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Topic: Hydroelectric energy storage

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	Renewable energy - Encyclopedia.WorldSearch (Site not responding. Last check: 2007-11-06)
		Some forms are stored solar energy such as Rainfall and wind power which are considered short-term solar-energy storage, whereas the energy in biomass is accumulated over a period of months, as in straw, or through many years as in wood.
		Hydroelectric energy produces essentially no carbon dioxide, in contrast to burning Fossil fuels or gas, and so is not a significant contributor to global warming.
		In practical terms, without proper energy storage methods these sources are therefore limited to some twenty percent of the capacity of an electricity grid, and cannot directly be applied as economic substitutes for fossil fuels or nuclear power, however important they may become in particular areas with favorable conditions.
	encyclopedia.worldsearch.com /renewable_energy.htm (5735 words)

	Energy storage - Wikipedia, the free encyclopedia
		Energy storage is the storing of some form of energy that can be drawn upon at a later time to perform some useful operation.
		Energy storage as a natural process is billions of years old - the energy produced in the initial creation of the Universe has been stored in stars such as our Sun, and is now being used by humans directly (e.g.
		Energy storage only became a major concern, however, with the introduction of electricity.
	en.wikipedia.org /wiki/Energy_storage (832 words)

	Energy storage Information - TextSheet.com (Site not responding. Last check: 2007-11-06)
		Power storage is the storing of some form of energy that can be drawn upon at a later time to perform some useful purpose.
		Power storage as a natural process is billions of years old - the energy produced in the initial creation of the Universe has been stored in stars such as our Sun, and is now being used by humans directly (e.g.
		As a purposeful activity power storage has certainly existed since pre-history, though it was often not recognized as such.
	www.sparrow.sferahost.com /encyclopedia/e/en/energy_storage.html (822 words)

	[No title]
		The factor that limits the energy storage capability of a flywheel, is the tensile strength of the material and itÕs density.
		Flywheels are efficient energy storage devices due to the lack of touching parts and the vacuum in which the flywheel is spinning.
		The main problem with this concept is that the outer rim incurs stresses that limit energy storage due to the cohesion properties of the material(just as described with the flywheel).
	www.tsgc.utexas.edu /archive/design/sps_storage/tech.doc (4473 words)

	Energy Storage (Site not responding. Last check: 2007-11-06)
		In this type of application, energy storage concepts are economical when the costs of the energy storage system's construction, operation and maintenance are offset by the differential between peaking and base-load energy costs.
		Energy storage systems could also be justified if they are more economic than new generating capacity that would be used only during times of peak load.
		In the pumped hydroelectric storage concept, such as that employed at Wivenhoe power station in Queensland, electrical energy from the electricity supply network is used to pump water from a lower level water storage to a higher level water storage.
	www.energymanagertraining.com /Energy_typs.htm (2254 words)

	HYDROELECTRIC ENERGY (Site not responding. Last check: 2007-11-06)
		In a dam, the potential energy of water in the reservoir is transformed into kinetic energy during the fall.
		In a pumped-storage hydroelectric power plant, water is pumped from the lower reservoir to the elevated one during the hours of minimum consumption of electricity (off-peak periods).
		Also, small hydroelectric plants on local waterfalls are a useful solution for places that are far from the national electric grid.
	www.energyworld.org /hydroelectric/english.htm (256 words)

	Hydroelectric Power in California
		Hydroelectric power, a renewable resource, is generated by hydraulic turbines that rotate due to the force of moving water as it flows from a higher to a lower elevation.
		In a pumped storage facility, water is pumped during off-peak demand periods from a reservoir at a lower elevation for storage in a reservoir at a higher elevation.
		During the off-peak pumping cycle, the pumped storage facility is a consumer of electricity: in fact, the amount of electricity required to pump the water uphill is greater than the amount of electricity that is generated when the water is released during peak demand periods.
	www.energy.ca.gov /electricity/hydro.html (912 words)

	Energy Storage (Site not responding. Last check: 2007-11-06)
		Energy storage systems are enabling technologies; their goal is to enhance and extend the operating capabilities of other assets on the grid.
		Energy storage facilities can interact in the electric value chain within three 'business models' which correspond to the market areas where they will interact: wholesale, retail and renewable.
		Generally, renewable energy sources are intermittent or vary in intensity throughout the day, with much of the potential for generated power not coincident with the peak demand.
	www.3nw.com /energy/resources/estorage.htm (2899 words)

	Compressed Air Energy Storage (CAES) (Site not responding. Last check: 2007-11-06)
		In compressed air energy storage, off-peak power is taken from the grid and is used to pump air into a sealed underground cavern to a high pressure.
		Aquifer storage is by far the least expensive method and is therefore used in most of the current locations.
		The required storage capacity is equal to the total energy input to the gas turbine train during the power generation period of 8 hours.
	www.doc.ic.ac.uk /~mpj01/ise2grp/energystorage_report/node7.html (1480 words)

	Exotic and Developmental Energy Storage: Technology and Markets
		There are areas where these energy storage systems could experience the explosive growth usually associated with emerging industries.
		As technical issues associated with emerging and developmental energy storage systems are resolved, new issues regarding manufacturability and cost are emerging.
		First, conventional energy storage technology is compared to emerging and developmental options.
	www.marketresearch.com /researchindex/374587.html (1348 words)

	Rezachek & Associates' Energy & Environmental Resources - Renewable Energy - Hydroelectric
		Estimated Use of Water in the United States in 1990 - Hydroelectric Power Water Use Water used for hydroelectric power generation is classified as an instream use and refers to the water used in the generation of electricity at plants where the turbine generators are driven by falling water.
		Estimates of water used for hydroelectric power generation may vary because of the way individual estimates are made of the quantities of water passed through the plants.
		Hydroelectricity and Other Renewable Resources Moderate growth in the use of renewable energy resources is projected for all regions of the world.
	www.sustainablehawaii.com /hydropg1.htm (1671 words)

	The electrolysis/fuel cell possibility has many good qualities
		The storage system should be able to collect energy for one hour every six hours (tentatively), and disperse it onto the utility grid as needed.
		This energy storage system is comprised of two main sub-systems, an electrolysis device and a fuel cell array.
		One big advantage of hydroelectric energy storage is that extracting the power is current technology and has been used for the past 60 - 70 years.
	www.tsgc.utexas.edu /archive/design/sps_storage/full.html (5269 words)

	Energy, Entropy, Economics, and Ecology
		Energies from sources are used in energy transformation processes to produce the quantities stored in the tank.
		The decline of usable energy is the increase of entropy (the increase of sand in the bottom chamber of the hour glass, to recall the analogy in the Introduction).
		Thereafter, although the amount of energy in the heat, gases and ashes is the same as the amount that was in the wood, it is scattered (unavailable).
	www.dieoff.com /page17.htm (9313 words)

	Energy Storage
		Energy storage must consider both the amount of energy that can be stored (energy density of the material) and the efficiency at which it can be recovered.
		The required energy storage is 26 KWH/140 Kg =.18 KWH/kg which excees the energy storage density of steel - hence such a flywheel requires construction out of carbon fiber.
		Energy required (usually from fuel) to expand the cool air taken from storage as it entires the turbine.
	zebu.uoregon.edu /2001/ph162/l8.html (980 words)

	Hydropower Reconnaissance Survey, 1981 (Site not responding. Last check: 2007-11-06)
		The effect of energy value escalation is that the initial price will increase at some rate every year according to the prevailing market prices of electricity.
		Pumped storage is a means of using water pumped uphill to store energy for use during peak power periods.
		The energy for pumping could either come from base-loaded generating plants or from variable energy sources, such as wind and solar.
	www.state.hi.us /dbedt/ert/hydropower-81.html (980 words)

	Energy Storage: The Sixth Dimension of the Electricity Value Chain (Site not responding. Last check: 2007-11-06)
		Energy storage is poised to play a pivotal role in this new power market.
		By supplying power when and where needed, energy storage is on the brink of becoming the “sixth dimension” of the electric power market by integrating the existing segments (fuel, generation, transmission and marketing, distribution, and energy services) into a far more flexible framework.
		As energy demand continue to grow, storage assets will also be able to “pre-position” electricity past congestion points, allowing the deferral of hard-to-locate transmission assets.
	www.pearlstreetinc.com /esr.htm (1278 words)

	TVA: Hydroelectric Power (Site not responding. Last check: 2007-11-06)
		Water is needed to run a hydroelectric generating unit.
		It’s held in a reservoir or lake behind the dam, and the force of the water being released from the reservoir through the dam spins the blades of a turbine.
		During periods of low demand for electricity, such as nights and weekends, energy is stored by reversing the turbines and pumping water from the lower to the upper reservoir.
	www.tva.gov /power/hydro.htm (234 words)

	Open Directory - Science:Technology:Energy:Storage (Site not responding. Last check: 2007-11-06)
		Producing antimatter uses vast amounts of energy, far more than it can release in matter-antimatter annihilation reactions, so antimatter is not an efficint means of energy storage.
		Compressed Air Energy Storage (CAES) is the compression of large quantities of air, usually into an underground cavern or mine, during off-peak periods.
		Flywheels store and release kinetic energy (mass in motion) in this context, they apply to devices which may be used to store electrical energy by attaching a motor-generator to a high-speed rotating weight.
	dmoz.org /Science/Technology/Energy/Storage/desc.html (560 words)

	HYDRO (Site not responding. Last check: 2007-11-06)
		The basis of hydroelectric power generation is that water at height has certain potential energy.
		Also related to hydroelectric is the practice of using pumped storage facilities as an energy storage device.
		The pumped storage uses electricity during low demand times to pump water from the low-elevation reservoir to the high-elevation reservoir.
	www.eas.asu.edu /~holbert/eee463/HYDRO.HTML (231 words)

	Hydroelectric Energy (Site not responding. Last check: 2007-11-06)
		Electric energy is the fastest growing major user of primary energy sources and its problems are representative of many other problems having technical, political, social, legal, and environmental dimensions.
		Hydroelectric is on of may sources of electric energy.
		In this lesson we will understand the advantages and disadvantages of hydroelectric power and why it must become a diminishing percent of total generating capacity.
	www.rit.edu /~flwstv/eesess10.html (82 words)

	Sustainable Energy - Hydroelectric Energy (Site not responding. Last check: 2007-11-06)
		Most hydroelectricity projects require the building of large dams on rivers, which can be very expensive.
		When large dams are built the flow of the dammed river is changed radically and large areas of land are flooded, including wildlife habitats and farming land.
		There is a pumped storage hydroelectric power station at Wivenhoe Dam, west of Brisbane.
	www.sustainableenergy.qld.edu.au /sources/hydro.html (250 words)

	The Environmental Literacy Council - Hydroelectric Power
		At the beginning of this century, hydroelectric power from dams supplied approximately 30 percent of the generating capacity in the U.S. Although hydroelectric power is a relatively clean source of energy and a renewable source, it is currently used to supply only about ten percent of our energy supply, according to the Department of Energy.
		In November 1997, the Federal Energy Regulatory Commission ordered the removal of the 160-year old Edwards dam in Maine (see a history of the dam).
		Their Water Science for Schools program also offers Hydroelectric Power: How it works with an animated diagram demonstrating how hydroelectric power is produced.
	www.enviroliteracy.org /article.php/59.html (1039 words)

	Directory - Science: Technology: Energy: Storage: Pumped Storage
		TVA: Hydroelectric Power · cached · Answers question: "What is a pumped-storage plant?" with links to a diagram and a picture.
		Blenheim-Gilboa Pumped Storage Power Project · iweb · cached · New York Power Authority facility generates one million kilowatts in the Catskill mountains using five billion gallons of water and a 2,000 foot elevation
		Oahu Pumped Storage Hydro Report · cached · Executive summary and index with links to report totalling 322 pages.
	www.incywincy.com /default?p=962585 (151 words)

	Barry Energy (Site not responding. Last check: 2007-11-06)
		Large air storage means that you can site compressed air energy storage (CAES) systems, which are used as a means of “storing” electricity (which by nature can not be stored).
		Although energy storage and renewables can be pursued independently at the Barry site, BEDL believes that the synergies between the two may be even more compelling.
		Attention to global warming naturally focuses attention on renewable energy sources for new capacity, but also on the optimized use of existing capacity (which is one of the key advantages of bulk energy storage).
	www.pearlstreetinc.com /barry_energy.htm (1567 words)

	Hydropower in Hawaii (Site not responding. Last check: 2007-11-06)
		The Wailuku River Hydroelectric Power Company plant is the largest in the state and began producing electricity in May 1993.
		Pumped storage hydropower plants pump water back up from a lower reservoir to an upper reservoir where it is stored and then released when needed to provide power.
		Energy Education Resources: Kindergarten Through 12th Grade - www.eia.doe.gov/bookshelf/eer/kiddietoc.html - the US Department of Energy's list of free or low-cost energy-related educational materials available from a variety of sources.
	www.hawaii.gov /dbedt/ert/hydro_hi.html (1480 words)

	Chapter 2: Magnetic Energy Storage Efforts in the United States (Site not responding. Last check: 2007-11-06)
		The most significant program on energy storage in the world is being carried out by Babcock and Wilcox (BandW) in the United States.
		Physical restrictions at Bradley Lake result in dispatch time for this hydro capacity of approximately one minute or more, too long a time to prevent additional load shedding during an event such as a generator outage, which would lead to frequency instability on the system, resulting in programmed load shedding.
		These ~1 MW units with a few MJ stored energy are commercially produced by Superconducting, Inc. (SI), of Madison, Wisconsin, and by IGC of Latham, New York.
	www.wtec.org /loyola/scpa/02_08.htm (395 words)

	Energy Storage Council: About Storage (Site not responding. Last check: 2007-11-06)
		Distributed Resources: Energy storage systems make DG more reliable, efficient, secure.
		Energy Storage: The Sixth-and Missing-Link in the Electricity Value Chain
		Advocating and facilitating the deployment of energy storage technologies.
	www.energystoragecouncil.org /energystoragelinks.htm (162 words)

	Energy Storage
		They take an electrical input to accelerate the rotor up to speed by using the built-in motor, and return the electrical energy by using this same motor as a generator.Flywheels are one of the most promising technologies for replacing conventional lead acid batteries as energy storage systems.
		Flow batteries are scalable from a few watts and kilowatt-hours to tens or hundreds of megawatts and megawatt-hours.
		New Technology: ultracapacitors are a new energy storage technology ideally suited for applications needing repeated bursts of power for fractions of a second to several minutes.
	zebu.uoregon.edu /disted/ph162/l8.html (845 words)

	News Release: TVA Reopens Raccoon Mtn Visitor Center (Site not responding. Last check: 2007-11-06)
		With a touch of a button on a scale model, visitors to the center can see how the pumped-storage plant works.
		Children and children at heart can generate electricity by hand cranking a model hydroelectric generator.
		Located at the top of Raccoon Mountain west of Chattanooga, the visitor center offers a dramatic view of the Tennessee River as it passes through the gorge more than 1,000 feet below.
	www.tva.gov /news/releases/aprjun03/raccoon.htm (389 words)

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