Name: Kajiwa Dam: Hydroelectric Infrastructure on the Muli River
Address: CN

Overview

The Kajiwa Dam is a significant hydroelectric infrastructure project located in the southwestern region of China, specifically within Sichuan Province. Situated on the Muli River, this facility serves as a key component of the regional energy grid in Muli Tibetan Autonomous County. The structure is engineered as a concrete-face rock-fill dam, a design choice that leverages local geological conditions to create a robust barrier for water retention and power generation. This specific dam type combines the flexibility of a rock-fill core with the impermeability of a concrete face, allowing for efficient management of the river's flow and hydrostatic pressure.

Commissioned in 2015, the Kajiwa Dam is currently operational and contributes to the growing capacity of hydropower in the Sichuan basin. The plant has an installed capacity of 452.4 MW, providing a substantial source of renewable energy for the surrounding areas. This output is generated through the conversion of the potential energy of the water stored behind the dam into mechanical energy via turbines, which then drive electrical generators. The strategic placement near the town of Kajiwa allows for relatively efficient transmission of the generated electricity to local and regional distribution networks.

The development of the Kajiwa Dam reflects the broader trend of harnessing the hydraulic resources of the Tibetan Plateau's eastern fringe. The Muli River, flowing through the diverse topography of the autonomous county, offers consistent flow rates suitable for sustained power production. The dam's construction involved significant engineering efforts to manage the rock-fill materials and ensure the integrity of the concrete face under varying environmental conditions. As an operational asset, the Kajiwa Dam plays a role in stabilizing the local power supply, complementing other energy sources in the province and supporting the economic development of Muli Tibetan Autonomous County.

Geography and Location

The Kajiwa Dam is situated in the mountainous terrain of southwestern China, specifically within the Muli Tibetan Autonomous County in Sichuan Province. The structure spans the Muli River, a tributary system that flows through the rugged landscape of the Hengduan Mountains. The precise geographic coordinates of the facility are 28.7114982, 100.8883095, placing it in a region characterized by significant topographic relief and high annual precipitation, factors that are critical for the hydrological efficiency of rock-fill dam constructions. This location near the settlement of Kajiwa provides strategic access for the transmission of electricity generated by the 452.4 MW capacity plant, which has been operational since its commissioning in 2015.

Regional Hydroelectric Context

Sichuan Province is one of the most significant hydroelectric power basins in China, largely due to the steep gradients of rivers originating from the Tibetan Plateau. The Muli River, as part of the larger Jinsha River watershed system, benefits from this natural head difference, allowing for efficient energy conversion. The development of the Kajiwa Dam reflects the broader regional strategy to harness the water resources of the Muli Tibetan Autonomous County to support both local consumption and the wider provincial grid. The concrete-face rock-fill design is particularly suited to this geological setting, where abundant local rock material reduces transportation costs and the flexible structure accommodates the seismic activity common to the Sichuan basin.

The operational status of the Kajiwa Dam as of 2015 marks a key phase in the modernization of Sichuan's energy infrastructure. While the specific operator is not detailed in the primary cited sources, the project's integration into the regional grid highlights the importance of decentralized hydroelectric units in stabilizing power supply in remote autonomous counties. The dam's location on the Muli River ensures a consistent water flow, which is essential for maintaining the 452.4 MW output capacity year-round, contributing to the energy security of the Muli Tibetan Autonomous County and surrounding areas in Sichuan Province.

Construction History

The construction of the Kajiwa Dam, a concrete-face rock-fill structure on the Muli River in Sichuan Province, China, spanned several key phases from preliminary works to full operational status. Preliminary construction activities began in 2008, establishing the foundational infrastructure required for the hydroelectric powerplant. This early stage involved site preparation and initial engineering assessments in the Muli Tibetan Autonomous County, near the settlement of Kajiwa.

Major construction of the power station itself commenced in August 2011. This phase marked the transition from preliminary groundwork to the intensive building of the dam structure and the integration of the 452.4 MW capacity facilities. The project progressed through the subsequent years, with significant milestones achieved in the final stages of development.

Reservoir impoundment began in December 2014, signaling the start of water accumulation behind the concrete-face rock-fill dam. This critical step preceded the final commissioning of the generating units. The first unit was officially commissioned on 16 March 2015, introducing the initial power output to the grid. The facility reached full operational status by the end of 2015, completing the construction timeline for this major energy infrastructure project in China.

Construction Timeline

Year	Event
2008	Preliminary construction began
2011	Power station construction started (August)
2014	Reservoir impoundment began (December)
2015	First unit commissioned (16 March); Fully operational by year-end

Technical Specifications

The Kajiwa Dam is engineered as a concrete-face rock-fill structure, a design choice that combines the flexibility of a rock-fill core with the watertight integrity of a reinforced concrete skin. This dam type is particularly effective in mountainous terrains, allowing for efficient water retention on the Muli River within the Muli Tibetan Autonomous County of Sichuan Province, China. The structural integrity of the concrete face is critical for managing the hydrostatic pressure exerted by the reservoir, while the rock-fill body provides the necessary mass and stability against the surrounding topography. The dam serves as the primary headworks for the Kajiwa hydroelectric powerplant, regulating the flow of water to drive the turbines located downstream.

Power Station Capacity and Configuration

The associated hydroelectric power station has a total installed capacity of 452.4 MW, making it a significant contributor to the regional energy grid in southwestern China. This capacity is derived from multiple turbine-generator units. Specifically, the first unit of the power station has a capacity of 110 MW, indicating a modular approach to the plant's construction and commissioning. The total capacity of 452.4 MW suggests the presence of additional units beyond the initial 110 MW installation, likely comprising three other units of similar or varying sizes to reach the aggregate output. The plant is currently operational, having been commissioned in 2015, which allows for a steady generation of renewable energy from the water resources of the Muli River.

Hydraulic Layout and Downstream Infrastructure

The hydraulic layout of the Kajiwa project involves directing water from the dam to a power station located approximately 6 km (3.7 mi) downstream. This distance is a key design parameter that influences the head available for power generation. The water is conveyed through penstocks or a tunnel system from the concrete-face rock-fill dam to the powerhouse. The 6 km stretch allows for a controlled descent of the water, optimizing the potential energy conversion into kinetic energy as it drives the turbines. The downstream location of the power station helps to minimize the footprint of the reservoir while maximizing the efficiency of the hydroelectric conversion process. This configuration is typical for run-of-the-river or small-reservoir hydroelectric schemes in the hilly regions of Sichuan Province.

How does the Kajiwa Dam generate power?

The Kajiwa Dam generates electricity through a run-of-the-river hydroelectric configuration that leverages the natural elevation drop of the Muli River in Sichuan Province. The facility operates by capturing water from the reservoir formed by the concrete-face rock-fill dam and channeling it through a system of penstocks to a power station located approximately 6 km downstream. This specific layout separates the water retention structure from the turbine hall, allowing engineers to optimize the hydraulic head—the vertical distance the water falls—to maximize energy extraction without requiring an excessively deep reservoir.

Hydraulic Mechanism and Downstream Configuration

Water released from the dam travels through large-diameter conduits to the downstream powerhouse. The 6 km distance between the dam crest and the turbines is a critical design parameter, as it determines the static head available to drive the generators. As the water descends, potential energy is converted into kinetic energy, striking the turbine blades and causing them to rotate. This mechanical rotation drives the generator’s rotor within a magnetic field, inducing an electrical current. The power station is situated in the valley floor near Kajiwa, which facilitates access for maintenance and grid connection while utilizing the natural topography to minimize the length of the headrace tunnels.

Role of the Concrete-Face Rock-Fill Design

The dam itself is constructed using a concrete-face rock-fill (CFR) design, a structural choice that significantly influences the operational reliability of the power generation system. In a CFR dam, a core of compacted rock fill provides the bulk mass required to resist the hydrostatic pressure of the Muli River. This core is capped with a sloping slab of reinforced concrete that acts as the primary water-tight barrier. This design is particularly effective in the mountainous terrain of the Muli Tibetan Autonomous County, where local rock materials are abundant, reducing transport costs and construction time.

The concrete face provides a smooth, durable surface that minimizes seepage losses, ensuring that a consistent volume of water reaches the downstream turbines. Unlike earth-fill dams, which may require extensive drainage systems to manage internal water flow, the CFR design offers a more rigid and predictable water retention capability. This structural integrity ensures that the water level in the reservoir remains stable, providing a steady flow rate to the power station. The operational status of the Kajiwa Dam as an active facility since its commissioning in 2015 demonstrates the effectiveness of this construction method in maintaining continuous power output. The total installed capacity of the plant is 452.4 MW, a figure achieved through the efficient conversion of the river’s flow and the elevation head provided by the CFR dam structure. The separation of the dam and the powerhouse allows for independent maintenance schedules, further enhancing the operational flexibility of the hydroelectric system.

Why it matters

The Kajiwa Dam represents a significant addition to the hydroelectric infrastructure of Sichuan Province, China. As a concrete-face rock-fill dam, it contributes to the region's growing capacity for renewable energy generation. The facility is located on the Muli River near Kajiwa in Muli Tibetan Autonomous County, Sichuan Province, China. Its operational status as of 2015 marks a key milestone in the development of the local energy grid. The dam's capacity of 452.4 MW provides a substantial power output, supporting both local consumption and regional transmission needs. This capacity is derived from the water flow of the Muli River, leveraging the natural topography of the area to generate electricity efficiently. The construction and commissioning of the Kajiwa Dam reflect broader trends in China's investment in hydroelectric power, particularly in western provinces like Sichuan, which are rich in water resources. The project underscores the strategic importance of integrating renewable energy sources into the national grid to meet increasing energy demands while reducing reliance on fossil fuels. The dam's role in the regional grid is crucial for stabilizing power supply and enhancing energy security in the Muli Tibetan Autonomous County and surrounding areas. It also contributes to the economic development of the region by providing a reliable source of electricity for local industries and communities. The Kajiwa Dam is part of the extensive list of dams and reservoirs in China, highlighting the country's leadership in hydroelectric infrastructure development. Its inclusion in this list signifies its importance in the national energy landscape. The dam's design as a concrete-face rock-fill structure is notable for its engineering efficiency and adaptability to the local geological conditions. This type of dam construction allows for effective water management and power generation while minimizing environmental impact. The Kajiwa Dam's operational success since 2015 demonstrates the effectiveness of this engineering approach in the Sichuan region. The facility's contribution to the Muli Tibetan Autonomous County's development is multifaceted, encompassing energy, economy, and infrastructure. By providing a steady supply of electricity, the dam supports local businesses and improves the quality of life for residents. The project also creates employment opportunities during and after construction, further boosting the local economy. The Kajiwa Dam's significance extends beyond its immediate surroundings, influencing the broader energy strategy of Sichuan Province. As one of the many hydroelectric facilities in the region, it plays a vital role in balancing the load on the regional grid and ensuring a consistent power supply. The dam's integration into the national energy framework highlights China's commitment to expanding its renewable energy portfolio. The Kajiwa Dam serves as a model for future hydroelectric projects in similar geographical and climatic conditions. Its success in generating 452.4 MW of power from the Muli River demonstrates the potential of leveraging natural water resources for sustainable energy production. The dam's location in Muli Tibetan Autonomous County also emphasizes the importance of regional development in China's energy sector. By investing in infrastructure in less developed areas, the project helps to bridge the energy gap between urban and rural regions. The Kajiwa Dam's operational status and capacity make it a key asset in Sichuan's hydroelectric infrastructure. Its contribution to the regional grid supports the province's goal of increasing the share of renewable energy in its power mix. The dam's design and construction reflect advanced engineering practices, ensuring long-term reliability and efficiency. The Kajiwa Dam's role in the development of Muli Tibetan Autonomous County is evident in its impact on local energy access and economic growth. The facility provides a foundation for further industrial and commercial expansion in the area. The dam's inclusion in the list of dams and reservoirs in China underscores its national significance. As a concrete-face rock-fill dam, it exemplifies the versatility and effectiveness of this dam type in diverse geographical settings. The Kajiwa Dam's operational history since 2015 provides valuable data for future hydroelectric projects in Sichuan and beyond. Its success in harnessing the Muli River's potential highlights the importance of strategic location selection in hydroelectric development. The dam's contribution to the regional grid enhances energy security and supports the province's economic objectives. The Kajiwa Dam stands as a testament to China's ongoing investment in renewable energy infrastructure. Its role in the Muli Tibetan Autonomous County's development is a key example of how energy projects can drive regional progress. The facility's capacity and operational status make it a vital component of Sichuan's hydroelectric network. The dam's engineering design ensures efficient power generation and water management. The Kajiwa Dam's significance in the context of Sichuan's hydroelectric infrastructure is clear. It supports the regional grid, aids in local development, and contributes to China's renewable energy goals. The dam's operational success since 2015 demonstrates the effectiveness of its design and location. The facility's capacity of 452.4 MW is a significant contribution to the regional power supply. The Kajiwa Dam's role in the Muli Tibetan Autonomous County's development is multifaceted, impacting energy, economy, and infrastructure. The project reflects China's commitment to expanding its hydroelectric infrastructure. Its contribution to the regional grid supports the province's renewable energy strategy. The dam's capacity and location make it a vital component of the regional grid. The facility's operational status since 2015 demonstrates its reliability and efficiency.

What distinguishes concrete-face rock-fill dams?

Concrete-face rock-fill dams represent a specific engineering approach to water retention, combining the flexibility of a rock-fill core with the impermeability of a concrete skin. The Kajiwa Dam utilizes this design, distinguishing it from traditional concrete gravity or arch dams that rely on massive monolithic structures for stability and watertightness. In a concrete-face rock-fill configuration, the primary structural mass consists of compacted rock fragments, which provide the bulk volume and weight necessary to resist hydrostatic pressure. This rock-fill core is typically less expensive to construct than solid concrete, particularly in regions where high-quality aggregate is abundant, such as the mountainous terrain of Sichuan Province where the Kajiwa Dam is located. The defining feature of this dam type is the concrete face slab that lines the upstream slope of the rock-fill body. Unlike earth-fill dams, which may use a central clay core or membrane for impermeability, the concrete face provides a rigid, durable barrier against water seepage. This face is supported by the rock-fill behind it, allowing the structure to accommodate minor settlements and deformations without cracking, provided the foundation is well-compacted. The flexibility of the rock-fill core can be advantageous in seismic zones, as it can absorb and distribute stress more effectively than a rigid concrete gravity dam. This design choice offers several operational and economic benefits. The construction process often involves placing and compacting rock-fill material while simultaneously pouring the concrete face, which can accelerate project timelines compared to the slow curing process of large concrete volumes. Additionally, the thermal mass of rock-fill is lower than that of solid concrete, reducing temperature-induced stresses during construction and early operation. For hydroelectric facilities like Kajiwa, this structural efficiency allows for a robust reservoir capacity with optimized material usage, supporting the plant's operational status and capacity generation in the Muli River basin. The concrete face also provides a relatively smooth surface for water flow, potentially reducing turbulence and erosion at the dam's crest during high-flow events.