Home » Soil’s got the juice with firm’s bacteria-powered batteries

Soil’s got the juice with firm’s bacteria-powered batteries

by Mark Cantrell
Dr Ben Metcalfe, Dr Jakub Dziegielowski, and professor Mirella Di Lorenzo from university spin-put, Bactery

It sounds a little far-fetched, maybe, but a start-up company in Bath is working on a new kind of battery that uses bacteria to harvest electricity from soil.

Bactery – a spin-out company from Bath University – has developed bacteria-powered batteries that harvest green energy from the soil by taking advantage of the natural processes that occur in microorganisms living within it.

Currently, the company is focusing its research on assisting farmers, but the technology undoubtedly has potential application in other sectors of the economy and society.

The company’s chief executive, Dr Jakub Dziegielowski, who undertook a PhD in chemical engineering at the university before setting up the company, said: “Our initial goal is to leverage the unique Bactery technology to accelerate the shift toward digitalisation within the agriculture sector.”

As precision agriculture continues to demonstrate its effectiveness in boosting yields and conserving resources, the demand for sensors and Internet of Things (IoT) devices continues to rise. These electronics collect and relay data on the state of the fields, empowering farmers to make well-informed decisions.

However, current ‘on-farm’ power delivery methods, such as obstructive cabling, single-use chemical batteries, and weather-dependent solar panels largely restrict deployment of Agri-data solutions.

Recognising this, Bactery says it will offer a more practical, affordable, and reliable means of powering these electronics, through soil itself.

The technology has a useable lifespan of over 25 years, and an anticipated cost of around £25 per unit with no maintenance expenses, with the company promising ‘install and forget’ functionality.

Bactery’s technology builds on Soil Microbial Fuel Cells (SMFCs), which harness energy from the metabolic activity of specific microorganisms known as electrigens, naturally present in soil.

Electrigens have the unique ability to generate electrons during the consumption of organic compounds. These electrons are ‘grabbed’ by the SMFCs and are forced to travel through an external circuit, producing electricity.

The team proved the concept in 2019, by building a soil-powered water disinfection system for decentralised communities. The prototype was tested in Icapuí, a fishing village in a remote semi-arid part of North-East Brazil, where the main source of drinking water is rainwater and access to a reliable power network is scarce.

Grounded design

Since then, the company has developed a way to effectively scale and sustain electricity generation. They achieved this using innovative designs and custom energy harvesting strategies, tailored to the biological processes in the ground.

The firm will spend the upcoming 12 months refining their prototypes before advancing towards small-scale production. Ahead of the 2026 product launch, the team is inviting potential collaborators and investors in relevant fields to get in touch.

Bactery’s directors also include chemical engineer, professor Mirella Di Lorenzo, and electronic engineer Dr Ben Metcalfe. Both are based in Bath University’s Faculty of Engineering & Design, and are deputy directors of CBio, the Centre for Bioengineering & Biomedical Technologies.

Lorenzo said: “Farmers are increasingly valuing the importance of data to make informed decisions towards resource-efficient agricultural practises. We are removing the barrier to generating that data by creating a sustainable way to power sensors, and making them always-on, cheap, low-maintenance and low-impact.”

Metcalfe said: “This is a powerful illustration of how our Bactery technology could be used, but this is just the first application of what we believe is a great method of generating clean energy in an innovative, sustainable way.”

Dziegielowski added: “Bringing our product to this stage and putting theory into practice through several years of research has been a challenging, yet incredibly rewarding experience. It wouldn’t have been possible without our great team and the support of many others along the way.

“I am excited to see the company make a positive difference in agriculture, and in other sectors. We look forward to sharing more about the upcoming advancements of Bactery technology and future applications in the near future.”

Main image: Dr Ben Metcalfe, Dr Jakub Dziegielowski, and professor Mirella Di Lorenzo from university spin-put, Bactery

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