • "Worldwide, approximately 3000 gigawatts (1 gigawatt = 1 GW = 1 billion watts) of energy is continuously available from the action of tides.
  • The best areas are on the eastern sides of the oceans (western side of the continents) between the 40 and 60 latitudes in both the northern and southern hemispheres.
  • While the "wave power at deep ocean sites is three to eight times the wave power at adjacent coastal sites," constructing and mooring the site and transmitting the electricity to shore would be prohibitively costly.
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  • There is a handful of wave energy demonstration plants operating worldwide, but none produces a significant amount of electricity.
  • dpurdy on 31 Oct 12
     
    While the "wave power at deep ocean sites is three to eight times the wave power at adjacent coastal sites," constructing and mooring the site and transmitting the electricity to shore would be prohibitively costly.
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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
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  • Power grids are facing a major transformation, driven by the need to integrate renewable energy
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Solar power - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/Solar_power solar pollution cost co2 sustainable convert history form current
shared by bondycal00 on 20 Sep 13 - Cached
  • The Life-cycle greenhouse-gas emissions of solar power are in the range of 22 to 46  g/kWh depending on if solar thermal or solar PV is being analyzed, respectively. With this potentially being decreased to 15 g/kWh in the future.[71] For comparison (of weighted averages), a combined cycle gas-fired power plant emits some 400-599 g/kWh,
  • bondycal00 on 26 Sep 13
     
    Solar power is the conversion of sunlight into electricity, either directly using photovoltaics (PV), or indirectly using concentrated solar power (CSP). Concentrated solar power systems use lenses or mirrors and tracking systems to focus a large area of sunlight into a small beam. Photovoltaics convert light into electric current using the photoelectric effect.
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Geothermal energy in the United States - Wikipedia, the free encyclopedia - 0 views

en.wikipedia.org/...al_energy_in_the_United_States current geothermal
shared by hardingmar00 on 12 Mar 13 - No Cached
  • knightoli99 on 12 Mar 13
     
    "eothermal energy in the United States continues to be an area of considerable activity. In 2012, the United States led the world in geothermal electricity production with 3,386 megawatts (MW) of installed capacity;[1][2] the largest group of geothermal power plants in the world is located at The Geysers, a geothermal field in California.[3] The United States generates an average of 15 billion kilowatt hours of geothermal power per year, comparable to burning some 25 million barrels (4,000,000 m3) of oil or 6 million short tons of coal per year.[4] Geothermal power plants are largely concentrated in the western states. They are the fourth largest source of renewable electricity, after hydroelectricity, biomass, and wind power. A geothermal resource assessment shows that nine western states together have the potential to provide over 20 percent of national electricity needs.[4][5]"
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Tidal Power - How Tidal Power Plants Work - 0 views

inventors.about.com/...tidal_power.htm tidal energy
shared by rascoekat00 on 11 Mar 13 - Cached
  • Tidal power traditionally involves erecting a dam across the opening to a tidal basin. The dam includes a sluice that is opened to allow the tide to flow into the basin; the sluice is then closed, and as the sea level drops, traditional hydropower technologies can be used to generate electricity from the elevated water in the basin. Some researchers are also trying to extract energy directly from tidal flow streams.
  • Another form of ocean energy is called tidal energy. When tides comes into the shore, they can be trapped in reservoirs behind dams. Then when the tide drops, the water behind the dam can be let out just like in a regular hydroelectric power plant.
  • kramerjac99 on 11 Mar 13
     
    How it works
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What Is Geothermal Energy? - 1 views

www.alternative-energy-resources.net/whatisgeothermalenergy.html geothermal
shared by knightoli99 on 03 Nov 11 - No Cached
  • What is geothermal energy? Simply put, it is energy from the Earth. Geo refers to the solid part of the Earth and thermal refers to heat energy. Anywhere the Earth's surface is in close proximity to magma or volcanic activity under or near the Earth's surface, we can harness the energy.
  • knightoli99 on 15 Mar 13
     
    "What is geothermal energy? Simply put, it is energy from the Earth. Geo refers to the solid part of the Earth and thermal refers to heat energy. Anywhere the Earth's surface is in close proximity to magma or volcanic activity under or near the Earth's surface, we can harness the energy. According to the Department of Energy,"Geothermal energy technologies use the heat of the earth for direct-use applications, geothermal heat pumps, and electrical power production. Resources of geothermal energy range from the shallow ground to hot water and hot rock found a few miles beneath the Earth's surface and down even deeper to the extremely high temperatures of molten rock called magma. Three power plant technologies are being used to convert hydrothermal fluids to electricity. The type of conversion used depends on whether the fluid is steam or water and its temperature."
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Wind Power - 0 views

www.renewableenergyworld.com/...wind-power wind sustainable current convert
shared by olsentri00 on 23 Sep 13 - Cached
  • We have been harnessing the wind's energy for hundreds of years. From old Holland to farms in the United States, windmills have been used for pumping water or grinding grain. Today, the windmill's modern equivalent - a wind turbine - can use the wind's energy to generate electricity.
  • Wind turbines, like windmills, are mounted on a tower to capture the most energy. At 100 feet (30 meters) or more aboveground, they can take advantage of the faster and less turbulent wind. Turbines catch the wind's energy with their propeller-like blades. Usually, two or three blades are mounted on a shaft to form a rotor.
  • A blade acts much like an airplane wing. When the wind blows, a pocket of low-pressure air forms on the downwind side of the blade. The low-pressure air pocket then pulls the blade toward it, causing the rotor to turn. This is called lift. The force of the lift is actually much stronger than the wind's force against the front side of the blade, which is called drag. The combination of lift and drag causes the rotor to spin like a propeller, and the turning shaft spins a generator to make electricity.
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  • Wind turbines can be used as stand-alone applications, or they can be connected to a utility power grid or even combined with a photovoltaic (solar cell) system. For utility-scale sources of wind energy, a large number of wind turbines are usually built close together to form awind plant. Several electricity providers today use wind plants to supply power to their customers.
  • kurishkri00 on 23 Sep 13
     
    Today, the windmill's modern equivalent - a wind turbine - can use the wind's energy to generate electricity.
  • olsentri00 on 24 Sep 13
     
    Today, the windmill's modern equivalent - a wind turbine - can use the wind's energy to generate electricity.
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Electricity from Geothermal Energy - 1 views

www.powerscorecard.org/tech_detail.cfm convert geothermal
shared by hardingmar00 on 14 Mar 13 - No Cached
  • The heat from the earth's own molten core can be converted into electricity. This core consists primarily of extremely high temperature liquid rock known as magma. This "geothermal" heat circulates within the rock or is transferred to underground reservoirs of water, which also circulate under the earth's crust. Because of the near limitless ability of the earth to produce magma, and the continuous transfer of heat between subsurface rock and water, geothermal energy is considered a renewable resource.
  • faglejoh98 on 14 Mar 13
     
    "The heat from the earth's own molten core can be converted into electricity. This core consists primarily of extremely high temperature liquid rock known as magma. This "geothermal" heat circulates within the rock or is transferred to underground reservoirs of water, which also circulate under the earth's crust. Because of the near limitless ability of the earth to produce magma, and the continuous transfer of heat between subsurface rock and water, geothermal energy is considered a renewable resource. Geothermal resources have been harnessed as an energy source since the dawn of civilization, when natural hot springs were first used for cooking and bathing. The geothermal resources tapped to generate electricity are far more intense than those used for space heating and can reside as deep as 10,000 feet below the earth's surface. Capital costs for the construction of geothermal power plants are much higher than for large coal-fired plants or new natural gas turbine technologies. But geothermal plants have reasonable operation and maintenance costs and no fuel costs. Though more expensive than wind power in most cases, new geothermal electricity generation facilities are increasingly competitive with fossil options."
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How Geothermal Energy Works | Union of Concerned Scientists - 1 views

www.ucsusa.org/...w-geothermal-energy-works.html geothermal sustainable
shared by knightoli99 on 11 Mar 13 - No Cached
  • Many regions of the world are already tapping geothermal energy as an affordable and sustainable solution to reducing dependence on fossil fuels, and the global warming and public health risks that result from their use. For example, more than 8,900 megawatts (MW) of large, utility-scale geothermal capacity in 24 countries now produce enough electricity to meet the annual needs of nearly 12 million typical U.S. households (GEA 2008a). Geothermal plants produce 25 percent or more of electricity in the Philippines, Iceland, and El Salvador.
  • parkergar99 on 11 Mar 13
     
    "The U.S. Department of Energy found that heat pumps can save a typical home hundreds of dollars in energy costs each year, with the system typically paying for itself in 8 to 12 years. Tax credits and other incentives can reduce the payback period to 5 years or less.10                                                  "
  • knightoli99 on 11 Mar 13
     
    "Heat from the earth can be used as an energy source in many ways, from large and complex power stations to small and relatively simple pumping systems. This heat energy, known as geothermal energy, can be found almost anywhere-as far away as remote deep wells in Indonesia and as close as the dirt in our backyards. FROM OUR BLOG The Latest on Renewable Energy from Our Experts and Analysts Will Clean Energy Research and Development Be Sequestered? Laura Wisland PTC Extension Already Making a Big Difference for Wind Steve Clemmer The Local Energy Movement: Coming to a Town Near You Laura Wisland Subscribe to the Energy blog feed Many regions of the world are already tapping geothermal energy as an affordable and sustainable solution to reducing dependence on fossil fuels, and the global warming and public health risks that result from their use. For example, more than 8,900 megawatts (MW) of large, utility-scale geothermal capacity in 24 countries now produce enough electricity to meet the annual needs of nearly 12 million typical U.S. households (GEA 2008a). Geothermal plants produce 25 percent or more of electricity in the Philippines, Iceland, and El Salvador."
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What are the advantages and disadvantages of alternative tidal power as an energy source - 1 views

wiki.answers.com/...idal_power_as_an_energy_source tidal energy
shared by tavarreskat99 on 12 Mar 13 - No Cached
  • Advantages: Tidal energy is an alternative energy. The energy produced is clean and non polluting. There is no carbon dioxide or any other by-products released. It produces no greenhouse gases or other waste.It is a renewable energy that will help reduce our reliance on the burning of fossil fuels. There are two tides every day and they can be relied on. The energy is there for the taking.So the electricity supply is constant and efficient.Once you've built it, the energy is free because it comes from the ocean's powerIt needs no fuel.It produces electricity reliably.Not expensive to maintain.Tides are definitely predictable. There are two tides every day and they can be relied on. So the electricity supply is constant. Offshore turbines and vertical-axis turbines are not ruinously expensive to build and do not have a large environmental impact.A plant is expected to be in production for 75 to 100 yearsUses an abundant, inexpensive fuel source (water) to generate powerMay protect coastline against damage from high storm tides and provide a ready-made road bridge
  • Holding back the tide allows silt to build up on the river bed.The dams and barrages sometimes interfere with shipping. You will need to find a way to connect the electricity to the grid.Pose same threats as large dams, altering the flow of saltwater in and out of estuaries, which changes the hydrology and salinity and possibly negatively affects the marine mammals that use the estuaries as their habitatTurbidity decreases as a result of smaller volume of water being exchanged between the basin and the sea.The average salinity inside the basin decreases, also affecting the ecosystemA barrage across an estuary is very expensive to build, and affects a very wide area - the environment is changed for many miles upstream and downstream. Many birds rely on the tide uncovering the mud flats so that they can feed.There are few suitable sites for tidal barrages.Only provides power for around 10 hours each day, when the tide is actually moving in or out.
  • It only provides about 7% of the power needed for England and Wales that means that some people get their energy close to free and some pay a lot of moneyWater is not replenished, it cannot flow away so any dirt or pollution lingers around the coast much longerNeeds a very big piece of sea to be cost effectiveCannot be used inlandBarrage systems require salt resistant parts and lots of maintenanceAffects the lives of the people who rely on fishing for a means of livingLimited because the tide never speeds up or slows down, and occurs on 6 hour cycles. It is also dependent on the fetch distance. The fetch is the distance the tide rises and falls, so some beaches have a very small fetch, and others have a big fetch but hardly any have a large enough fetch to support tidal energy
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EIA Energy Kids - Solar - 2 views

www.eia.gov/...energy.cfm solar what location pollution how history sustainable
shared by dpurdy on 03 Nov 11 - No Cached
  • Energy from the Sun The sun has produced energy for billions of years.  Solar energy is the sun’s rays (solar radiation) that reach the Earth. This energy can be converted into other forms of energy, such as heat and electricity.
  • Photovoltaic (PV devices) or “solar cells” change sunlight directly into electricity. Individual PV cells are grouped into panels and arrays of panels that can be used in a wide range of applications ranging from single small cells that charge calculator and watch batteries, to systems that power single homes, to large power plants covering many acres.
  • Solar energy systems do not produce air pollutants or carbon-dioxide
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  • Solar energy is by far the Earth's most available energy source. Solar power is capable of providing many times the total current energy demand. But it is an intermittent energy source, meaning that it is not available at all times.
  • Photons Carry Solar Energy Sunlight is composed of photons, or particles of solar energy. These photons contain various amounts of energy corresponding to the different wavelengths of the solar spectrum. When photons strike a photovoltaic cell, they may be reflected, pass right through, or be absorbed. Only the absorbed photons provide energy to generate electricity. When enough sunlight (energy) is absorbed by the material (a semiconductor), electrons are dislodged from the material's atoms. Special treatment of the material surface during manufacturing makes the front surface of the cell more receptive to free electrons, so the electrons naturally migrate to the surface.
  • Weather Affects Photovoltaics The performance of a photovoltaic array is dependent upon sunlight. Climate conditions (such as clouds or fog) have a significant effect on the amount of solar energy received by a photovoltaic array and, in turn, its performance.
  • History of the Photovoltaic Cell The first practical photovoltaic (PV) cell was developed in 1954 by Bell Telephone researchers examining the sensitivity of a properly prepared silicon wafer to sunlight. Beginning in the late 1950s, PV cells were used to power U.S. space satellites. PV cells were next widely used for small consumer electronics like calculators and watches and to provide electricity in remote or "off-grid" locations were there were no electric power lines. Technology advances and government financial incentives have helped to greatly expand PV use since the mid-1990s.
  • Using solar energy produces no air or water pollution and no greenhouse gases, but does have some indirect impacts on the environment.
  • 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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Renewable Energy Sources in the United States - 0 views

www.nationalatlas.gov/...a_energy.html geothermal current
shared by faglejoh98 on 12 Mar 13 - No Cached
  • Flash steam plants are the most common type of geothermal power plants in operation today. They use extremely hot water (above 300 degrees F (149 degrees C)), which is pumped under high pressure to the generation equipment at the surface. The hot Estimated subterranean temperatures at a depth of 6 kilometers.water is vaporized and the vapor in turn drives turbines to generate electricity
  • While geothermal energy use is efficient, reliable, and environmentally friendly, it currently meets less than 1% of U.S. power needs.
  • While geothermal energy use is efficient, reliable, and environmentally friendly, it currently meets less than 1% of U.S. power needs.
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Five Reasons Why Tidal Energy is the Wave of the Future - Green Living Ideas - 3 views

greenlivingideas.com/...ergy-is-the-wave-of-the-future tide future co2 pollution
shared by rodriguezjos99 on 11 Mar 13 - No Cached
  • Green energy has never been more important than it is today with the looming threat of global warming. Every possible effort must be made to reverse the worldwide threat of climate change by subsidizing and switching to green energy. One often-overlooked source of clean, renewable energy comes not from solar, wind or geothermal power, but from the tides.
  • Tidal Energy is valuable to environmentalists because unlike fossil fuels the source of energy will not be depleted in the foreseeable future no matter how much energy is collected.
  • The collection of tidal energy is clean because it involves very little emission of carbon dioxide and other greenhouse gases
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  • The pattern of tides is extremely stable and not strongly affected by weather conditions which suggests that it would be a very stable source of green energy.
  • Moving water can exert a much greater force on a turbine than wind which means the turbine can turn slowly and still produce a great deal of electricity. The slow and stable tidal forces are ideal parameters for engineering energy solutions. The fact that the turbines can be slow-moving makes it easier to avoid interfering with local ecosystems
  • While the initial cost of building tidal energy plants is high, the plants are expected to run for a very long time which will make them more cost-effective in the long run
  • rodriguezjos99 on 13 Mar 13
     
    "Five Reasons Why Tidal Energy is the Wave of the Future JANUARY 4, 2013 BY GUEST CONTRIBUTOR LEAVE A COMMENT Join GLI's 10,000 other followers on Twitter! Green energy has never been more important than it is today with the looming threat of global warming. Every possible effort must be made to reverse the worldwide threat of climate change by subsidizing and switching to green energy. One often-overlooked source of clean, renewable energy comes not from solar, wind or geothermal power, but from the tides. 1. Tidal Energy is Renewable Tidal Energy is valuable to environmentalists because unlike fossil fuels the source of energy will not be depleted in the foreseeable future no matter how much energy is collected. The gravitational relationship between the Earth and the moon is extremely stable in the long term just like solar, wind and geothermal energy. 2. Tidal Energy is Green The collection of tidal energy is clean because it involves very little emission of carbon dioxide and other greenhouse gases. However, the marine ecosystem is fragile and great care must be taken to avoid interfering with the lives of organisms that depend on the tide."
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Where is tidal power being used to generate electricity - 0 views

wiki.answers.com/...g_used_to_generate_electricity tide power convert electricity
shared by rascoekat00 on 19 Mar 13 - No Cached
  • Barrage systems. This system, built like a dam across a river, holds back the water till the tide has gone out, then uses the potential energy of the water to turn turbines in the barrage. This is an expensive system with many disadvantages.
  • Tidal Stream systems. This consists of using turbines, rather like wind turbines, to use the kinetic power of the moving water to generate electricity. This is easier and cheaper to install.
  • There are three Barrage systems operating throughout the world. One large 240 MW plant on the Rance River in France, and two small plants, one in the Bay of Fundy in Canada, and another in Kislaya Guba in Russia.
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Montana Environmental Information CenterCost of Wind vs. Fossil Fuels - MEIC - 0 views

meic.org/...cost-of-wind-vs-fossil-fuels wind cost
shared by cottonetar98 on 22 Oct 12 - No Cached
  • Wind energy is cost-competitive with fossil fuels, especially coal. In Montana, wind energy is less expensive than coal for NorthWestern Energy--the state's largest utility.
  • ccording to the EIA, the total cost of wind energy without federal tax and other financial incentives is about 9.7 cents/kilowatt-hour. The total cost of conventional coal without federal tax and other financial incentives is about 9.4 cents/kilowatt-hour.
  • here are integration costs associated with intermittent renewable energy but unlike fossil fuels, wind (and solar and many other renewables) the fuel price stays the same: Zero.  Plus, wind-power technology has rapidly evolved. Turbines are much larger, growing from an average of 1.2 megawatts to 1.6 megawatts (a 33% increase in average capacity) in just three years.
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  • When comparing the cost of wind vs. fossil fuels its important to consider  fuel costs, integration costs, operating costs, and the cost of tax incentives. Wind energy is cost-competitive with fossil fuels, especially coal. In Montana, wind energy is less expensive than coal for NorthWestern Energy--the state's largest utility. The graph below from the Montana Public Service Commission, compares the costs of various resources in NorthWestern's portfolio. Judith Gap wind facility is about $47.00/Megawatt-hour (or 4.7 cents/kilowatt-hour) and Colstrip Unit 4 is $68.00/Megawatt-hour or (6.8 cents/kilowatt hour).
  • Today's typical new turbine has a 2.3-megawatt capacity; 7-megawatt turbines will be available soon.  The newer turbines can wring more electric power out of the wind (especially at lower wind speeds) than older turbines could. The combination of greater output and greater capacity nearly offsets the materials and labor cost increases plaguing traditional resources.
  • mcdermottaar99 on 11 Mar 13
     
    wind to fossil fuels 
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