In 2010, Cannock used anaerobic digestion to process 120,000 tonnes of food waste; the result generated renewable electricity and exported surplus power to the grid

Food waste that might otherwise have been sent to landfill became the raw material for renewable energy at Biffa’s Poplars Anaerobic Digestion plant in Cannock, West Midlands. Developed at a cost of £24 million, the facility was designed to handle more than 120,000 tonnes of food waste each year while producing biogas that could be converted into electricity.

The project grew from a practical problem facing waste operators: large volumes of commercial and industrial food waste were being discarded even though the organic material still contained usable energy. Biffa, which had long operated the landfill site, proposed building an anaerobic digestion facility that could bring waste collection, preparation and treatment together at the same location.

Construction of the Poplars facility reflected a wider shift in how the UK was approaching organic waste. Rather than treating food waste solely as something that needed disposal, the planned system used it as a feedstock for energy production. Waste from businesses including Sainsbury’s and Bakkavor was among the material intended for treatment at the plant.

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Anaerobic digestion uses microorganisms to break down organic material in an environment without oxygen. As food waste decomposes, it produces biogas, a mixture made largely of methane and carbon dioxide. The methane can then be used as a fuel rather than allowing the energy contained in the waste to go unused.

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At Poplars, food and organic waste was delivered into an enclosed warehouse where it could be sorted and prepared before entering the digestion process. This enclosed approach was important because the material came from commercial and industrial sources and needed controlled handling before it could be processed.

The resulting biogas could be supplied to combined heat and power equipment. CHP systems generate electricity from a fuel source while also capturing useful heat that would otherwise be lost during power generation. Edina supplied and installed the biogas CHP equipment at the Cannock facility, linking the waste-treatment process with on-site energy generation.

Why was Cannock handling so much food waste?

The scale of the facility was one of its defining features. With a capacity of more than 120,000 tonnes of food waste annually, Poplars was described by Edina as Europe’s largest waste-processing plant of its kind at the time. That capacity placed the project on a very different scale from smaller systems serving individual farms, businesses or communities.

Commercial food waste also presents a particular challenge because it is produced continuously and often contains a mixture of organic materials. A dedicated treatment plant can receive those materials in large quantities, separate unsuitable material and direct the organic fraction into a controlled digestion process.

The location at an existing landfill site also gave the project a practical connection to Biffa’s established waste operations. Instead of viewing the landfill only as the final destination for discarded material, the company developed infrastructure that could recover value from part of the waste stream before disposal became necessary.

What happened to the renewable electricity?

The biogas generated by digestion was used to produce renewable electricity through CHP technology. Electricity could supply the facility itself, while surplus power could be exported to the grid, allowing energy recovered from discarded food to become part of the wider electricity system.

That changes the role of food waste within the waste-management chain. The material arrives as something businesses need to get rid of, but its organic content can support another process that produces energy. The result is a system in which waste treatment and power generation operate as connected parts of the same operation.

The approach also illustrates why the value of anaerobic digestion is not limited to the electricity produced. The technology provides a controlled route for processing biodegradable waste while recovering energy from material that would otherwise have little use once discarded.

What made the Poplars project different from a landfill?

Landfill and anaerobic digestion treat waste in fundamentally different ways. Landfill is primarily a disposal method, while anaerobic digestion is designed to break down organic material under controlled conditions and capture the biogas created during that process.

Biffa’s proposal therefore represented a change in how an established waste site could be used. The company was not simply creating another destination for discarded food; it was building a facility around the idea that organic waste could become a resource.

The £24 million investment reflected that shift in infrastructure. It required an enclosed receiving and sorting operation, digestion facilities and equipment capable of converting the resulting biogas into useful energy. Edina’s CHP installation formed an important part of that energy-recovery stage.

Could food waste become an energy resource?

The Cannock facility shows how the energy potential of organic waste can be incorporated into large-scale waste management. Its planned capacity of more than 120,000 tonnes a year meant that the concept was applied to an industrial stream rather than a small experimental operation.

There is also a useful lesson in the way the project was structured. The waste did not need to travel through separate systems for collection, preparation, digestion and energy recovery; the Poplars site was designed to bring those stages together. That integration made the facility both a waste-processing operation and an energy-producing site.

The broader significance lies in the change in perspective. Food waste is usually associated with disposal, but the Cannock project demonstrated that it can also contain recoverable energy. By processing more than 120,000 tonnes a year and using biogas CHP to generate electricity, Poplars connected two problems—organic waste and energy demand—within one industrial system.