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Our energy, our future

Anaerobic Digestion

Anaerobic digestion is a series of processes in which microorganisms break down biodegradable material in the absence of oxygen. It is used for industrial or domestic purposes to manage waste and/or to release energy.

AD is used as part of the process to treat biodegradable waste and sewage sludge.  As part of an integrated waste management system, anaerobic digestion reduces the emission of landfill gas into the atmosphere. Anaerobic digesters can also be fed with purpose-grown energy crops, such as maize.

WREN is assessing the scale of available feedstock, and working with commercial partners to provide AD to process locally collected food-waste to generate heat and power.  We are also looking at a related process, which can loosely be termed Thermophilic Digestion, with the aim of converting food waste to a direct fuel for a biomass boiler. Biomethane injection is subject to an RHI payment of 7.3p/kWh, and electricity generated from AD attracts the following FIT rates:

Tariff Band
( kW capacity )
Current Tariffs
Proposed Tariffs
From April 2014
AD Under 250 15.57 p 12.13 p
  250-500 14.4 p 11.22 p
  500-5000 9.49 p 9.24 p


WREN has undertaken a feasibility study to find out whether we as a town could create heat and power (eg for one of the schools or the Sports Centre) from the food we currently throw away.  We concluded that two issues make this less than viable at the moment - firstly the need for a guaranteed level of feedstock, and secondly the economies of scale that dictate a need to process upwards of 10,000 tonnes/yr in order to be cost effective.
Click here to download more information about AD


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Hamilton House
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