A life-cycle analysis of deep enhanced geothermal systems-The case studies of Reykjanes, Iceland and Vendenheim, France

RENEWABLE ENERGY

卷:177

Article

Sigurjonsson, Hafpor Aegir¹  Cook, David²  Daviosdottir, Brynhildur¹  Bogason, Sigurour G.³ 

[1] Univ Iceland, Sch Engn & Nat Sci, Environm & Nat Resources, Saemundargotu 2, IS-102 Reykjavik, Iceland

[2] Univ Iceland, Sch Social Sci, Environm & Nat Resources, Saemundargotu 2, IS-102 Reykjavik, Iceland

[3] Geothermal Res Cluster GEORG, Grensasvegur 9, IS-108 Reykjavik, Iceland

关键词: Life-cycle assessment;    Deep geothermal energy;    Environmental impacts;    Hotspots;    Greenhouse gas emissions;   

DOI  :  10.1016/j.renene.2021.06.013

来源: Elsevier

【 摘 要 】

The climate impacts of deep enhanced geothermal systems (EGS) have been understudied in the aca-demic literature. Using life-cycle analysis (LCA) conducted in accordance with ISO 14040 and ISO 14044 standards, this paper explores the climate change impacts of two deep EGS. The first study was in Reykjanes, Iceland, where a single well, IDDP-2/DEEPEGS, was drilled to a depth of 4.6 km for the pur -poses of additional electricity production from an existing power plant. The second study involved two wells with side-tracks (depth > 5000 m), drilled to serve a new heat and power co-generation plant located on an old oil field site in Vendenheim, France. Climate change impacts for the sites were esti-mated in the range 1.6-17.4 gCO2e/kWh and 6.9-13.9 gCO2e/kWh for Reykjanes and Vendenheim, respectively. Although the EGS projects are very different, both outcomes are low when compared to non-renewable alternatives and akin to best-in-class renewable alternatives. The main impact at the Reykjanes demonstration site were the greenhouse gas emissions released from the borehole, an effect that could be avoided by carbon capture and storage/mineralisation/utilisat ion. In the case of Ven-denheim, further reductions in emissions could be achieved via more extensive adoption of circular economy principles in design and procurement. (c) 2021 Elsevier Ltd. All rights reserved.

【 授权许可】

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