Leslie Massey
Australia has abundant sunshine and wind, and it is believed that it may also hold vast reserves of geothermal energy deep underground. Geothermal energy is the Earth's natural heat, generated by the decay of radiogenic elements such as uranium, thorium, and potassium over millions of years. It can be used to heat and cool buildings, support agriculture, and provide reliable, low-emission electricity. While Australia has considerable geothermal energy potential, as of May 2022, no geothermal power plants are operating in the country. However, a recent Australia-wide census by the Australian Geothermal Association (AGA) showed that geothermal energy is already widely used in Australia, and it could play a significant role in the country's energy transition.
| Characteristics | Values |
|---|---|
| Status of geothermal power plants in Australia | As of May 2022, no geothermal power plants are operating in Australia. |
| Potential of geothermal energy in Australia | Australia has vast reserves of clean energy deep underground and geothermal energy is a round-the-clock, stable energy source that can help heat and cool buildings, support agriculture, and provide reliable electricity while reducing carbon emissions. |
| Challenges | High upfront costs, technical, economic, and regulatory limitations, and the remoteness of sites. |
| Current stage of projects | Most current geothermal projects are still at the proof-of-concept or early demonstration stage. |
| Direct-use technologies | At a more advanced stage of innovation with opportunities to improve project economics and reduce upfront costs. |
| Estimated energy supply | It is estimated that 1% of geothermal energy shallower than 5km and hotter than 150°C could supply Australia's total energy requirements for 26,000 years. |
| Electricity generation | Geothermal energy can be used for electricity generation with temperatures as low as 100°C, and higher temperatures are required for larger-scale production. |
| Direct-use applications | Temperatures of 30°C and above can be used for industry, agriculture, and heating and cooling residential buildings. |
| Geothermal power generation advantages | Small surface footprint, creates ongoing local jobs, and does not require backup power or storage. |
| Cost comparison | Geothermal power, particularly Hot Sedimentary Aquifer (HSA) projects, can be cost-competitive with conventional fossil fuel generation, solar PV, and wind generation when energy storage costs are included. |
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What You'll Learn
Geothermal energy in Australia is a clean, stable energy source
Australia has abundant sunshine and wind, but it also has the potential to harness vast reserves of clean, geothermal energy. This energy source can provide round-the-clock, low-emission, and sustainable power that can help stabilize electricity networks as they integrate increasing amounts of solar PV and wind generation. Geothermal power generation has a small surface footprint, creates local jobs, and does not require backup power or storage.
While Australia has yet to successfully operate a geothermal power plant, there have been several projects exploring this energy source. A Cooper Basin demonstration project by Geodynamics assessed the potential of hot-rock geothermal energy for zero-emission, base-load power. The 1 MWe Habanero pilot plant operated for 160 days in 2013, but the project was ultimately abandoned due to economic and logistical challenges.
Despite these setbacks, the Australian Geothermal Association (AGA) has reported that geothermal energy is already widely used in Australia, particularly for direct-use applications. Direct-use geothermal is a successful and growing industry, with temperatures of 30°C and above used in agriculture, industry, and for heating and cooling buildings. With recent technological advancements, such as fibre-optic sensing and advanced analytics, Australia is working to overcome the barriers to accessing its geothermal potential and develop this clean energy source.
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Geothermal power generation has a small surface footprint
Geothermal energy is stored as heat in the earth, generated by the natural decay of radiogenic elements such as uranium, thorium, and potassium. This heat is continually replenished and will remain available for billions of years, providing an essentially inexhaustible supply of energy. Geothermal resources are reservoirs of hot water that exist at varying temperatures and depths below the earth's surface. Wells can be drilled into these reservoirs to tap steam and very hot water, which can be brought to the surface and used to generate electricity or provide direct heat to buildings.
In Australia, there is considerable potential for geothermal energy to be used for electricity generation and direct-use applications. Exploratory geothermal wells have been drilled, and hot granites detected, but all projects have been abandoned due to economic reasons or problems during commissioning. However, it is estimated that just one per cent of the geothermal energy shallower than five kilometres and hotter than 150°C could supply Australia's total energy requirements for 26,000 years.
The technology for geothermal energy exists, and the potential for a vast supply of energy is there. With aggressive cost reductions in enhanced geothermal systems, there could be up to 90 gigawatts of electricity-generating capacity by 2050. Geothermal power generation's small surface footprint makes it an attractive option for renewable energy sources.
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Geothermal energy can be used for heating and cooling
Geothermal energy is a promising renewable energy source for Australia, with the potential to provide baseload power for homes and industries. This energy is derived from the heat contained within the Earth, generated by the natural decay of radiogenic elements such as uranium, thorium, and potassium over millions of years.
While no geothermal power plants are currently operational in Australia, the country has considerable geothermal energy potential, with two types of geothermal projects in development. Direct use applications, which include heating and cooling, are at a more advanced stage of innovation. Temperatures of 30°C and above can be utilised for heating and cooling in residential buildings, agriculture, and industry. This direct use of geothermal energy is already being utilised in Australia, with several buildings, homes, and swimming pools taking advantage of this renewable energy source for heating and cooling purposes.
Geothermal Australia, for example, offers a range of geothermal products, including drilling, ground source heat pumps, and cooling systems. The company Geodynamics also previously operated a 1 MWe Habanero pilot plant for 160 days in 2013, although the project was eventually abandoned due to economic factors.
The vast deep-seated granite systems in Central Australia, with high temperatures at depth, highlight the potential for geothermal energy in the country. However, drilling technology currently limits the economic development of geothermal resources to a maximum depth of about five kilometres. Despite this, Australia's geothermal energy potential is significant, with estimates suggesting that just one per cent of geothermal energy shallower than five kilometres and hotter than 150°C could meet the country's total energy requirements for 26,000 years.
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Geodynamics' Cooper Basin demonstration project
Geothermal energy is stored as heat in the Earth, generated by the natural decay of radiogenic elements such as uranium, thorium, and potassium over millions of years. It can be used for electricity generation or direct use applications such as heating and cooling. Australia has considerable geothermal energy potential, with vast deep-seated granite systems in Central Australia that have high temperatures at depth.
In 2010, Geodynamics' Cooper Basin demonstration project was the most advanced of 47 identified projects in Australia. The project aimed to assess the potential of hot-rock geothermal energy for zero-emission, base-load power. Geodynamics examined Enhanced Geothermal Systems (EGS), a newer technology that does not rely on volcanic systems but uses hot basement granite rocks to generate electricity. Hot granite rocks in South Australia's Cooper Basin reach temperatures exceeding 280 degrees Celsius.
The Habanero pilot plant operated for 160 days in 2013, achieving small-scale electricity generation. However, the project was ultimately abandoned due to economic unviability. The cost of implementing the technology and delivering electricity to market exceeded the potential revenue stream. Despite this setback, Geodynamics' work in the Cooper Basin demonstrated the feasibility of EGS for geothermal electricity generation in Australia, and the company continues to explore other green energy initiatives.
The Cooper Basin Enhanced Geothermal Systems project also investigated the use of geothermal energy to provide process heat for future natural gas developments in the region. This aligns with the identification by the ARENA International Geothermal Expert Group that the most likely cost-competitive commercial-scale market for geothermal energy in the next decade is for direct heat uses in shale gas processing. While the project faced challenges, it contributed to the exploration of geothermal energy's potential in Australia and the advancement of low-carbon energy technologies.
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Geothermal energy in Australia: high upfront costs
Geothermal energy in Australia has faced challenges due to high upfront costs, hindering its development and utilisation. As of May 2022, no geothermal power plants were operational in the country. The significant upfront capital investment required for geothermal projects has been a deterrent, despite the potential for long-term cost savings and stable energy supply.
Geothermal energy, derived from the Earth's natural heat, offers a clean and consistent energy source for heating, cooling, and electricity generation. Australia possesses considerable geothermal energy potential, with exploratory wells detecting the presence of hot granites at depth, suitable for geothermal energy development. However, the financial burden of establishing geothermal power plants has been a significant obstacle.
One notable example is the Geodynamics Cooper Basin demonstration project, which aimed to assess the viability of hot-rock geothermal energy for zero-emission, base-load power. The project encountered economic challenges due to the high costs of commercialising generation and the remote location of the site. Despite the technology's success, the overall costs of implementing and delivering electricity exceeded the potential revenue, leading to the project's abandonment.
High upfront costs in geothermal energy ventures can be attributed to various factors, including the specialised equipment and infrastructure required for drilling and accessing geothermal heat. Additionally, the technical complexities and economic limitations specific to the Australian context have further contributed to the high initial investments needed for geothermal projects.
However, recent technological advancements offer a glimmer of hope for reducing upfront costs and enhancing the accessibility of geothermal energy. Innovations such as fibre-optic sensing, advanced analytics, and new drilling techniques are playing a pivotal role in exploring new possibilities and driving down expenses. These advancements are crucial in overcoming the financial barriers that have impeded the widespread adoption of geothermal energy in Australia.
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Frequently asked questions
Geothermal energy is found in various parts of Australia, including Queensland and Central Australia.
Geothermal energy has the potential to provide a significant amount of clean, renewable, and stable energy for Australia. It is estimated that one per cent of the geothermal energy shallower than five kilometres and hotter than 150°C could supply Australia's total energy requirements for 26,000 years.
There are several challenges to developing geothermal energy in Australia, including high upfront costs, technical limitations, economic factors, and regulatory issues. Additionally, most potential resources are very remote from markets, and the technical, commercial, and logistical challenges have been underestimated.
Some examples of geothermal projects in Australia include the Cooper Basin demonstration project by Geodynamics, the Habanero pilot plant, and the recently commissioned 310 kW power plant in Winton, Queensland.
