再エネ専用ディスパッチ契約は、米国のあらゆる炭素価格を上回る炭素税と同等のゼロカーボン計算を実現する：Cipher–Luminant電力購入契約からの証拠
Renewable-only dispatch contracts achieve the same zero-carbon computing as a carbon tax exceeding every operating U.S. carbon price: evidence from the Cipher–Luminant power purchase agreement (原題)
Shreyas Kondapuram, Jiasun Li
🤖 gxceed AI 要約
日本語
ビットコイン採掘のような柔軟な計算負荷について、化石燃料課税と再エネ専用ディスパッチ上限という2つの手段を同一均衡モデルで初めて比較した。Cipher–Luminant PPA（ERCOT、200–210MW）で較正し、再エネ専用契約は完全グリーン化炭素税（約56ドル/tCO2、RGGI・カリフォルニア価格を40–180%上回る）と同じゼロカーボン計算を同じ参入閾値で達成することを示す。再エネ専用契約が柔軟計算負荷の現実的な短期脱炭素手段だと結論づける。
English
This paper nests a fossil-generation carbon tax and a renewable-only dispatch cap in one equilibrium model calibrated to the Cipher–Luminant PPA (200–210 MW, ERCOT). It shows the renewable-only contract achieves identical zero-carbon computing at the same entry threshold as a fully greening tax of ~$56/tCO2, which exceeds RGGI and California allowance prices by 40–180%. Renewable-only dispatch contracts are thus the feasible near-term decarbonization instrument for flexible computing loads.
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
日本ではデータセンター・AI計算需要の急増と再エネ調達（PPA）拡大が政策課題であり、炭素税と再エネ契約の等価性を示す本稿は、GXリーグや非化石証書・長期脱炭素電源オークション設計の議論に示唆を与える。SSBJ開示でScope2調達戦略を説明する企業にも実務的示唆がある。
In the global GX context
Amid global debate over carbon pricing versus procurement-based decarbonization (RE100, 24/7 CFE), this paper offers a rare equilibrium comparison showing renewable-only PPAs can match aggressive carbon taxes for flexible loads. It informs ISSB/CSRD Scope 2 accounting debates and corporate PPA strategy for data centers and mining.
👥 読者別の含意
🔬研究者:炭素税と再エネ契約の等価性を均衡モデルで示す新規枠組みで、柔軟負荷の脱炭素政策研究に有用。
🏢実務担当者:データセンターやマイニング企業が再エネ専用PPAを炭素税回避と同等の脱炭素手段として評価する根拠になる。
🏛政策担当者:炭素価格が低い地域でも再エネ専用契約が実効的な脱炭素手段となり得ることを示し、調達制度設計の参考になる。
📄 Abstract（原文）
Bitcoin mining is the archetypal flexible computing load: an interruptible electricity user that can absorb renewable surplus or shed demand within seconds. Whether hosting such loads lowers grid carbon depends on the contract governing their dispatch, yet the two leading instruments — a Pigouvian tax on fossil generation and a renewable-only dispatch cap — had not been compared inside a single equilibrium model calibrated to a real U.S. mining contract. That gap is closed here by extending the Li (2026) flexible-computing-load framework to nest both instruments and calibrating it to the Cipher Mining–Luminant power purchase agreement (SEC Exhibit 10.35, 2022), a 200–210 MW fixed-price contract inside ERCOT. Analytical solution of the deregulated spot-market variant yields a closed-form fully greening tax at which fossil-served computing exits; the renewable-only cap attains identical zero-carbon computing at the same entry threshold, and the two instruments differ only by a renewable pass-through wedge that is strictly positive under the tax and identically zero under the contract. Numerical solution of the joint capacity–entry–dispatch equilibrium across eight residual-demand distributions confirms all seven comparative-static signs, sign-invariance of the carbon gap over a Wasserstein ambiguity set of radius 1.2, and monotonically heavier worst-case tails (Pareto index 2.50 to 2.10). At contract-calibrated values (R ≈ $69/MWh, c ≈ $45/MWh, e ≈ 0.43 tCO2/MWh) the fully greening tax is ≈ $56/tCO2, exceeding RGGI and California allowance prices by 40–180%. Renewable-only dispatch contracts are therefore the feasible near-term decarbonization instrument for flexible computing loads.
🔗 Provenance — このレコードを発見したソース
- openalex https://doi.org/10.13021/jssr2026.5667first seen 2026-09-26 04:45:04
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