3 Gorges Dam

3 Gorges Dam
Source file: Le Grand Portage Derivative work: Rehman · CC BY 2.0 · source
Name	Three Gorges Hydropower Project
Location	Yichang, Hubei, China
Coordinates	30°49′N 111°0′E
Status	Operational
Construction	1994–2012
Cost	US$24–39 billion
Owner	China Three Gorges Corporation
Dam type	Concrete gravity/embankment
Height	185 m
Length	2,335 m
Reservoir	Three Gorges Reservoir
Capacity	22,500 MW installed
Turbines	32 × 700 MW, 2 × 50 MW, 2 × 25 MW

3 Gorges Dam

The Three Gorges hydropower project is a large-scale hydroelectric complex on the Yangtze River near Yichang, Hubei. It was conceived during the Republic of China period, revived under the People's Republic of China leadership, and executed by state agencies to provide hydropower, flood control, and improved navigation along the middle Yangtze. The project became a focal point for debates involving Deng Xiaoping-era development policy, international engineering firms, and domestic resettlement programs.

Background and construction

Plans for harnessing the Yangtze River date to the early 20th century with proposals from engineers associated with the Republic of China and later governors; major modern advocacy emerged after the 1949 founding of the People's Republic of China, gaining momentum during the Third Front campaign and post-Cultural Revolution modernization. Feasibility studies involved international firms and Chinese ministries including the Ministry of Water Resources and Electric Power, while political approval was debated in sessions of the National People's Congress and under leaders like Jiang Zemin and Li Peng. Construction began in 1994, with cofferdams, diversion tunnels, and stagewise river impoundment leading to full completion of the main works and commissioning of the final generating units by 2012. Major contractors included state-owned enterprises linked to China Railway Engineering Corporation, China Gezhouba Group Corporation, and suppliers from the General Electric Company and other international manufacturers.

Design and engineering

The complex comprises a concrete gravity dam and auxiliary embankment structures spanning the Yangtze River gorge between Sandouping and Badi. Design features include large spillways, ship locks, underground powerhouses, and penstocks feeding Francis turbine units supplied by consortia of domestic and foreign manufacturers. Structural analysis drew on precedents from the Itaipu Dam, Hoover Dam, and Soviet-era projects, with seismic assessments referencing data from the Wenchuan earthquake research and regional fault mapping. Engineering systems integrate navigation locks, a ship lift study, and auxiliary power installations to manage head and flow variations predicted by hydrologists from institutions like the Chinese Academy of Sciences and international consultancies.

Power generation and operations

Installed capacity reaches approximately 22,500 MW through multiple high-capacity units organized across surface and underground caverns, with grid connection to the national transmission network overseen by China State Grid Corporation. Operations coordinate seasonal river flows, maintenance outages, and peaking strategies to supply metropolitan loads in Shanghai, Chongqing, Wuhan, and Guangzhou. Generation metrics and dispatch decisions involve collaboration between the operator China Three Gorges Corporation, regional dispatch centers, and planners influenced by energy policy frameworks from the National Development and Reform Commission. Turbine governors, excitation systems, and reservoir regulation employ control technologies developed with inputs from engineering firms like Harbin Electric Company and international partners.

Flood control, navigation, and water management

Flood mitigation along the middle and lower Yangtze River has been a primary justification, linked historically to catastrophic floods such as the 1931 China floods and later events examined in studies by the Ministry of Water Resources. The reservoir provides storage capacity to attenuate peak flows, while downstream navigation improvements include a five-step ship lock staircase and planned ship lift designs facilitating passage for large commercial vessels serving ports such as Wuhan Port and riverine logistics nodes. Reservoir operations interact with upstream tributary regulation, irrigation demands in the Dongting Lake and Poyang Lake basins, and coordination with provincial authorities including Sichuan and Jiangxi water bureaus.

Environmental and ecological impacts

Creation of the reservoir flooded large tracts of river valley, altering habitats for species such as the Chinese sturgeon, the Yangtze finless porpoise, and migratory fish populations studied by the Chinese Academy of Fishery Sciences and conservation NGOs. Sediment trapping has modified downstream geomorphology and delta processes affecting the Yangtze River Delta and infrastructures in Shanghai. Altered flow regimes and water temperature stratification influenced algal bloom dynamics, invasive species patterns, and wetlands in protected areas like the Three Gorges Reserve. Mitigation efforts have included fish passages studies, artificial breeding programs linked to the Chinese Academy of Sciences, and international collaborations with researchers from institutions such as WWF and various universities.

Social and economic effects

The project generated large-scale hydroelectric output that contributed to industrial growth in economic centers like Chongqing and export manufacturing regions feeding ports such as Ningbo. It required relocation and resettlement of over a million residents from inundated areas, coordinated by municipal and provincial bureaus and involving compensation programs, new town construction, and social services provided by agencies in Hubei, Hunan, and Sichuan. Economic assessments reference impacts on inland shipping, tourism development at scenic sites including sections near Zigui County, and heritage considerations tied to cultural relics recorded by the State Administration of Cultural Heritage.

Controversies and criticisms

Criticism has focused on environmental degradation, displacement and human rights concerns raised by civil society groups and scholars from institutions including international universities, debates over seismic risk referencing regional fault studies, and cost-benefit analyses by economists linked to the World Bank and academic journals. Allegations included inadequate consultation with affected communities, challenges in cultural heritage preservation, and uncertainties about long-term sedimentation and water quality trends. Legal and policy debates invoked instruments debated in the National People's Congress and discussions at forums such as the United Nations environmental conferences, while defenders cited successful flood reductions in certain years and substantial renewable electricity generation credited to state planners and energy authorities.

Category:Hydroelectric power stations in China Category:Yangtze River Category:Dams in China