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The Edinburgh Geobattery project

Waste supercomputer heat and old mines could warm homes
Katie Hill - Editor-in-Chief, My Green Pod
National Mining Museum_Credit Neil Hanna

Main image: National Mining Museum, credit Neil Hanna

A first-of-its-kind system in the UK is being trialled in Edinburgh to see if waste heat from a large computing facility can be stored in disused mine workings and used to warm homes.

The energy required to power the University of Edinburgh’s Advanced Computing Facility (ACF) could be recycled to heat at least 5,000 households in Scotland’s capital.

Harnessing excess heat

The facility, home to the national supercomputer and used for research such as national climate modelling and health data modelling, currently releases up to 70GWh of excess heat per year.

This is projected to rise to 272GWh once the UK government’s recently announced next-generation Exascale supercomputer is installed at the University.

The £2.6 million feasibility study will examine how the water in old mine workings near the computing facility could be harnessed to heat people’s homes.

The process of cooling the supercomputers would be augmented to transfer the captured heat into the mine water – up to a maximum temperature of 40°C – which would then be transported by natural ground water flow in the mine workings, and made available to warm people’s homes via heat pump technology.

‘This project opens up the potential for extracting heat stored in mine water more broadly. Most disused coal mines are flooded with water, making them ideal heat sources for heat pumps. With more than 800,000 households in Scotland in fuel poverty, bringing energy costs down in a sustainable way is critical, and using waste heat could be a game-changer.’

PROFESSOR CHRISTOPHER MCDERMOTT
Lead academic on the project, from the University of Edinburgh’s School of Geosciences

A global blueprint

If successful, the study could provide a global blueprint for converting abandoned flooded coal, shale and mineral mine networks into underground heat storage.

With a quarter of UK homes sitting above former mines, potentially seven million households could have their heating needs met this way, researchers say.

‘The University’s own climate and sustainability targets mean that we need to look at a wide range of ways to address the challenges of the climate crisis. This project brings together these commitments alongside our own innovative research to find solutions to tackle climate change that deliver direct benefits to people and influence positive change locally and globally.’

PROFESSOR SIR PETER MATHIESON
Principal and vice-chancellor of the University of Edinburgh

Industry and academia

The Edinburgh Geobattery project – led by Edinburgh-based geothermal company TownRock Energy – is being spearheaded by industry and academic partners from Scotland, the US and Ireland.

The University of Edinburgh is the lead research partner on the project and is providing £500k of funding as part of its own net zero objectives.

Scottish Enterprise has awarded a £1m grant to the project through the Joint Programming Platform Smart Energy Systems (JPP SES) and Geothermica – two networks that have co-funded projects developing innovative heat and cooling solutions.

A further $1m from the US Department of Energy will fund researchers from the Idaho National Laboratory and Lawrence Berkeley National Laboratory.

University College Dublin, whose researchers are funded by Geothermica and the Geological Survey Ireland, and the University of Strathclyde are also project partners.

Edinburgh Innovations, the University of Edinburgh’s commercialisation service, will help make the research findings an investable proposition and support further funding applications.

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