Wiktor Wise
Hydropower, or hydroelectric power, is a renewable source of energy that uses the natural flow of water to generate electricity. Hydroelectric plants use falling water to turn a turbine, which then turns a metal shaft in an electric generator that produces electricity. The speed of a hydroelectric project refers to the rotational speed of the turbine and generator, which is controlled by adjusting the amount of water flowing into the turbine. This speed is important in maintaining a consistent frequency of electricity output, such as 50Hz or 60Hz, to meet the demands of the power grid. Pico hydro, small hydro, and large hydropower projects vary in scale and capacity, but all rely on the kinetic energy of flowing water to produce electricity.
| Characteristics | Values |
|---|---|
| Type of Energy | Renewable |
| Source of Energy | Water |
| Electricity Generation in 2023 | 4,210 TWh |
| Percentage of World's Electricity Generation | 15% |
| Percentage of U.S. Electricity Generation | 6.7% |
| Percentage of U.S. Renewable Electricity Generation | 27% |
| Cost | Affordable |
| Environmental Impact | Low |
| Greenhouse Gas Emissions | Low |
| Size | Micro, Pico, Small, Large |
| Use Cases | Powering Homes, Businesses, Industries, Remote Communities |
| Power Source | Kinetic Energy of Flowing Water |
| Power Generation Mechanism | Turbines and Generators |
| Water Source | Rivers, Streams, Bodies of Water with Large Drop in Elevation |
| Water Accumulation | Dams, Reservoirs |
| Water Release | Hydro Turbines, Tailrace |
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What You'll Learn
Environmental impact
Hydroelectric power projects, including both massive hydroelectric dams and small run-of-the-river plants, can have significant environmental impacts. Firstly, the construction of dams and reservoirs can result in the flooding of land, leading to the destruction of forests, wildlife habitats, agricultural land, and scenic areas. The size of the flooded area depends on the topography of the land, with flat areas requiring more land than hilly regions or canyons. For example, the Balbina hydroelectric plant in Brazil flooded 2,360 square kilometers of land. This flooding can also lead to the displacement of local communities, with estimates ranging from 40 to 80 million people directly displaced by dams and reservoirs globally.
Secondly, the operation of dams and reservoirs can alter river flows, raise water temperatures, degrade water quality, and cause sediment buildup. These changes can negatively impact fish, birds, and other wildlife, as well as affect the livelihoods of people downstream. Additionally, the construction and operation of hydroelectric generators can emit carbon dioxide and contribute to vegetation loss, although these emissions are offset by the long operating lifetime of hydropower plants.
Thirdly, the planning and installation stages of hydroelectric projects can impact land use and require careful consideration to minimize potential harm to the surrounding environment. This includes obtaining permission from relevant environmental agencies and complying with environmental legislation. Innovative technologies, optimized operations, and strategic site selection can help mitigate these environmental impacts and ensure the long-term sustainability of hydroelectric generation.
While hydropower is a renewable and clean energy source, it is important to carefully manage and address the environmental impacts associated with its generation. These impacts can vary significantly among facilities and over time, and the benefits of hydropower must be weighed against its environmental and social costs.
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Cost of construction
The cost of constructing a hydroelectric project varies depending on several factors. The average installation cost of hydroelectric systems worldwide in 2022 was $2,881 per kilowatt installed. However, this cost can vary based on factors such as size, output, quality of the system, connection to the grid, labour costs, and materials used. For example, small hydropower systems tend to have higher costs per kilowatt installed compared to conventional hydro systems.
In the United States, hydro typically has a higher average construction cost per kilowatt than other energy sources. In 2016, the average construction cost per kilowatt for hydro was $5,312, more than double that of solar power, the next closest technology. The total construction cost for hydro in the US in 2016 was about $2.5 billion.
The cost of constructing a new hydropower plant can also vary depending on the location and project scale. For example, the estimated cost of building a new 1 GW hydropower plant in Ukraine ranges from $1 to $2 billion, with some experts predicting that the total price may exceed this range. The high cost of construction is due to the heavy reliance on available land and civil works costs, as well as the rising cost of labour and building materials.
To optimize the cost of constructing a hydroelectric project, it is essential to consider factors such as location, project scale, and regulatory requirements. Conducting a comprehensive feasibility study and environmental impact assessment is crucial for accurately forecasting and managing startup costs. Selecting the right technology and equipment, including considering used or refurbished options, can also help lower initial expenses.
Additionally, it is important to budget for long-term maintenance and repairs to avoid unexpected surges in operational costs. Underestimating environmental compliance costs and overlooking long-term maintenance can significantly impact the overall cost of a hydroelectric project.
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Generating electricity
Hydropower, or hydroelectric power, is a renewable source of energy that uses the natural flow of moving water to generate electricity. It is one of the oldest and largest sources of renewable energy, currently accounting for 27% of total US utility-scale renewable electricity generation and 15% of the world's electricity. Hydropower relies on the water cycle to produce electricity, using a fuel—water—that is not reduced or eliminated in the process.
Hydroelectric power plants are usually located on or near a water source, such as a river or a reservoir created by a dam. The volume of water flow and the change in elevation, or "head", determine the amount of energy available in the moving water. This kinetic energy of flowing water is then converted into electricity through the use of turbines and generators. The turbines are turned by the falling water, which then turns a metal shaft in an electric generator, producing electricity. This process is similar to how coal-fired power plants produce electricity, but hydroelectric power does not produce carbon dioxide as it does not use fuel.
The size of hydroelectric plants can vary from small "micro hydro" or "pico hydro" projects that produce up to 100 kW or under 5 kW of power, respectively, to large plants that supply power to an entire country. Small hydro projects are often built in isolated areas that are not connected to a national electrical distribution network or in areas where it would be uneconomic to serve from the grid. These smaller projects typically have minimal reservoirs and civil construction work, resulting in a relatively low environmental impact compared to large hydro projects.
The development of hydropower technology has seen many advancements, particularly in the first half of the 19th century and more recently in the past century. However, there have also been challenges, such as the increasing costs of constructing new large hydropower projects and opposition from anti-dam movement groups. Despite these challenges, hydropower has become an integral part of the renewable energy mix in the United States and continues to be a significant source of electricity generation worldwide.
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Types of hydropower facilities
Hydropower is a clean, reliable, versatile, and low-cost source of electricity generation and responsible water management. Hydropower facilities range in size from large power plants that supply electricity to many consumers, to small and even 'micro' plants, operated by individuals for their own energy needs or to sell power to utilities.
There are three main types of hydropower facilities: impoundment, diversion, and pumped storage. The most common type of hydroelectric power plant is an impoundment facility, which typically uses a dam to store river water in a reservoir. Water released from the reservoir flows through a turbine, spinning it, and activating a generator to produce electricity. The water may be released to meet electricity needs or to maintain a constant reservoir level.
Diversion facilities, sometimes called 'run-of-river', channel a portion of a river through a canal or penstock to utilise the natural decline of the river bed elevation to produce energy. Diversion facilities may not require the use of a dam. The Tazimina project in Alaska is an example of a diversion hydropower plant that does not use a dam.
Pumped storage hydropower (PSH) facilities work like a giant battery, storing electricity generated by other power sources, such as solar, wind, and nuclear, for later use. These facilities store energy by pumping water from a lower reservoir to an upper reservoir when demand for electricity is low. During periods of high electrical demand, the water is released back to the lower reservoir, turning a turbine and generating electricity.
In addition to the three main types of hydropower facilities, there are also different types of hydropower turbines. There are two main types of hydropower turbines: reaction and impulse. Reaction turbines generate power from the combined forces of pressure and moving water. They are generally used for sites with lower head heights and higher flow rates and are the most common type currently used in the United States. The two most common types of reaction turbines are propeller (including Kaplan) and Francis.
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Location of hydroelectric plants
The location of hydroelectric power plants is primarily determined by the availability of water sources, as water is essential for generating hydropower. Therefore, hydroelectric power plants are typically situated on or near water bodies like rivers, lakes, or reservoirs. The volume of water flow and the change in elevation, referred to as the "head," are crucial factors in determining the amount of energy that can be extracted from the moving water. Generally, a higher water flow rate and a greater head enable a hydropower plant to produce more electricity.
The most common type of hydroelectric power plant is an impoundment facility, which uses a dam to store river water in a reservoir. The water is then released from the reservoir and directed through a turbine, spinning it to activate a generator and produce electricity. The release of water can be adjusted to meet varying electricity needs or for other purposes such as flood control, recreation, fish passage, and maintaining environmental and water quality standards.
Diversion facilities, also known as "run-of-river" systems, are another type of hydroelectric power plant. These facilities channel a portion of a river's water flow through a canal or penstock to utilise the natural decline in riverbed elevation and generate electricity. Run-of-river systems rely on the force of the river's current to apply pressure on a turbine. Additionally, storage systems, including pumped-storage hydropower facilities, accumulate water in reservoirs created by dams. The water is released from the upper reservoir to power hydro turbines located below, generating electricity.
In the United States, about half of the utility-scale conventional hydroelectricity generation capacity is concentrated in Washington, California, and Oregon. Washington, being home to the Grand Coulee Dam, has the highest electricity-generation capacity among all U.S. power plants. The Hoover Dam, straddling Arizona and Nevada, was the first hydroelectric power station in the U.S. to surpass a capacity of 1,000 MW upon its completion in 1936. Today, all but two states in the U.S., namely Delaware and Mississippi, have at least one hydroelectric power station.
Hydropower plants vary in size, ranging from micro hydropower plants capable of powering a single home to large projects that produce electricity for entire utilities. The size and capacity of a hydroelectric power plant are crucial considerations in determining their location and impact on the surrounding environment and communities.
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Frequently asked questions
A hydroelectric project is a power source that uses falling or fast-running water to produce electricity.
Water flows through a pipe and spins the blades in a turbine, which then spins a generator to produce electricity.
The speed of the turbines is controlled by adjusting the amount of water flowing into the turbine.
Hydroelectric projects have relatively low maintenance, operational, and fuel costs. They also do not directly produce carbon dioxide or other atmospheric pollutants.
Some examples of hydroelectric projects include the Hoover Dam, the Three Gorges Dam, and the Aswan High Dam.
