Name: Liyang Pumped Storage Power Station
Address: CN

Overview

The Liyang Pumped Storage Power Station is a significant pumped-storage hydroelectric facility located in Jiangsu Province, eastern China. Situated approximately 22 km (14 mi) south of the city of Liyang, the station serves as a key infrastructure asset for regional energy management. With a total installed capacity of 1,500 MW, the power station operates by utilizing water as its primary energy source, storing potential energy in upper and lower reservoirs to balance supply and demand on the electrical grid. The facility is currently operational, having commissioned its first unit in 2017, marking a milestone in the development of Jiangsu’s renewable and flexible power generation mix.

Construction of the Liyang Pumped Storage Power Station spanned over a decade, reflecting the complexity of large-scale hydroelectric engineering in the region. Preliminary construction activities commenced in 2002, involving site preparation, geological surveys, and initial infrastructure development. Major construction works officially began in May 2011, accelerating the progress of civil engineering tasks such as tunneling, dam construction, and powerhouse excavation. This extended timeline allowed for the careful integration of the facility into the local topography and the coordination of various engineering disciplines to ensure the reliability of the 1,500 MW capacity target.

As a pumped-storage facility, the Liyang Power Station plays a crucial role in grid stability and peak-shaving capabilities. Pumped storage technology allows for the storage of excess electricity during periods of low demand by pumping water to an upper reservoir, which is then released through turbines to generate power during peak demand hours. This flexibility is particularly valuable in eastern China, where rapid industrial growth and urbanization have led to fluctuating energy consumption patterns. The 1,500 MW capacity provides substantial output, contributing to the reliability of the regional power supply and supporting the integration of variable renewable energy sources into the Jiangsu grid.

How does pumped storage work at Liyang?

The Liyang Pumped Storage Power Station operates on the fundamental principle of gravitational potential energy conversion, a mechanism essential for balancing electrical grids with variable generation sources. As a facility located in Jiangsu Province, eastern China, its primary function is to store excess electricity during periods of low demand and release it during peak consumption times, effectively acting as a large-scale battery for the regional power network. The system relies on the continuous circulation of water between two distinct reservoirs situated at different elevations, utilizing the topography of the Liyang area to maximize efficiency without requiring complex mechanical energy storage devices.

Charging Phase: Energy Storage

During off-peak hours, typically at night or when renewable energy generation exceeds immediate consumption, the grid supplies electricity to the power station’s reversible pump-turbine units. This electrical energy drives the turbines in reverse, functioning as pumps that lift water from the lower reservoir to the upper reservoir. This process converts electrical energy into gravitational potential energy. The lower reservoir serves as the primary source of water, often fed by local rivers or groundwater, while the upper reservoir acts as the storage tank. The elevation difference between these two bodies of water is critical; the greater the vertical distance, the more potential energy is stored per unit of water lifted. At Liyang, this infrastructure allows the station to absorb up to 1,500 MW of power when the grid is relatively flexible, preventing waste from variable sources such as wind or solar PV.

Discharging Phase: Power Generation

When electricity demand surges, such as during weekday afternoons or winter heating seasons, the stored water is released from the upper reservoir. Gravity pulls the water down through penstocks to the lower reservoir, spinning the turbine blades. The mechanical energy generated by the spinning turbines is converted back into electrical energy by generators, which is then fed into the transmission grid. This discharge phase provides rapid response capabilities, allowing the Liyang station to stabilize frequency and voltage fluctuations. The ability to switch from pumping to generating mode quickly makes pumped storage one of the most responsive forms of baseload and peaking power available. The station’s installed capacity of 1,500 MW signifies its significant contribution to the Jiangsu grid’s stability, having been commissioned in stages starting in 2017.

Grid Balancing and Efficiency

The operational cycle of the Liyang Pumped Storage Power Station is designed to optimize the broader energy mix in eastern China. By shifting water between reservoirs, the station helps smooth out the intermittency of renewable energy sources and provides spinning reserve for thermal and nuclear plants. The round-trip efficiency of modern pumped storage facilities typically ranges between 70% and 80%, meaning that for every 100 MW of electricity used to pump water uphill, approximately 70 to 80 MW is recovered during generation. This efficiency, combined with the longevity of the mechanical components and the relatively low operating costs compared to battery storage, makes the Liyang facility a strategic asset for long-term grid reliability. The preliminary construction began in 2002, with major works commencing in May 2011, reflecting the long-term planning required to integrate such large-scale hydroelectric infrastructure into the regional energy landscape.

History

The development of the Liyang Pumped Storage Power Station represents a multi-decade infrastructure project in Jiangsu Province, eastern China. Located 22 km south of the city of Liyang, the facility was designed to enhance regional grid stability through pumped-storage hydroelectric technology. The project’s timeline spans from initial preliminary construction phases in the early 2002s through to the operational commissioning of its first generating unit in 2017. This extended development period reflects the complex engineering and logistical requirements typical of large-scale pumped storage installations in China’s eastern economic corridor.

Preliminary Construction Phase

Preliminary construction activities for the Liyang Pumped Storage Power Station commenced in 2002. This initial phase involved site preparation, geological surveys, and the establishment of access infrastructure necessary for the subsequent major civil works. The location was selected for its topographical suitability for creating the upper and lower reservoirs essential for the pumped-storage cycle. During this period, the project moved from conceptual planning to physical ground-breaking, laying the foundational groundwork for the 1,500 MW capacity target.

Major Works and Civil Engineering

After a period of preliminary development, major construction works officially started in May 2011. This marked the acceleration of the project, involving the excavation of tunnels, the construction of powerhouse structures, and the installation of penstocks connecting the upper and lower reservoirs. The nine-year gap between the start of preliminary construction in 2002 and the commencement of major works in May 2011 suggests periods of financing alignment, environmental assessment, or phased engineering execution. The civil engineering efforts during this phase were critical to realizing the station’s design capacity of 1,500 MW.

Commissioning and Operational Status

The first unit of the Liyang Pumped Storage Power Station was commissioned in 2017, marking the transition from construction to operational status. This milestone confirmed the functionality of the hydroelectric turbines and the pumped-storage mechanism. As an operational facility, the station contributes to the energy infrastructure of Jiangsu Province, utilizing water as the primary energy storage medium. The commissioning in 2017 fulfilled the project’s initial goal of bringing the first generating capacity online, with the full installed capacity reaching the planned 1,500 MW. The station remains operational, serving as a key component of the regional power grid’s flexibility and reliability.

Technical Specifications

The Liyang Pumped Storage Power Station utilizes a reversible hydroelectric configuration to provide grid stability and energy storage. The facility is equipped with six reversible Francis pump-turbine units. Each unit has an individual installed capacity of 250 MW, contributing to the power station's total installed capacity of 1,500 MW. The use of Francis turbines is typical for pumped-storage applications due to their efficiency in both generating and pumping modes, allowing for flexible operation depending on grid demand and head conditions.

Installed Capacity and Unit Configuration

The power station's capacity is distributed across six identical units. This modular design allows for incremental commissioning and operational flexibility. The total capacity of 1,500 MW makes it a significant asset in the Jiangsu Province grid. The first unit was commissioned in 2017, marking the beginning of the station's operational life. The remaining units were subsequently brought online to reach the full installed capacity. The specific technical parameters of the turbines, such as the net head and rotational speed, are not detailed in the primary sources, but the Francis type indicates a medium-head application suitable for the topography south of Liyang.

Parameter	Value
Technology	Pumped-storage hydroelectric
Turbine Type	Reversible Francis
Number of Units	6
Capacity per Unit	250 MW
Total Installed Capacity	1,500 MW
Primary Fuel/Source	Water

Energy Generation and Consumption

As a pumped-storage facility, the Liyang Power Station functions by consuming electricity to pump water to an upper reservoir during periods of low grid demand and generating electricity by releasing water through the turbines during peak demand. While the total installed capacity is 1,500 MW, the annual energy generation and consumption figures depend on the operational cycle and the net head of the reservoirs. The primary sources do not provide specific annual generation or consumption values in GWh. The efficiency of the round-trip cycle is a key performance indicator for such stations, typically ranging between 75% and 80% for modern Francis units, though the exact efficiency for Liyang is not specified in the available data. The station's role is primarily for peak shaving and frequency regulation rather than baseload energy production.

Reservoir Infrastructure

Upper Reservoir and Dam Structure

The Liyang Pumped Storage Power Station relies on a robust upper reservoir infrastructure designed to manage the hydraulic head necessary for efficient energy conversion. This critical component is formed by a concrete-face rock-fill dam, a structural choice that balances flexibility and durability for the specific geological conditions of the Jiangsu Province site. The dam rises to a height of 165 m, creating a significant elevation difference between the upper and lower water bodies. This vertical distance is essential for generating the pressure required to drive the turbine generators during peak demand periods. The construction of this dam was a major phase of the project, which saw preliminary works begin in 2002 and major construction activities launch in May 2011. The engineering precision required for a concrete-face rock-fill dam of this scale ensures long-term operational stability for the facility, which was fully commissioned with its first unit coming online in 2017.

The storage capacity of the upper reservoir is a key parameter for the station's operational flexibility. The reservoir holds a total volume of 14,105,000 m3 of water. This volume allows the power station to store potential energy during periods of low electricity demand and release it rapidly when grid load increases. The capacity is carefully calibrated to support the station's total installed capacity of 1,500 MW, ensuring that the water supply can sustain generation for the typical duration of peak hours. The management of this water volume is critical for the efficiency of the pumped-storage cycle, where water is pumped back up to the reservoir using excess electricity and then released to generate power. The concrete face of the dam provides a watertight seal against the rock-fill core, minimizing seepage and maintaining the integrity of the 14,105,000 m3 storage volume over time.

Lower Reservoir and Shahe Integration

The lower reservoir of the Liyang Pumped Storage Power Station is strategically located adjacent to the existing Shahe Reservoir. This geographical arrangement allows the pumped storage facility to leverage the natural topography and existing water infrastructure of the region. The proximity to the Shahe Reservoir provides a stable water source for the lower basin, which receives the water discharged from the upper reservoir during power generation. This integration helps to optimize the water cycle, reducing the need for extensive new civil works for the lower basin. The location, situated 22 km south of Liyang in eastern China, benefits from this natural hydrological setting, which supports the continuous operation of the 1,500 MW plant.

The interaction between the Liyang facility and the Shahe Reservoir is a critical aspect of the station's hydraulic design. Water flows from the upper reservoir, through the penstocks and turbines, and into the lower reservoir, which is fed by and connected to the Shahe system. This setup ensures that the lower reservoir can accommodate the inflow during generation and provide sufficient water for pumping operations during off-peak hours. The design takes into account the water levels and flow rates of the Shahe Reservoir to maintain optimal operating conditions for the pumped storage units. This integration enhances the reliability of the power station, allowing it to function as a flexible asset on the Jiangsu grid. The operational status of the station, confirmed as operational since 2017, depends on the efficient management of this water transfer between the upper and lower reservoirs.

Why it matters

The Liyang Pumped Storage Power Station plays a critical role in stabilizing the energy infrastructure of eastern China, specifically within Jiangsu Province. As a pumped-storage hydroelectric facility with an installed capacity of 1,500 MW, it serves as a vital buffer for the regional grid, which is characterized by high industrial demand and increasing variability in power generation. The station is located 22 km south of Liyang, positioning it strategically to support the dense economic corridors of the region.

Economic Model: Capitalizing on Price Differentials

The operational significance of the Liyang station extends beyond simple energy storage; it functions as a financial instrument that capitalizes on electricity price differentials. Pumped storage operates on a model where the system consumes more energy than it produces, primarily due to thermodynamic and mechanical losses in the turbine-generator sets. However, the economic viability relies on the timing of energy consumption versus generation.

During periods of low electricity demand, typically at night or during mild weather, the grid often experiences a surplus of power. In these "off-peak" hours, electricity prices tend to be lower. The Liyang station draws power from the grid to pump water from the lower reservoir to the upper reservoir, effectively converting electrical energy into gravitational potential energy. This process absorbs excess capacity, preventing the grid from being overburdened and reducing the need for baseload generators to throttle down inefficiently.

Conversely, during "peak" hours—such as hot summer afternoons or cold winter evenings—demand surges, driving up the price per kilowatt-hour. At these times, the station releases the stored water through turbines to generate electricity. Because the energy is fed back into the grid when prices are highest, the revenue generated often outweighs the cost of the electricity consumed during the pumping phase. This arbitrage model allows the operator to profit from the spread between peak and off-peak prices, providing a financial incentive to maintain grid stability.

Grid Stability and Regional Impact

Beyond direct economic returns, the 1,500 MW capacity of the Liyang station provides essential ancillary services to the Jiangsu grid. Pumped storage plants offer rapid response times, allowing them to ramp up or down much faster than traditional thermal or nuclear plants. This flexibility is crucial for balancing the grid as eastern China integrates more variable renewable sources, such as wind and solar, which can cause fluctuations in frequency and voltage.

The station's commissioning in 2017 marked a significant milestone in the region's infrastructure development, following preliminary construction that began in 2002 and major works that started in May 2011. This long development timeline reflects the complex engineering required to integrate such a large-scale storage solution into the existing landscape. By providing a reliable source of dispatchable power, the Liyang Pumped Storage Power Station enhances the resilience of eastern China's energy system, ensuring that power supply can meet demand even during periods of high stress on the grid.

What distinguishes Liyang from other hydro plants?

Pumped-storage hydroelectricity operates on a fundamentally different mechanical principle than conventional run-of-the-river or reservoir-based hydroelectric plants. While traditional hydro facilities generate power by releasing water from a higher elevation to a lower one, often relying on seasonal rainfall or river flow, pumped-storage systems function as massive mechanical batteries. They utilize two distinct water bodies at different elevations: an upper reservoir and a lower reservoir. During periods of low electricity demand, typically at night or during peak renewable generation, surplus power is used to pump water from the lower reservoir to the upper one. When electricity demand peaks, the stored water is released back down through turbines to generate power, effectively converting potential energy into kinetic energy and then into electrical output.

Reversible Francis Turbines and Operational Flexibility

The Liyang Pumped Storage Power Station, located 22 km south of Liyang in Jiangsu Province, eastern China, exemplifies this technology through its use of reversible Francis turbines. These turbines are the workhorses of modern pumped-storage facilities. A Francis turbine is a reaction turbine that combines radial and axial flow concepts. In the context of Liyang, these units are designed to operate in two modes: as a turbine to generate electricity and as a pump to lift water. This dual functionality allows for rapid response times, enabling the plant to switch from pumping to generating in a matter of minutes, providing crucial grid stability and frequency regulation services.

The station was commissioned in 2017, with preliminary construction beginning in 2002 and major works starting in May 2011. Its installed capacity is 1,500 MW, making it a significant asset for the regional grid in eastern China. The use of reversible Francis turbines at Liyang allows for high efficiency in both pumping and generating modes, which is critical for the economic viability of pumped-storage projects. Unlike conventional hydro plants that may rely on a single direction of water flow, the reversible nature of these turbines means the same mechanical infrastructure can both consume and produce power, maximizing the utility of the civil engineering structures.

Dam Construction and Reservoir Dynamics

The specific dam construction type used at Liyang is tailored to accommodate the cyclic nature of pumped-storage operations. Unlike conventional hydro dams that often maintain a relatively constant water level, pumped-storage dams experience significant and frequent fluctuations in water volume. The upper reservoir at Liyang is designed to handle the daily or weekly "breathing" of the system, where water levels rise during pumping phases and fall during generating phases. This requires robust structural engineering to manage the stress of repeated filling and emptying, as well as careful geological selection to minimize seepage and ensure long-term stability.

The lower reservoir also plays a critical role, often utilizing an existing river or lake to reduce the civil engineering footprint. At Liyang, the proximity to the natural landscape of Jiangsu Province means that the integration of the upper and lower reservoirs with the local topography is essential. The 1,500 MW capacity is achieved through the coordinated operation of these reservoirs and the reversible turbine units, providing a flexible power source that complements the variable output of other energy sources in the region. The construction timeline, spanning from 2002 to 2017, reflects the complexity of building such large-scale civil works in a relatively flat eastern Chinese province, where creating sufficient elevation difference for efficient pumping requires significant earthmoving and reservoir creation.

Liyang Pumped Storage Power Station