Trystan Casey
Hydroelectricity, or hydroelectric power, is the generation of electricity from hydropower or water power. It is one of the oldest sources of energy for producing mechanical and electrical energy, with the first industrial use of hydropower to generate electricity in the United States dating back to 1880. In 2021, global installed hydropower electrical capacity reached almost 1,400 GW, the highest among all renewable energy technologies. Hydroelectricity plays a leading role in countries like Brazil, Norway, and China, providing a domestic source of low-cost renewable energy. However, some argue that hydroelectric power is not a sustainable renewable energy resource due to its environmental impact, including reservoir emissions and the need to relocate people living in planned reservoir areas.
| Characteristics | Values |
|---|---|
| Definition | Electricity generated from hydropower (water power) |
| Global Installed Capacity | 1,400 GW in 2021 |
| Share of Global Electricity Generation | 15% of the world's electricity in 2023 |
| Share of US Electricity Generation | 6.2% in 2022 |
| Advantages | Low-cost, low-carbon, stabilising effect on the power grid, water services, flood control, irrigation control, water distribution, wastewater control |
| Disadvantages | Reservoir emissions, impact on local plant and wildlife, relocation of people, geographical limits |
| Environmental Impact | Greenhouse gas emissions of 2-8% in boreal reservoirs of Canada and Northern Europe |
| Historical Use | Used for more than 100 years, first industrial use in 1880 in the US |
| Types of Facilities | Impoundment, diversion, and pumped storage |
| Number of Facilities | 1,450 conventional and 40 pumped-storage hydropower plants in the US |
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What You'll Learn
- Hydropower is one of the oldest sources of energy
- Hydropower is a renewable, clean energy source
- Hydropower is affordable and has a low levelised cost of electricity
- Hydropower facilities can provide water services such as flood control and irrigation
- Hydropower has a stabilising effect on the power grid
Hydropower is one of the oldest sources of energy
Hydropower is created by water passing through a dam to activate turbines connected to a power generator, converting the kinetic energy of flowing water into electricity. This form of renewable electricity has a low levelised cost of electricity, providing an affordable and durable alternative to other energy sources. It also offers price stability by avoiding market fluctuations and reducing reliance on imported fossil fuels.
In 2021, global installed hydropower electrical capacity reached approximately 1,400 GW, the highest among all renewable energy technologies. Hydropower plays a leading role in several countries, such as Brazil, Norway, and China. It supplied 15% of the world's electricity in 2023, more than any other renewable source and nuclear power. Small hydro projects, with a generating capacity of up to 10 megawatts (MW), can serve as a source of low-cost renewable energy for small communities or industrial plants.
However, hydropower faces geographical limitations and environmental challenges. Its production levels are dependent on annual precipitation, and prolonged drought conditions can lead to decreased output. The creation of reservoirs for hydropower projects can result in "reservoir emissions," where plant decay releases methane into the atmosphere. Additionally, the construction of reservoirs may require the relocation of local residents. Despite these considerations, hydropower remains an essential and widely used renewable energy source, providing a stabilising effect on power grids and serving as backup power during outages.
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Hydropower is a renewable, clean energy source
Hydropower is considered renewable because the water used in its generation is not significantly reduced or depleted. The kinetic energy of the water is converted into electricity without diminishing the water supply. This distinguishes it from non-renewable resources like coal, oil, and natural gas, which are finite and require import from other regions.
Hydropower offers several advantages as a renewable energy source. Firstly, it provides a domestic source of electricity for countries, reducing their reliance on international fuel sources. Secondly, hydropower facilities can also offer water services such as flood control, irrigation control, water distribution, and wastewater control. Additionally, hydropower has a stabilising effect on the power grid. It can quickly ramp up from zero to maximum output, providing essential backup power during outages and meeting peak demand.
Despite the benefits, there are geographical limitations and environmental concerns associated with hydropower. The construction of reservoirs for hydropower projects can result in "reservoir emissions," where plant material decay releases methane. Additionally, the relocation of people living in planned reservoir areas and the impact on local plant and wildlife life are other challenges.
In conclusion, hydropower is a renewable and clean energy source that has been utilised for electricity generation for many years. While it offers advantages such as energy stability and domestic resource availability, it also faces challenges related to sustainability and environmental impact.
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Hydropower is affordable and has a low levelised cost of electricity
Hydropower is a renewable energy source that provides affordable energy to homes and businesses worldwide. Hydropower generation benefits consumers through lower electricity costs. The levelised cost of electricity (LCOE) for hydropower is lower than most other energy sources, including fossil fuels and other renewables. LCOE measures the cost of an energy source over its lifetime generating cycle, taking into account upfront and running costs.
A report by the International Renewable Energy Agency (IRENA) in 2022 found that the global weighted average LCOE of new utility-scale hydropower in 2021 was 11% lower than the cheapest new fossil fuel-fired power generation option. Similarly, IRENA's 2020 report showed that 99% of hydropower projects commissioned that year fell within or below the fossil fuel-fired cost range, and 56% had an LCOE lower than the cheapest new fossil fuel option.
Hydropower's low LCOE is due to its relatively low maintenance, operations, and fuel costs compared to other electricity sources. As hydropower relies solely on the power of moving water, its prices are stable and not subject to unpredictable changes in fuel costs. This price stability is advantageous for consumers and contributes to the overall affordability of hydropower.
Furthermore, hydropower has high energy conversion efficiency levels of 90% or more, making it one of the most efficient known sources of energy. This efficiency contributes to the low cost of hydropower electricity. Additionally, hydropower projects can have long operational lifespans, with some plants running for over a century, further reducing the average annualised cost.
The affordability of hydropower has significant implications for energy security and accessibility. Countries with substantial hydropower capacity, such as Norway, Sweden, and Iceland, tend to have lower average electricity prices. Hydropower also reduces external energy dependence, as it is an abundant domestic resource, allowing countries to produce their own energy.
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Hydropower facilities can provide water services such as flood control and irrigation
Hydropower is a renewable energy source that uses the natural flow of water to generate electricity. In 2021, hydropower supplied 15% of the world's electricity, or 4,210 TWh, which is more than all other renewable sources combined. In the same year, global installed hydropower electrical capacity reached 1,400 GW, the highest among all renewable energy technologies.
Hydropower facilities can provide essential water services such as flood control and irrigation. Flood control is achieved through the regulation of water levels in reservoirs, which can store floodwaters and control the timing of water discharge. This helps to protect communities from floods and reduce economic losses. For example, in Norway, regulated power plants have contributed to reducing flood damage payments significantly.
Irrigation systems are supported by hydropower facilities, which can provide water supply and distribution. This is especially important in agriculture, where water resources are essential for crop growth. In addition to flood control and irrigation, hydropower facilities can also provide domestic water supply, facilitate navigation, and promote fishing and aquaculture.
The benefits of hydropower go beyond electricity generation and water services. Hydropower plants can provide power to the grid immediately, serving as a flexible and reliable form of backup power during major electricity outages. They also have low operating and maintenance costs, making them an affordable source of electricity. Furthermore, hydropower projects can support the achievement of sustainable development goals, such as ensuring access to affordable and sustainable energy, and upgrading infrastructure with clean technologies.
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$8.43
Hydropower has a stabilising effect on the power grid
Hydropower, or hydroelectric power, is a renewable energy source that uses the natural flow of moving water to generate electricity. It is one of the oldest and largest sources of renewable energy, with a global installed electrical capacity of almost 1,400 GW in 2021, the highest among all renewable energy technologies. This makes it a leading source of electricity in countries like Brazil, Norway, and China.
Hydropower has a stabilizing effect on the power grid due to its ability to quickly ramp up and provide additional capacity when electricity demand exceeds the availability of other renewable sources, such as solar and wind power. This flexibility allows hydropower to act as a critical backup power source during major electricity outages or disruptions, helping to stabilize the grid and prevent widespread blackouts.
The stabilizing effect of hydropower is particularly evident in times of extreme weather or natural disasters, which can cause sudden losses of power. In such situations, hydropower can rapidly respond and ramp up to stabilize the grid nearly instantaneously. For example, during the 2021 heat wave in California, hydropower generated up to one-third of the state's electricity in the evening when solar resources were unavailable. Similarly, in New York, hydropower was able to produce almost half of the state's electricity within six hours of a power loss, demonstrating its ability to mitigate the impact of outages.
The ability of hydropower to stabilize the power grid is further enhanced by its capacity for immediate power generation. Unlike other renewable sources, hydropower facilities can quickly go from zero power to maximum output, providing essential backup power and grid stability. This immediate power generation is made possible by the use of reservoirs, which allow for the storage of water and the adjustment of power generation to meet consumption needs.
In addition to its stabilizing effect on the power grid, hydropower offers several other benefits. It is a low-carbon and cost-effective energy source, providing low-cost electricity with high durability. Hydropower plants can also provide water services such as flood control, irrigation control, and water distribution, as well as mitigate the effects of climate change on ice retreat by offsetting diminishing water resources through its storage capacity.
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Frequently asked questions
Yes, conventional hydroelectric power is a renewable resource.
The supply of water is not significantly reduced or eliminated when converting the water's kinetic energy into electricity.
Water passes through a dam to activate turbines, which connect to a power generator to convert the flowing water into electricity.
Conventional hydropower facilities can quickly go from zero power to maximum output, providing essential backup power during major electricity outages or disruptions.
One of the main disadvantages of conventional hydroelectric power is its impact on the local plant and wildlife. When a lake or reservoir is created, plant material begins to decay and release methane into the atmosphere.
