A 115 kilometre 220-kilovolt overhead transmission line will connect the Renewable Energy Parks to the Tasmanian transmission network. Planning with TasNetworks has started, including exploring a potential route.
It’s important we find the best pathway that minimises impacts to properties, public land and the environment as much as possible.
Plans for a new transmission line
Our current plan for the new transmission line:
- Cables embedded into the bridge to move electricity from Robbins Island to mainland Tasmania
- Cables connect to an overhead transmission line that continues to the Jim’s Plain substation
- A transmission line connects Jim’s Plain Substation to the TasNetworks Hampshire to Staverton line at Hampshire
TasNetworks will be developing the Hampshire to Staverton line as part of its planned North West Transmission Development design to optimise renewable energy potential for Marinus Link and the Battery of the Nation developments. You can learn more at the TasNetworks website.
How the transmission line route is determined
The transmission line route is being determined through studies and consultation with directly affected landowners, stakeholders and planning authorities.
A preferred route will be subject to further consultation and planning approvals. We’ll continue to share information along the way.
What we consider when planning the route:
- Built up and sensitive areas: areas where people live and have property
- Public land: reserved land, timber production areas and forests
- Vegetation and threatened species: flora and fauna, vegetation communities and environmentally protected species
- Planning schemes relevant zones and overlays
Other options we explored for the connection
We also looked at some other options for how to connect to the Tasmanian transmission network. These include:
- Option 1: a new transmission line to the existing Smithton Substation
- Option 2: a new transmission line to the existing Burnie Substation
Our analysis of these options showed us that neither substation has capacity for the extra power generated by the Renewable Energy Parks.
Connecting to the National Electricity Market
We also explored the possibility of a direct connection across Bass Strait to the National Electricity Market in Victoria, including a T-connection to Marinus Link.
The cost of directly connecting across Bass Strait was approximately $1.5 - $2 billion which was too expensive and would make the project uneconomic.
The ability to T-connect to Marinus Link was also explored and found to be technically difficult and cost prohibitive. It would also be subject to Marinus Link's viability which is still to be confirmed.
Connecting to the strongest part of the Tasmanian transmission network and developing in conjunction with Marinus Link and Battery of the Nation will maximise project value. It will create jobs and economic activity, eventually lower power prices and allow for the export of excess energy to the mainland.
The transmission line towers will likely be 45 to 55 metres high.
On average they will be 400 metres apart, but these distances will vary depending on the route and landscape.
Each tower is micro-sited, meaning we'll look at the on-the-ground conditions and plan the route to minimise impacts.
Explore our proposed transmission line
Our interactive map lets you view an area with text, images and multimedia content. It makes it easy to geographically explain our transmission line from Robbins Island to Hampshire.