Vol.196 : Carbon Market Dawn, Coal Comeback: GX-ETS Goes Mandatory, Japan Lifts Coal Curbs, and Kashiwazaki-Kariwa Counts Down
The Hormuz crisis is forcing a critical question: will it accelerate energy self-sufficiency, or deepen Japan's reliance on coal? With electricity prices set to climb, the months ahead will be telling
*Editor’s note: This article was originally published on 4/2/2026 on Linkedin.
Welcome to issue 196 of Japan Climate Curation! 📬 I’m Hiroyasu Ichikawa (ichi), curating Japan’s climate news weekly since 2022 for 530+ subscribers on this Substack & [3,140+ on LinkedIn].
🎧 Audio versions available: English 🇺🇸 | Japanese 🇯🇵
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Disclaimer: Generative AI tools (Perplexity, Gemini, ChatGPT, Claude, NotebookLM) have been used for summary and translation assistance. 🙂
[🇯🇵📰👀Japan Climate News Headlines]*Missed last week’s issue? Click here to catch up
🏭 Japan’s Top Polluters Face New Rules as Carbon Market Advances [Bloomberg Green]
⚫ Japan to Temporarily Lift Coal Power Plant Curbs Over Hormuz Crisis [Nikkei Asia]
⚛️ TEPCO Aims to Start Commercial Operation of Reactor on April 16 [NHK World]
⚡ Japan Spot Power Surges to Three-Year High as War Boosts Fuels [Bloomberg]
🔍 Japan’s Diversified LNG Strategy Cannot Fully Shield It From Price Spikes [IEEFA]
💴 Japan’s GX Transition Bond Was Never About Decarbonization [Green Central Banking]
🌍 Japan’s Energy Picture Fifteen Years Post-Fukushima [Council on Foreign Relations]
☀️ Japan Renewable Energy Update – Tightening Regulations on Solar Power [White & Case]
🚗 Fuel Crisis Powers Surge in EV Interest in Asia-Pacific Region [Reuters]
🌊 Japan and the U.S. Agree to Team Up on Seabed Mining [The New York Times]
【1】🏭 Japan’s Top Polluters Face New Rules as Carbon Market Advances [03/31 Bloomberg Green]
Japan’s GX-ETS entered its mandatory phase in April, requiring 300–400 major firms — covering roughly 60% of national emissions — to begin Scope 1 reporting. Companies must submit emissions calculations and reduction targets by September 2027, ahead of allowance trading starting in 2027. Price floors and ceilings through 2030 add stability, though Bloomberg Intelligence warns the controls may blunt near-term abatement incentives.
💡 Insight: Japan’s GX-ETS launch is a landmark moment — moving from a voluntary system to a legally binding cap-and-trade framework. The market’s real test comes in 2027 when allowance trading begins; the price corridor design and 10% carbon credit offset allowance may limit the price signal needed to drive deep near-term decarbonization. Japan’s GX-ETS is set to become Asia’s second-largest compliance carbon market after China.
【2】⚫ Japan to Temporarily Lift Coal Power Plant Curbs Over Hormuz Crisis [03/26 Nikkei Asia]
Japan’s METI will suspend for one year its 50% utilization cap on low-efficiency coal plants from April 1, as the Strait of Hormuz closure raises LNG procurement uncertainty. The measure could offset roughly 530,000 metric tons of LNG annually — about 13% of Hormuz-routed imports. Japan sources nearly 75% of its coal from Australia, making supply far less exposed to Middle East disruption than oil or LNG. The move mirrors emergency coal expansions already underway across Asia, including South Korea, the Philippines, and Thailand. METI stressed the measure is strictly temporary, though analysts warn that seaborne coal prices — already up 16% since the Iran attack to $135/ton — could rise further if LNG volatility persists into the Northern Hemisphere cooling season.
💡 Insight: The emergency coal relaxation carries a real lock-in risk that the one-year framing understates — Germany’s “temporary” coal expansion after Fukushima persisted for over a decade. The GX-ETS and coal relaxation landing in the same week is the starkest possible illustration of Japan’s energy security-climate tension.
【3】⚛️ TEPCO Aims to Start Commercial Operation of Reactor in Niigata Pref. on April 16 [03/30 NHK World]
TEPCO has formally requested the Nuclear Regulation Authority to approve commercial operation of Kashiwazaki-Kariwa Unit 6 on April 16 — roughly 14 years after it last operated commercially in March 2012. The reactor has been running at full capacity since a damaged electrical leak detection component was replaced. NRA’s final inspection to confirm no equipment irregularities remains the last regulatory hurdle before commercial operation is permitted.
💡 Insight: April 16 is a systemic inflection point for Japan’s entire energy crisis response — commercial operation unlocks roughly 1 million tons/year of LNG displacement. Any further delay would materially undermine confidence in the restart program and extend Japan’s dependence on expensive spot LNG and newly unlocked coal capacity.
【4】⚡ Japan Spot Power Surges to Three-Year High as War Boosts Fuels [03/31 Bloomberg]
Japan’s spot power price surged 32% week-on-week to ¥23.15/kWh on Tuesday — a three-year high — as the Middle East war drives up fossil fuel costs across Asia. The spike was compounded by reduced solar output from overcast weather forecasts and roughly 4 GW of gas-fired plant maintenance outages in the Tokyo area, highlighting Japan’s acute vulnerability to overlapping supply-side pressures.
💡 Insight: At ¥23.15/kWh, spot power is directly squeezing industrial margins for manufacturers, data center operators, and chemical producers. The solar-weather-gas maintenance convergence is a structural warning, not a one-off — making the clearest possible argument for accelerating grid-scale battery storage deployment.
【5】🔍 Japan’s Diversified LNG Procurement Strategy Cannot Fully Shield It From Global Price Spikes [03/26 IEEFA / INSTITUTE FOR ENERGY ECONOMICS AND FINANCIAL ANALYSIS]
IEEFA argues that Japan’s LNG supply diversification strategy offers little protection against global price shocks triggered by the Strait of Hormuz closure. The JKM spot price has already doubled since the conflict began, with TEPCO and Chubu Electric planning April tariff hikes that could raise annual household bills by ¥15,000. Drawing parallels with the 2022 Russia-Ukraine crisis — when Japan’s monthly LNG bill quadrupled — IEEFA warns of potential GDP contraction of up to 3% if disruptions persist, and calls for accelerating domestic renewable deployment as the only durable solution.
💡 Insight: The “diversification = security” narrative is being empirically dismantled in real time — commodity price risk in a globally integrated LNG market cannot be diversified away through geography alone. With government debt at 235% of GDP and ¥13.4 trillion already spent on energy subsidies since 2022, sovereign risk considerations go well beyond energy policy if Brent sustains above $100/barrel.
【6】💴 Japan’s GX Transition Bond Was Never About Decarbonisation [03/30 Green Central Banking]
The GX Economy Transition Bond — the world’s first sovereign transition bond — is functioning primarily as industrial policy financing, not decarbonisation. Cumulative issuance has reached approximately ¥4.2 trillion as of March 2026. Of ¥3 trillion allocated, ~45% went to battery/semiconductor manufacturing and ~33% to R&D, while direct renewable investment is near zero. The 2026 budget includes ¥387.3 billion for AI/robotics, with no climate rationale provided. The CBI certification has not been renewed, and bond markets now price in an illiquidity discount rather than a green premium.
💡 Insight: For investors holding Japan’s GX transition bonds, the lapsed CBI certification and near-zero direct renewable allocation are material credibility signals for ESG due diligence. The bond’s use-of-proceeds data is arguably the most honest available signal of where government climate finance actually flows — telling a very different story than the headline ¥150 trillion GX investment narrative.
【7】🌍 Japan’s Energy Picture Fifteen Years Post-Fukushima [03/18 Council on Foreign Relations]
Fifteen years after Fukushima, CFR senior fellows assess Japan’s energy outlook as one of persistent uncertainty. Nuclear — once 30% of the power mix — remains below 10%, with natural gas filling the gap and now exposing Japan to the Hormuz crisis. The 2025 Strategic Energy Plan presents two scenarios — a nuclear-renewables maximum and an LNG fallback — but CFR warns these are “not so simple” to pivot between amid rapidly changing global energy markets, underscoring the structural fragility Japan has carried since 2011.
💡 Insight: The “two-scenario” energy plan is a policy admission of structural vulnerability, not strategic flexibility. Investors in Japanese utilities or infrastructure exposed to nuclear upside should model restart timelines conservatively — the Kashiwazaki-Kariwa delays are the rule, not the exception.
【8】☀️ Japan Renewable Energy Update – Tightening Regulations on Solar Power [04/01 White & Case]
Japan’s METI announced on March 19 that FIT/FIP subsidies for ground-mounted commercial solar will end from fiscal year 2027, retaining support only for rooftop installations. The move follows a cross-ministry Mega Solar Countermeasure Package adopted in late 2025, which tightens environmental assessments, forest land development permits, and safety regulations. A bill to amend the Electricity Business Act was approved by cabinet on March 24 and is headed to the Diet.
💡 Insight: Projects currently in the pipeline that assumed FIT/FIP support beyond 2027 face stranded development risk. The practical effect is to redirect the solar opportunity toward rooftop installations and perovskite cells — areas where Japan sees genuine competitive advantage and where investor attention should now sharpen.
【9】🚗 Fuel Crisis Powers Surge in EV Interest in Asia-Pacific Region [04/01 Reuters]
The Middle East fuel crisis is triggering a surge in EV interest across Asia-Pacific, with Australia reporting a 100% jump in EV loans and South Korea seeing registrations more than double in March year-on-year. In Japan, Itochu Research Institute’s Sanshiro Fukao said the country is now at a point where “the trend of shifting to EVs is finally starting to move into full swing” due to rising energy costs. “With the government subsidising petrol prices in Japan, people at the moment still think that it will be OK. But I expect the situation is going to get worse within the month.” Japan’s BEV share remains below 2%, but raised purchase subsidies of up to ¥1.3 million and Tesla’s announced service and Supercharger expansion are emerging as catalysts.
💡 Insight: Fukao’s “within the month” warning is the most important near-term signal for Japan watchers — gasoline subsidies are masking the price signal that would otherwise accelerate EV adoption. Meanwhile, BYD’s overseas sales share surged to 50% of total sales in early 2026, representing an accelerating competitive threat for Japanese OEMs.
【10】🌊 Japan and the U.S. Agree to Team Up on Seabed Mining [03/27 The New York Times]
Japan and the United States signed a memorandum of cooperation on deep-sea mining, agreeing to share research and insights through a new bilateral working group. The deal — announced alongside Trump-Takaichi summit agreements — signals Japan’s alignment with U.S. efforts to advance seabed mining outside the UN’s International Seabed Authority framework, raising concerns among ocean governance experts. Some 40 countries have called for a moratorium or ban on the practice. “That Japan would appear to be reviving this type of interest and seeking to work alongside the Trump Administration in deep sea mining would trigger concern and interest from a number of major ocean players, especially China,” said Donald Rothwell of Australian National University.
💡 Insight: This is fundamentally a critical minerals supply chain story — seabed minerals are essential inputs for wind turbines, EV batteries, and power infrastructure. The legal ambiguity (Japan is an UNCLOS signatory; the U.S. is not) creates regulatory risk that any commercial participant will need to price carefully, with China’s response as the key variable to watch.
📬 That’s a wrap for this week! Thank you for reading.
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