Energy
Visualizing the World’s Largest Hydroelectric Dams
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Visualizing the World’s Largest Hydroelectric Dams
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Did you know that hydroelectricity is the world’s biggest source of renewable energy? According to recent figures from the International Renewable Energy Agency (IRENA), it represents 40% of total capacity, ahead of solar (28%) and wind (27%).
This type of energy is generated by hydroelectric power stations, which are essentially large dams that use the water flow to spin a turbine. They can also serve secondary functions such as flow monitoring and flood control.
To help you learn more about hydropower, we’ve visualized the five largest hydroelectric dams in the world, ranked by their maximum output.
Overview of the Data
The following table lists key information about the five dams shown in this graphic, as of 2021. Installed capacity is the maximum amount of power that a plant can generate under full load.
Country | Dam | River | Installed Capacity (gigawatts) | Dimensions (meters) |
---|---|---|---|---|
🇨🇳 China | Three Gorges Dam | Yangtze River | 22.5 | 181 x 2,335 |
🇧🇷 Brazil / 🇵🇾 Paraguay | Itaipu Dam | Parana River | 14.0 | 196 x 7,919 |
🇨🇳 China | Xiluodu Dam | Jinsha River | 13.9 | 286 x 700 |
🇧🇷 Brazil | Belo Monte Dam | Xingu River | 11.2 | 90 X 3,545 |
🇻🇪 Venezuela | Guri Dam | Caroni River | 10.2 | 162 x 7,426 |
At the top of the list is China’s Three Gorges Dam, which opened in 2003. It has an installed capacity of 22.5 gigawatts (GW), which is close to double the second-place Itaipu Dam.
In terms of annual output, the Itaipu Dam actually produces about the same amount of electricity. This is because the Parana River has a low seasonal variance, meaning the flow rate changes very little throughout the year. On the other hand, the Yangtze River has a significant drop in flow for several months of the year.
For a point of comparison, here is the installed capacity of the world’s three largest solar power plants, also as of 2021:
- Bhadla Solar Park, India: 2.2 GW
- Hainan Solar Park, China: 2.2 GW
- Pavagada Solar Park, India: 2.1 GW
Compared to our largest dams, solar plants have a much lower installed capacity. However, in terms of cost (cents per kilowatt-hour), the two are actually quite even.
Closer Look: Three Gorges Dam
The Three Gorges Dam is an engineering marvel, costing over $32 billion to construct. To wrap your head around its massive scale, consider the following facts:
- The Three Gorges Reservoir (which feeds the dam) contains 39 trillion kg of water (42 billion tons)
- In terms of area, the reservoir spans 400 square miles (1,045 square km)
- The mass of this reservoir is large enough to slow the Earth’s rotation by 0.06 microseconds
Of course, any man-made structure this large is bound to have a profound impact on the environment. In a 2010 study, it was found that the dam has triggered over 3,000 earthquakes and landslides since 2003.
The Consequences of Hydroelectric Dams
While hydropower can be cost-effective, there are some legitimate concerns about its long-term sustainability.
For starters, hydroelectric dams require large upstream reservoirs to ensure a consistent supply of water. Flooding new areas of land can disrupt wildlife, degrade water quality, and even cause natural disasters like earthquakes.
Dams can also disrupt the natural flow of rivers. Other studies have found that millions of people living downstream from large dams suffer from food insecurity and flooding.
Whereas the benefits have generally been delivered to urban centers or industrial-scale agricultural developments, river-dependent populations located downstream of dams have experienced a difficult upheaval of their livelihoods.
– Richter, B.D. et al. (2010)
Perhaps the greatest risk to hydropower is climate change itself. For example, due to the rising frequency of droughts, hydroelectric dams in places like California are becoming significantly less economical.
Maps
Mapped: Renewable Energy and Battery Installations in the U.S. in 2023
This graphic describes new U.S. renewable energy installations by state along with nameplate capacity, planned to come online in 2023.

Renewable and Battery Installations in the U.S. in 2023
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Renewable energy, in particular solar power, is set to shine in 2023. This year, the U.S. plans to get over 80% of its new energy installations from sources like battery, solar, and wind.
The above map uses data from EIA to highlight planned U.S. renewable energy and battery storage installations by state for 2023.
Texas and California Leading in Renewable Energy
Nearly every state in the U.S. has plans to produce new clean energy in 2023, but it’s not a surprise to see the two most populous states in the lead of the pack.
Even though the majority of its power comes from natural gas, Texas currently leads the U.S. in planned renewable energy installations. The state also has plans to power nearly 900,000 homes using new wind energy.
California is second, which could be partially attributable to the passing of Title 24, an energy code that makes it compulsory for new buildings to have the equipment necessary to allow the easy installation of solar panels, battery storage, and EV charging.
New solar power in the U.S. isn’t just coming from places like Texas and California. In 2023, Ohio will add 1,917 MW of new nameplate solar capacity, with Nevada and Colorado not far behind.
Top 10 States | Battery (MW) | Solar (MW) | Wind (MW) | Total (MW) |
---|---|---|---|---|
Texas | 1,981 | 6,462 | 1,941 | 10,385 |
California | 4,555 | 4,293 | 123 | 8,970 |
Nevada | 678 | 1,596 | 0 | 2,274 |
Ohio | 12 | 1,917 | 5 | 1,934 |
Colorado | 230 | 1,187 | 200 | 1,617 |
New York | 58 | 509 | 559 | 1,125 |
Wisconsin | 4 | 939 | 92 | 1,034 |
Florida | 3 | 978 | 0 | 980 |
Kansas | 0 | 0 | 843 | 843 |
Illinois | 0 | 363 | 477 | 840 |
The state of New York is also looking to become one of the nation’s leading renewable energy providers. The New York State Energy Research & Development Authority (NYSERDA) is making real strides towards this objective with 11% of the nation’s new wind power projects expected to come online in 2023.
According to the data, New Hampshire is the only state in the U.S. that has no new utility-scale renewable energy installations planned for 2023. However, the state does have plans for a massive hydroelectric plant that should come online in 2024.
Decarbonizing Energy
Renewable energy is considered essential to reduce global warming and CO2 emissions.
In line with the efforts by each state to build new renewable installations, the Biden administration has set a goal of achieving a carbon pollution-free power sector by 2035 and a net zero emissions economy by no later than 2050.
The EIA forecasts the share of U.S. electricity generation from renewable sources rising from 22% in 2022 to 23% in 2023 and to 26% in 2024.
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