Trailblazing farms to trial manure slurry as an alternative green fuel

If successful, the programme could be rolled out to hundreds of small-scale farms across Cornwall

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Cornwall Council is combining ambitious plans to introduce renewable fuel sources for its vehicle fleet with a ground-breaking scheme to boost the future of farming and create more green jobs for residents. 

Together with Cormac, which looks after its fleet, the authority has joined forces with six of its Cornwall Council Farms estate-owned dairy farms and a Cornish technology company to trial the production of an alternative green fuel made from manure slurry in a pilot scheme believed to be the first of its type in the world.

If successful, the programme could be rolled out to hundreds of small-scale farms across Cornwall and create significant opportunities for farmers to diversify their income streams, save on operating costs, join the green economy and contribute to helping fight climate change.

The move also signals the start of the Council’s transition to running a low emission fleet and investment in world-leading sustainable agricultural technology to create more green jobs for residents and boost Cornwall’s economic recovery from the pandemic.  

Over the last two years Newquay-based clean energy company Bennamann Ltd has been testing a patent-pending engineering method to turn farm waste – such as cow manure and grass cuttings – into biomethane, for use as a vehicle fuel.

Its pioneering work has been supported by the Cornwall and Isles of Scilly Growth Programme’s Energy Independent Farm project, which is financed by the European Regional Development Fund and led by Bennamann in partnership with the University of Exeter and Chynoweth Farm Partners.  

Having already started trialling its processed biomethane in a tractor and Cormac’s fleet of tarmac hot boxes, Bennamann’s gas capture technology will now be expanded in sealed slurry lagoons on six Council-owned dairy farms located across Cornwall. 

The £1.58m Council-funded pilot will see Bennamann collect and upgrade the biogas produced at the farms before delivering it to Cormac to fuel a fleet of 77 converted road maintenance trucks. 

Farms taking part in the programme can sell the captured biomethane and develop a new revenue stream.

The new programme is part of the Council’s climate change action plan to help Cornwall become carbon neutral by 2030.  It will also aid Cornwall’s Covid economic recovery in paving the way for more skilled jobs in the clean energy and environmental sectors. 

Along with a new electric bikes scheme for Council staff, over the coming months the Council will also be introducing a new fleet of electric pool cars, as well as piloting electric vans and Fire Service vehicles. 

Edwina Hannaford, Cornwall’s cabinet member for climate change and neighbourhoods, said: 

“As we work on tackling the climate emergency and our Covid recovery this zero-carbon pilot will not only transform our Cormac fleet and cut emissions, it brings investment to our farms and our agricultural and technological sector in Cornwall to create long-term, quality jobs in the green economy. 

Biomethane could play an important role in helping Cornwall become carbon neutral by 2030 and this new technology developed by an innovative Cornish company will allow small scale farmers to join the growing biomethane market for the first time.” 

Deputy Leader Adam Paynter whose portfolio covers Cornwall Council Farms Estate said:

“This capital investment in first of-a-kind, covered slurry lagoons can provide a commercial return for farmers and enable a rollout across all dairy farms in Cornwall, nationally and potentially globally.  

Farmers will also benefit from better slurry storage and use, savings on fertiliser and electricity bills.” 

Chris Mann, Bennamann co-founder and chief executive, said:

“Bennamann is passionate about delivering a local clean energy revolution that brings commercially viable, sustainable production and distribution of small-scale farm biomethane sourcing to the marketplace. And this ground-breaking pilot represents a significant milestone in achieving that ambition. We are proud to be a Cornish company that has the potential to radically change the global energy market and look forward to delivering a successful pilot that will put Cornwall at the forefront of pioneering renewable energy innovation, as well as help the Council achieve its zero carbon goals and post pandemic recovery plans.”  


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