From Waste to Wattage


Cenin are delighted to have agreed with Agrivert to have their Anaerobic Digestion plant based at Parc Stormy. Agrivert have several AD plants in England, but this is the first AD plant of its type in Wales, allowing local food waste to go back into a circular economy here in Wales.

The plant was opened by The First Minister of Wales, Carwyn Jones, on the 2nd December 2016.

The facility takes in organic wastes such as food waste and surplus crops from the local communities and farms and turns them into biogas to power a 3.2MW electricity generator. Organic waste like this used to just go to landfill where it would break down and release harmful greenhouse gases. Instead, bacteria in the AD tanks break down the food waste producing a useful captured gas, leaving an organic digestate liquid behind that is a valuable organic agricultural fertiliser. AD is a very reliable renewable energy source because it is not weather dependent, therefore the generator produces a constant 3.2MW of electricity 24 hours a day, 365 days of the year, enough to power 5900 homes.

The generator has a large air cooling system. Instead of just releasing all that heat into the sky, Agrivert will supply their waste heat to Cenin Cement’s drying building next door to be used in the low-carbon cement’s drying process.

The organic digestate fertiliser will be piped to our neighbour’s farm that adjoins the site so they can grow crops and complete the circular economy. It also replaces their fossil fuel based fertilizers and allows them to make vital economic savings.

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The Anaerobic Digestion facility treats source segregated food waste from local authorities and commercial waste producers. Food waste is depackaged, macerated and then digested anaerobically in large sealed tanks.


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During the digestion process food waste breaks down to produce biogas (methane and carbon dioxide) and a liquid fertiliser called digestate. The biogas is converted to renewable electricity in gas engines and is fed to the National Grid. The digestate, a valuable organic fertiliser is spread on local farm land, reducing the use of fossil fuel-derived chemical fertilisers.


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Excess heat produced in the process is used in the cement production process of the Cenin plant situated next to the AD facility.

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CASE STUDY Key Facts

• Construction time: 9 months

• Commissioned: September 2016

• Achieved 90% power: November 2016

• Design power output: 3MWe (2 x Jenbacher 420 engines)

• Facility footprint: 2.8 hectares

• Waste input: solid, liquid, packaged and unpackaged food waste

• Digestion retention time: circa 75 days

• ABPR certified

• PAS110 approved process

• Digesters: 4 x 5,800m3 tanks

• Digestate storage: 1 x 5,800m3 tank and 20,000m3 off-site lagoon

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