Project Marinus
Project Marinus is a major infrastructure initiative 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.
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.
Construction
Construction for Stage 1 of Marinus Link is expected to begin in 2026.
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.
Shareholder Arrangements
Tasmania, Victoria and the Australian governments will continue to work together as shareholders in Marinus Link Pty Ltd, ensuring strong governance and oversight as the project progresses.
Further information
Further information, including the Whole of State Business Case and summary documents, is available via the links below.
- Project Marinus Stage 1 Final Investment Decision Summary (PDF 3.1 MB)
- Project Marinus Stage 1 Final Investment Decision Snapshot (PDF 10.0 MB)
- Project Marinus Expert Advisory Panel Report (PDF 340.1 KB)
- Project Marinus Final Investment Decision Assessment Report (PDF 9.0 MB)
- Project Marinus Stage 1 Final Investment Decision Assessment Report – Addendum 31 July 2025 (PDF 346.4 KB)
- Project Marinus Whole of State Business Case
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 can be found below.