Name: Longkaikou Dam: Hydroelectric Infrastructure on the Jinsha River
Address: CN

Overview

The Longkaikou Dam is an operational hydroelectric powerplant located in Heqing County, within the Dali Bai Autonomous Prefecture of Yunnan province, China. It is a gravity dam constructed on the Jinsha River, utilizing roller-compacted concrete for its structural integrity. The facility has a total installed capacity of 1800 MW, generated by five Francis turbine-generators, each with a capacity of 360 MW. The dam stands 119 m high and plays a significant role in the regional energy infrastructure of southwestern China.

Construction and Commissioning History

Construction of the Longkaikou Dam began in 2007, with the Jinsha River being diverted in January 2009 to facilitate building activities. However, the project faced regulatory scrutiny when the Ministry of Environmental Protection briefly halted construction in June 2009 due to the dam being built without full approval. Following the resolution of these environmental and administrative issues, construction resumed, leading to the impoundment of the reservoir on 25 November 2012.

The first of the five 360 MW Francis turbine-generators was commissioned on 21 May 2013, marking the beginning of the plant's operational phase. The remaining four units were commissioned later that year, with the final unit coming online on 29 November 2013, bringing the plant to its full 1800 MW capacity. The dam is currently operated by an unspecified operator, as detailed in available sources.

The development of the Longkaikou Dam had notable social and environmental implications for the local area. The project was expected to displace approximately 2,000 people from the surrounding regions to accommodate the reservoir and infrastructure. To mitigate ecological impacts on the Jinsha River's aquatic life, the dam supports a fish proliferation system designed to enhance fish populations and maintain biodiversity in the water body. These measures reflect the broader challenges of balancing hydroelectric expansion with environmental conservation in China's major river basins.

Construction History

Construction of the Longkaikou Dam began in 2007 on the Jinsha River in Dali Bai Autonomous Prefecture, Yunnan province, China. The project utilized roller-compacted concrete to build the 119 m gravity dam structure.

Initial Phases and Environmental Halt

River diversion was completed in January 2009, marking a significant early milestone in the construction sequence. However, progress was interrupted later that year. In June 2009, the Ministry of Environmental Protection briefly halted construction activities because the dam was being built without the necessary environmental approval. This regulatory intervention highlighted the procedural requirements for major hydroelectric infrastructure in the region during that period.

Completion and Commissioning

Following the resolution of the environmental approval issues, construction resumed and accelerated. On 25 November 2012, the reservoir was officially impounded. The commissioning of the generating units occurred in 2013. The final unit was commissioned on 29 November 2013, completing the installation of the 1800 MW capacity.

Year	Event
2007	Construction begins on the Longkaikou Dam.
January 2009	The Jinsha River is diverted.
June 2009	Construction is briefly halted by the Ministry of Environmental Protection due to lack of approval.
25 November 2012	The reservoir is impounded.
21 May 2013	The first 360 MW Francis turbine-generator is commissioned.
29 November 2013	The last turbine-generator is commissioned.

Technical Specifications

The Longkaikou Dam is constructed as a gravity dam utilizing roller-compacted concrete (RCC) technology. This structural approach allows for efficient construction and robust stability against the hydrostatic pressure of the Jinsha River. The dam rises to a height of 119 m (390 ft), forming the primary barrier for the reservoir. Construction of this RCC structure began in 2007, with the river diversion occurring in January 2009. The use of roller-compacted concrete is a key technical feature of the project, distinguishing it from traditional cast-in-place concrete gravity dams. The power generation capacity of the Longkaikou Dam is provided by five Francis turbine-generators. Each unit has a capacity of 360 MW, contributing to the plant's total installed capacity of 1800 MW. The first of these five Francis turbines was commissioned on 21 May 2013, following the initial impounding of the reservoir on 25 November 2012. The commissioning process concluded with the last unit coming online on 29 November 2013. The Francis turbine is a type of reaction turbine widely used in hydroelectric power generation, suitable for the head and flow conditions of the Jinsha River at this location. The dam also incorporates a fish proliferation system to mitigate environmental impacts on local aquatic life. This system is designed to support fish migration and breeding, addressing ecological concerns associated with the reservoir's creation. The project was expected to displace 2,000 people, highlighting the social and environmental considerations integrated into the dam's operational and structural design.

Technical Specification	Value
Dam Type	Gravity Dam
Construction Material	Roller-Compacted Concrete (RCC)
Dam Height	119 m (390 ft)
Number of Turbines	5
Turbine Type	Francis Turbine-Generators
Capacity per Unit	360 MW
Total Installed Capacity	1800 MW
First Unit Commissioned	21 May 2013
Last Unit Commissioned	29 November 2013
Environmental Feature	Fish Proliferation System

Why it matters

The Longkaikou Dam represents a significant node in the extensive hydroelectric development of the Jinsha River, a major tributary of the Yangtze River in southwestern China. As part of the broader cascade of dams along this waterway, the facility contributes to China’s strategic expansion of renewable energy infrastructure, leveraging the river’s substantial flow and elevation drop to generate electricity. The dam’s 1800 MW capacity, derived from five 360 MW Francis turbine-generators, underscores its role in stabilizing regional power supply and supporting industrial growth in Yunnan province. Its construction and operational timeline reflect both the rapid pace of China’s hydroelectric ambitions and the growing scrutiny of environmental governance in large-scale infrastructure projects.

Role in the Jinsha River Cascade

The Jinsha River has emerged as one of the most intensively developed hydroelectric corridors in the world, with the Longkaikou Dam forming a critical link in this network. Located in the Dali Bai Autonomous Prefecture, the gravity dam utilizes roller-compacted concrete technology to manage the river’s flow efficiently. The commissioning of the first turbine on 21 May 2013, followed by the final unit on 29 November 2013, marked a key phase in the river’s energy potential realization. This sequential commissioning allowed for gradual integration into the regional grid, minimizing disruption while maximizing output. The dam’s 119 m height and strategic positioning enable it to regulate water flow for downstream hydropower plants, enhancing the overall efficiency of the cascade system. By contributing to the Jinsha River’s total generating capacity, the Longkaikou Dam supports China’s broader goal of diversifying its energy mix and reducing reliance on coal-fired power stations.

Environmental Approval Controversies

The construction of the Longkaikou Dam was not without controversy, particularly regarding environmental approvals. In June 2009, the Ministry of Environmental Protection briefly halted construction after discovering that the project had proceeded without full regulatory approval. This incident highlighted tensions between rapid infrastructure development and environmental oversight in China. The river diversion in January 2009 had already begun, indicating that preliminary works were underway before the formal green light was secured. The subsequent halt underscored the increasing importance of environmental impact assessments in large-scale hydroelectric projects. Despite the delay, construction resumed, and the reservoir was impounded on 25 November 2012, demonstrating the project’s resilience and the prioritization of energy output. The controversy also brought attention to the social impacts, with the dam expected to displace approximately 2,000 people, raising questions about compensation and resettlement strategies.

Beyond its energy contributions, the Longkaikou Dam incorporates features aimed at mitigating ecological impacts. The inclusion of a fish proliferation system reflects efforts to maintain biodiversity in the Jinsha River, which is home to diverse aquatic species. This system likely involves fish ladders or spawning areas to facilitate migration and reproduction, although specific details are not extensively documented in the provided sources. The displacement of 2,000 people highlights the social cost of such infrastructure, emphasizing the need for comprehensive resettlement plans. These considerations are increasingly central to the evaluation of hydroelectric projects in China, where balancing energy demands with environmental and social sustainability remains a key challenge. The Longkaikou Dam thus serves as a case study in the complexities of modern hydroelectric development, illustrating both the benefits and the trade-offs associated with large-scale infrastructure in ecologically sensitive regions.

What are the environmental impacts of the Longkaikou Dam?

The construction of the Longkaikou Dam on the Jinsha River in Yunnan province was marked by significant environmental scrutiny, most notably a regulatory intervention that temporarily halted progress. In June 2009, the Ministry of Environmental Protection stopped construction activities because the project was proceeding without the required environmental approval. This halt occurred shortly after the river was diverted in January 2009, highlighting the tension between rapid infrastructure development and environmental compliance in the region. The regulatory pause underscored the growing importance of environmental impact assessments for large-scale hydroelectric projects in China during that period.

Human Displacement

One of the primary social and environmental impacts of the Longkaikou Dam was the displacement of the local population. These residents, primarily located in the Dali Bai Autonomous Prefecture, faced relocation to accommodate the impoundment of the Jinsha River. The displacement represents a significant demographic shift for the local communities, affecting livelihoods, housing, and social structures. The scale of relocation is typical for major gravity dams in the region, where the reservoir footprint often encompasses fertile river valleys and established settlements.

Ecological Mitigation: Fish Proliferation

To address ecological concerns related to the Jinsha River ecosystem, the Longkaikou Dam incorporates a fish proliferation system. This infrastructure is designed to support the reproduction and migration of native fish species, which are often disrupted by the physical barrier of the dam and changes in water flow. The fish proliferation system helps mitigate the impact on aquatic biodiversity, ensuring that key species can continue to thrive in the reservoir and downstream areas. This feature reflects a broader trend in Chinese hydroelectric projects to integrate ecological mitigation measures to balance energy production with environmental preservation.

Operational Details

The operational history of the Longkaikou Dam is defined by a sequence of critical construction milestones and a compressed commissioning schedule for its power generation units. Despite this interruption, the project advanced to the critical phase of river diversion in January 2009, setting the stage for the reservoir's formation.

Reservoir Impoundment

The impoundment of the reservoir was a pivotal event in the dam's operational timeline. This process was completed on 25 November 2012, marking the moment when the Jinsha River was effectively held back by the 119-meter-high roller-compacted concrete gravity structure. The successful impoundment allowed for the stabilization of water levels necessary to drive the hydroelectric turbines and initiated the ecological adjustments for the downstream river flow, including the activation of the fish proliferation system designed to mitigate environmental impact.

Turbine Commissioning

The power station is equipped with five Francis turbine-generators, each with a capacity of 360 MW, contributing to the plant's total installed capacity of 1800 MW. The commissioning of these units occurred in rapid succession over a seven-month period in 2013. The first turbine-generator was officially commissioned on 21 May 2013, initiating electricity production for the grid. The remaining four units followed in quick succession, with the final turbine being commissioned on 29 November 2013. This efficient rollout allowed the Longkaikou Dam to reach full operational status within a single calendar year, maximizing the energy output from the Jinsha River's flow in the Dali Bai Autonomous Prefecture.