Overview

The Houziyan Dam is a major hydroelectric embankment structure located on the Dadu River in Danba County, Sichuan province, China. As a key component of the regional energy infrastructure, the facility operates as a run-of-the-river or reservoir-based hydroelectric power plant, harnessing the hydraulic head of the Dadu River to generate electricity for the national grid. The dam is classified as an embankment dam, a design choice that utilizes earth or rock-fill materials to create the barrier across the river valley, providing both water storage capacity and structural stability for the powerhouse.

Technical Specifications and Capacity

The Houziyan Dam features a significant structural height of 223.5 meters, which allows for a substantial hydraulic head to drive the turbine generators. The associated reservoir has a total storage capacity of 662 million cubic meters, enabling effective water management for power generation and downstream flow regulation. This reservoir volume supports the plant's operational flexibility, allowing for both base-load and peak-load energy production depending on seasonal water inflows and grid demand.

The power plant has a total installed electrical capacity of 1700 MW. This capacity is derived from four individual generator units, each rated at 425 MW. The configuration of four 425 MW generators provides a modular approach to power output, allowing for maintenance on individual units without completely shutting down the entire facility. The total output of 1700 MW makes the Houziyan Dam a significant contributor to the Sichuan province's hydroelectric portfolio, leveraging the steep gradient of the Dadu River basin.

The facility became operational in 2016, marking the completion of a major engineering project in the southwestern region of China. Since its commissioning, the Houziyan Dam has remained in active service, contributing to the stability of the regional power grid. The integration of this large-capacity hydroelectric plant into the Dadu River cascade helps optimize the overall efficiency of the river's hydroelectric potential, working in conjunction with other dams in the system to maximize energy yield from the water resource.

History

The development of the Houziyan Dam on the Dadu River in Danba County, Sichuan province, China, followed a structured timeline beginning in the mid-2000s. The project's formal inception is marked by the completion of the feasibility report in May 2006, which laid the technical and economic groundwork for the hydroelectric embankment dam. Shortly thereafter, in July 2006, the application for the project was granted, securing the necessary administrative approvals to proceed with construction planning.

Construction Timeline and Delays

Initial projections anticipated a swift commencement of physical works. The planned start date for the construction was set for 2007, suggesting a rapid transition from paper planning to ground-breaking activities. However, the actual groundbreaking did not occur until 2011, indicating a four-year delay between the initial schedule and the physical start of the project. This gap may reflect typical pre-construction phases such as land acquisition, detailed engineering design, or environmental assessments common to large-scale infrastructure in the region, though the specific causes for the delay are detailed in the project's administrative records.

Year Event
2006 (May) Feasibility report completed
2006 (July) Application granted
2007 Planned start of construction
2011 Actual groundbreaking
2016 Commissioning of the dam

The construction phase, spanning from 2011 to 2016, involved the erection of the embankment structure and the installation of the hydroelectric generation units. The project culminated in the commissioning of the plant in 2016, bringing the facility into operational status. The Houziyan Dam, with an installed capacity of 1700 MW, became a significant contributor to the regional power grid upon its completion. The timeline from the initial feasibility study to final commissioning covers a decade, reflecting the complex nature of hydroelectric development in the Dadu River basin. The operational status as of the commissioning year indicates that the dam has been generating power since 2016, serving the energy needs of Sichuan province and beyond.

Technical Specifications

The facility is currently operational and contributes to the regional energy infrastructure with a total installed capacity of 1700 MW. The power generation system is configured with four individual generators, each rated at 425 MW, which collectively deliver the plant's total output. This configuration allows for flexible power delivery and maintenance scheduling across the generating units.

The dam structure itself is characterized as an embankment dam, a design choice suited to the specific geological and hydrological conditions of the Dadu River basin. The structure reaches a height of 223.5 m, creating a significant head for hydroelectric power generation. The reservoir formed by the dam has a total volume of 662 million m3, providing storage capacity that supports both power generation and water management in the region. The reservoir's volume and the dam's height are critical parameters that influence the plant's operational efficiency and flood control capabilities.

Technical Parameters

Parameter Value
Dam Type Embankment dam
Location Dadu River, Danba County, Sichuan province, China
Dam Height 223.5 m
Reservoir Volume 662 million m3
Total Installed Capacity 1700 MW
Number of Generators 4
Capacity per Generator 425 MW
Commissioning Year 2016
Operational Status Operational

The technical specifications reflect a modern hydroelectric facility designed for significant power output. The combination of the embankment dam design and the specific generator configuration represents a standard approach for large-scale hydroelectric projects in the Sichuan region. The plant's operational status since its commissioning in 2016 indicates a stable integration into the local power grid, providing consistent energy generation from the water resources of the Dadu River.

Why it matters

The Houziyan Dam represents a critical node in the strategic development of China’s hydropower infrastructure, specifically within the Dadu River basin in Sichuan province. As a hydroelectric embankment dam with an installed capacity of 1700 MW, commissioned in 2016, it serves as a significant contributor to the regional energy mix in southwestern China. Its location in Danba County places it at the heart of one of the most intensive hydroelectric cascade developments in the country, where the Dadu River’s steep gradient and consistent flow are harnessed to generate substantial baseload power for the Sichuan grid.

Role in the Dadu River Cascade

The Dadu River is renowned for its potential for hydropower generation, often described as a key artery for China’s renewable energy expansion. The Houziyan Dam is not an isolated structure but an integral component of a larger cascade system. This cascading approach allows for the sequential capture of potential energy as water descends from the Tibetan Plateau towards the Yangtze River. By contributing 1700 MW to this system, Houziyan helps stabilize power output across the cascade, complementing neighboring dams to ensure a more consistent supply to the regional transmission network. The operational status of the dam since 2016 indicates its maturity within the system, providing reliable generation capacity that supports both local industrial demand and broader provincial export needs.

Impact on Danba County and Regional Infrastructure

For Danba County, the Houziyan Dam is a major infrastructure landmark that underscores the region’s economic reliance on energy production. The construction and subsequent operation of such a large-scale embankment dam involve significant engineering feats, adapting to the complex topography of the Sichuan basin. The dam’s presence influences local hydrology and serves as a focal point for infrastructure development in the county. As part of China’s broader push to expand hydropower capacity, Houziyan exemplifies the scale of investment required to unlock the energy potential of the Dadu River. Its 1700 MW output is a tangible metric of this investment, reflecting the strategic importance of the Dadu River system in meeting national energy targets. The dam’s operation continues to be a key factor in the energy profile of Sichuan province, highlighting the enduring significance of large-scale hydroelectric projects in China’s energy landscape.

What are the key features of the Houziyan Dam?

The Houziyan Dam represents a significant engineering achievement in the upper reaches of the Dadu River within Danba County, Sichuan province, China. As an operational hydroelectric power plant, its defining characteristic is its classification as an embankment dam, a structural choice that distinguishes it from the concrete gravity or arch dams more commonly associated with high-head hydroelectric projects in the region. This embankment design allows for a robust containment structure capable of managing the substantial hydraulic head required for efficient power generation in the mountainous terrain of the Dadu River basin.

Structural Scale and Reservoir Characteristics

The physical scale of the Houziyan Dam is marked by its height of 223.5 m. This elevation is a critical parameter that determines the potential energy available for conversion into electricity. The dam creates a reservoir that captures the flow of the Dadu River, regulating water volume to ensure consistent power output. The embankment structure must withstand significant lateral pressure from the stored water, requiring careful geotechnical analysis of the foundation and the surrounding rock formations in Danba County. The reservoir's capacity and the dam's height work in tandem to optimize the hydraulic gradient, which is essential for the efficiency of the downstream turbine units.

Power Generation Configuration

The hydroelectric power station associated with the Houziyan Dam has a total installed capacity of 1700 MW. This capacity is achieved through a specific generator setup consisting of four individual units, each rated at 425 MW. This 4 x 425 MW configuration provides operational flexibility, allowing for partial load operation depending on seasonal water availability and grid demand. The commissioning of the plant in 2016 marked the integration of these four large-scale generators into the regional power grid, contributing significantly to the energy output of Sichuan province. The choice of 425 MW per unit reflects modern trends in hydroelectric turbine sizing, balancing mechanical complexity with output efficiency. The operational status of the dam remains active, with the four generators continuing to convert the kinetic energy of the Dadu River into electrical power for regional consumption.

How was the construction timeline managed?

The development of the Houziyan Dam was characterized by a distinct separation between initial feasibility assessments and the formal commencement of construction. The project's timeline began with critical preparatory phases in 2006, a year marked by the initiation of feasibility studies and the formal application processes required to advance the hydroelectric project (per project documentation). These early stages were essential for evaluating the hydrological potential of the Dadu River in Danba County, Sichuan province, and securing the necessary administrative approvals to proceed with the embankment dam structure.

Gap Between Planning and Groundbreaking

Despite the 2006 feasibility groundwork, the project did not reach the formal groundbreaking stage until 2011. This five-year interval between the planned start in 2007 and the actual commencement of construction highlights the complex logistical and administrative hurdles often associated with major infrastructure projects in the Sichuan region. The gap between the initial 2007 timeline and the 2011 reality suggests that factors such as environmental assessments, land acquisition in Danba County, or the integration of the project into the broader regional grid infrastructure may have influenced the schedule. The delay underscores the difference between theoretical project initiation and the physical mobilization of resources required for a dam with a capacity of 1700 MW.

Completion and Operational Status

The construction efforts that began in 2011 culminated in the commissioning of the Houziyan Dam in 2016. This five-year construction period resulted in the establishment of a significant hydroelectric powerplant on the Dadu River. The facility is currently listed as operational, contributing to the energy infrastructure of China. The 2016 completion date marks the transition from a planned and under-construction asset to a functional energy source, realizing the capacity goals outlined during the initial feasibility and application phases of the mid-2000s. The timeline from the 2006 feasibility studies to the 2016 commissioning represents a decade-long effort to bring this specific hydroelectric resource online.

Where is the Houziyan Dam located?

The Houziyan Dam is situated in Danba County, within Sichuan province in southwestern China. The facility is an integral part of the hydroelectric infrastructure developed along the Dadu River, a major tributary of the Min River and a key component of the Yangtze River basin’s energy potential. The dam’s precise location is defined by the coordinates 30.5560387° N, 102.0523989° E, placing it in a region characterized by significant topographical variation and dense river networks that have historically supported both agricultural activity and modern energy generation projects.

Regional Setting and Hydrological Context

Danba County, where the Houziyan Dam is located, is known for its rugged terrain and strategic position within the Sichuan Basin’s western fringe. The Dadu River, which flows through this area, has long been recognized for its substantial flow volume and elevation drop, making it one of the most productive corridors for hydropower development in China. The river originates in the Qinghai-Tibet Plateau and traverses through mountainous landscapes before joining the Min River, contributing significantly to the regional water resources and energy output.

The selection of the Houziyan site reflects the broader strategy of leveraging natural geographical advantages to maximize energy efficiency. The embankment dam design is particularly suited to the local geology and hydrological conditions, allowing for effective water storage and controlled release to drive the 1700 MW installed capacity. This location also benefits from the relatively stable tectonic environment compared to other parts of the Sichuan region, which has undergone extensive seismic monitoring and engineering adaptations for large-scale infrastructure projects.

Geographical Significance

The dam’s position in Danba County places it within a culturally and ecologically diverse area. The surrounding landscape includes forested hills, river valleys, and agricultural zones that have adapted to the seasonal variations in water flow. The Dadu River’s course through this region has historically influenced settlement patterns and economic activities, with the introduction of the Houziyan Dam adding a modern layer of utility to the traditional hydrological dynamics.

From an infrastructural perspective, the dam’s location facilitates connectivity between upstream and downstream communities, enhancing both energy distribution and water management capabilities. The coordinates 30.5560387° N, 102.0523989° E serve as a critical reference point for logistical planning, environmental assessments, and ongoing operational monitoring of the facility. This strategic placement underscores the importance of integrating natural geography with engineered solutions to meet the growing energy demands of Sichuan province and the broader Yangtze River economic zone.

The Houziyan Dam’s location in Danba County, Sichuan province, China, on the Dadu River, exemplifies the synergy between natural resources and technological advancement in modern hydroelectric power generation. The region’s unique geographical features provide an ideal setting for the dam’s operation, ensuring sustained energy production while maintaining ecological and cultural balance in the surrounding area.

See also