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Longyangxia Dam
Longyangxia Dam
Longyangxia Dam
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Key Information

Longyangxia Dam Solar Park
Map
Commission date2014
Construction costCN¥6 billion[1]
Power generation
Nameplate capacity850 MW
[edit on Wikidata]

The Longyangxia Dam is a concrete arch-gravity dam at the entrance of the Longyangxia canyon on the Yellow River in Gonghe County, Qinghai Province, China. The dam is 178 metres (584 ft) tall and was built for the purposes of hydroelectric power generation, irrigation, ice control and flood control. The dam supports a 1,280 MW power station with 4 x 320 MW generators that can operate at a maximum capacity of 1400 MW. Controlling ice, the dam controls downstream releases to reservoirs lower in the river, allowing them to generate more power instead of mitigating ice. Water in the dam's 24.7×10^9 m3 (20.0×10^6 acre⋅ft) reservoir provides irrigation water for up to 1,000,000 hectares (2,471,054 acres) of land.[2]

The dam is composed of its main body and a gravity pier and secondary dam on both its left and right flank. The dam's service spillway contains two 12-metre-wide (39 ft) gates that discharge water into two 260-metre-long (850 ft) and 280-metre-long (920 ft) chutes. Downstream discharges are also controlled by a similar single-chute middle outlet and the lower outlet works.[2]

Photovoltaic power station

[edit]

In 2013 a solar photovoltaic station was built with a nameplate capacity of 320 MWp (Phase I), covering 9 square kilometres (3.5 sq mi).[3] An additional 530 MWp (Phase II) was completed in 2015,[4] covering further 14 square kilometres (5.4 sq mi),[5] making Longyangxia Dam Solar Park, with 850 MWp capacity, one of the largest photovoltaic power stations in the world.

The solar power station is integrated with the hydroelectric power station. The park is coupled to one of the hydroelectric turbines, which automatically regulates the output to balance the variable generation from solar before dispatching power to the grid. This limits the problems connected to variable solar generation while helping to conserve water.[4]

See also

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References

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Revisions and contributorsEdit on WikipediaRead on Wikipedia

Longyangxia Dam

View on Grokipedia
from Grokipedia
The Longyangxia Dam is a arch-gravity dam situated at the entrance of the Longyangxia Canyon on the in Gonghe County, Province, . Standing at a height of 178 meters and stretching 396 meters in length, it impounds a large with a total storage capacity of 24.7 billion cubic meters, making it a key component of the upper cascade system. Constructed primarily for hydroelectric power generation, the dam also supports flood control, , ice jam prevention, and through its multi-purpose design. Development of the Longyangxia Dam began in 1976 as the first major cascade project in the upper basin, with the main structure completed in 1992 after over 16 years of construction. The associated station features four 320 MW Francis turbine-generators, providing an installed capacity of 1,280 MW and enabling annual of approximately 5.94 TWh, which contributes significantly to China's Northwest Power Grid as a peaking and frequency-regulating facility. Known as the "First Dam of the ," it plays a vital role in regulating flow, mitigating downstream flooding during the rainy season, and controlling ice hazards in winter, thereby enhancing regional and ecological stability. In recent years, the Longyangxia site has gained prominence for its integration of technologies, particularly through the adjacent Longyangxia Dam Solar Park, which was the world's largest photovoltaic installation at 850 MW capacity as of 2017 and exemplifies China's hybrid solar-hydro approach to optimizing energy output and grid stability. This combination allows for complementary operations, where supplements during peak daylight hours and the reservoir provides storage for excess , supporting China's goals for and carbon reduction. The project's success highlights advancements in multi-objective dam engineering, balancing power production with in a seismically active and ecologically sensitive high-altitude region.

Location and Background

Geography and Hydrology

The Longyangxia Dam is situated in Gonghe County, Tibetan Autonomous Prefecture, Province, , at the entrance to the Longyangxia Canyon on the , spanning the border with Guinan County, at coordinates 36°07′23″N 100°55′10″E. This positioning places the dam approximately 1,648 km downstream from the 's source. The regional geography is characterized by the northeastern margin of the , an arid environment in northwest with high exceeding 5,500 MJ/m² annually and pronounced seasonal variations in . River flows in this upper reach are highly variable, driven by rains from June to September and from upstream glaciers and snowfields on the plateau, resulting in peak discharges during summer floods and low flows in winter. Hydrologically, the dam regulates a of 131,400 km², representing about 18% of the total basin of 752,443 km². The average annual inflow to the is 18.5 billion cubic meters, with a discharge of 623 m³/s, though interannual variability is significant due to climatic fluctuations. The upper 's hydrology is marked by its flood-prone , with historical peak flows exceeding 10,000 m³/s, and a substantial load averaging over 1.6 billion tons annually basin-wide, necessitating for flood control and . Site selection for the dam emphasized the canyon's natural narrowing to approximately 30 meters at its mouth over a 33 km length, which enhances structural stability by confining the and reducing foundation requirements. This geological feature, combined with the site's alignment along major transmission corridors, supports efficient energy export from the resource-rich northwest to demand centers in eastern .

Construction History

The Longyangxia Dam was planned in the as part of China's comprehensive cascade development scheme for the upper , aimed at enhancing flood control, , and hydroelectric power generation in the region. This initiative positioned the project as the first large-scale station in the planned upper cascade, receiving state approval to address longstanding challenges in water resource management and energy supply. Construction officially commenced in January 1976 under directives from the national , marking a significant step in the country's post-Cultural Revolution infrastructure push. The construction unfolded in several major phases, beginning with foundational groundwork and river diversion efforts in the late 1970s, including the start of damming operations in 1979. Throughout the , the focus shifted to pouring the main body, with the structure reaching completion in 1986. impoundment began in October 1986, enabling initial ahead of power generation. Key milestones included the operational start of the first generating unit in September 1987, followed by the second unit in December 1987, and all four units by June 1989, allowing partial power output during ongoing works. The project achieved full completion and official commissioning of the hydroelectric station in 1992, after which it integrated into the national grid as a state-funded endeavor. Engineering challenges were prominent due to the site's high elevation exceeding 2,500 meters in the remote Longyangxia canyon of Qinghai Province, which complicated worker and equipment performance. The region’s seismic activity necessitated rigorous safety evaluations and reinforced design for the arch-gravity structure to mitigate earthquake-induced risks. Logistical hurdles arose from the isolated location, including transporting massive volumes of and materials over rugged amid Qinghai's severe winters, which often halted progress and demanded innovative scheduling to maintain momentum.

Design and Specifications

Dam Structure

The Longyangxia Dam is a concrete arch-gravity structure engineered for enhanced stability within the narrow confines of the Longyangxia canyon on the upper Yellow River. This hybrid design combines the compressive strength of an arch to transfer horizontal loads to the valley walls with the weight of a gravity dam to resist overturning forces, making it suitable for the site's geological conditions. The dam stands at a maximum height of 178 from its foundation, with a crest length of 396 along the top arch. Its crest width measures 15 , tapering to a base width of 80 to optimize mass distribution and foundation contact. The structure utilizes , selected for its ability to withstand the high hydrostatic pressures and the region's seismic risks, with the arch featuring a maximum of 85 degrees, 2 minutes, and 39 seconds to efficiently distribute water loads across the abutments. Key structural elements include gravity buttressing at the ends to supplement the arch action and prevent abutment sliding. The spillway is integrated into the dam crest with a gate-controlled design capable of handling flood discharges, supported by the overall configuration that ties into the site's hydrology for controlled water release. Auxiliary components encompass intake towers embedded in the dam body to channel water to downstream turbines, ensuring reliable flow diversion without compromising the barrier's integrity. Seismic reinforcements, informed by regional tectonic assessments, incorporate reinforced concrete placements and foundation grouting to mitigate earthquake-induced vibrations, as validated through dynamic response studies.

Reservoir Characteristics

The Longyangxia Reservoir, impounded by the Longyangxia Dam on the upper Yellow River, serves as a key multi-year regulating water body with a total storage capacity of 24.7 billion cubic meters and a surface area of 367 square kilometers at normal pool level. The reservoir's normal pool elevation stands at 2600 meters above sea level, while the dead water level is 2530 meters and the flood limit water level is 2594 meters, allowing for allocations that include approximately 19.35 billion cubic meters of effective storage for multi-year regulation and flood control purposes. With a maximum depth of 137 meters and an average depth of 65 meters, the reservoir experiences significant volume fluctuations tied to seasonal operations, where water levels typically rise from July to November and decline from November to April of the following year. Impoundment of the reservoir commenced in October 1986, marking the onset of its role in stabilizing the river's flow regime. In terms of water management, the reservoir supports irrigation for up to 1 million hectares of downstream farmland by providing regulated releases that enhance agricultural productivity in the arid upper Yellow River basin. Additionally, it functions as a sediment trap, capturing substantial amounts of upstream silt—estimated at 0.277 gigatons by 2000—to mitigate siltation and erosion in the lower Yellow River reaches. For ice control, the reservoir employs strategic water releases during winter to prevent ice jams and associated flooding in downstream areas. The reservoir's operational parameters are influenced by its location in a plateau arid-semiarid , where annual rates range from 1327 to 1379 millimeters, contributing to a challenging . The average annual inflow is 622.81 cubic meters per second, equivalent to roughly 19.65 billion cubic meters, which the regulates to balance outflows, losses, and storage needs across wet and dry periods. This regulation draws from a comprising about 18% of the total basin upstream.

Power Generation Facilities

Hydroelectric Power Station

The hydroelectric at the Longyangxia Dam is equipped with four Francis turbines, each rated at 320 MW, providing a total installed capacity of 1,280 MW. This configuration supports peak regulation in the Northwest Power Network, where the station serves as the largest such source in the Basin. The facility operates with a net derived from the reservoir's elevation difference, facilitating an annual energy output of approximately 5.95 TWh under designed conditions. flow through the turbines is managed to align with seasonal , flexible operation for peak load demands during high-inflow periods like summer floods, while conserving storage for dry seasons. Efficiency assessments using indicate that operational performance can vary, with relative hydropower utilization rates often below optimal levels due to factors such as runoff forecasting inaccuracies and water allocation constraints. Upstream, penstocks deliver water from the intake to the turbines, with the overall setup including transformers and a switchyard for stepping up voltage to 330 kV for transmission integration into the regional grid. This infrastructure enables the station to contribute reliably to base-load in northwest , mitigating variability in regional .

Photovoltaic Power Station

The Longyangxia Dam , commissioned in 2014, represents a major initiative in China's expansion. Phase I, completed in 2013, features a capacity of 320 MWp across 9 km², while Phase II, finished in 2015, adds 530 MWp over an additional 14 km², resulting in a total installed capacity of 850 MWp. The project, developed by the and partners, spans approximately 23 km² adjacent to the dam in Gonghe County, Province, and was constructed at a total cost of CN¥6 billion. This ground-mounted solar array incorporates nearly 4 million photovoltaic panels, primarily utilizing deep blue cells, a high-efficiency variant of technology designed for optimal performance in high-altitude environments. The station employs advanced components to maximize energy capture, including inverters for to conversion and single-axis tracking systems that adjust panel orientation to follow the sun's path, thereby improving overall efficiency by up to 25% compared to fixed-tilt installations. Situated on the , the site benefits from Qinghai's clear skies and abundant solar resources, with annual global horizontal irradiance exceeding 1,800 kWh/m², enabling high yield in a region characterized by over 3,000 hours of sunshine per year. These environmental advantages, combined with the panels' durability against harsh weather, support reliable generation. The PV plant is connected to the hydroelectric station via a 330 kV , facilitating grid-level integration. In , upon full operation of Phase II, the Longyangxia facility achieved the milestone of becoming the world's largest plant at the time, surpassing previous records and underscoring China's leadership in utility-scale . No significant expansions or major technological upgrades have been reported through , maintaining the 850 MWp capacity as a benchmark for hybrid renewable sites, though ongoing maintenance incorporates efficiency enhancements like improved dust mitigation for panel cleaning in the arid locale.

Operations and Integration

Hybrid Energy System

The Longyangxia Dam's hybrid energy system integrates a 1,280 MW hydroelectric with an 850 MW photovoltaic (PV) plant, forming the world's first large-scale hydro-PV hybrid facility connected via a dedicated 330 kV . This configuration leverages the complementary nature of the two resources, where PV generation peaks during midday hours due to high in the arid region, while the hydroelectric component provides flexible dispatch to meet evening and periods. The co-location allows for shared infrastructure, including grid connections through the hydro station's outlet channels, treating the combined output as a "virtual unit" for optimized energy production. Technical synergies arise from the rapid regulation capabilities of the hydro turbines, which compensate for PV output fluctuations caused by or diurnal variations, effectively acting as an additional "fifth " to smooth . The PV array serves as a supplementary "virtual reservoir" by generating excess daytime power that can be balanced by hydro storage, while the hydroelectric system provides reliable during low-sunlight periods, reducing overall dependency in the water-scarce environment. This interplay enhances system efficiency, with the hydro component's quick-response turbines enabling real-time adjustments to PV variability. Operational strategies employ a hydro-PV control system that implements dispatch rules prioritizing the renewable mix, such as intraday compensation modes where hydro output is adjusted based on real-time PV forecasts and grid demands. Fixed scheduling curves or total output optimization algorithms ensure balanced , with hydro ramping up or down to maintain stable power delivery; for instance, the system can achieve PV capacity factors around 20% complemented by hydro's higher utilization of approximately 53% annually. Advanced control mechanisms, including predictive modeling, further refine these operations to align with teleconnection factors like weather patterns. The hybrid approach yields significant benefits, including improved grid stability through reduced PV curtailment—enabling higher consumption—and minimized need for spinning reserves by leveraging hydro's dispatchability. This synergy not only boosts the overall of the hydroelectric plant but also enhances transmission efficiency, making the system more economically viable and resilient in integrating variable renewables into the northwest grid.

Grid Integration and Output

The Longyangxia Dam's hybrid power generation facilities are integrated into China's Northwest Power Grid through a dedicated 330 kV transmission line connecting the solar PV arrays directly to one of the hydroelectric plant's turbine units, enabling seamless on-site synchronization before broader export. This setup allows the combined output to feed into the national grid system, with electricity transmitted over long distances via ultra-high-voltage (UHV) direct current lines, such as the ±800 kV lines spanning from Qinghai Province to central and eastern load centers including Beijing and Shanghai. These UHV interconnections, part of China's west-to-east power transfer strategy, facilitate the delivery of clean energy from remote western resources to high-demand urban areas, enhancing grid stability through coordinated dispatch. The facility's total annual generation reaches approximately 7.4 TWh, dominated by the hydroelectric component at about 5.9 TWh, while the solar PV station contributes roughly 1.5 TWh, reflecting hydro's higher of around 53% due to reservoir storage compared to solar's variable output peaking during daylight hours. This combined production supports peak load management, with the hybrid system's complementarity—where hydro compensates for solar —achieving effective capacity factors exceeding those of standalone renewables. As of 2025, output remains stable, with no reported major declines, aligning with ongoing operations amid China's expanding clean energy infrastructure. Performance metrics highlight the plant's reliability, with historical operational data showing minimal downtime and robust integration that has reduced curtailment rates through predictive scheduling, contributing significantly to national renewable targets under the 13th Five-Year Plan (2016–2020) by bolstering non-fossil fuel capacity and the 14th Five-Year Plan (2021–2025) goal of 33% . The system has maintained high availability, often above 95% for hydro units, aiding China's broader push for carbon neutrality by 2060 via efficient renewable dispatch. Key challenges include transmission losses from the remote location to eastern centers, typically 3–5% along UHV lines due to the over 1,500 km distances, compounded by historical grid bottlenecks that have led to up to 11% curtailment of solar output in earlier years before upgrades. Integration with expanding UHV networks has mitigated these issues, improving overall and reducing variability impacts on .

Impacts and Significance

Environmental Effects

The Longyangxia Dam provides several positive environmental effects through its flood mitigation capabilities, which reduce downstream and in the basin by regulating peak flows to 4000–6000 m³/s during flood seasons. This regulation stabilizes riverbanks and supports more consistent hydrological conditions for riparian ecosystems, while also enabling that promotes in arid upstream regions. Additionally, the dam's hydroelectric and integrated photovoltaic facilities displace fossil fuel-based power generation; the cascade reservoirs including Longyangxia contribute an estimated annual CO₂ emission reduction of approximately 15.8 million tons by substituting coal-fired . However, the reservoir's creation has led to significant negative ecological impacts, including the submersion of approximately 383 km² of land, which flooded diverse habitats and displaced local flora and fauna in the upper valley. The reservoir inundation also displaced approximately 48,000 local residents, primarily Tibetan and Han farmers and herders, leading to resettlement challenges such as loss of traditional livelihoods, restricted access to resources, and socio-economic difficulties in new locations. This has disrupted patterns, with dams like Longyangxia blocking endemic and migratory such as Gymnodiptychus pachycheilus and Coreius septentrionalis, contributing to a 35.4% decline in overall Yellow River fish from 1965 to 2015 and favoring like Cyprinus carpio. and altered flow regimes have further reduced active channel width by 40% in affected reaches, limiting geodiversity and accelerating woody vegetation encroachment on floodplains. Reservoir-induced and landslides pose additional risks, with water level fluctuations triggering deformations in 12 identified slopes and frequent earthquakes exacerbating slope instability and downstream flood hazards. from the reservoir, a potent , are also elevated due to organic matter decomposition in the impounded waters, though specific fluxes vary seasonally. The integrated adds solar-specific environmental considerations, occupying 65.3 km² of PV arrays across 84.6 km² of natural , which alters local communities and potentially disrupts arid ecosystems through habitat conversion. While the panels create a cooling effect—reducing land surface temperatures by up to 2.3 °C within 730 m of the boundary, potentially benefiting surrounding —their deployment raises concerns about bird hazards from collisions, though site-specific mortality data remains limited. Mitigation efforts include extensive , with over 1.62 billion fry released into the reservoir since 2009 to restore and support migratory , alongside ongoing hydrological and seismic monitoring to manage risks and . These measures aim to balance the dam's operations with preservation, though long-term is essential given ongoing influences.

Economic and Strategic Role

The Longyangxia Dam has significantly contributed to economic growth in Qinghai Province through job creation and sustained revenue generation from its hybrid power operations. During the of the dam in the late 1970s and the subsequent expansion of the solar park starting in , the project supported thousands of jobs in engineering, manufacturing, and maintenance, aligning with China's national initiatives that aimed to create over 13 million positions in solar and sectors by 2020. Ongoing employment in plant operations and grid integration further bolsters local economies by providing stable work in a region historically reliant on resource extraction. Revenue from electricity sales to the state grid, enhanced by the hybrid system's improved capacity utilization, has generated consistent income, with the facility's integration of solar PV acting as an additional "turbine" to optimize output and economic returns. Strategically, the dam forms a critical component of the hydropower cascade, enabling coordinated management of for power generation, flood control, and regional energy supply across upstream reservoirs like Liujiaxia. This positioning strengthens China's by diversifying supply sources and reducing dependence on , particularly as the hybrid model complements variable solar output with reliable hydropower. The facility advances national objectives for peaking carbon emissions by 2030 through scalable hybrid renewables, contributing to the goal of 20% non-fossil fuel while demonstrating efficient grid stability in remote areas. Funded through national development plans, including the allocation of approximately $360 billion for renewables through 2020, the Longyangxia project exemplifies policy-driven investment in clean energy infrastructure. It plays a central role in Qinghai's designation as a national clean energy demonstration province since 2018, supporting the province's "new energy base" strategy to build multi-gigawatt capacities by 2025—as achieved with over 75 GW of installed power capacity, 95% from clean sources as of July 2025—and export power to eastern provinces via interconnections like the Qinghai-Henan line. As of 2025, ongoing optimizations in hybrid operations continue to align with the 14th Five-Year Plan's emphasis on and transmission enhancements. On a broader scale, the Longyangxia Dam symbolizes 's transformative shift toward green energy, mirroring the scale of mega-projects like the but emphasizing sustainable hybrid technologies over traditional alone. This model has positioned as a global exporter of low-carbon expertise, influencing renewable deployments in , , and through and investment.

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