What Do EROIs Measure? Implications for Energy Transition Assessment
EROIの測定で何が計測されるか？エネルギー転換評価への影響 (AI 翻訳)
Thomas Norway, Olivier Cavalié
🤖 gxceed AI 要約
日本語
本論文は、エネルギー投資収益率（EROI）の複数の定義が、正味エネルギー余剰の測定とプロセス効率の測定を区別することを示す。外部変種(EXT)のみが社会に利用可能な正味エネルギー余剰を正しく測定し、内部変種(INT)と標準変種(STD)はプロセス効率に収束する。多ソースシステムでは上流の埋め込みエネルギーで調整する必要があり、米国と中国の化石燃料データへの適用で標準手法より高いEROI値が得られ、エネルギー転換政策に影響を与える。
English
This paper demonstrates that different formulations of Energy Return on Investment (EROI) distinguish between measuring net energy surplus and process efficiency. Only the external variant (EXT) correctly measures net energy surplus available to society, while internal (INT) and standard (STD) variants converge to process efficiency. For multi-source systems, upstream embodied energy adjustments are needed. Applied to US and China fossil fuel data, the revised framework yields higher EROI values, with 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
日本のエネルギー転換政策（GX推進）において、EROIの正確な評価は化石燃料から再生可能エネルギーへの移行の実効性判断に直結する。本論文の手法は、日本の資源・エネルギー戦略の評価に応用可能であり、特にLNGや石炭火力の位置づけに示唆を与える。
In the global GX context
This paper clarifies the measurement of EROI, a critical metric for energy transition assessment. It provides a consistent framework that can be applied globally, including to assess the net energy contribution of renewable energy systems and fossil fuels, which is relevant for transition finance and climate policy.
👥 読者別の含意
🔬研究者:Researchers in energy systems modeling and lifecycle analysis should adopt the EXT formulation for consistent net energy assessment.
🏢実務担当者:Practitioners in energy planning and policy evaluation can use the revised EROI framework to avoid misclassifying systems as net energy negative when they are not.
🏛政策担当者:Policymakers should note that standard EROI calculations may underestimate net energy surplus from fossil fuels, affecting transition timelines.
📄 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://arxiv.org/abs/2606.02015first seen 2026-06-25 04:40:03
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