How certain are greenhouse gas reductions from bioenergy? Life cycle assessment and uncertainty analysis of wood pellet-to-electricity supply chains from forest residues


Climate change and energy policies often encourage bioenergy as a sustainable greenhouse gas (GHG) reduction option. Recent research has raised concerns about the climate change impacts of bioenergy as heterogeneous pathways of producing and converting biomass, indirect impacts, uncertainties within the bioenergy supply chains and evaluation methods generate large variation in emission profiles. This research examines the combustion of wood pellets from forest residues to generate electricity and considers uncertainties related to GHG emissions arising at different points within the supply chain. Different supply chain pathways were investigated by using life cycle assessment (LCA) to analyse the emissions and sensitivity analysis was used to identify the most significant factors influencing the overall GHG balance. The calculations showed in the best case results in GHG reductions of 83% compared to coal-fired electricity generation. When parameters such as different drying fuels, storage emission, dry matter losses and feedstock market changes were included the bioenergy emission profiles showed strong variation with up to 73% higher GHG emissions compared to coal. The impact of methane emissions during storage has shown to be particularly significant regarding uncertainty and increases in emissions. Investigation and management of losses and emissions during storage is therefore key to ensuring significant GHG reductions from biomass.

Publication DOI:
Divisions: College of Engineering & Physical Sciences
College of Engineering & Physical Sciences > Energy and Bioproducts Research Institute (EBRI)
Funding Information: This paper is a contribution to the SUPERGEN Bioenergy Hub funded by the Engineering and Physical Sciences Research Council (EPSRC). Grant Ref: EP/J017302/1 . The authors are grateful for the funding from the EPSRC. They also want to thank Drax Group Plc.
Additional Information: © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (
Uncontrolled Keywords: Emission uncertainty,Forest residues,Greenhouse gas emissions,Life cycle assessment,Storage emissions,Wood pellets,Forestry,Renewable Energy, Sustainability and the Environment,Agronomy and Crop Science,Waste Management and Disposal
Publication ISSN: 1873-2909
Last Modified: 01 Apr 2024 07:30
Date Deposited: 11 Feb 2019 10:52
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
https://www.sci ... 1166?via%3Dihub (Publisher URL)
PURE Output Type: Article
Published Date: 2015-08-01
Authors: Röder, Mirjam (ORCID Profile 0000-0002-8021-3078)
Whittaker, Carly
Thornley, Patricia (ORCID Profile 0000-0003-0783-2179)



Version: Published Version

License: Creative Commons Attribution

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