Interest heating up for geothermal potential in Victoria, Australia

Interest heating up for geothermal potential in Victoria, Australia Opening of Gippsland Regional Aquatic Centre, Victoria, Australia (source: Rockwater)
Alexander Richter 6 Sep 2021

There is an increasing interest in the geothermal potential for the state of Victoria, Australia with hot spring resort plans and need for heated water pools.

A new hot springs resort and swimming pool are highlighting the potential of naturally heated water sitting under Gippsland – and a renewed interest in the science behind it.

When picturing hot springs, Victorians usually think of Hepburn Springs or the popular thermal baths on the Mornington Peninsula.

One region unlikely to come to mind is Gippsland, yet the area is emerging as a literal hotspot for the geothermal energy that powers hot springs – something some locals have been discussing the potential of for 50 years.

The Latrobe City Council recently opened the Gippsland Regional Aquatic Centre in Traralgon, the first public aquatic facility in Victoria to incorporate a deep bore geothermal heating system.

The Centre taps into an aquifer more than 600 metres below ground where the water is above 60 degrees Celsius, heating the community pool naturally and cheaply.

Earlier this year saw the announcement of the Metung Hot Springs after funding from the Gippsland Tourism Recovery Package and Local Economic Recovery program was confirmed in the wake of the bushfires.

The first construction stage of a new AU$100 million hot springs resort is set to kick off soon, and is due to open in summer.

More and more economies around the world are exploring geothermal as a renewable energy source. Gippsland isn’t being left behind, with the Latrobe Valley Authority working with the state’s geoscience agency, the Geological Survey of Victoria (GSV), and the University of Melbourne to carry out geothermal mapping of the region.

“Imagine a hot water tap that comes out of the ground – direct use of geothermal energy is exactly that. But the two main factors prohibiting people from using this energy are knowledge of how deep the water is, and how hot it is,” says GSV Hydrogeologist Cassady O’Neil.

The team at GSV have used data from lowering thermometers down 285 ground water bores around the region to create a 3D temperature map of the underlying aquifers, including the promising Latrobe Group aquifer.

The goal of the project is to increase understanding of the groundwater temperatures and map the temperature of Gippsland aquifers to assist in geothermal adoption by communities and industry.

“There are established geothermal projects in Werribee and the Mornington Peninsula, and the Gippsland Basin is also looking promising. The temperature can be as high as 90 degrees – perfect for direct use of the water,” says Cassady.

University of Melbourne Senior Fellow in Crustal Heat Flow, Dr Graeme Beardsmore, says it is coal that makes the area a prime location for harnessing geothermal power.

“Heat flowing from the centre of the earth warms the water underground. The 300 metres of coal close below the surface of Gippsland acts as a thick blanket of thermal insulation that keeps the water underneath much hotter than in other locations,” he says.

Around the world, businesses are using geothermal energy more and more in aquaculture, greenhouse food production, spa resorts, and pools.

GSV believe the 8,085 km2 geothermal map to be released later this year will provide more local organisations with confidence to utilise geothermal resources.

Source: Earth Resources/ Connection Victoria, Earth Resources Victoria, Australia