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    Project Marinus

    Project Marinus is a committed major infrastructure project comprising Marinus Link and the North West Transmission Developments (NWTD). Together, they will connect Tasmania and Victoria through new electricity and telecommunications infrastructure, and upgrade Tasmania’s transmission network to support this increased interconnection.

    Shareholder Arrangements

    Tasmania, Victoria and the Australian governments will continue to work together as shareholders in Marinus Link Pty Ltd (MLPL), ensuring strong governance and oversight as the project progresses.

    Construction

    Construction for Stage 1 of Marinus Link is expected to begin in 2026, and is intended to commence commercial operation in 2030.

    The NWTD will upgrade Tasmania’s transmission network to support this new interconnection, ensuring the state can continue to play a leading role in Australia’s renewable energy transition.

    Final Investment Decision

    On 1 August 2025, the Tasmanian, Victorian and Australian governments confirmed a Final Investment Decision (FID) to proceed with Stage 1 of Project Marinus. This decision was informed by the Whole of State Business Case, independent expert input, and advice from relevant government agencies. It followed the completion of detailed technical assessments, financial modelling, and intergovernmental processes.

    Stage 1 of Project Marinus will enable electricity to be imported and exported between Tasmania and mainland Australia. It is part of broader planning for the transition to renewable energy within the National Electricity Market.

    Project Marinus Governance

    The Tasmanian Government has agreed governance arrangements in place to manage its interest in Project Marinus, detailed here in the Project Marinus Governance Framework (PDF 599.3 KB)

    The Governance Framework provides an overview of the governance arrangements established by the Tasmanian Government, in conjunction with other Shareholding Governments, to support appropriate shareholder oversight of Project Marinus.

    The Framework describes the respective roles and responsibilities of TasNetworks, MLPL, their Boards, Shareholding Ministers and relevant government forums during the delivery phase of the project. It is intended to promote transparency and understanding of how accountability, risk escalation, reporting and assurance are structured for this major infrastructure investment.

    This Framework does not replace, override or amend any statutory, contractual or corporate governance obligations applying to TasNetworks or MLPL. Responsibility for project delivery remains with the respective project entities and their Boards, in accordance with applicable legislation, Shareholders’ Agreements and corporate governance arrangements.

    Further information

    Further information, including the Whole of State Business Case and summary documents, is available via the links below.

    Disclaimer

    The advice contained in these documents is based on point-in-time information and inputs provided by third parties. Publicly available sources may report varying figures depending on their respective methodologies and timing.

    The FID Assessment has deliberately adopted a more conservative approach to benefit estimation and a more pessimistic outlook to project cost to ensure decision-making is robust to downside outcomes.

    Documents have been redacted to protect confidential and commercially sensitive information, at the request of the following affected parties: TasNetworks, Marinus Link Pty Ltd, Hydro Tasmania, Clean Energy Finance Corporation and the Australian Government.

    Further information