Electrification
Visualizing the World’s Largest Hydroelectric Dams
Visualizing the World’s Largest Hydroelectric Dams
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.
Electrification
Visualized: What is the Cost of Electric Vehicle Batteries?
The cost of electric vehicle batteries can vary based on size and chemical composition. Here are the battery costs of six popular EV models.

What is the Cost of Electric Vehicle Batteries?
The cost of an electric vehicle (EV) battery pack can vary depending on composition and chemistry.
In this graphic, we use data from Benchmark Minerals Intelligence to showcase the different costs of battery cells on popular electric vehicles.
Size Matters
Some EV owners are taken by surprise when they discover the cost of replacing their batteries.
Depending on the brand and model of the vehicle, the cost of a new lithium-ion battery pack might be as high as $25,000:
Vehicle | Battery Type | Battery Capacity | Battery Cost | Total Cost of EV |
---|---|---|---|---|
2025 Cadillac Escalade IQ | Nickel Cobalt Manganese Aluminum (NCMA) | 200 kWh | $22,540 | $130,000 |
2023 Tesla Model S | Nickel Cobalt Aluminum (NCA) | 100 kWh | $12,030 | $88,490 |
2025 RAM 1500 REV | Nickel Cobalt Manganese (NCM) | 229 kWh | $25,853 | $81,000 |
2022 Rivian Delivery Van | Lithium Iron phosphate (LFP) | 135 kWh | $13,298 | $52,690 |
2023 Ford Mustang | Lithium Iron Phosphate (LFP) | 70 kWh | $6,895 | $43,179 |
2023 VW ID.4 | Nickel Cobalt Manganese (NCM622) | 62 kWh | $8,730 | $37,250 |
The price of an EV battery pack can be shaped by various factors such as raw material costs, production expenses, packaging complexities, and supply chain stability. One of the main factors is chemical composition.
Graphite is the standard material used for the anodes in most lithium-ion batteries.
However, it is the mineral composition of the cathode that usually changes. It includes lithium and other minerals such as nickel, manganese, cobalt, or iron. This specific composition is pivotal in establishing the battery’s capacity, power, safety, lifespan, cost, and overall performance.
Lithium nickel cobalt aluminum oxide (NCA) battery cells have an average price of $120.3 per kilowatt-hour (kWh), while lithium nickel cobalt manganese oxide (NCM) has a slightly lower price point at $112.7 per kWh. Both contain significant nickel proportions, increasing the battery’s energy density and allowing for longer range.
At a lower cost are lithium iron phosphate (LFP) batteries, which are cheaper to make than cobalt and nickel-based variants. LFP battery cells have an average price of $98.5 per kWh. However, they offer less specific energy and are more suitable for standard- or short-range EVs.
Which Battery Dominates the EV Market?
In 2021, the battery market was dominated by NCM batteries, with 58% of the market share, followed by LFP and NCA, holding 21% each.
Looking ahead to 2026, the market share of LFP is predicted to nearly double, reaching 38%.
NCM is anticipated to constitute 45% of the market and NCA is expected to decline to 7%.
Electrification
How Clean is the Nickel and Lithium in a Battery?
This graphic from Wood Mackenzie shows how nickel and lithium mining can significantly impact the environment, depending on the processes used.

How Clean is the Nickel and Lithium in a Battery?
The production of lithium (Li) and nickel (Ni), two key raw materials for batteries, can produce vastly different emissions profiles.
This graphic from Wood Mackenzie shows how nickel and lithium mining can significantly impact the environment, depending on the processes used for extraction.
Nickel Emissions Per Extraction Process
Nickel is a crucial metal in modern infrastructure and technology, with major uses in stainless steel and alloys. Nickel’s electrical conductivity also makes it ideal for facilitating current flow within battery cells.
Today, there are two major methods of nickel mining:
-
From laterite deposits, which are predominantly found in tropical regions. This involves open-pit mining, where large amounts of soil and overburden need to be removed to access the nickel-rich ore.
-
From sulphide ores, which involves underground or open-pit mining of ore deposits containing nickel sulphide minerals.
Although nickel laterites make up 70% of the world’s nickel reserves, magmatic sulphide deposits produced 60% of the world’s nickel over the last 60 years.
Compared to laterite extraction, sulphide mining typically emits fewer tonnes of CO2 per tonne of nickel equivalent as it involves less soil disturbance and has a smaller physical footprint:
Ore Type | Process | Product | Tonnes of CO2 per tonne of Ni equivalent |
---|---|---|---|
Sulphides | Electric / Flash Smelting | Refined Ni / Matte | 6 |
Laterite | High Pressure Acid Leach (HPAL) | Refined Ni / Mixed Sulpide Precipitate / Mixed Hydroxide Precipitate | 13.7 |
Laterite | Blast Furnace / RKEF | Nickel Pig Iron / Matte | 45.1 |
Nickel extraction from laterites can impose significant environmental impacts, such as deforestation, habitat destruction, and soil erosion.
Additionally, laterite ores often contain high levels of moisture, requiring energy-intensive drying processes to prepare them for further extraction. After extraction, the smelting of laterites requires a significant amount of energy, which is largely sourced from fossil fuels.
Although sulphide mining is cleaner, it poses other environmental challenges. The extraction and processing of sulphide ores can release sulphur compounds and heavy metals into the environment, potentially leading to acid mine drainage and contamination of water sources if not managed properly.
In addition, nickel sulphides are typically more expensive to mine due to their hard rock nature.
Lithium Emissions Per Extraction Process
Lithium is the major ingredient in rechargeable batteries found in phones, hybrid cars, electric bikes, and grid-scale storage systems.
Today, there are two major methods of lithium extraction:
-
From brine, pumping lithium-rich brine from underground aquifers into evaporation ponds, where solar energy evaporates the water and concentrates the lithium content. The concentrated brine is then further processed to extract lithium carbonate or hydroxide.
-
Hard rock mining, or extracting lithium from mineral ores (primarily spodumene) found in pegmatite deposits. Australia, the world’s leading producer of lithium (46.9%), extracts lithium directly from hard rock.
Brine extraction is typically employed in countries with salt flats, such as Chile, Argentina, and China. It is generally considered a lower-cost method, but it can have environmental impacts such as water usage, potential contamination of local water sources, and alteration of ecosystems.
The process, however, emits fewer tonnes of CO2 per tonne of lithium-carbonate-equivalent (LCE) than mining:
Source | Ore Type | Process | Tonnes of CO2 per tonne of LCE |
---|---|---|---|
Mineral | Spodumene | Mine | 9 |
Mineral | Petalite, lepidolite and others | Mine | 8 |
Brine | N/A | Extraction/Evaporation | 3 |
Mining involves drilling, blasting, and crushing the ore, followed by flotation to separate lithium-bearing minerals from other minerals. This type of extraction can have environmental impacts such as land disturbance, energy consumption, and the generation of waste rock and tailings.
Sustainable Production of Lithium and Nickel
Environmentally responsible practices in the extraction and processing of nickel and lithium are essential to ensure the sustainability of the battery supply chain.
This includes implementing stringent environmental regulations, promoting energy efficiency, reducing water consumption, and exploring cleaner technologies. Continued research and development efforts focused on improving extraction methods and minimizing environmental impacts are crucial.
Sign up to Wood Mackenzie’s Inside Track to learn more about the impact of an accelerated energy transition on mining and metals.
-
Electrification2 years ago
Ranked: The Top 10 EV Battery Manufacturers
-
Electrification2 years ago
The Key Minerals in an EV Battery
-
Real Assets2 years ago
The World’s Top 10 Gold Mining Companies
-
Misc2 years ago
All the Metals We Mined in One Visualization
-
Misc3 years ago
All the World’s Metals and Minerals in One Visualization
-
Electrification2 years ago
The Biggest Mining Companies in the World in 2021
-
Energy Shift2 years ago
What Are the Five Major Types of Renewable Energy?
-
Electrification2 years ago
The World’s Largest Nickel Mining Companies