Boil ‘em, mash ‘em, stick ‘em in a stew. Potatoes, as a hungry hobbit once noted, are incredibly versatile. Now, in the north of England at least, they are being used as a source of energy.
The 2 Sisters Food Group—one of the UK’s biggest food manufacturers—just opened a new bio-refinery at its food processing plant in Carlisle. The facility is powered by potato waste from the facility’s pie and mashed potato manufacturing lines.
The plant won’t be short of resources. The humble potato is used in roughly 10.14 billion meals every year, according to AHDB Potatoes, a division of the UK’s Agriculture and Horticulture Development Board.
“The reason we went for Carlisle was purely because it had a consistent waste stream that was easily manageable,” Andrew Edlin, group sustainability director for 2 Sisters Food Group, said in a phone interview. Edlin went on to describe the bio-refinery as a “next-generation anaerobic digester.”
Edlin explained that the Carlisle plant makes around 80 million ready meals every year, with potato-topped dishes—from shepherd’s to Cumberland pies—its primary products.
According to a release, the bio-refinery will generate 3,500 megawatt hours (MWh) per year in electricity and a further 5,000 MWh per year in steam.
The plant’s launch is part of an overall sustainability plan that 2 Sisters hopes will add up to 35,000 metric tons of carbon savings annually, helping to cut its carbon footprint by 20 percent come 2018.
As well as helping to save carbon dioxide emissions, Edlin said that the plant had other benefits, including the potential to produce over 5,000 gallons of water that could be used in the plant.
The choice of potatoes as a power source might seem strange to some, but it’s not the first time food and drink have been used to produce energy.
Earlier this year, CNBC spoke to Celtic Renewables and Bio-Bean, two UK companies using the by-products of whiskey and coffee, respectively, to create energy.
For Edlin, plans are afoot for similar plants at the company’s other sites. “We have committed to look at all 40 of our factories to see where it’s viable,” he said. “We currently have identified 10 (where) we think it is.”
Source: CNBC