欧州連合における炭素価格と石炭退出：価格シグナルと段階的廃止コミットメントの相補性、2005–2024年
Carbon Pricing and Coal Displacement in the European Union: Complementarity Between Price Signals and Phase-Out Commitments, 2005–2024 (原題)
T. Wołowiec, O. Pavlova, O. Liashenko, Sylwester Bogacki, K. Pavlov, Sylwia Skrzypek-Ahmed, K. Nahirska, Roman Romaniuk, Nazar Semenov
🤖 gxceed AI 要約
日本語
EU-ETSが発電構成に与えた影響を、2005–2024年の27加盟国パネルと事前石炭依存度との交互作用で識別した。炭素価格1ユーロ上昇は石炭シェアを0.138ポイント低下させるが、再エネ導入には効果がない。石炭退出効果は国内段階的廃止コミットメントを持つ国でのみ有意で、価格と政策は代替ではなく補完関係にある。
English
Using a 2005–2024 panel of EU-27 states and pre-ETS fossil exposure, the authors identify carbon pricing effects on generation mix. A €1 allowance price rise cuts coal share by 0.138 pp per unit of pre-ETS coal exposure, with no effect on renewables. The coal effect holds only where national phase-out commitments exist, showing price signals and phase-out policy are complements, not substitutes.
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GX-ETSと石炭火力の段階的退出が議論されており、価格シグナル単独では不十分で国内退出コミットメントとの組合せが有効とする本知見は、GX推進法やエネルギー基本計画の設計に直接示唆を与える。
In the global GX context
As ISSB/CSRD disclosure and carbon pricing expand, this paper shows emissions trading alone may not shift fuel mix without complementary national phase-out commitments—directly relevant to EU ETS extension debates and jurisdictions like Japan considering carbon pricing without exit trajectories.
👥 読者別の含意
🔬研究者:炭素価格の因果効果を識別する際、共通トレンドと国別事前露出の交互作用を用いる手法は、他のETS評価研究に応用可能。
🏢実務担当者:炭素価格上昇に備える企業は、自社の石炭・ガス依存度と国内退出政策の有無を踏まえ、移行リスクを評価すべき。
🏛政策担当者:炭素価格制度の導入・強化には、国内の石炭退出コミットメントを併せて設計することが実効性を高める。
📄 Abstract（原文）
Whether the European Union Emissions Trading System has influenced the composition of electricity generation remains contested, and the evidence rests largely on aggregate European time series in which carbon prices and clean energy indicators rise together. We show that this design cannot separate a price effect from a common trend: in EU-27 data for 2005–2024, a linear time trend alone accounts for 98 per cent of the variation in renewable electricity, and the allowance price loses all explanatory power once a trend is included. We therefore construct a panel of the 27 Member States over 2005–2024 and identify the effect of carbon pricing from differential exposure, interacting the common allowance price with national fossil generation shares measured over 2000–2004, before the system existed. Three results follow. Carbon cost pressure displaces coal: a one-euro increase in the allowance price reduces the coal share of generation by 0.138 percentage points per unit of pre-ETS coal exposure, and this estimate is robust to country-specific linear trends. The effect is fuel-specific, operating through coal exposure but not gas exposure, as the difference in carbon content implies. Carbon pricing has no detectable effect on renewable deployment; the estimate is a precise null that excludes effects of more than roughly ±0.15 percentage points. Finally, the coal effect is conditional on the policy framework: it is −0.200 in Member States that had adopted a national phase-out commitment by 2019 and statistically indistinguishable from zero elsewhere, with the difference significant at conventional levels. Carbon pricing and phase-out commitments appear to function as complements rather than substitutes, with direct implications for the design of price floors and the extension of emissions trading to jurisdictions without national exit trajectories.
🔗 Provenance — このレコードを発見したソース
- semanticscholar https://doi.org/10.3390/en19194605first seen 2026-10-01 05:17:43 · last seen 2026-10-02 05:14:58
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