Regan Brown
Hydropower is a renewable energy source that uses the power of moving water to generate electricity. It is regarded as the most cost-effective renewable power generation technology available globally. Hydropower costs are reportedly the lowest when compared to all major renewable energy and fossil fuel sources. In the US, hydropower is produced at around 0.85 cents per kilowatt-hour, which is about 40% the cost of fossil fuels. Additionally, hydropower offers flexibility in design and can be structured to meet baseload and peak demands. It also provides benefits beyond electricity generation, such as flood control, irrigation support, and clean drinking water. However, there are concerns about the environmental impact of hydropower, with some research indicating that dams may contribute more to greenhouse gas emissions and negatively impact local ecosystems and habitats.
| Characteristics | Values |
|---|---|
| Levelized cost of electricity | Hydropower has the lowest levelized cost of electricity across all major fossil fuel and renewable energy sources. |
| Cost comparison | In the U.S., hydropower costs 0.85 cents per kilowatt-hour (kwh), which is about 40% the cost of fossil fuels. |
| Fuel costs | Hydropower prices don't depend on unpredictable changes in fuel costs. |
| Maintenance and operations | Hydropower has relatively low maintenance, operations, and fuel costs when compared with other electricity sources across a full project lifetime. |
| Job creation | Hydropower is an established industry in the U.S., employing 66,500 people. The U.S. hydropower workforce could grow to 120,000 jobs by 2030 and 158,000 by 2050. |
| Environmental impact | Hydropower is regarded as a clean electricity source and can help combat climate change. However, there is some debate about the impact of hydropower on greenhouse gas emissions, with some research suggesting that hydropower reservoirs may be a significant contributor of methane. |
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What You'll Learn
Hydropower costs less than fossil fuels
Hydropower is a proven source of affordable, clean electricity. It is regarded as the most mature, reliable, and cost-effective renewable power generation technology available in the world. Importantly, hydropower costs are not subject to unpredictable changes in fuel prices, unlike fossil fuels. This means that hydropower has the lowest levelized cost of electricity across all major fossil fuel and renewable energy sources.
In the US, hydropower is produced for an average of 0.85 cents per kilowatt-hour (kWh). This is about 40% the cost of fossil fuels and 25% the cost of using natural gas. States like Idaho, Washington, and Oregon, which get most of their electricity from hydropower, have lower energy bills than the rest of the country.
Hydropower is also a flexible source of energy. Some hydropower facilities can quickly go from zero power to maximum output, providing essential backup power during major electricity outages. Additionally, hydropower provides benefits beyond electricity generation, including flood control, irrigation support, and clean drinking water.
While there are some concerns about the greenhouse gas emissions associated with hydropower, particularly methane, it is still considered a more environmentally friendly option than fossil fuels. The US avoids approximately 200 million metric tons of CO2 annually due to hydropower, which is the equivalent of taking 42 million cars off the road.
Overall, hydropower is a cost-effective and reliable source of electricity that can help combat climate change and provide energy to those in need without breaking the bank.
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Hydropower is more reliable than fossil fuels
Hydropower is a more reliable energy source than fossil fuels. It is a renewable energy source that relies on the water cycle, which is driven by the sun. This makes it a more consistent and dependable source of energy compared to finite fossil fuels, which are subject to resource depletion and supply chain disruptions.
Hydropower has the lowest levelized cost of electricity across all major fossil fuel and renewable energy sources. This is because hydropower prices are not influenced by unpredictable changes in fuel costs, as they rely solely on the power of moving water. This stability in pricing makes hydropower a more reliable option for long-term energy planning and budgeting.
The flexibility of hydropower operations further enhances its reliability. Hydropower plants can be designed to meet baseload and peak demands, ensuring a steady supply of electricity to meet varying energy requirements. Additionally, technologies like pumped storage hydropower (PSH) can store energy, providing a buffer during periods of high demand or fluctuations in water levels.
Hydropower is also a more environmentally sustainable option, producing low-carbon electricity and avoiding significant carbon emissions associated with fossil fuels. According to the International Hydropower Association (IHA), replacing hydropower with coal for electricity generation would result in over 4 billion metric tons of additional greenhouse gas emissions annually.
The development of hydropower infrastructure has positive economic implications as well. It creates jobs, boosts local economies, and keeps energy costs low for consumers. In the United States, states that primarily rely on hydropower, such as Idaho, Washington, and Oregon, have lower energy bills than the rest of the country.
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Hydropower is a domestic energy source
Hydropower is also a flexible and established industry, providing jobs in various sectors, including manufacturing, utilities, professional services, and construction. It is estimated that the US hydropower workforce could expand to 120,000 jobs by 2030 and 158,000 jobs by 2050. Additionally, hydropower plants can quickly adjust their output, making them essential for providing backup power during major electricity outages.
The cost-effectiveness of hydropower is another advantage. Hydropower has the lowest levelized cost of electricity compared to all major fossil fuel and renewable energy sources, and it is even more cost-effective than some energy efficiency options. In the US, hydropower is produced at around 0.85 cents per kilowatt-hour, which is significantly lower than the cost of fossil fuels and natural gas. This affordability translates into lower electricity bills for consumers in states that heavily rely on hydropower, such as Idaho, Washington, and Oregon.
However, it is important to acknowledge that hydropower development has potential drawbacks. The construction of dams can have profound impacts on local ecosystems and habitats, and the aging of reservoirs may lead to inefficiencies. Additionally, there are concerns about the greenhouse gas emissions associated with hydropower, particularly methane emissions from flooded regions. Nevertheless, hydropower remains a significant contributor to clean energy globally, and its development is particularly prominent in Latin America and Asia, where it is seen as a promising solution for the need for affordable and sustainable electricity and irrigation.
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Hydropower has lower maintenance costs
Hydropower is one of the most inexpensive forms of renewable energy over time. While there are high upfront costs associated with hydropower, once the necessary infrastructure is constructed, there are lower maintenance requirements for upkeep than other forms of energy. Hydropower relies only on the power of moving water, so hydro prices don't depend on unpredictable changes in fuel costs. This means that hydropower has a lower levelized cost of electricity across all major fossil fuel and renewable energy sources.
Hydropower is also a mature, reliable, and cost-effective renewable power generation technology. It produces around 16% of the world's electricity and over 80% of the world's renewable electricity. More than 25 countries depend on hydropower for 90% of their electricity supply, and 12 countries are 100% reliant on hydropower. Hydropower is also used at some level by more than 150 countries.
The upfront costs for large hydropower facilities include civil construction works (such as the building of dams, tunnels, and other infrastructure) and electromechanical equipment costs (electricity-generating machinery). However, these costs can be minimized at the planning stage through the proper selection of location and design. Hydropower is also more flexible in design and can be structured to meet baseload and peak demands.
Hydropower facilities also have the benefit of being able to provide a source of irrigation for crops in surrounding areas, especially in areas where rain is scarce and droughts are common. Hydropower reservoirs can be used as a clean and reliable source of freshwater.
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Hydropower has higher greenhouse gas emissions
It is a common misconception that hydropower is a clean source of power because it does not involve burning dirty fossil fuels. However, hydropower reservoirs can emit greenhouse gases due to the decomposition of flooded organic material. The Intergovernmental Panel on Climate Change's (IPCC) Fifth Assessment Report noted that only wind and nuclear power have lower median lifecycle greenhouse gas emissions than hydropower. The report stated that hydropower has a median greenhouse gas (GHG) emission intensity of 24 gCO₂-eq/kWh. By comparison, the median figure for gas is 490 gCO₂-eq/kWh.
Independent research suggests that the use of hydropower instead of fossil fuels for electricity generation has helped to avoid more than 100 billion tonnes of carbon dioxide in the past 50 years alone. This is roughly equivalent to the total annual carbon footprint of the United States for 20 years. If hydropower was replaced with burning coal to generate electricity, the International Hydropower Association (IHA) estimates that more than 4 billion metric tonnes of additional greenhouse gases would be emitted annually, and global emissions from fossil fuels and industry would be at least 10% higher.
However, it is important to note that the methods for analyzing GHG emissions from hydropower reservoirs need to be refined to ensure accuracy and consistency. The G-res Tool, devised by the IHA and UNESCO, enables companies, investors, and researchers to more accurately estimate the net change in greenhouse gas (GHG) emissions attributable to the creation of a specific reservoir. This tool evaluates the land's pre-impoundment state, including natural emissions and those from human activities over the reservoir's lifespan.
While hydropower has been shown to have a lower levelized cost of electricity compared to fossil fuels, it is important to consider the environmental impact of this energy source, including its greenhouse gas emissions. The levelized cost of electricity for hydropower is approximately 0.85 cents per kilowatt-hour (kWh), which is about 40% the cost of fossil fuels. Hydropower is also free from dependence on volatile fuel prices, making it a more cost-stable option.
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Frequently asked questions
Hydropower has the lowest levelized cost of electricity across all major fossil fuel and renewable energy sources. In the US, hydropower is produced for an average of 0.85 cents per kilowatt-hour (kWh), which is about 40% the cost of fossil fuels.
Hydropower is fueled by the power of moving water, so its prices don't depend on unpredictable changes in fuel costs. This means that much of the money invested in hydropower stays in the country where it is produced.
Hydropower is a proven source of low-carbon, long-term, reliable baseload electricity generation. It also provides benefits beyond electricity generation, including flood control, irrigation support, and clean drinking water. Additionally, hydropower creates jobs and boosts local economies. However, it is worth noting that in some cases, greenhouse gas emissions from hydropower can be higher than those of comparable fossil fuel power plants.
