Overview

The Baihetan Dam is a major hydroelectric powerplant located in southwest China, situated on the Jinsha River. The Jinsha River forms an upper stretch of the Yangtze River, and the dam spans the border region of Sichuan and Yunnan provinces. This facility represents a significant milestone in regional energy infrastructure, recognized as the second largest hydropower plant in the world. It is also considered to be the last large hydropower project in China, following a series of major developments that began with the Three Gorges Dam.

Structurally, the Baihetan Dam is a double-curvature arch dam with a total height of 289 meters. The crest elevation reaches 827 meters above sea level. The dam’s base measures 72 meters in width, tapering to 13 meters at the crest. These dimensions support the massive hydraulic head required to drive the station’s generating units. The design reflects advanced engineering standards for high-head arch dams, optimizing material usage while maintaining structural integrity under significant water pressure.

The hydropower station is equipped with 16 hydro-generating units. Each unit has an individual capacity of 1 gigawatt, making them the world's largest turbines in terms of single-unit output. The combined installed capacity of the plant is 16000 MW. All 16 hydro-generating units became fully operational on 20 December 2022, marking the completion of the primary commissioning phase. The operator of the facility is China Three Gorges Corporation, which manages the operational status and maintenance of the plant. The dam remains operational, contributing significantly to the regional grid and the broader Chinese energy mix.

Why it matters

The Baihetan Dam represents a pivotal milestone in global hydroelectric engineering, recognized as the second largest hydropower plant in the world. Its completion marks the culmination of a major era of large-scale dam construction in China, following a series of significant projects that began with the Three Gorges Dam. The facility is considered the last large hydropower project in China within this specific developmental sequence, signaling a potential shift in the nation's approach to massive river infrastructure. Located on the Jinsha River, an upper stretch of the Yangtze River spanning Sichuan and Yunnan provinces, the dam serves as a critical node in the region's energy matrix. The operational status of the plant, fully commissioned with all units online by 20 December 2022, underscores its immediate and substantial contribution to the national grid.

Record-Breaking Turbine Technology

Technological innovation is a defining feature of the Baihetan Dam. The hydropower station is equipped with 16 hydro-generating units, each possessing a capacity of 1 gigawatt. These are recognized as the world's largest turbines, setting a new benchmark for unit output in the hydroelectric sector. This concentration of power in individual units allows for greater efficiency and streamlined maintenance compared to earlier generations of hydro plants that relied on smaller, more numerous units. The scale of these turbines reflects the advanced engineering capabilities of the operator, China Three Gorges Corporation, and highlights the technological maturity of Chinese hydropower infrastructure. The successful deployment of these 1 GW units demonstrates the feasibility of ultra-large-scale hydro generation, influencing future designs for mega-dams globally.

Strategic Role in Clean Energy Corridors

Beyond its immediate capacity, the Baihetan Dam plays a strategic role in the formation of what has been described as the 'world's largest clean energy corridor'. By harnessing the flow of the Jinsha River, the dam contributes significantly to the diversification of China's energy mix, reducing reliance on fossil fuels. The integration of such a massive renewable energy source into the grid enhances energy security and supports the broader goals of carbon neutrality. The dam's location in southwest China allows for efficient transmission of power to industrial centers further east, optimizing the geographic distribution of energy production and consumption. This strategic positioning reinforces the dam's importance not just as a standalone power plant, but as a key component of a larger, interconnected clean energy network.

How does the Baihetan Dam generate power?

The Baihetan Dam generates electricity through a sophisticated arrangement of 16 hydro-generating units, each rated at 1 gigawatt, making them the largest turbines in the world. These units are housed within the 289-meter-tall double-curvature arch dam structure, which spans the Jinsha River in southwest China. The dam’s crest elevation is 827 m, with a base width of 72 m and a crest width of 13 m, providing the hydraulic head necessary to drive these massive generators.

Turbine Specifications

The 16 hydro-generating units are the core of the Baihetan hydropower station’s output. Each unit has a capacity of 1 gigawatt, contributing to the plant’s total installed capacity of 16,000 MW. While specific technical details such as turbine height, weight, and operating voltage are not explicitly detailed in the provided grounding, the scale of these units is unprecedented in global hydropower. The turbines are designed to maximize efficiency under the high hydraulic pressure provided by the Jinsha River’s flow and the dam’s significant elevation difference.

Parameter Value
Number of Units 16
Capacity per Unit 1 GW
Total Capacity 16,000 MW
Turbine Type Hydro-generating units
Commissioning Date 20 December 2022

Transmission Infrastructure

The electricity generated at Baihetan is transmitted via a robust infrastructure network. A substation located in Butuo County plays a key role in this process. The power is initially transmitted at 500 kV AC and then converted to 800 kV DC for long-distance transmission, optimizing efficiency for delivering energy to major consumption centers in China. This conversion is critical for minimizing losses over the extensive grid network that distributes power from the Jinsha River basin to regions across the country.

What is the history of the Baihetan Dam project?

The development of the Baihetan Dam spans several decades, reflecting broader geopolitical and economic shifts in China. Early interest in the Jinsha River’s hydropower potential emerged in the mid-20th century. In 1959, a preliminary survey was conducted by a joint team of domestic and Czechoslovak experts to assess the site’s viability. However, the project faced its first major setback in 1962, when the Sino-Soviet split led to the withdrawal of international technical support, effectively pausing progress for nearly three decades. The initiative was revived in 1992 as part of China’s broader strategy to develop the upper Yangtze River basin. This restart aligned with the momentum generated by the Three Gorges Dam project, positioning Baihetan as a critical downstream component in the regional energy grid. Construction officially began in 2008, marking the transition from planning to physical realization. The project proceeded through multiple phases, including foundation excavation, concrete pouring for the double-curvature arch dam, and the installation of generating equipment. The dam reached significant structural milestones in the late 2010s, with the crest elevation achieving its final height of 827 m. The most critical operational phase involved the integration of 16 hydro-generating units, each with a capacity of 1 gigawatt. These turbines were recognized as the world’s largest at the time of installation. The final unit was commissioned on 20 December 2022, marking the full operational status of the station. This completion date concluded the main construction era and positioned Baihetan as the second-largest hydropower plant in the world. The project’s timeline reflects a complex interplay of early technical assessment, geopolitical disruption, and rapid modern engineering execution.

Project Timeline

Year Event
1959 Preliminary survey conducted by domestic and Czechoslovak experts.
1962 Project paused following the Sino-Soviet split and withdrawal of technical support.
1992 Project restart as part of the upper Yangtze River basin development strategy.
2008 Official start of construction.
2022 All 16 hydro-generating units become fully operational on 20 December.

Engineering and structural specifications

The structure has a crest elevation of 827 m, a base width of 72 m, and a crest width of 13 m. This design is characteristic of large arch dams that rely on the curvature of the structure to transfer the water load to the abutments of the river valley. The dam is located on the Jinsha River, which is an upper stretch of the Yangtze River in Sichuan and Yunnan provinces in southwest China.

Hydro-generating units

The operational status of the plant is currently operational. The operator of the facility is China Three Gorges Corporation.

Construction timeline

The construction period for the Baihetan Dam was noted by experts as exceptionally fast, spanning 4 years. It is also the second largest hydropower plant in the world. The commissioning of the plant is recorded as 2022.

What are the environmental and economic impacts?

The construction and operation of the Baihetan Dam have generated significant socioeconomic and environmental changes in the Jinsha River valley, particularly within Qiaojia County in Sichuan Province. The project required the resettlement of 32 villages, displacing 50,178 residents from their ancestral lands to accommodate the reservoir and infrastructure. This large-scale human migration represents one of the most substantial demographic shifts associated with China’s recent hydropower expansion, following the precedent set by the Three Gorges Dam. The resettlement process involved the development of new housing complexes, social infrastructure, and economic support systems to integrate displaced communities into the evolving regional economy.

Economic Development and Infrastructure

Beyond the immediate displacement, the Baihetan Dam project has served as a catalyst for regional economic development. The construction phase generated thousands of jobs, ranging from skilled engineering positions to general labor roles, providing income stability for local households and attracting migrant workers from surrounding provinces. These employment opportunities have stimulated local markets, increased demand for services, and contributed to the diversification of the regional economic base, which had previously relied heavily on agriculture and small-scale mining.

Infrastructure improvements have been a critical component of the dam’s economic impact. The need to transport heavy equipment, concrete, and personnel to the remote gorge location led to significant upgrades in the local road network. These improvements have enhanced connectivity between Qiaojia County and neighboring administrative regions, facilitating trade, reducing travel times, and improving access to healthcare and education for the broader population. The enhanced infrastructure continues to support economic activity well beyond the initial construction phase, providing long-term benefits to the local economy.

Environmental and Carbon Savings

From an environmental perspective, the Baihetan Dam contributes to China’s broader energy transition by displacing fossil fuel-based power generation. The hydropower station’s annual output results in the saving of approximately 90 million tons of coal, reducing the reliance on thermal power plants in the Yangtze River basin and beyond. This displacement of coal consumption leads to an estimated annual reduction of 248 million tonnes of carbon emissions, contributing significantly to China’s climate goals and air quality improvements in major downstream cities.

The environmental benefits extend beyond carbon savings. By utilizing the kinetic energy of the Jinsha River, the Baihetan Dam reduces the extraction, transportation, and combustion of coal, thereby decreasing associated pollutants such as sulfur dioxide, nitrogen oxides, and particulate matter. These reductions contribute to improved public health outcomes in regions heavily dependent on thermal power, aligning with national strategies to mitigate the environmental footprint of energy production. As the second-largest hydropower plant in the world, the Baihetan Dam plays a pivotal role in balancing China’s energy mix and advancing its renewable energy capacity.

Role in the Yangtze River clean energy corridor

The Baihetan Dam functions as a critical component of the Yangtze River clean energy corridor, a strategic infrastructure network designed to harness the hydropower potential of the Jinsha River, the upper stretch of the Yangtze River. Located in southwest China, spanning Sichuan and Yunnan provinces, this facility operates in concert with other major hydropower projects, including the Three Gorges Dam, Wudongde Dam, Xiluodu Dam, and Xiangjiaba Dam. This series of dams represents a coordinated effort to produce and transmit renewable energy from western China to the energy-demanding cities in the east. The Baihetan project is considered the last large hydropower project in China following this sequence of developments starting with the Three Gorges Dam.

As the second largest hydropower plant in the world, Baihetan significantly contributes to the regional energy mix with a total capacity of 16000 MW. The operator, China Three Gorges Corporation, manages the facility as part of the broader operational strategy for the Yangtze River basin.

Beyond electricity generation, the dam provides additional benefits including flood control, navigation improvements, and sand blocking. The structure is a 289-meter-tall double-curvature arch dam with a crest elevation of 827 m. Its dimensions include a width of 72 m at the base and 13 m at the crest. These engineering specifications allow the dam to effectively regulate water flow along the Jinsha River, enhancing the overall efficiency of the Yangtze River clean energy corridor. The integration of Baihetan with neighboring dams like Wudongde, Xiluodu, and Xiangjiaba creates a cascading effect that optimizes water usage and power output across the region. This infrastructure supports the transmission of renewable energy over long distances, reducing reliance on fossil fuels in eastern urban centers. The operational status of the dam as of 2022 ensures continuous contribution to the national grid and regional stability.

See also