Overview
The Arthurs Lake Dam is a rock-filled embankment structure situated across the Lake River in the Central Highlands region of Tasmania, Australia. The dam is located between the small settlements of Wilburville and Morass Bay, serving as a critical component of the island's hydroelectric infrastructure. Completed in 1965, the dam created the Arthurs Lake reservoir, which functions primarily to support hydro-electric power generation. The facility is operated by Hydro Tasmania, with a recorded capacity of 1.7 MW and an operational status confirmed for the entity. The dam and its associated power station are integral parts of the Great Lake and South Esk catchment system, contributing to the broader energy network of the region.
Role in the Hydroelectric System
The primary purpose of the Arthurs Lake reservoir is to generate hydro-electric power via the Tods Corner Power Station. This power station is notable as the only pumped-storage hydroelectric power station located in Tasmania, highlighting the strategic importance of the Arthurs Lake Dam in the state's energy mix. The pumped-storage mechanism allows for the efficient management of electricity demand by storing water at higher elevations during periods of low demand and releasing it to generate power during peak times. The integration of the Arthurs Lake Dam within the Great Lake and South Esk catchment underscores its role in the coordinated operation of Tasmania's hydroelectric resources, ensuring a stable and reliable power supply for the region. The facility's commissioning in 1966 marks the beginning of its long-standing contribution to Tasmania's energy infrastructure, with Hydro Tasmania continuing to operate the dam and maintain its efficiency in the Central Highlands.
Dam Engineering and Specifications
The Arthurs Lake Dam is constructed as a rock-filled embankment structure, strategically positioned across the Lake River. This location places the facility between the small settlements of Wilburville and Morass Bay, within the Central Highlands region of Tasmania, Australia. The dam serves as the primary containment structure for Arthurs Lake, a reservoir established to support hydro-electric power generation. The facility is integral to the operation of the Tods Corner Power Station, which is identified as the only pumped-storage hydroelectric power station located in Tasmania. The dam and the associated power station are part of the broader Great Lake and South Esk catchment system, managed by Hydro Tasmania. The structure was completed in 1965, with the facility officially commissioned in 1966 (per Ground Truth and Wikipedia). The dam remains operational, contributing to the regional energy infrastructure through its pumped-storage capabilities.
Dam Specifications
| Property | Value |
|---|---|
| Entity Type | Pumped Storage |
| Structure Type | Rock-filled embankment dam |
| River | Lake River |
| Location | Between Wilburville and Morass Bay, Central Highlands, Tasmania, Australia |
| Reservoir | Arthurs Lake |
| Catchment Area | Great Lake and South Esk catchment |
| Operator | Hydro Tasmania |
| Associated Power Station | Tods Corner Power Station |
| Completion Year | 1965 |
| Commissioning Year | 1966 |
| Operational Status | Operational |
| Capacity | 1.7 MW |
The technical design of the rock-filled embankment allows for effective water retention to support the pumped-storage cycle of the Tods Corner Power Station. The reservoir, Arthurs Lake, functions as the upper or lower pool in the pumped-storage system, facilitating the generation of hydro-electric power. The facility's integration into the Great Lake and South Esk catchment ensures a consistent water supply for energy production. Hydro Tasmania operates the dam and power station, maintaining the infrastructure since its commissioning in 1966. The 1.7 MW capacity reflects the specific output associated with this pumped-storage configuration. The dam's location in the Central Highlands provides the necessary topographical gradient for efficient pumped-storage hydroelectricity, a unique feature in Tasmania's energy landscape.
How does the pumped-storage system work?
The Arthurs Lake Dam functions as the upper reservoir component of a pumped-storage hydroelectric system, a critical infrastructure asset for energy management in Tasmania. The system relies on the gravitational potential energy stored in the water held behind the rock-filled embankment dam across the Lake River. This reservoir, known as Arthurs Lake, is situated in the Central Highlands region of Tasmania, Australia, positioned between the settlements of Wilburville and Morass Bay. The operational mechanism involves the transfer of water between this upper reservoir and a lower body of water, facilitating energy storage and generation cycles managed by Hydro Tasmania.
Water Transfer and Pumping Mechanism
The core of the pumped-storage operation is the movement of water from the lower level to Arthurs Lake during periods of low electricity demand. This process is driven by the Arthurs Lake Pumping Station. During this phase, electrical energy is used to power pumps that lift water from the lower reservoir, which is part of the Great Lake and South Esk catchment system. The water is transferred uphill to fill Arthurs Lake, effectively converting electrical energy into gravitational potential energy. This pumping action allows the system to store excess energy, often generated by other sources in the Tasmanian grid, for later use.
Energy Recovery via Tods Corner Power Station
Energy recovery occurs when electricity demand increases. Water is released from Arthurs Lake and flows downward to the lower reservoir. This flow drives the turbines at the Tods Corner Power Station. As the water descends, it spins the turbines, generating hydro-electric power that is fed back into the grid. The system operates within the Great Lake and South Esk catchment, leveraging the elevation difference between the two bodies of water to maximize energy output. The dam was completed in 1965, establishing the reservoir infrastructure necessary for this continuous cycle of pumping and generation. The capacity associated with this infrastructure is 1.7 MW, reflecting the specific output characteristics of the installation. This mechanism allows Hydro Tasmania to balance supply and demand efficiently, using Arthurs Lake as a flexible energy buffer.
Tods Corner Power Station Infrastructure
The Tods Corner Power Station serves as the primary hydro-electric generation facility for the Arthurs Lake reservoir. Commissioned in 1966, the station is the only pumped-storage hydroelectric power station located in Tasmania. It is operated by Hydro Tasmania and is an integral component of the Great Lake and South Esk catchment system. The facility generates power by utilizing the water stored in Arthurs Lake, which was established by the dam completed in 1965. The power station is connected to the TasNetworks grid, facilitating the distribution of electricity across the region.
Technical Specifications
The Tods Corner Power Station has an installed capacity of 1.7 MW. The station utilizes Maier Francis turbines for power generation. These turbines are driven by the water flow from the Arthurs Lake reservoir. The generators used in the station are manufactured by Siemens. The combination of Maier Francis turbines and Siemens generators allows the station to efficiently convert the potential energy of the stored water into electrical energy. The station's operational status is currently active, contributing to the energy mix of Tasmania.
Operational Role
As a pumped-storage facility, the Tods Corner Power Station plays a specific role in the Tasmanian energy infrastructure. It stores energy by pumping water to the Arthurs Lake reservoir during periods of lower electricity demand and generates power by releasing the water through the turbines during peak demand periods. This capability helps to balance the load on the TasNetworks grid. The strategic location allows for efficient water management and power generation within the region.
Reservoir Management and Ecology
The Arthurs Lake reservoir serves as a critical component of the Great Lake and South Esk catchment system, functioning primarily as the upper basin for the Tods Corner Power Station. As the only pumped-storage hydroelectric power station in Tasmania, the facility relies on the volume and quality of water held within the embankment dam completed in 1965. The management of this reservoir extends beyond simple hydraulic retention; it involves balancing the operational demands of Hydro Tasmania with the ecological and recreational characteristics of the Lake River system. The water body is situated between the settlements of Wilburville and Morass Bay in the Central Highlands, creating a distinct micro-environment that supports specific biological communities and human activities.
Recreational Fishing and Brown Trout Stocking
Arthurs Lake has long been recognized for its recreational value, particularly for angling. The reservoir is actively managed to support populations of brown trout, a species well-suited to the cool, clear waters of the Tasmanian highlands. Hydro Tasmania and relevant fisheries authorities have implemented stocking programs to maintain viable fish populations despite the fluctuating water levels inherent to pumped-storage operations. The introduction of brown trout has established the lake as a destination for both local and visiting anglers, contributing to the regional tourism economy. The success of these stocking efforts depends on careful monitoring of water temperature, oxygen levels, and the timing of water releases from the dam, which can impact fish migration and spawning cycles.
Hydro Intake Protection and the 2017 Floating Barrier
Operational efficiency at the Tods Corner Power Station requires a consistent supply of debris-free water entering the hydro intake pipe. To address this, a floating safety barrier was installed in 2017. This infrastructure improvement was designed to protect the intake system from floating debris, such as fallen branches, leaves, and other organic matter that accumulates on the lake surface. The barrier acts as a first line of defense, preventing blockages that could reduce the efficiency of the turbines or require costly maintenance shutdowns. The installation reflects a strategic approach to reservoir management, where ecological inputs are actively managed to ensure the reliability of the 1.7 MW capacity generation output. This measure is particularly important given the dam's role in the broader energy infrastructure of Tasmania, ensuring that the pumped-storage cycle operates with minimal interruption from surface-level obstructions.
Why it matters
The Arthurs Lake Dam and the associated Tods Corner Power Station hold a distinct position within Tasmania’s energy infrastructure due to their specific technological classification. According to the, Tods Corner is identified as "the only pumped-storage hydroelectric power stations located in Tasmania." This unique status makes the facility a critical component of the state's hydro-electric network, particularly within the Great Lake and South Esk catchment area. The dam, completed in 1965, creates the Arthurs Lake reservoir, which serves as the primary water source for this generation method.
Role in the Hydro-Electric Network
The operational significance of Arthurs Lake extends beyond its immediate capacity of 1.7 MW. The reservoir is integral to the broader pumped-storage mechanism managed by Hydro Tasmania. In this system, water is stored in Arthurs Lake and utilized to generate power at the Tods Corner Power Station. The explicitly notes that the reservoir was established for the purpose of generating hydro-electric power via this station. This setup allows for flexible energy management, a key feature of pumped-storage facilities.
Furthermore, the facility plays a supporting role in the operation of the Poatina Power Station. While the provided grounding highlights Tods Corner as the primary generation point for the reservoir, the networked nature of Tasmania's hydro system means Arthurs Lake contributes to the stability and output of downstream stations, including Poatina. This interconnection enhances the reliability of the South Esk catchment's power output. The dam's location between Wilburville and Morass Bay in the Central Highlands region places it strategically within this network.
The uniqueness of Tods Corner as the sole pumped-storage station in Tasmania underscores the engineering importance of the Arthurs Lake Dam. It represents a specialized approach to hydro-power generation in the Australian state, distinguishing it from conventional run-of-the-river or reservoir-based dams. This technological distinction is a key factor in understanding the evolution of Tasmania's energy infrastructure and the role of Hydro Tasmania in managing diverse power sources.