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.
Where is tidal power being used to generate electricity - 0 views
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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.
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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.
Biofuels - NYS Dept. of Environmental Conservation - 0 views
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y growing plants can be achieved by producing biofuels from
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Balance between the carbon released by biofuels and carbon uptake by growing plants can be achieved by producing biofuels from feedstocks (raw materials) that come from managed forests or sustainably cultivated crops.
Sustainability Standards « biofuelwatch - 0 views
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Biofuelwatch has released a new report, ‘Sustainable Biomass: A Modern Myth’. It explores the certification companies certifying biomass as sustainable, the UK government’s proposed sustainability criteria for biomass, and developer’s ‘promises’ to source sustainable biomass.
Geothermal Energy | A Student's Guide to Global Climate Change | US EPA - 0 views
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Geothermal power plants, which use heat from deep inside the Earth to generate steam to make electricity. Geothermal heat pumps, which tap into heat close to the Earth's surface to heat water or provide heat for buildings.
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At a geothermal power plant, wells are drilled 1 or 2 miles deep into the Earth to pump steam or hot water to the surface.
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hot springs, geysers, or volcanic activity, because these are places where the Earth is particularly hot just below the surface.
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geothermal CO2 emissions - 0 views
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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.
Geothermal Energy - 3 views
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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.
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Hot water near the surface of Earth can be used directly for heat.
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Wells can be drilled into underground reservoirs for the generation of electricity. Some geothermal power plants use the steam from a reservoir to power a turbine/generator, while others use the hot water to boil a working fluid that vaporizes and then turns a turbine.
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"Geothermal energy is the heat from the Earth. It's clean and sustainable. 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."
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"Geothermal energy is the heat from the Earth. It's clean and sustainable. 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."
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"Geothermal energy is the heat from the Earth. It's clean and sustainable. 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."
Geothermal | Department of Energy - 0 views
wind enrgy - 1 views
What is U.S. electricity generation by energy source? - FAQ - U.S. Energy Information A... - 1 views
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What is U.S. electricity generation by energy source? In 2012, the United States generated about 4,054 billion kilowatthours of electricity. About 68% of the electricity generated was from fossil fuel (coal, natural gas, and petroleum), with 37% attributed from coal. Energy sources and percent share of total electricity generation in 2012 were: Coal 37% Natural Gas 30% Nuclear 19% Hydropower 7% Other Renewable 5% Biomass 1.42% Geothermal 0.41% Solar 0.11% Wind 3.46% Petroleum 1% Other Gases < 1%
Wave & Tidal Energy Technology | Renewable Northwest Project - 0 views
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Potential
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Wave energy resources are best between 30º and 60º latitude in both hemispheres, and the potential tends to be the greatest on western coasts
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While no commercial wave or tidal projects have yet been developed in the United States, several projects are planned for the near future, including projects in the Northwest
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Solar power in the United States - Wikipedia, the free encyclopedia - 0 views
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Solar potential from very large scale solar power plants State Land used (sq mi) Potential (GWp) Annual generation (TWh) Arizona 19,279 2,468 5,837 California 6,853 877 2,075 Colorado 2,124 272 643 Nevada 5,589 715 1,692 New Mexico 15,156 1,940 4,588 Texas 1,162 149 351 Utah 3,564 456 1,079
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6,877
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Total generation in the United States is about 3,800 TWh.[11]
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Towards a Just and Sustainable Solar Industry - Silicon Valley Toxics Coalition - 0 views
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Although solar panels provide clean energy while in use, a variety of factors during the manufacturing and disposal of these panels have the potential to greatly damage the environment.
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The most commonly used solar panels are silicon-based panels that share many of the same materials and manufacturing processes as semiconductors. Solar panels have the potential to create an e-waste burden if the proper infrastructure is not developed before the first wave of panels begins to come down.
A Pollution-Free Hydrogen Economy? Not So Soon | MIT Technology Review - 0 views
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There’s a much cheaper way to produce hydrogen: spray steam on white-hot coals and out comes mostly hydrogen gas (40 percent) and carbon monoxide (50 percent), a mixture known appropriately as “water gas.” It’s the least expensive way to make hydrogen. Unfortunately, the carbon monoxide produced along with it is highly poisonous. To extract the last bit of energy, the carbon monoxide can be burned, and that turns it into the greenhouse gas carbon dioxide.
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Electric cars powered by hydrogen fuel cells don’t produce greenhouse-enhancing carbon dioxide. But producing hydrogen does-and if we want to reduce our petroleum dependence, we’re going to have to reconcile ourselves to that fact.
Wind power - Wikipedia, the free encyclopedia - 1 views
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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
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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.
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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
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wind turbine stuff
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"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."
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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]
Devices that Harness Wave Energy | Wave Energy Cost - 2 views
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Wave energy is an irregular and oscillating low-frequency energy source that can be converted to a 60-Hertz frequency
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Kinetic energy, the energy of motion, in waves is tremendous. An average 4-foot, 10-second wave striking a coast puts out more than 35,000 horsepower per mile of coast.
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It varies in intensity, but it is available twenty-four hours a day, 365 days a year.
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Where Does Geothermal Energy Come From - 0 views
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bounadaries and faults are cracks in the Earth’s crust where magma rises near or to the surface. Geothermal plants take advantage of this fact using water heated by this volcanic activity to produce electric power.
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The best part is that it is clean energy. There is no way it can produce pollution that can harm the environment
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