Projects: Shropshire


Technology designer, supplier and operator: Greenfinch Location: Ludlow, Shropshire


The first of its kind in the UK, this plant is designed as an alternative to landfill for biologically municipal waste. South Shropshire District Council has secured funding from the DEFRA New Technology Demonstration Programme and Advantage West Midlands RDA.
It is due to open Spring 2006



The plant accepts source separated kitchen and garden waste, collected from local residents. This is shredded and slurrified on site. The digester has a capacity of 5,000 tonnes/year.
Electricity- 200 kW (reciprocating engine). 7% net of this is used on site. Heat- Amount not yet known, to be exported to neighbouring industrial estate.
A pasteurised biofertiliser will be provided to local farms.
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Greenfinch Aerial View of site during construction (Aug 05), and completed (Oct 05):



Projects: Scotland (Greenfinch)

organic power

These are seven farm based AD facilities in SW Scotland. The equipment was supplied by Greenfinch.The digesters were procured and are owned by the Scottish Executive.

The farm locations are as follows:

  • New Farm (with electricity generation), The Ryes and Castle Farm; Southwick, Dumfries, Scotland
  • Corsock Farm; Dalbeattie, Scotland
  • Sorbie, Knockrivoch and Meikle Laught Farms; Saltcoats, Ayrshire, Scotland


Each of these dairy farms has its own digester and gas collection equipment. They were installed in 2004 in order to provide research into solutions to water pollution problems from farm run off, and a source of useful by-products for the farmers. They were procured, and are owned by the Scottish Executive.


Cattle slurry/ manure from the farm, no material is imported.


Heat- The biogas produced is used to generate heat for the houses and other farm buildings. Electricity- At New Farm, a 15kW electricity generator is installed, to provide power for farm use (not grid connected). Digestate- Liquid fertilisers, can be spread back on the grazing land

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Greenfinch New Farm anaerobic digestion system, with power generation:


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Projects: Holsworthy


Holsworthy Biogas Plant

Submitted: 18 November 2005 Operator: Summerleaze Location: Dobbles Lane Ind Estate, Holsworthy, Devon. EX22 7HH
This is a centralised AD facility. The plant is designed to achieve several goals- nutrient management for local farmers, waste management for local industries, local employment, low cost heating for the town and renewable electricity production for the grid.
Originally a community project, Summerleaze took over in March 2005 and has invested in upgrades, including an additional storage tank, new offices, improvements to the gas system and new odour control.
Planned improvements include new gas and digestate storage facilities, delivery handling facilities, upgrades to existing storage tanks, a steam injection heating system and improvements to on site monitoring facilities.
Include cattle slurry, abattoir waste and food processing waste. The operators are also experimenting with energy crops such as maize. Processing capacity is up to 140,000 tonnes/ year. The plant currently takes around 80,000 tonnes/ year. Required energy input: 200kW electrical, 1MW heat.
Installed electrical capacity: 2.1MW, with current average of 1.2MW. Heat: 1.5MW Digestate will be offered to local farms.
With the upgrades complete, 2.5 MW power and 3MW heat are planned.
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“Summerleaze An-digestion”


Operator: Summerleaze Location: Cambridge Research Park, Cambridge, CB5 9PG

This is a small 300m 3 digester, used for research and testing purposes. Summerleaze are currently studying the biogas potential of energy crops, with a view to using dairy and abattoir wastes in future.
The scale of this plant makes it possible to carefully control the system parameters and feeding rates to get accurate figures for gas production and biological activity. Once CHP is installed on the site the electricity will be used to generate renewable Hydrogen from an on-site electrolysis unit.
Summerleaze An-digestion

Bioplex Demo Plant

Operator: Bioplex Ltd Location: Longstock, Hampshire

This is a commercial demonstration plant for Bioplex’s “Portagester” technology, which combines a mobile pasteurisation and digestion unit with a conventional AD unit. This is a modular system which can be scaled according to requirements.

This “2nd generation process” uses pasteurisation and separation and can readily take liquids or solids, even with limited amounts of plastics. The cost per tonne treated is comparable to landfill disposal, with benefits of renewable energy and natural fertiliser production.

A “3rd generation process”, under development