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| Marinus Link | |
|---|---|
| Name | Marinus Link |
| Type | Electricity transmission interconnector |
| Location | Bass Strait, Tasmania–Victoria, Australia |
| Status | Planned / Under development |
| Length | ~250–300 km (sea and land combined) |
| Capacity | up to 1500 MW (proposed) |
| Voltage | HVDC ±320 kV to ±525 kV (proposed) |
| Owner | Australian Renewable Energy Agency; state and private consortia stakeholders (subject to change) |
| Operator | TasNetworks / Victorian network operators (proposed) |
Marinus Link is a proposed high-voltage electricity transmission line intended to connect the power systems of Tasmania and the Australian mainland via the Bass Strait. Conceived to enable bulk transfer of renewable energy, the project proposes a subsea and underground high-voltage direct current (HVDC) interconnector between Tasmania and Victoria, integrating with existing assets such as the Basslink cable and the Tasmanian hydroelectric system operated by Hydro Tasmania. Proponents view the link as a strategic infrastructure element in national energy transition plans involving Australian Energy Market Operator, Clean Energy Finance Corporation, and state governments.
The initiative was developed in response to national policy debates on renewable integration involving the National Electricity Market, the Australian Renewable Energy Agency, and planning by regional transmission networks like TasNetworks and AusNet Services. Project studies referenced scenarios modelled by AEMO and independent consultants, assessing potential HVDC technology options used internationally in projects such as NorNed, East–West Interconnector (Ireland) and Basslink. The proposal has attracted interest from private developers, institutional investors including IFM Investors-style funds, and federal entities, while stimulating engagement with stakeholders such as Local Government Associations, indigenous groups represented via Tasmanian Aboriginal Centre, and environmental NGOs including Australian Conservation Foundation.
Route planning considers a combination of subsea cable across the Bass Strait and onshore underground or buried transmission corridors through Tasmania and Victoria, linking into converter stations at points tied to existing substations like those near George Town, Tasmania and the Latrobe Valley. Technical options evaluated include HVDC voltage-source converter (VSC) technology and line-commutated converter (LCC) variants, with proposed ratings in the range of 750–1500 MW and bipolar voltages from ±320 kV to ±525 kV consistent with modern long-distance HVDC links such as NEL (NordLink) and HVDC Cross-Channel. Engineering assessments examine seabed routing to avoid sensitive areas like the Tessellated Pavement and shipping lanes near King Island, and onshore corridor selection to minimize impacts on assets including the Mersey River catchment and agricultural land near the Mersey–Forth region.
Advocates argue the link will provide capacity for large-scale transfer of hydroelectric dispatchable energy from Hydro Tasmania storage to mainland markets during peak demand or low renewables output, supporting integration of wind farms in regions like the North-West Tasmania wind zones and large-scale solar in Victoria and South Australia. By enabling greater import/export flexibility, the interconnector is positioned as a tool for system security alongside assets such as synchronous condensers and grid-forming inverters, and as complement to distributed resources including projects by AGL Energy, Origin Energy, and CleanCo. Economic assessments reference potential wholesale market effects modelled by AEMO and forecasting groups, and alignment with national objectives expressed in policy instruments from the Commonwealth of Australia and state energy strategies.
Environmental impact studies consider effects on marine habitats in the Bass Strait, migratory pathways for species monitored by programs involving Parks Australia and Department of Agriculture, Water and the Environment, and terrestrial ecosystems in corridor areas subject to management by agencies like Tasmanian Parks and Wildlife Service. Cultural heritage assessments have engaged representative organisations such as the Tasmanian Aboriginal Centre and local councils to survey heritage sites and ceremonial places. Proponents propose mitigation measures informed by precedents in subsea cable projects like SAPEI and NSW–VIC interconnector studies, including route adjustments, trenching techniques, seasonal work windows, and biodiversity offsets negotiated with agencies including Environment Protection Authority (Tasmania).
Permitting pathways require consents under state planning regimes in Tasmania and Victoria, environmental approvals related to the Environment Protection and Biodiversity Conservation Act 1999 processes, and compliance with technical standards enforced by Australian Energy Regulator and National Electricity Rules. Proponents have undertaken public consultation, technical working groups with transmission planners, and Indigenous heritage protocols coordinated with bodies such as the Tasmanian Aboriginal Centre and local shires including Waratah–Wynyard Council. Investment approvals involve due diligence by agencies and financiers including ARENA and commercial banks subject to risk assessments similar to those used for interstate infrastructure like the Inland Rail project.
Cost estimates have varied across feasibility studies, with headline figures reported in the order of several hundred million to multiple billions of Australian dollars depending on capacity and route choices, reflecting capital expenditures observed in comparable projects such as NSW–VIC interconnector upgrades and European HVDC schemes like NordLink. Financing structures under consideration combine state contributions, equity from private developers, debt from institutional lenders, and potential support from federal programs including ARENA and the Clean Energy Finance Corporation. Construction staging contemplates procurement of long lead items such as HVDC converters and subsea cable manufacturing by global suppliers that have delivered projects for Siemens Energy, ABB, and Prysmian Group, with project management coordinated by experienced contractors in marine works and civil infrastructure.
Operational planning addresses integration with AEMO dispatch systems, coordination with existing interconnectors like Basslink and regional networks managed by TasNetworks and AusNet Services, and maintenance regimes for subsea assets informed by inspection practices from projects such as NordLink and offshore utilities managed by Offshore Energy operators. Long-term scenarios include potential uprating, additional circuits, and complementary investments in grid-forming technologies and synchronous services provided by entities like Hydro Tasmania and new battery storage projects by firms including Tesla-partnered ventures. Ongoing policy shifts and market rules governed by Australian Energy Market Commission could influence final technical specification, timing, and commercial arrangements.