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Farmers are converting cow faeces into power by using cow pat batteries.

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A kilograms of cow faeces can generate enough electricity to power a vacuum cleaner for five hours, therefore Arla's herd of 460,000 could power 1.2 million UK households.

A group of British farmers is converting cow poop into cow POWER in the shape of AA-sized "patteries."

Because 1kg of cow poo can produce 3.75 kwh of electricity, the rechargeable "patteries" could be an element of Britain's renewable energy answer.

This is enough energy to run a vacuum cleaner for five hours or iron for 3.5 hours.

The dairy cooperative Arla, which developed the batteries with battery expert GP Batteries, claims that the energy generated by a single cow's excrement could power three families for a year.

As a result, its 460,000-strong herd could power an "utterly incredible" 1.2 million UK homes.

Having a steady and stable source of power, such as cow slurry – which Arla produces more than 1 million tones of annually – could open up new possibilities for powering homes and transportation.

Anaerobic digestion is used to convert the slurry into energy.

"There is so much promise for innovations like anaerobic digestion to contribute to the UK's renewable energy needs while reducing farm emissions with something readily available on our farms – poo," said Arla farmer Neil Ridgway.

"We already use the energy created by cow slurry to power our entire estate on my farm, but this could go so much further."

"We can even use the by-product of the process as a natural fertiliser on our property, closing the loop – it's a win-win situation."

Organic materials, such as animal waste, is broken down during the anaerobic digestion process to produce biogas and bio-fertilizer.

This process occurs in the absence of oxygen in an anaerobic digester, which is a sealed, oxygen-free tank — the final result is biogas.

After cleaning, the biogas is sent to a Combined Heat and Power (CHP) plant, where it is used to generate sustainable energy.

The ultimate result is a nutrient-rich, low-emission natural fertilizer that may be applied to the ground to help nourish it.

"Arla is committed to sustainable farming and decreasing emissions from food production," said Graham Wilkinson, group agriculture director at Arla.

"Our farmers are continuously looking for new ways to solve problems, and after our poo-powered transportation trials last year, it's evident we've only scratched the surface."

"Arla farms are home to approximately 460,000 cows, which produce a consistent flow of slurry – of poo – that may be converted into power, which has the potential to make a significant contribution to Britain's renewable energy quota."

"A few of our farmer-owners are already converting cow poop into energy."

"If the government and the energy industry understand the possibilities, scaling up cow power might be a game-changer for the UK's renewable energy source while simultaneously helping to cut emissions in agriculture."