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回避された環境影響の会計と配分—サステナビリティ報告と投資分析へのスコープ4の統合

Accounting and allocation of avoided environmental impact—Integrating scope 4 in sustainability reporting and investment analysis (原題)

Marcus Gustafsson, Karin Eriksson, Vilma Håkansson, Pontus Cerin

Frontiers in Environmental Economics📚 査読済 / ジャーナル2026-09-03#scope4Origin: Global経営インパクト: 資金調達対象セクター: power
DOI: 10.3389/frevc.2026.1905659
原典: https://doi.org/10.3389/frevc.2026.1905659
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🤖 gxceed AI 要約

日本語

本論文は、再生可能エネルギー技術への資本配分を促進するため、スコープ4（回避された環境影響）を投資分析に統合する方法論を提案する。風力・太陽光を対象に、ブラジル、中国、ドイツ、インド、米国の5地域でライフサイクル評価を用いてスコープ1-3とスコープ4の影響を定量化し、経済配分、質量配分、スコープ1-3影響に基づく配分の3つの方法を比較した。結果、特に化石燃料依存の高い地域ではスコープ4の影響がスコープ1-3を上回り、2050年にネットゼロ電力でも回避影響が上回ることが示された。また、システム構成要素間での回避影響の配分課題を解決し、報告企業と投資家に各要素の貢献を明確化する。

English

This paper proposes a methodology to integrate scope 4 (avoided environmental impact) into investment analysis to facilitate capital allocation toward renewable technologies. Using wind and solar power as examples, it quantifies scope 1-3 and scope 4 impacts via life cycle assessment across five regions (Brazil, China, Germany, India, USA) and compares three allocation methods: economic, mass, and scope 1-3 based. Results show scope 4 can exceed scope 1-3 in several impact categories, especially in fossil-heavy grids, and even with net-zero electricity by 2050, avoided impact remains higher. The paper addresses allocating avoided impact among system components, enabling companies to claim positive effects and attract investors.

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SSBJ開示基準がScope 3までを対象としており、Scope 4は未対応。本手法は、再エネ発電事業者や部品メーカーが投資家向けに自社の貢献を訴求する際の枠組みを提供し、今後の基準策定や統合報告書での活用が期待される。

In the global GX context

Globally, reporting standards (GHG Protocol, ISSB, CSRD) do not yet cover scope 4, but this paper offers a rigorous method to quantify and allocate avoided impacts, which could inform future standard-setting and help investors channel capital to renewables. It provides a framework for companies to credibly claim positive externalities, enhancing their attractiveness to ESG-focused investors.

👥 読者別の含意

🔬研究者:Provides a novel methodology for quantifying and allocating scope 4 impacts, with empirical evidence across regions, useful for advancing LCA and reporting research.

🏢実務担当者:Offers a practical approach for renewable energy companies and investors to measure and communicate avoided impacts, potentially improving access to green finance.

🏛政策担当者:Highlights the need to consider scope 4 in future disclosure standards and provides a basis for policy discussions on incentivizing avoided emissions.

📄 Abstract（原文）

Introduction Capital allocation toward renewable technologies is a prerequisite for the energy transition. Current reporting standards cover greenhouse gas emissions from companies' own operations, purchased energy, and increasingly upstream and downstream activities, while avoided emissions (scope 4) and other generated or avoided environmental impacts are normally not included. This paper presents a methodology for integrating scope 4 and a broader set of environmental indicators into investment analysis and discusses how this can assist investors in capital allocation toward renewable technologies. Methods Taking wind and solar power as examples, environmental impact is quantified from a life cycle perspective in five different geographical settings: Brazil, China, Germany, India, and the USA. The environmental impact in scope 1-3 as well as the potential avoided impact in scope 4 was calculated through life cycle assessment. Three different allocation methods were applied to demonstrate how avoided impact can be divided between system components: economic allocation, mass allocation and allocation according to scope 1-3 impact. Results For both wind and solar power, the scope 4 avoided impact can exceed the scope 1-3 environmental impact in several impact categories, including climate impact, particularly in regions with fossil-based electricity production. A gradual transition to more renewable electricity production is shown to reduce the scope 4 impact over time, but even with "net zero emissions" electricity by 2050 the avoided impact exceeds scope 1-3 for both wind and solar. Finally, this paper addresses the challenge of allocating avoided impact between components of renewable energy systems, where there is no physical relationship between the components and their scope 4 contributions, giving reporting companies and investors a view on how each component contributes to avoided impact. Discussion The study shows that avoided environmental impact, which is not covered in current accounting standards, can be of great importance when assessing renewable energy technologies. The presented methodology could be applied to other systems where avoided impact is created, such as waste-based bioenergy. Allocating avoided impact between components would allow companies behind each of them to claim a share of the positive sustainability effects and make them more attractive to investors.

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