Marinus Link


Prospective pipeline

Credibly proposed


Under procurement

Preferred bidder announced

Recently closed
Marinus Link

Prospective pipeline

Greenfield (construction) or brownfield (government asset divestment) projects needed or likely to occur within the next five years, but is not formally proposed by a state, territory or major local government.

Credibly proposed

The project or divestment is supported by a state, territory or major local government, is subject to studies or other processes (such as pre-feasibility or scoping studies or business case development), and is likely to proceed to formal announcement.   


The project has a firm commitment and timeline from a state, territory or major local government, but has not yet entered the market.

Under procurement

The project or transaction is under procurement (such as a call for Expressions of Interest, requests for tender, or another offer to the market).

Preferred bidder announced

A preferred bidder has been selected and is in exclusive negotiations.

Recently closed

Projects that have progressed to contractual close remain on ANZIP for 12 months.

ANZIP is focused only on major infrastructure activity, above the following thresholds:


Construction projects: > AUD$300m

Investable greenfield & brownfield: > AUD$100m

New Zealand

All greenfield and brownfield projects and divestments: > NZD $100 million

STATUS: Credibly proposed
VALUE: $5.14bn AUD
SECTOR: Energy
TYPE: Greenfield
Project Scope

The Second Bass Strait Interconnector (Marinus Link) is a proposed 1,500 megawatt (MW) undersea electricity connection between Tasmania and Victoria, with supporting transmission infrastructure. The project is being developed by TasNetworks, and would operate in addition to the existing Basslink interconnector.

Stage 1 of the project would see a 750 MW high voltage direct current (HVDC) link between Burnie in
Tasmania and Hazelwood in Victoria, with supporting network augmentations in Tasmania. The Australian Energy Market Operator's (AEMO) 2020 Integrated Systems Plan (ISP) estimates that this stage has a cost of between $1.3 billion and $2.4 billion, with a modelled cost of $1.845 billion. Stage 1 is estimated to be delivered between 2028-29 and 2031-32, subject to approvals.

Stage 2 would involve a second 750 MW HVDC cable. AEMO's 2020 ISP estimates that this stage has a cost of between $2.2 billion and $4.1 billion, with a modelled cost of $3.155 billion. Stage 2 is estimated to be delivered between 2031-32 and 2035-36, subject to approvals.

AEMO's 2020 ISP also estimates that there would be $140 million of early works across both stages.


Key Dates
2028-29 to 2021-32: Stage 1 to be delivered, subject to approvals
2031-32 to 2035-36: Stage 2 to be delivered, subject to approvals

Federal Government: $56,000,000 through Australian Renewable Energy Agency (ARENA) for project development
Tasmanian Government: $0

Apr 2017: Tamblyn Review, an initial report into the feasibility of a Tasmanian second interconnector was released.
Nov 2017: TasNetworks announced it would undertake a $20 million assessment of the feasibility and business case for a second Bass Straight interconnector, with assistance from ARENA.
Jul 2018: TasNetworks released the Project Specification Consultation Report for public consultation, which examines the case for further interconnection between Tasmania and Victoria. The document applies the regulatory test for transmission (RIT-T) process to determine whether the project is in the long-term interest of customers.
Feb 2019: A business case study examining the preferred route, optimum size, cost estimate, revenue investment test and financial model for a second interconnector was released.
Dec 2019: The Project Assessment Draft Report (PADR) and Business Case Assessment were released for consultation. The PADR proposed splitting the project into two stages.
Jun 2020: The Federal Government announced that Federal planning approvals for the project will be fast-tracked under a bilateral model between the Federal and Tasmanian Governments.
Jul 2020: In its 2020 Integrated System Plan, AEMO identified Marinus Link as a critical project and provided updated costings for Stages 1 and 2.

Further Information
The project is included under the broader National Electricity Market, which Infrastructure Australia identifies as a High Priority Initiative on its Infrastructure Priority List. The project was previously listed a Priority Initiative of long term (10-15 years) importance.


Last reviewed: 05/08/2020

Presented by

Government sponsors


Supporting agencies