Project Marinus
Tasmanian Government Final Investment Decision on Project Marinus
The Tasmanian Government is currently operating in Caretaker mode due to the 19 July 2025 Tasmanian election. Project Marinus is of significant public interest therefore the following information has been made available.
The Tasmanian Government has confirmed a Final Investment Decision (FID) to proceed with Stage 1 of Project Marinus. The decision follows the completion of technical assessments, financial modelling and intergovernmental processes.
The government’s decision was informed by the Whole of State Business Case, independent expert input and advice from relevant government agencies.
Project Marinus comprises Marinus Link and the North West Transmission Developments (NWTD). Marinus Link is a proposed undersea and underground electricity and telecommunications interconnector between North West Tasmania and Victoria, to be delivered in two 750-megawatt stages from 2026. The NWTD will upgrade Tasmania’s transmission network to support this increased interconnection. Together, these are collectively referred to as Project Marinus – with a FID confirmed for Stage 1 of Project Marinus.
Project Marinus Stage 1 is intended to enable electricity to be imported and exported between Tasmania and the mainland. It is part of broader planning for changes in the National Electricity Market, including the transition to renewable energy sources.
Tasmania, Victoria and the Australian governments will continue to work together as shareholders in Marinus Link Pty Ltd.
Planning and development activities will now continue with construction expected to begin in 2026.
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.