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What are the advantages and disadvantages of solar energy - 0 views

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    "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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Biofuel crops may worsen global warming: study - CTV News - 0 views

  • "Our study found that any biofuel that causes clearing of natural ecosystems will increase global warming," Joe Fargione, a scientist for The Nature Conservancy, told CTV.ca.
  • He said converting natural areas into croplands results in tons of carbon being emitted into the atmosphere -- a carbon 'debt' that outweighs any benefits.
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Hydrogen economy - Wikipedia, the free encyclopedia - 0 views

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    "The hydrogen economy is a proposed system of delivering energy using hydrogen. The term hydrogen economy was coined by John Bockris during a talk he gave in 1970 at General Motors (GM) Technical Center.[1] Hydrogen advocates promote hydrogen as a potential fuel for motive power[2] (including cars and boats), the energy needs of buildings and portable electronics. Free hydrogen does not occur naturally in quantity, but can be generated by steam reformation of hydrocarbons, water electrolysis or by other methods. Hydrogen is thus an energy carrier (like a battery), not a primary energy source (like coal). The feasibility of a hydrogen economy depends on issues of electrolysis, energy sourcing, including fossil fuel use, climate change, and sustainable energy generation."
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Advantages of Geothermal Energy - 0 views

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    "Pollution free production of energy. Since geothermal energy does not require fossil fuels to be burned, production of electricity using this type of energy can be considered as pollution free. Sometimes, there is the tendency that this could release some harmful gases from beneath the earth that might actually be harmful. However, these gases could be contained."
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What is tidal energy - How tidal works? - Tidal energy - 0 views

  • tidal energy uses tidal strength of water and back and forth movement  in seas, rivers or oceans. Tidal power exploits kinetic energy of water that power water turbines with its movement between the wings which rotate the turbine to produce electricity.
  • For producing significant amount of energy out of tidal water turbines, range of tides should be high and substantial amount of water should be there for pushing water through the turbine.
  • It is significantly important to spot the appropriate place which provide suitable and sustainable conditions to produce tidal energy, there are plenty of places around the globe which provide good conditions for installing water turbines and then produce electricity use tidal power of oceans in the location.
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  • Once tidal power plant is built its’ electricity is free. It does not emit greenhouse gasses, carbon emission gasses which pollute environment. It does not have any dependency of any fossil fuel including furnace oil, gasses, etc; it needs no oil what so ever to produce electricity. Tidal power technology is renewable energy, which uses tidal and waves of same water for producing electricity over and over again. Tidal power technology like all renewable energy is clean energy and does not leave much impact on environment. Tidal power plants does not require much maintenance, therefore it is maintenance cost free. Tidal energy stations have about 80 % efficiency ratio, where as fossil fuel have approximately 30 % for efficiency levels. Tides in oceans are very predictable, its easy to judge when strong tides are going to show up from water consider weather and other conditions. The better tides and wave strengths of the oceans is, improved the efficiency of the station is. Electricity does not fluctuate on large scale using tidal energy as it happens in solar power technology.
  • Electricity can only be produced when tides are high in the sea, once ocean is calm and does not flow certain level of waves, it cannot produce electricity. Therefore electricity can be produced for only 10 hrs a day in presence of tides.
  • Tidal power plants are not cost effective. Millions of dollars are utilized for developing tidal power which could provide electricity in Megawatts.
  • Once tidal power plant is built its’ electricity is free. It does not emit greenhouse gasses, carbon emission gasses which pollute environment. It does not have any dependency of any fossil fuel including furnace oil, gasses, etc; it needs no oil what so ever to produce electricity. Tidal power technology is renewable energy, which uses tidal and waves of same water for producing electricity over and over again. Tidal power technology like all renewable energy is clean energy and does not leave much impact on environment. Tidal power plants does not require much maintenance, therefore it is maintenance cost free. Tidal energy stations have about 80 % efficiency ratio, where as fossil fuel have approximately 30 % for efficiency levels. Tides in oceans are very predictable, its easy to judge when strong tides are going to show up from water consider weather and other conditions. The better tides and wave strengths of the oceans is, improved the efficiency of the station is. Electricity does not fluctuate on large scale using tidal energy as it happens in solar power technology.
  • not appropriate to risk £15 millions worth of money. This is the main reason why this project is yet start
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Wave power - Wikipedia, the free encyclopedia - 2 views

  • 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
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  • 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
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My Library for wind - 0 views

  • One of the most important is that wind power is the least expensive of all other forms of alternative energy.  Wind turbines generate electricity at around 5 cents per kWh (Kilowatt Hour), which is comparable to the new coal and/or oil burning power plants.  The costs are projected to decline even more as technology improves, and this is very important because most of the cost with wind power is in manufacturing.  Once the wind turbines are in place there is little cost to maintain and wind power is free.
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    "One of the most important is that wind power is the least expensive of all other forms of alternative energy.  Wind turbines generate electricity at around 5 cents per kWh (Kilowatt Hour), which is comparable to the new coal and/or oil burning power plants.  The costs are projected to decline even more as technology improves, and this is very important because most of the cost with wind power is in manufacturing.  Once the wind turbines are in place there is little cost to maintain and wind power is free."
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Energy Resources: Wave power - 3 views

  • Waves are a powerful source of energy.
  • The problem is that it's not easy to harness this energy and convert it into electricity in large amounts.
  • wave power stations are rare
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  • Once you've built a wave power station, the energy is free, needs no fuel and produces no waste or pollution
  • The energy is free - no fuel needed, no waste produced.
  • Not expensive to operate and maintain.
  • Can produce a great deal of energy.
  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem.
  • Ocean waves are caused by the wind as it blows across the sea. Waves are a powerful source of energy.
  • Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem
  • At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator. A problem with this design is that the rushing air can be very noisy, unless a silencer is fitted to the turbine. The noise is not a huge problem anyway, as the waves make quite a bit of noise themselves.
  • At a wave power station, the waves arriving cause the water in the chamber to rise and fall, which means that air is forced in and out of the hole in the top of the chamber. We place a turbine in this hole, which is turned by the air rushing in and out. The turbine turns a generator. A problem with this design is that the rushing air can be very noisy, unless a silencer is fitted to the turbine. The noise is not a huge problem anyway, as the waves make quite a bit of noise themselves.
  • A company called Pelamis Wave Power are developing a method of offshore wave energy collection, using a floating tube called "Pelamis"
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    " Advantages   The energy is free - no fuel needed, no waste produced. Not expensive to operate and maintain. Can produce a great deal of energy. Disadvantages Depends on the waves - sometimes you'll get loads of energy, sometimes almost nothing. Needs a suitable site, where waves are consistently strong. Some designs are noisy. But then again, so are waves, so any noise is unlikely to be a problem. Must be able to withstand very rough weather."
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    One of them works like a swimming pool wave machine in reverse. At a swimming pool, air is blown in and out of a chamber beside the pool, which makes the water outside bob up and down, causing waves.  
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Is Current Wind Growth Sustainable? | Renewable Energy World Magazine Article - 0 views

  • 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.
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  • 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.
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    "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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HowStuffWorks "How the Hydrogen Economy Works" - 0 views

  • The elimination of pollution caused by fossil fuels - When hydrogen is used in a fuel cell to create power, it is a completely clean technology. The only byproduct is water. There are also no environmental dangers like oil spills to worry about with hydrogen. The elimination of greenhouse gases - If the hydrogen comes from the electrolysis of water, then hydrogen adds no greenhouse gases to the environment. There is a perfect cycle -- electrolysis produces hydrogen from water, and the hydrogen recombines with oxygen to create water and power in a fuel cell. The elimination of economic dependence - The elimination of oil means no dependence on the Middle East and its oil reserves. Distributed production - Hydrogen can be produced anywhere that you have electricity and water. People can even produce it in their homes with relatively simple technology.
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Wave Energy Wave Power Clean Renewable Electricity Generation - Wavegen - 1 views

  • Ocean waves are a tertiary form of solar energy, in that unequal heating of the Earth’s surface generates wind, and wind blowing over water generates waves. Despite the fact that nearly 75% of the Earth’s surface is covered with water, waves are a largely unexplored source of energy, compared with the progress that has been made in harnessing the sun and wind.
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OWECO By Others - 1 views

  • ocean waves is long considered substantive kinetic resource
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EIA Energy Kids - Hydropower - 1 views

  • Tides are caused by the gravitational pull of the moon and sun, and the rotation of the Earth. Near shore, water levels can vary up to 40 feet due to tides. Dam of the Tidal Power Plant on the Estuary of the Rance River, Bretagne, France Source: Stock photography (copyrighted) Tidal power is more predictable than wind energy and solar power. A large enough tidal range — 10 feet — is needed to produce tidal energy economically.
  • The United States has no tidal plants and only a few sites where tidal energy could be produced economically. France, England, Canada, and Russia have much more potential to use this type of energy.
  • Tidal turbines are basically wind turbines in the water that can be located anywhere there is strong tidal flow. Because water is about 800 times denser than air, tidal turbines have to be much sturdier than wind turbines. Tidal turbines are heavier and more expensive to build but capture more energy.
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  • Waves are caused by the wind blowing over the surface of the ocean. There is tremendous energy in the ocean waves. It's estimated that the total potential off the coasts of the United States is 252 billion kilowatthours a year, about 6% of the United States' electricity consumption in 2010. The west coasts of the United States and Europe and the coasts of Japan and New Zealand are good sites for harnessing wave energy.
  • Many more ways to capture wave energy are currently under development. Some of these devices being developed are placed underwater, anchored to the ocean floor, while others ride on top of the waves. The world's first commercial wave farm using one such technology opened in 2008 at the Aguçadora Wave Park in Portugal.
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RenewableUK - Where Does Tidal Energy Come From? - 0 views

shared by dpurdy on 03 Nov 11 - No Cached
  • Where Does Tidal Energy Come From? The gravitational force of the Earth stops the ocean from floating off into space, just like everything else. The Moon also has a very weak gravitational effect on the Earth, which is not normally noticable as far as falling teacups are concerned, but the ocean, which can flow around the globe to even out differences, is noticably affected.
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Biomass Energy Home Page Biomass Energy: Cost of Production - 0 views

  • The cost of producing ethanol varies with the cost of the feedstock used and the scale of production. Approximately 85 percent of ethanol production capacity in the United States relies on corn feedstock. The cost of producing ethanol from corn is estimated to be about $1.10 per gallon.
  • Because a gallon of ethanol contains less energy than a gallon of gasoline, the production cost of ethanol must be multiplied by a factor of 1.5 to make an energy-cost comparison with gasoline. This means that if ethanol costs $1.10 per gallon to produce, then the effective cost per gallon to equal the energy contained in a gallon of gasoline is $1.65. In contrast, the current wholesale price of gasoline is about 90 cents per gallon.
  • A major hurdle facing commercial biodiesel production is the cost of producing the fuel. Vegetable oil seed procurement, transport, storage and oil extraction accounts for at least 75 percent of the cost of producing biodiesel. The cost varies depending on the feedstock used. For example, based on the market price for industrial rapeseed grown in Washington and Idaho, the estimated cost of producing biodiesel is $2.56 per gallon of rapeseed methyl ester. Recent estimates put the cost of production in the range of $1.30 per gallon (using waste grease feedstock) to $2.00 or more per gallon using soybean oil.
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Customer Feedback for Diigo - 1 views

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Solar panel royalty free stock photograph - 1 views

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What are the advantages and disadvantages of alternative tidal power as an energy source - 1 views

  • 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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Wave Power - 1 views

  • Wave power does not cause any greenhouse gases and is a form of renewable energy as we will simply never run out of waves.Even though equipment represents a considerable financial commitment, the fuel is free of charge and never limited by geopolitical borders. Finally, the damage to the natural environment is considered to be minimal and thus it will help stop climate change.
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    "Wave power does not cause any greenhouse gases and is a form of renewable energy as we will simply never run out of waves. Even though equipment represents a considerable financial commitment, the fuel is free of charge and never limited by geopolitical borders. Finally, the damage to the natural environment is considered to be minimal and thus it will help stop climate change."
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Solar electricity PV (photovoltaic) panels explained - benefits, costs, savings, earnin... - 1 views

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    "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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