What Do EROIs Measure? Implications for Energy Transition Assessment
EROIは何を測定するのか？エネルギー転換評価への示唆 (AI 翻訳)
Thomas Norway, Olivier Cavalié
🤖 gxceed AI 要約
日本語
本論文は、エネルギー収支比（EROI）の複数の定義が純エネルギー余剰と効率のどちらを測定するかを理論的に区別し、外部変種（EXT）のみが社会に利用可能な純余剰を正しく測定することを示す。さらに、複数ソースシステムでの一貫性要件から再配分式を導出し、米国と中国の化石燃料データに適用して標準的な定義よりも高いEROI値を得た。この差はネットエネルギー崖の評価を変え、エネルギー転換政策に直接影響する。
English
This paper distinguishes between EROI formulations that measure net energy surplus versus conversion efficiency, showing that only the external variant (EXT) correctly measures surplus available to society. A reallocation formula is derived for multi-source systems. Applied to U.S. and China fossil fuel data, the revised framework yields systematically higher EROI values, potentially altering the net energy cliff assessment with direct implications for energy transition policy.
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
日本ではエネルギー自給率が低く、再生可能エネルギーや原子力への移行が進む中、純エネルギー余剰の正確な評価は政策判断の基盤となる。本論文の再定義は、日本のエネルギー転換計画の効率性評価に新たな視座を提供する。
In the global GX context
Globally, EROI is a key metric for assessing the viability of energy transitions. This paper resolves long-standing inconsistencies in EROI definitions, which is critical for comparing energy sources and guiding investment in renewables. The findings challenge conventional wisdom on net energy cliffs, affecting policy decisions worldwide.
👥 読者別の含意
🔬研究者:Clarifies the correct EROI formulation for net energy analysis, with implications for energy systems modeling.
🏢実務担当者:Energy planners and investors can use the revised EROI framework to more accurately evaluate project viability.
🏛政策担当者:Highlights that standard EROI measures may misrepresent net energy availability, urging careful metric selection for energy transition policy.
📄 Abstract（原文）
Multiple formulations of the Energy Return on Investment (EROI) coexist in the literature, differing mainly in their treatment of self-consumption and external direct energy inputs. This article shows that these differences are not merely conventional: they determine whether EROI measures the net energy surplus available to society or the internal conversion efficiency of the production process. By benchmarking three established formulations against theoretical limit cases, we demonstrate that only the external variant (EXT), which excludes self-consumed energy from the investment term, correctly measures the net energy surplus available to society. The internal (INT) and standard (STD) variants instead converge toward measures of process efficiency. We further show that, in multi-source systems exchanging direct energy flows, consistency requires converting these flows into their upstream embodied energy equivalents before including them in the energy investment term. A generic reallocation formula is derived and shown to uniquely preserve aggregation consistency. Applied to U.S. oil and gas production (1919--2007) and China's fossil fuel sectors (1995--2010), the revised framework yields systematically higher EROI values than standard formulations, potentially placing the same physical system on opposite sides of the net energy cliff, with direct implications for energy transition assessment and policy.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.48550/arxiv.2606.02015first seen 2026-06-22 04:48:40
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