Repurposing old assets

The challenge

What can we do to ease Australia's transition toward sustainable energy?

In this article

  • Why it's important that we remediate and repurpose ageing infrastructure as Australia transitions toward sustainable energy sources.
  • What we needed to consider when remediating the La Trobe Valley's Hazelwood power plant.
  • How and why we selected concentrated solar power (CSP) over a suite of other energy options as the most appropriate solution.

Australia is in the midst of an energy metamorphosis. As we push aside coal and gas in exchange for solar and wind energy we need to consider how we fully embrace the opportunities made possible by this transition. How can we repurpose the mines and powerplants that once electrified our nation? Are there ways to keep this infrastructure productive as we move toward a new economy?

Hazelwood, a brown coal-fuelled power station in Eastern Victoria's La Trobe Valley, shut its doors in March 2017. At one time, Hazelwood contributed 26% of Victoria's electricity. One month after the station's shutdown Alex Reilly, an engineer with an interest in sustainable energy, began considering possible futures for the brownfield site.

Construction of the Hazelwood station circa 1955. Photo ENGIE

Resilient Resources

The repurposing of the site came up as a natural choice. Alex and the team were inspired by The Eden Project in the UK. The Eden site was once a clay pit. Since closing in 1995 it has has been remediated and transformed into the world’s largest indoor rainforest. The biosphere and tourist attraction doubles as a facility for sustainability and ecological education. Hazelwood is comparable in that the site poses numerous ongoing environmental risks that require innovative remediation techniques.

“It was Eden’s education focus that caught our attention,” says Alex. “We wanted see if we could generate and store electricity on site. But also build a facility that can upskill and train people.”

The team began by listing renewable energy options that might be appropriate for the region. At first they didn’t have much luck. Tidal energy was obviously out of the question—the site is nearly 100 km from the nearest ocean.  Even counting the depth of the mine pit there wasn’t enough elevation for pumped hydro. Due to the Latrobe Valley climate, wind energy was also ruled infeasible and there was not enough solar radiation for traditional photo-voltaic solar panels. Alex and his colleagues were quickly running out of options when they decided to investigate concentrated solar power (CSP.)

CSP systems differ from conventional photo voltaic systems in that they use mirrors to track the movement of the sun and concentrate its radiation on to a small fixed area. The heat from this intensely concentrated beam can then be used to generate power. While it’s still too early to determine whether CSP will provide a complete solution for Hazelwood, a desktop study by the team indicates strong potential. 

Moreover, the simple act of imagining alternative futures has already been a valuable in exploring what it takes to inject new life into an aging site.

“The understanding we now have about the constraints of the site and what makes a renewable energy project viable will be useful as we continue to see sites like Hazelwood become available,”  says Alex. 

This fits within a broader range of energy research projects, which are designed to help us respond to the cost, access, and environmental impacts of a rapidly changing energy generation mix country wide.

The ability to imagine and provide evidence for different outcomes of brownfield sites is critical to bringing about new futures. Research projects like this help us to proactively rethink how we create energy and use land as we move toward a more sustainable tomorrow.

Inside the Eden Project in Cornwall. Photo Graham Gaunt.


  • Early investigations indicate that concentrated solar power may be an appropriate energy solution for the remediated Hazelwood site. Further studies now need to be done on the ground to confirm the viability of the technology, such as testing the sun's direct normal irradiance.
  • As with any energy generation and storage technology, the CSP system selected must be able to integrate into the site's grid.
  • The methodology we used to assess Hazelwood for appropriate solutions can be translated to a number decommissioning power station. These sites are becoming increasingly available as Australia migrates toward new energy systems.

This story was written by Jeff McAllister, as part of the Research Review. This series is produced by the Arup Australasia Research team; Alex Sinickas, Bree Trevena and Jeff McAllister with contributions from Sheda and Noel Smyth.

Lead Arup Researcher

Alex Reilly
Mechanical Engineer, Melbourne office

Ask Alex about

  1. How concentrated solar power (CSP) systems work and how they differ from photovoltaic solar systems
  2. How the team modelled appropriate energy solutions for the site and how they settled on CSP
  3. The unique challenges in remediating a coal power plant site like Hazelwood


Research TEAM

David is our Australasian Regional Environment and Sustainability Leader.
Ash is an engineer working in planning.
Shadee is an engineer working in transport and resources.
Amy is a consultant working across environment and resources.

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