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sokolkyl00

When Solar Becomes Cheaper Than Fossil Fuels | azizonomics - 0 views

azizonomics.com/...omes-cheaper-than-fossil-fuels

solar cost

shared by sokolkyl00 on 30 Sep 13 - No Cached
  • If the trend continues for another 8-10 years, which seems increasingly likely, solar will be as cheap as coal with the added benefit of zero carbon emissions. If the cost continues to fall over the next 20 years, solar costs will be half that of coal.
  • When applied to electricity prices this predicts that solar generated electricity in the US will descend to a level of 12 cents (7 pence) per kilowatt hour by 2020, possibly even 2015 for the sunniest parts of America.
blackmerbru98

fossil fuels BP - 0 views

BP Alternative Energy is focusing on those sectors of the energy industry where we can profitably grow our business. This has led us to focus on wind and biofuels, businesses that are material, sca...

wind solar fuel cell biofuel pollution fossil fuels

started by blackmerbru98 on 03 Oct 13 no follow-up yet
hardingmar00

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."
streetscor99

Fuel cells, what is a fuel cell, disadvantages, benefits - 0 views

www.altenergy.org/...fuel_cells.html

fossil fuels fuel cell disadvantages

shared by streetscor99 on 11 Mar 13 - Cached
  • * Because there is no combustion in a fuel cell, fuel is converted to electricity more efficiently than any other electrical generating technology available today. * There are no moving parts in a fuel cell stack, making them more reliable and quieter than generators. Even the ancillary systems (fans, pumps, controls, etcetera) in a complete fuel cell unit are relatively mature and simple technologies that should prove extremely reliable.
  • In the past, fuel cells were large and extremely expensive to manufacture, just as the first calculators and computers were. But, just like these products, the cost of fuel cells will quickly come down to consumer-affordable levels with mass production. We are currently in a transition period now, where many fuel cell companies are investing literally hundreds of millions of dollars to gear up for mass manufacturing at the same time they are trying to begin to develop a variety of markets for their product.
deepat00

Where Does Geothermal Energy Come From - 0 views

www.universetoday.com/...es-geothermal-energy-come-from

geothermal co2 fossil fuels

shared by deepat00 on 11 Mar 13 - No Cached
  • 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.
  • The best part is that it is clean energy. There is no way it can produce pollution that can harm the environment
  • hardingmar00 on 23 Sep 13
     
    where geothermal energy comes from
boothreb99

Hydrogen's Dirty Secret | Mother Jones - 0 views

www.motherjones.com/...hydrogens-dirty-secret

_ fuel cell pollution co2

shared by boothreb99 on 11 Mar 13 - No Cached
  • boothreb99 on 11 Mar 13
     
    "Such a system, experts say, would effectively eliminate most of the benefits offered by hydrogen. Although the fuel-cell cars themselves may emit nothing but water vapor, the process of producing the fuel cells from hydrocarbons will continue America's dependence on fossil fuels and leave behind carbon dioxide, the primary cause of global warming."
deepat00

Geothermal energy facts - Interesting energy facts - 0 views

interestingenergyfacts.blogspot.com/...geothermal-energy-facts.html

geothermal history

shared by deepat00 on 12 Mar 13 - No Cached
  • Geothermal energy supplies less than 10 % of the world's energy.
  • Geothermal energy is clean and safe for the surrounding environment.
  • Geothermal energy is sustainable because hot water can be re-injected into the ground.
  • ...11 more annotations...
  • Geothermal energy can be found in the form of volcanoes, hot springs and geysers.
  • Geothermal energy's advantage is also the fact that geothermal power stations are relatively small, and have a lesser impact on the environment than for instance hydroelectric plants.
  • Geothermal energy use has very low emissions of greenhouse gases to about three percent of the carbon dioxide emissions of a fossil power station.
  • Geothermal energy is extremely efficient (almost 100 %) energy source where only real source of losing energy is from turbine friction.
  • Geothermal energy has three main uses: Heating, Electricity generation and Geothermal heat pumps.
  • Geothermal energy's amount of electricity is less than 1 percent of total electricity produced in the USA.
  • Geothermal energy is giving 18 % of Iceland's total electricity.
  • Geothermal energy could produce 10 percent of US electricity by the year 2050.
  • Geothermal energy is used since ancient times in form of hot water.
  • Geothermal energy could supply US with more than 30,000 MW of power by 2025.
  • Geothermal energy has minimum negative environmental impact.
  • anonymous on 03 Oct 13
     
    Comprehensive up-to-date news coverage, aggregated from sources all over theworld by Google News.‎Finance - ‎About Google News - ‎Languages and regions - ‎Editors' Pickswww.killdo.de.ggNews Online from Australia and the World ...News headlines from Australia and the world. The latest national, world, business, sport, entertainment and technology news from News Limited news papers.www.killdo.de.ggBreaking News Updates | Latest News Headlines ...Breaking News, Latest News and Current News from FOXNews.com. Breakingnews and video. Latest Current News: U.S., World, Entertainment, Health, ...www.killdo.de.gg
carusonepay99

Wind energy FAQ | EWEA - 0 views

www.ewea.org/...wind-energy-faq

wind climate change

shared by carusonepay99 on 12 Mar 13 - No Cached
  • Each year we release millions of tonnes of carbon dioxide by burning fossil fuels (oil, coal and gas). In 2010, on average, every single EU citizen emitted 9.4 tonnes of CO2 – that’s enough to fill ten three-storey buildings. For every kWh of wind energy that you use, you will save approximately 696g of CO2. EWEA estimates that wind energy avoided the emission of 140 million tonnes of CO2 in 2011 in the EU, equivalent to taking 33% of cars in the EU – 71 million vehicles – off the road. This avoided CO2 costs of around €3.5 billion (assuming a price of €25/t CO2). Choosing how your electricity is produced plays an important role in protecting the climate: it’s easy to switch to a green power provider; you request the change and your current and future providers will organise it themselves.
hayespay99

How long have people been using solar energy - 1 views

wiki.answers.com/...people_been_using_solar_energy

solar history convert form energy

shared by hayespay99 on 12 Mar 13 - No Cached
  • It depends what you mean by "solar energy." Humans have always used solar energy in some sense: to warm themselves, to grow food, etc. However, I'm assuming that's not really what you mean (although it is important to realize that all energy on earth, with the exception of nuclear fission and geothermal, is ultimately driven by the sun's energy -- even fossil fuels, which after all were plants that grew with sunlight millions of years ago). Solar power has been used directly in various forms for over 100 years.
wellsann99

The Most Frequently Asked Questions about Wind Energy - 0 views

www.culturechange.org/wind.htm

fossil fuels pollution

shared by wellsann99 on 12 Mar 13 - No Cached
  • In 1997, U.S. power plants emitted 70% of the sulfur dioxide, 34% of carbon dioxide, 33% of nitrogen oxides, 28% of particulate matter and 23% of toxic heavy metals released into our nation's environment, mostly the air. These figures are currently increasing in spite of efforts to roll back air pollution through the federal Clean Air Act.
  • wellsann99 on 12 Mar 13
     
    wind power technology
stockmanchl99

Information about Biofuel, what is Biofuel, renewable energy solutions, Ethanol uses - 0 views

www.biofuelwatch.org

biofuel

shared by stockmanchl99 on 12 Mar 13 - No Cached
  • Basically biofuel is produced by using ethanol from naturally grown plant matter which allows for a more sustainable and environmentally friendly earth.
  • Bio fuel is a natural alternative from other fossil fuels and is attained from living or biological material that has just died. Basically biofuel is produced by using ethanol from naturally grown plant matter which allows for a more sustainable and environmentally friendly earth. To assist in the manufacturing of biofuel, the plants and plant-derived materials that contribute to its formation includes corn, corn cob, sugar cane, soybeans, flaxseed, rapeseed, vegetable oils, waste cooking oils, animal fats, tall oil and even cow manure. However, at present the most widely used source of bioeenergy is of course wood.
tavarreskat99

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
faglejoh98

Geothermal Energy Information, Geothermal Power Facts - National Geographic - 0 views

environment.nationalgeographic.com/...geothermal-profile

geothermal sustainable

shared by faglejoh98 on 08 Mar 13 - No Cached
  • Geothermal energy has been used for thousands of years in some countries for cooking and heating. It is simply power derived from the Earth's internal heat.This thermal energy is contained in the rock and fluids beneath Earth's crust. It can be found from shallow ground to several miles below the surface, and even farther down to the extremely hot molten rock called magma.These underground reservoirs of steam and hot water can be tapped to generate electricity or to heat and cool buildings directly.A geothermal heat pump system can take advantage of the constant temperature of the upper ten feet (three meters) of the Earth's surface to heat a home in the winter, while extracting heat from the building and transferring it back to the relatively cooler ground in the summer
  • There are three types of geothermal power plants: dry steam, flash, and binary. Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine. Flash plants pull deep, high-pressure hot water into cooler, low-pressure water. The steam that results from this process is used to drive the turbine. In binary plants, the hot water is passed by a secondary fluid with a much lower boiling point than water. This causes the secondary fluid to turn to vapor, which then drives a turbine. Most geothermal power plants in the future will be binary plants.
  • It can be extracted without burning a fossil fuel such as coal, gas, or oil. Geothermal fields produce only about one-sixth of the carbon dioxide that a relatively clean natural-gas-fueled power plant produces.
  • ...1 more annotation...
  • wer plants: dry steam, flash, and binary. Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine. Flash plants
  • behanjos99 on 08 Mar 13
     
    good info.
  • vanierfel98 on 11 Mar 13
     
    Geothermal energy doesn't release much CO2
  • faglejoh98 on 12 Mar 13
     
    "There are three types of geothermal power plants: dry steam, flash, and binary. Dry steam, the oldest geothermal technology, takes steam out of fractures in the ground and uses it to directly drive a turbine. Flash plants pull deep, high-pressure hot water into cooler, low-pressure water. The steam that results from this process is used to drive the turbine. In binary plants, the hot water is passed by a secondary fluid with a much lower boiling point than water. This causes the secondary fluid to turn to vapor, which then drives a turbine. Most geothermal power plants in the future will be binary plants."
conboyeri98

Fuel Cells | Energy Sources | Chevron - 0 views

www.chevron.com/...fuelcells

form fuel cell

shared by conboyeri98 on 11 Mar 13 - No Cached
  • Fuel cells are self-contained power generation devices that are able to produce reliable electricity for residential, commercial, industrial and transportation applications. A fuel cell can convert hydrogen directly into electricity that can be used to power an electric car, for example, or a home.
  • In fuel cells, the use of hydrogen produces fewer greenhouse gases than does burning fossil fuels
  • . Fuel cells convert energy efficiently, which helps conserve energy resources. And a byproduct of this electro-chemical process is pure water—a clear benefit for the environment
  • ...1 more annotation...
  • However, hydrogen—a tasteless, odorless, colorless gas—is not found freely in nature. It must be extracted from other substances.
behanjos99

What are geothermal energy advantages and disadvantages? - 0 views

cognitiveanomalies.com/y-advantages-and-disadvantages

disadvantages geothermal form

shared by behanjos99 on 11 Mar 13 - No Cached
  • Advantages: Geothermal energy cost is extremely low compared to many other energy sources. It has low pollution compared to fossil fuels and nuclear energy. Geothermal energy is a renewable energy source. Almost no environmental impact when using geothermal heat from nuclear decay. Geothermal heat pump systems can reduce your energy use storing heat from the summer/sun and makes use of it in the night and winter. Low maintenance systems.
  • Disadvantages: The most important disadvantage is absolutely the geological problem.  The heat source is mostly close to volcanic activity of some sort. Chemicals are byproducts of the production electricity with hot ground water. Some geothermal plants use a lot of water and it needs to go somewhere its after use. Some of the poluting chemicals in that water and steam are sulfur, mercury, hydrogen sulfide, arsenic, ammonia. Earth is a changing creature.  A drilled hole in the ground could supply thousands of homes heat and one earthquake could change that in a second.  It can also change gradually over time. Location, location, location.  That is certainly true of geothermal energy.  It cannot be transported over vast distances.  If used to heat up houses or for hot tap water it is only the quality of the pipe that delivers the water that determines how far it can go and if it will be of any use when it arrives. If the heat is used for electrical production it helps to have plants close so the energy loss is not too great. 
  • Corrosion is a big problem.  Composition of the chemicals can vary but it is always a problem.  It is among other the reason they need to heat up clean water to use and do not use it directly in to heating of houses.  In cases it has been used directly it causes pipes to corrode. In nuclear heating rock the rock cools down over few decades and hundreds of years are needed to get initial heating back.  Power stations of that sort are therefore not considered as profitable. Geothermal Heat pump systems do have high installation cost. Some areas run out of water or run low on ground water during seasonal dry spells. Less water means less heat and less energy to produce. Some drilling sites are too hot to handle.  Yea. Drillers have actually tried and tried some holes and they just can’t get the needed equipment in because the holes shoot it out like guns.   With workers running to stay alive while steel rains down on them. 
schmettererdav00

Biofuels - What are They and Where Do They Come From? | Sustainable Energy Systemz - 0 views

sustainableenergysystemz.com/...2929

biofuel form

shared by schmettererdav00 on 11 Mar 13 - No Cached
  • Biofuels are made with biomass (biological material from living or recently living organisms) there are many kinds, for example biodiesel involves growing crops that contain large amounts of natural oil, these plants then go through a refining process and subsequently are mixed in with regular diesel to power cars. Bio petrol is made in a similar way; plants are refined to make a natural ethanol.
carpenteraut98

How Are Hydrogen Fuel Cells Affecting the Environment? | eHow.com - 0 views

www.ehow.com/ls-affecting-environment_.html

fuel cell pollution

shared by carpenteraut98 on 11 Mar 13 - No Cached
  • por and a small amou
  • Unlike internal combustion and the burning of fossil fuels, hydrogen fuel cells do not produce particulates or emissions other than water vapor and a small amount of carbon dioxide.
  • carpenteraut98 on 11 Mar 13
     
    "hydrogen fuel cells do not produce particulates or emissions other than water vapor and a small amount of carbon dioxide."
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