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Thermal storage system provides a clean energy future

Elizabeth Gracie

Thermal energy storage tower in Bozen-Bolzano, South Tyrol, Italy - Bartleby08 - Own work


The University of South Australia’s Future Industry Institute (FII) has begun prototyping a commercial-scale system that stores renewable electricity as heat which can then be released on demand for industrial applications. 


The project is backed by both the Australian Renewable Energy Agency (ARENA) and the new Reliable Affordable Clean Energy for 2030 Cooperative Research Centre (Race for 2030 CRC) and hopes to provide an alternative to traditional fossil fuel-fired heat. 


FII researcher, Dr Rhys Jacob said that innovations in this area will prepare Australia for a future where the role of gas has shrunk to a significant degree. 


“This research is looking at how we use low-cost variable renewables to offset what is traditionally fossil fuel-fired heat, and the recent progress has been excellent,” said Jacob. 


“Our research shows that used in conjunction with renewables such as solar and wind, this system could reduce gas consumption by as much as 80 per cent in some industries.” 


Innovations in this area could also be commercially viable much sooner than once thought. 


According to Dr Jacob, the first stage of testing for the thermal storage system is set to begin in early 2021, with an initial design that delivers heat in the range of 200 - 700 degrees celsius, with the scope to increase to a temperature output of over 1000 degrees celsius in the near future.


Each individual unit will also be self-contained and stackable, delivering between 850 - 1000 KWh of thermal storage capacity each. 


“These will essentially be like a 10-foot shipping container, and the end-user will be able to roll them out as modules, much the same as they do with batteries- you have the one design, and then however much storage you need, you add them up together,” said Dr Jacob. 


And whilst FF’s research suggests that their thermal storage system won’t replace gas entirely in the near future, it does have the potential to reduce its use between 60 and 80 per cent, depending on its application.


“You still need to have the option of fuel as a backup for when renewable output is low because, from the data we have run if you want to use purely renewables and storage, you would require a huge amount of storage just to cover the extreme situations,” said Dr Jacob. 


“So, we’ve developed a hybrid approach, where our system can deliver 60, 70 and 80 per cent of heat needs using renewables and storage, then the small shortfall will be covered by a fuel, which could be an existing gas system or renewable fuels like hydrogen or biogas”. 


According to the FII, similar trials using this hybrid approach have already been conducted across Europe and will likely begin in Australia soon, something that Dr Jacobs feels elevates the general global desire to embrace greater renewable use, for a cleaner environment and stronger economies. 


“We’ve had conversations with a number of interested parties about how we can use our technology to provide process heat, and the advantage of these hybrid approaches, from industry’s point of view, is that they leverage existing fossil fuel infrastructure but make the overall system more cost-effective and energy-efficient,” said Dr Jacob. 


“So, a small amount of high value can be used on-demand when required, but abundant, cheap and clean energy can do the grunt work”. 

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