November 16, Overview Idaho has few fossil fuel resources but is rich in renewable energy resources.
Most of the total hydroelectric capacity is in the southwest—notably in Sichuan, Yunnan, Tibet, and Hubei—where coal supplies are poor but demand for energy is In the generation of hydroelectric power, water is collected or stored at a higher elevation and led downward through large pipes or tunnels penstocks to a lower elevation; the difference in these two elevations is known as the head.
At the end of its passage down the pipes, the falling water causes turbines to rotate. Transformers are then used to convert the alternating voltage suitable for the generators to a higher voltage suitable for long-distance transmission.
The structure that houses the turbines and generators, and into which the pipes or penstocks feed, is called the powerhouse. Hydroelectric power plants are usually located in dams that impound riversthereby raising the level of the water behind the dam and creating as high a head as is feasible.
The potential power that can be derived from a volume of water is directly proportional to the working head, so that a high-head installation requires a smaller volume of water than a low-head installation to produce an equal amount of power.
In some dams, the powerhouse is constructed on one flank of the dam, part of the dam being used as a spillway over which excess water is discharged in times of flood.
Where the river flows in a narrow steep gorge, the powerhouse may be located within the dam itself. To even the load on the generators, pumped-storage hydroelectric stations are occasionally built. During off-peak periods, some of the extra power available is supplied to the generator operating as a motor, driving the turbine to pump water into an elevated reservoir.
Then, during periods of peak demand, the water is allowed to flow down again through the turbine to generate electrical energy. Pumped-storage systems are efficient and provide an economical way to meet peak loads.
In certain coastal areas, such as the Rance River estuary in BrittanyFrancehydroelectric power plants have been constructed to take advantage of the rise and fall of tides. When the tide comes in, water is impounded in one or more reservoirs.
At low tide, the water in these reservoirs is released to drive hydraulic turbines and their coupled electric generators see tidal power.
Diagram of a tidal power barrage. Falling water is one of the three principal sources of energy used to generate electric powerthe other two being fossil fuels and nuclear fuels.
Hydroelectric power has certain advantages over these other sources: Hydroelectric power is a preferred energy source in areas with heavy rainfall and with hilly or mountainous regions that are in reasonably close proximity to the main load centres.
Some large hydro sites that are remote from load centres may be sufficiently attractive to justify the long high-voltage transmission lines.
Small local hydro sites may also be economical, particularly if they combine storage of water during light loads with electricity production during peaks.
Many of the negative environmental impacts of hydroelectric power come from the associated dams, which can interrupt the migrations of spawning fishsuch as salmonand permanently submerge or displace ecological and human communities as the reservoirs fill.Idaho, also known as the Gem State, is rich in silver, phosphate, and many other minerals, but the state has few fossil fuel resources.
1,2 Idaho's energy potential lies in its substantial renewable resources, including solar, wind, hydropower, geothermal, and biomass. 3 Mountains cover much of Idaho from its border with Canada on the north to Nevada and Utah on the south.
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For viewing only, you can play with our flash based presentation viewer instead of downloading the ppt file. An Assessment of Energy Potential at Non-Powered Dams in the United States 1 Introduction This report describes a U.S.
Department of Energy (DOE) Wind and Water Power Program study carried. Learn how moving water is converted into electricity in this comprehensive overview, including a discussion of the hydropower resource, its environmental and societal impacts, and the potential for future expansion of hydroelectic energy.
Hydroelectric power, electricity produced from generators driven by turbines that convert the potential energy of falling or fast-flowing water into mechanical energy. wave power Overview of efforts to create usable energy from waves, including a discussion of the Pelamis power generator in the North Sea off the coast of Scotland.
hydroelectric power. Hydroelectric power (hydropower) is a renewable energy source where electrical power is derived from the energy of water moving from higher to lower elevations.