Most hydroelectricity is produced at large dams built by the federal government, and many of the largest hydropower dams are in the western United States. About half of total U.S. utility-scale conventional hydroelectricity generation capacity is concentrated in Washington, California, and Oregon.
Hydropower does not pollute the water or the air. However, hydropower facilities can have large environmental impacts by changing the environment and affecting land use, homes, and natural habitats in the dam area. Methane, a strong greenhouse gas, may also form in some reservoirs and be emitted to the atmosphere.
Pros of Hydroelectric Power
- Renewable energy source. Hydroelectric energy is renewable.
- Clean energy source.
- Cost competitive energy source.
- Contributes to development of remote communities.
- Recreational opportunities.
- Fundamental vehicle for sustainable development.
- Environmental damage.
- High upfront capital costs.
Nowadays, huge power generators are placed inside dams. Water flowing through the dams spin turbine blades (made from metal instead of leaves) which are connected to generators. Power is produced and is sent to homes and businesses. Hydropower is the most important and widely-used renewable source of energy.
Hydropower is the most efficient way to generate electricity. Modern hydro turbines can convert as much as 90% of the available energy into electricity. The best fossil fuel plants are only about 50% efficient. In the U.S., hydropower is produced for an average of 0.85 cents per kilowatt-hour (kwh).
Hydroelectric power, electricity produced from generators driven by turbines that convert the potential energy of falling or fast-flowing water into mechanical energy.
Electricity is most often generated at a power plant by electromechanical generators, primarily driven by heat engines fueled by combustion or nuclear fission but also by other means such as the kinetic energy of flowing water and wind. Other energy sources include solar photovoltaics and geothermal power.
The majority of hydroelectric installations utilize salient pole synchronous generators. Salient pole machines are used because the hydraulic turbine operates at low speeds, requiring a relatively large number of field poles to produce the rated frequency.
Hydropower is the most important and widely-used renewable source of energy. Hydropower represents about 17% (International Energy Agency) of total electricity production. China is the largest producer of hydroelectricity, followed by Canada, Brazil, and the United States (Source: Energy Information Administration).
There are three types of hydropower facilities: impoundment, diversion, and pumped storage. Some hydropower plants use dams and some do not. The images below show both types of hydropower plants.
There are three main types of conventional hydropower technologies: impoundment (dam), diversion, and pumped storage. Impoundment is the most common type of hydroelectric power plant. An impoundment facility, typically a large hydro-power system, uses a dam to store river water in a reservoir.
Brazil, Canada, New Zealand, Norway, Paraguay, Austria, Switzerland, Venezuela, and several other countries have a majority of the internal electric energy production from hydroelectric power. Paraguay produces 100% of its electricity from hydroelectric dams and exports 90% of its production to Brazil and to Argentina.
Hydropower uses a fuel—water—that is not reduced or used up in the process. Because the water cycle is an endless, constantly recharging system, hydropower is considered a renewable energy. When flowing water is captured and turned into electricity, it is called hydroelectric power or hydropower.
There are three types of hydropower facilities: impoundment, diversion, and pumped storage. Some hydropower plants use dams and some do not. The images below show both types of hydropower plants.
Advantages of Hydroelectric Energy
- 1 Renewable. Hydroelectric energy is renewable.
- 2 Green. Generating electricity with hydro energy is not polluting itself.
- 3 Reliable. Hydroelectricity is very reliable energy.
- 4 Flexible. As previously mentioned, adjusting water flow and output of electricity is easy.
- 5 Safe.
Small-scale hydroelectricity, or hydropower, can be used on a domestic scale to heat your home or run your appliances.
Types of Hydroelectric Power
This fast flowing water turns the turbines, and the generator system converts this kinetic energy into electrical energy. An example of a hydroelectric power dam, is the Kielder Water reservoir, located in Northumberland, operated by RWE Npower and is the largest system in England.There are numerous environmental consequences of damming water, flooding entire areas, creating massive reservoirs, changing water flow, blocking the natural course of rivers, and constructing power lines and roads. Lack of water. Droughts have a serious impact on how much hydropower can be produced.
As long as there is water, electricity can be generated. Water flow can be adjusted and even conserved according to the need for power. It is safe! Compared with the use of fossil fuels and nuclear energy, hydropower is a much safer system.
