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The energy return on investment of BECCS: is BECCS a threat to energy security?

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Title: The energy return on investment of BECCS: is BECCS a threat to energy security?
Authors: Fajardy, M
Mac Dowell, N
Item Type: Journal Article
Abstract: Compliance with long term climate targets whilst maintaining energy security is understood to rely heavily on the large-scale deployment of negative emissions technologies (NETs). One option, Bioenergy with Carbon Capture and Storage (BECCS) is prominent in Integrated Assessment Models (IAMs), with projected annual contributions of 8 – 16.5 Gt CO 2 /yr of atmospheric carbon dioxide removal whilst contributing 150 – 300 EJ/yr, or 14 to 20% of global primary energy supply, in 2100. Implicit in these scenarios is the assumption that BECCS is a net producer of energy. However, relatively energy intensive biomass supply chains and low power generation efficiency could challenge this ubiquitous assumption. Deploying an energy negative technology at this scale could thus represent a threat to energy security. In this contribution, we evaluate the energy return on investment (EROI) of an archetypal BECCS facility. In order to highlight the importance of biomass sourcing, two feedstock scenarios are considered: use of domestic biomass pellets (UK) and import of biomass pellets from Louisiana, USA. We use the Modelling and Optimisation of Negative Emissions Technologies (MONET) framework to explicitly account for growing, pre- treating, transporting and converting the feedstock in a 500 MW BECCS facility. As an example, we illustrate how the net electricity balance (NE l B) of a UK-based BECCS facility can be either positive or negative, as a function of supply chain decisions. Power plant efficiency, fuel efficiency for transport, transport distance, moisture content, drying method, as well as yield were identified as key factors that need to be carefully managed to maximise BECCS net electricity balance. A key insight of this contribution is that, given an annual carbon removal target, increasing BECCS’ power generation efficiency by using a more advanced biomass conversion and CO 2 capture technology could improve BECCS net electricity balance, but at the cost of increasing the amount of BECCS capacity required to meet this target. BECCS optimal deployment pathway is thus heavily dependent on which service provided by BECCS is most valued: carbon dioxide removal or power generation.
Issue Date: 1-Jun-2018
Date of Acceptance: 9-Feb-2018
URI: http://hdl.handle.net/10044/1/57243
DOI: https://dx.doi.org/10.1039/c7ee03610h
ISSN: 1754-5692
Publisher: Royal Society of Chemistry
Start Page: 1581
End Page: 1594
Journal / Book Title: Energy and Environmental Science
Volume: 11
Copyright Statement: © The Royal Society of Chemistry 2018. This article is licensed under a Creative Commons Attribution 3.0 Unported Licence (https://creativecommons.org/licenses/by/3.0/)
Sponsor/Funder: Natural Environment Research Council (NERC)
Funder's Grant Number: NE/P019900/1
Keywords: Science & Technology
Physical Sciences
Technology
Life Sciences & Biomedicine
Chemistry, Multidisciplinary
Energy & Fuels
Engineering, Chemical
Environmental Sciences
Chemistry
Engineering
Environmental Sciences & Ecology
NEGATIVE EMISSIONS
CARBON-DIOXIDE
BIOMASS PRODUCTION
AIR CAPTURE
BIO-ENERGY
EROI
REQUIREMENTS
FEASIBILITY
MISCANTHUS
SOCIETY
MD Multidisciplinary
Energy
Publication Status: Published
Online Publication Date: 2018-04-26
Appears in Collections:Centre for Environmental Policy
Faculty of Natural Sciences



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