従来型から持続可能な発電への移行における再生可能水素・バイオエネルギーのライフサイクル評価
Life cycle assessment of renewable hydrogen and bioenergy pathways transitioning from conventional to sustainable power generation (原題)
Marisa Martins, Miguel Oliveira, A. Borges
🤖 gxceed AI 要約
日本語
ポルトガルの条件で9つの発電経路（再生可能7・化石2）をcradle-to-gateでLCA評価した研究。石炭・天然ガスは約1.28・0.79 kg CO2eq/kWhと高く、直接バイオマス燃焼はほぼカーボンニュートラル（約0.004）、電解水素は運用排出ゼロ。一方バイオガス系はメタン漏洩により中間的な影響を示す。再生可能水素と持続可能バイオマスの統合が電力の深層脱炭素に有望と結論づける。
English
A cradle-to-gate LCA of nine electricity pathways under Portuguese conditions (seven renewable, two fossil). Coal and natural gas emit ~1.28 and 0.79 kg CO2eq/kWh, while direct biomass combustion is near carbon-neutral (~0.004) and electrolysis-based hydrogen shows zero operational emissions. Biogas/biomethane pathways show intermediate impacts driven by methane slip. Integrating renewable hydrogen with sustainable biomass emerges as a promising deep-decarbonization strategy.
Unofficial AI-generated summary based on the public title and abstract. Not an official translation.
📝 gxceed 編集解説 — Why this matters
日本のGX文脈において
日本では水素・バイオマスは第6次エネルギー基本計画やGX実現に向けた重点分野であり、発電段階のLCA比較は電源構成や水素導入政策の議論に定量的根拠を提供する。メタン漏洩の影響評価は国内のバイオマス調達・排出係数設計にも示唆を与える。
In the global GX context
Provides comparative life-cycle evidence on hydrogen and bioenergy power pathways relevant to global decarbonization planning and to disclosure of Scope 3 and supply-chain emissions. The methane-slip finding is directly relevant to how biomethane pathways are credited under climate frameworks and to GHG accounting of fugitive emissions.
👥 読者別の含意
🔬研究者:発電経路間のLCA比較手法と、メタン漏洩がバイオマス系の気候影響を左右する点を参照できる。
🏢実務担当者:水素・バイオマス調達や再エネ電源選択の際、ライフサイクル排出とメタン漏洩リスクを考慮した調達判断に活用できる。
🏛政策担当者:水素・バイオマス導入政策や排出係数設計において、運用排出ゼロとライフサイクル影響の差を踏まえた制度設計の参考になる。
📄 Abstract（原文）
The transition toward climate-neutral energy systems requires robust comparisons of alternative electricity generation pathways based on consistent life-cycle frameworks. This study performs a cradle-to-gate life cycle assessment of nine electricity production routes under Portuguese conditions, including seven renewable energy-based systems and two fossil-based systems. The renewable pathways comprise direct biomass combustion, upgraded biogas combustion, synthetic biomethane produced via carbon dioxide methanation with green hydrogen, and hydrogen-based electricity generated either from biomethane steam reforming or solar photovoltaic-powered water electrolysis. Hydrogen utilisation was evaluated through both combustion and proton exchange membrane fuel cells. Environmental impacts were quantified across six categories, including global warming potential, acidification, particulate matter formation, human toxicity, land use and water consumption. Results show that fossil pathways remain the dominant sources of greenhouse gas emissions, with coal and natural gas producing approximately 1.28 and 0.79 kg CO2 eq per kWh, respectively. In contrast, direct biomass combustion exhibits near-carbon–neutral performance (≈ 0.004 kg CO2 eq/kWh), while electrolysis-based hydrogen pathways achieve zero operational emissions within the assessed cradle-to-gate boundaries (which exclude infrastructure manufacturing). Meanwhile, pathways relying on biogas and biomethane exhibit intermediate climate impacts driven by fugitive methane slip. Overall, the integration of renewable hydrogen and sustainably sourced biomass emerges as a promising strategy for deep decarbonisation of electricity systems. These findings provide quantitative insights to support the transition toward a carbon–neutral Portuguese energy system by 2050.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://www.nature.com/articles/s41598-026-63845-w_reference.pdffirst seen 2026-10-29 05:28:10 · last seen 2026-11-06 05:29:02
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