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Mott Macdonald

Steven’s Croft Biomass Power Station

Project description

The UK’s largest wood-fired biomass station, located in Lockerbie, Scotland. It produces 44 MW of clean electricity, enough to power 70,000 homes.

Mott MacDonald’s role

Complete project management services from design through to construction supervision and commissioning of the plant.

Other parties

Client: E.ON UK



Start/finish dates

November 2005 - December 2007


The plant, which is fuelled entirely by biomass material, is carbon neutral, as the amount of CO2 released is the same as that absorbed by the plants when growing.

Interesting facts

■ The power station is based around a bubbling fluidised bed boiler and a condensing steam turbine generator and displaces 140,000 tonnes of greenhouse gases per year.
■ It is making an important contribution to supporting forestry and sawmilling operations in the area, as well as presenting a unique opportunity to the farming community. An independent report predicted that over 300 indirect jobs will be retained in forestry and farming as a result of the development.
■ About 800 hectares of forest and 4000 hectares of short rotation coppice land is required to provide this amount of biomass material. All fuel is locally sourced and the power station location was chosen due to its proximity to the most densely forested area within the UK.
■ The project won the ‘Best Renewable Project Award’ at the Scottish Green Energy Awards 2007.

Over 480,000 tonnes of fuel is needed to power the station every year. The fuel comprises:

Sawmill co-products and small roundwood

Short rotation coppice (willow)

Recycled fibre (from wood product manufacture)

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