Alkimos Water Precinct power supply upgrade
Project goal:
To construct and operate the Alkimos Seawater Desalination Plant, we need to upgrade the power to the Alkimos Water Precinct.
Status:
In progress
Delivery Date:
Construction is planned to begin from around late October 2024 and is expected to be completed in late 2025.
What’s happening?
We are working with Western Power's contractor to install and connect a transmission line to the Alkimos Water Precinct. It will run approximately 5km underground from Western Power's Yanchep Substation on Wanneroo Road, via Romeo Road and Graceful Boulevard before connecting into the Alkimos Water Precinct.
This will be installed by a combination of open trenching and tunnelling under main roads.
Where is this happening?
| Stage | Area | Construction activity | Timeframe |
| Stage 1 – Marmion East
Conduit install |
East of Marmion, along Romeo Road between Marmion Avenue and the Yanchep Substation near Wanneroo Road. |
Combination of tunnelling under major roads and open trenching in the verge and road. |
From late October 2024* |
|
Stage 2 – Marmion West Conduit install |
West of Marmion, along Graceful Boulevard between Marmion Avenue and Pectoral Avenue (as the transmission line enters the Alkimos Water Precinct for connection). |
Installing the conduit pathway below ground that will house the new transmission cable. |
Late 2024 to Mid 2025* |
|
Stage 3 – Installing and joining cable |
The full route between the Yanchep substation and the Alkimos Water Precinct, in a staged approach. |
Installation and final connection of transmission line and final reinstatements. |
Mid to late 2025* |
*There will be some overlap as stage 1 finishes and stage 2 begins. Construction timings subject to change.
What will be the impacts of Stage 1?
We’ll be starting along Romeo Road, between Wanneroo Road and Marmion Avenue. This will involve installing conduit, which is a plastic sleeve underground, that the new transmission line will be installed into during stage 3.
- Work will occur in sections, in a staggered approach along Romeo Road, between Marmion Ave and Wanneroo Road. Work will take place in the road reserve and outer lanes of Romeo Road.
- At times throughout the work, some roads will merge in order to reduce road closures. Traffic management will be in place to direct traffic safely.
- Tunnelling will occur under main roads, including the Romeo Road Mitchell Freeway entry and exit, Romeo Road, Benenden Avenue and Marmion Avenue. At times throughout the work, some roads will merge in order to reduce road closures. Traffic management will be in place to direct traffic safely.
- Longnor Parkway will be closed temporarily while the conduit is installed via open trench.
- Additional detours may be required for the Mitchell Freeway entry on-ramp and exit off-ramp.
- You may notice a temporary increase in construction noise, dust and activity in the area. We’ll endeavour to minimise these impacts where possible.
- More information about Stage 2 and 3 will be shared in the coming months.
The map below shows the area of stage 1, and the locations of open trenching and tunnelling.
Learn more about the Alkimos Seawater Desalination Plant project
Keep up to date with the Alkimos Seawater Desalination Plant, by visiting our project page
Alkimos Seawater Desalination Plant
- It is unlikely that any power supply interruptions will be required for this work. If an outage is required, Western Power will inform customers in advance.
- This power supply upgrade will benefit the Alkimos Water Precinct. Wester Power has a separate program of work to reinforce and strengthen the grid in the area and across its network. Please contact Western Power for more information.
- We understand that construction work can impact small businesses. We work with the City of Wanneroo and the Small Business Development Corporation to support affected businesses during our essential work. We encourage businesses to let us know how we can minimise impacts on their business during construction.
Community Engagement