METI · 資源エネルギー庁 releases · OCCTO · JEPX notices · refreshed hourly · last 3 min ago
Policy & Regulation Watch
Weekly policy digest · 2026-W38
Generated 2026/9/18 18:47:30 for 0 portfolio areas / no technologies · 11 notices considered · auto every Monday 08:00 JST
Japan Power-Market Policy & Regulation Digest — Week 2026-W38 (Sep 14–19)
Portfolio note: The supplied portfolio has no areas, technologies, scenarios or alerts defined. Ranking below therefore reflects general relevance to a renewable developer/IPP/offtaker with FIT/FIP and corporate-PPA exposure. Define portfolio areas and technologies to get area-price and curtailment-specific weighting next week.
---
1) Top 3 regulatory developments
#1 — 104th Wide-Area Grid Development Committee convened (広域系統整備委員会)
- 2026-09-16, OCCTO — [Notice of the 104th Wide-Area Grid Development Committee Meeting](https://www.occto.or.jp/iinkai/kouikikeitouseibi/104.html)
- Why it matters: This committee steers interregional transmission (連系線) expansion. Interconnector capacity directly determines (a) how often surplus solar/wind in exporting regions is curtailed under the 出力制御 priority order, (b) how frequently area prices split from the system price, and (c) medium-term grid-connection headroom for new projects. With today's system price showing a midday trough of 10.59 vs an evening peak of 22.15 (see §4), any change to interconnector plans reshapes the capture-price outlook for solar-heavy portfolios.
- Action relevance: Review the agenda materials once posted; flag any changes to project timelines on corridors serving your intended connection points.
#2 — Long-Term Decarbonized Power Source Auction FAQ updated (長期脱炭素電源オークション)
- 2026-09-15, OCCTO — [Capacity Market: Update to Long-Term Decarbonized Power Source Auction FAQ](https://www.occto.or.jp/various/capacity-market/youryou_faq.html)
- Why it matters: For developers considering storage, hydrogen/ammonia co-firing or renewables-plus-storage bids, the FAQ clarifies eligibility and settlement treatment ahead of the next round. Given the daily spread of 12.20 yen/kWh between today's system min (10.31) and max (22.51), a fixed capacity revenue stream materially de-risks storage and hybrid business cases.
- Action relevance: Compare the updated FAQ against your bid assumptions (revenue-return obligations, other-market participation limits).
#3 — Public naming of members in arrears on capacity contributions (容量拠出金滞納)
- 2026-09-16, OCCTO — [Publication of Names of Members in Arrears on Capacity Contributions](https://www.occto.or.jp/news/013427.html)
- Why it matters: Delinquency on capacity contributions is a leading indicator of retailer financial stress. For IPPs selling under corporate/virtual PPAs via a retailer sleeve, and for FIP generators using aggregators, a listed counterparty is a direct credit-risk flag.
- Action relevance: Cross-check the published list against all PPA, aggregation and balancing-group counterparties; trigger contractual credit-support clauses where applicable.
---
2) Other notable notices (grouped by topic)
Capacity market (容量市場)
- 2026-09-14, OCCTO — July 2026 capacity-contribution calculation parameters published; offtakers should expect pass-through under supply/PPA contracts. ([link](https://www.occto.or.jp/news/013322.html))
- 2026-09-11, OCCTO — Recalculation and settlement of April–May 2026 capacity contributions; anticipate true-up invoices/refunds in pass-through clauses. ([link](https://www.occto.or.jp/news/013364.html))
- 2026-09-11, OCCTO — Regional briefing sessions on capacity-market overview; useful onboarding for new entrants. ([link](https://www.occto.or.jp/news/013384.html))
Supply-demand & reserves (需給・調整力)
- 2026-09-16, OCCTO — Results of FY2026 Reserve Power Source (予備電源) solicitation for FY2027/FY2028; indicates how much retiring thermal is retained as standby, informing scarcity-pricing assumptions. ([link](https://www.occto.or.jp/news/yobidengen_oshirase_2026_2026_boshukaishi_1.html))
- 2026-09-16, OCCTO — 122nd Committee on Balancing Capacity and Supply-Demand Balance Assessment; outcomes feed imbalance-cost expectations for FIP/non-FIT generators. ([link](https://www.occto.or.jp/iinkai/chousei_jukyu/122.html))
Planning & compliance
- 2026-09-11, OCCTO — Submission/publication schedule for FY2027–FY2028 supply, generation-sales and outage plans, plus days treated as holidays; align internal planning calendars. ([link](https://www.occto.or.jp/news/occtosystem2_oshirase_2026_260911_kakusyukeikakusukejuru.html))
Consultations
- 2026-09-17, OCCTO — Proposed amendments to Accounting Rules and Accounting/Procurement Detailed Regulations; internal governance, limited project-economics impact. ([link](https://www.occto.or.jp/iken/2026_260917_ikenboshu.html))
- 2026-09-15, OCCTO — Proposed revisions to Finalized Consumption Notification (確定使用量通知) Business Protocol Standards; relevant to retailers/offtakers whose settlement IT consumes finalized meter data. ([link](https://www.occto.or.jp/iken/2026_260915_kakuteisiyouryoubpkiyakuan.html))
---
3) Upcoming deadlines / consultations
| Deadline | Item | Source |
|---|---|---|
| 2026-10-05 (Mon) | Comments due — Finalized Consumption Notification Business Protocol Standards (opened 2026-09-15) | OCCTO |
| 2026-10-08 (Thu) | Comments due — OCCTO Accounting Rules / Procurement Regulations amendments (opened 2026-09-17) | OCCTO |
| Per published schedule | FY2027–FY2028 plan submission dates (supply, generation-sales, outage plans) — see 2026-09-11 notice for specific dates | OCCTO |
| Dates per notice | Regional capacity-market briefing sessions — see 2026-09-11 notice | OCCTO |
---
4) Market context (JEPX system price, 2026-09-19)
- Prices: System average 16.84 yen/kWh (−0.34 d/d), below the 7-day average of 18.40 and 30-day average of 20.36 — a softening trend into the shoulder season. Range 10.31–22.51; trough at 12:00, peak at 18:30. No floor (0.01) hours and no spike hours.
- Solar-shape signal: Midday average 10.59 vs evening average 22.15; midday depression ratio 0.629 (midday/daily avg). Solar capture prices are running ~37% below the daily average even without any floor hours — a reminder that FIP premiums (基準価格 − 参照価格) and storage arbitrage, not just curtailment, drive solar economics this month. No area-price data was supplied, so interconnector-split risk cannot be assessed this week.
- Volume & certificates: Traded volume 943.2 GWh (sell bids 1,611.1 GWh vs buy bids 1,175.5 GWh — sell-side overhang consistent with ample midday supply). Non-fossil certificates: FIT certificate 0.40 (2026-08-31) with a later print of 0.41 (dated 2026-11-27 in the supplied data — verify this date, it postdates this digest); non-FIT renewable certificate 1.21 (2026-08-28), roughly 3× the FIT certificate, preserving the premium for non-FIT/PPA-sourced attributes.
---
5) Recommended actions
- Counterparty screening: Reconcile the OCCTO arrears list (2026-09-16) against every retailer, aggregator and balancing-group partner in your PPA/FIP chain this week; invoke credit-support or step-in provisions where the contract allows.
- Grid & curtailment watch: Obtain and review the 104th Wide-Area Grid Development Committee materials for interconnector timeline changes affecting your target regions; update curtailment and area-price-spread assumptions in project models accordingly — and populate the portfolio with areas/technologies so next week's digest can weight notices by your actual exposure.
- Revenue stacking & settlement hygiene: (a) Reassess storage/hybrid bids against the updated Long-Term Decarbonized Auction FAQ; (b) budget for April–May capacity-contribution true-ups and July pass-throughs in offtake cost forecasts; (c) if you run settlement systems that ingest finalized meter data, file comments on the protocol revision before 2026-10-05.
76 notices
English summaries and implications generated by Claude from the original Japanese titles · click to open the source
2026-09-17OCCTO 広域機関Consultation定款・業務規程・送配電等業務指針事業者へのお知らせ
Call for Comments on Proposed Amendments to Accounting Rules and Accounting/Procurement Detailed Regulations (Sept 17–Oct 8, 2026)
会計規程及び会計・調達業務の細則に関する規程の変更案に対する意見募集について（意見募集期間：2026年9月17日(木)～2026年10月8日(木)）
→ Primarily internal OCCTO governance, but members can comment on how member-funded accounting and procurement are managed; limited direct impact on project economics.
2026-09-16OCCTO 広域機関Supply-demand調整力等委委員会・検討会
Notice of the 122nd Committee Meeting on Balancing Capacity and Supply-Demand Balance Assessment
第122回 調整力及び需給バランス評価等に関する委員会 開催案内
→ Deliberations on balancing reserve requirements and supply-demand outlooks influence imbalance costs and market-price expectations for renewable generators and traders.
2026-09-16OCCTO 広域機関Consultation事業者へのお知らせ予備電源
Results of FY2026 Reserve Power Source Solicitation (for FY2027 and FY2028 Scheme Commencement)
2026年度予備電源募集（2027年度・2028年度制度適用開始向け）の募集結果について
→ Reveals how much retiring thermal capacity is retained as standby reserve, informing supply-adequacy assumptions and scarcity-pricing expectations traders and offtakers model.
2026-09-16OCCTO 広域機関Capacity market事業者へのお知らせ容量市場
Publication of Names of Members in Arrears on Capacity Contributions under Articles 57 and 32-43(3)
定款第57条および業務規程第32条の43第3項の規定に基づき、容量拠出金の滞納を行った会員の名称を公表します
→ Delinquent retailers face public naming; developers and offtakers should screen PPA counterparties for capacity-payment arrears as a credit-risk signal.
2026-09-16OCCTO 広域機関Grid & curtailment委員会・検討会広域系統整備委
Notice of the 104th Wide-Area Grid Development Committee Meeting
第104回 広域系統整備委員会 開催案内
→ Agenda may advance interregional transmission expansion plans, shaping future grid-connection capacity, curtailment risk and regional price spreads for renewable developers and traders.
2026-09-15OCCTO 広域機関Consultation情報提供・周知発電販売計画等・作業停止計画
Call for Comments on Proposed Revisions to Finalized Consumption Notification Business Protocol Standards (Sept 15–Oct 5, 2026)
確定使用量通知業務ビジネスプロトコル標準規格（変更案）等に対する意見募集について（意見募集期間：2026年9月15日（火）から2026年10月5日（月））
→ Retailers and PPA offtakers whose billing and settlement systems consume finalized metered-usage data should assess required IT changes and submit comments.
2026-09-15OCCTO 広域機関Capacity marketCarbon & GX事業者へのお知らせ容量市場
Capacity Market: Update to Long-Term Decarbonized Power Source Auction FAQ
容量市場 長期脱炭素電源オークションFAQの更新について
→ Developers bidding storage, hydrogen or renewables into the long-term decarbonization auction should review clarified eligibility and settlement rules before the next round.
2026-09-14OCCTO 広域機関Capacity market事業者へのお知らせ容量市場
Capacity Market: Publication of Calculation Parameters for July 2026 Capacity Contributions
容量市場 2026年7月分の容量拠出金算定諸元の公表について
→ Retailers can verify July capacity charges; corporate offtakers should expect these costs to be passed through under supply and PPA contracts.
2026-09-11OCCTO 広域機関情報提供・周知発電販売計画等・作業停止計画
Submission and Publication Schedule for FY2027–FY2028 Plans and Days Treated as Holidays
2027・2028年度各種計画に関する提出・公表スケジュールおよび休日相当として扱う日について
→ Generators and retailers must align supply, generation-sales and outage plan submissions with these deadlines to avoid compliance issues and scheduling errors.
2026-09-11OCCTO 広域機関Capacity market容量市場事業者へのお知らせ
Capacity Market: Recalculation and Settlement of Capacity Contributions for April and May 2026
容量市場 容量拠出金（2026年4・5月分）の再算定と精算の実施について
→ Retailers face adjustment invoices or refunds for April–May 2026; offtakers should anticipate corresponding true-ups in capacity-cost pass-through clauses.
2026-09-11OCCTO 広域機関Capacity market事業者へのお知らせ容量市場
Notice of Regional Briefing Sessions on the Capacity Market Overview
容量市場の概要説明会 各地域での開催のご案内について
→ Useful onboarding for new entrants; developers and retailers can clarify how capacity obligations and payments affect their project revenues and supply costs.
2026-09-10OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market Practical Briefing on Capacity Outage Plan Coordination for FY2027–FY2028 Delivery Years (Updated Manual)
容量市場 実務説明会（容量停止計画の調整業務）（対象実需給年度：2028年度、2027年度）の開催案内について（業務マニュアルの更新に伴う説明）
→ Capacity-market resource holders must follow revised outage-coordination procedures to avoid penalties for unavailability during the 2027 and 2028 delivery years.
2026-09-10OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Handling of Client Certificate Expiration (Expiry Date: September 30, 2026)
クライアント証明書の有効期限切れ対応について（有効期限：2026年9月30日）
→ OCCTO member companies must renew client certificates before 30 September 2026 to avoid losing access to member information and related systems.
2026-09-10OCCTO 広域機関事業者へのお知らせスイッチング支援システム利用状況
Usage Status of the Switching Support System (as of August 31)
スイッチング支援システムの利用状況について（8月31日時点）
→ Latest retail switching volumes indicate customer churn and competition intensity, useful for retailers and corporate PPA offtakers assessing supplier options.
2026-09-09OCCTO 広域機関RenewablesGrid & curtailment情報提供・周知出力抑制に関する検証結果（系統制約）
Verification Results on Renewable Output Curtailment Due to Grid Congestion in Chubu Area (July 2026)
中部エリアにおける流通設備混雑（系統制約）による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年7月分）
→ Shows congestion-related curtailment of variable renewables in Chubu during July; developers and offtakers should monitor local grid constraints affecting delivered volumes.
2026-09-09OCCTO 広域機関Capacity marketCarbon & GX事業者へのお知らせ容量市場
Capacity Market: Briefing Session on Long-Term Decarbonized Power Source Auction (Bidding Year FY2026)
容量市場 長期脱炭素電源オークション（応札年度：2026年度）制度詳細説明会の開催のご案内について
→ Developers of storage, hydrogen-ready or other decarbonized capacity intending to bid in the FY2026 auction should attend to understand rules and requirements.
2026-09-09OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Publication of Names of Members in Arrears on Membership Fees under Article 57 of the Articles
定款第57条の規定に基づき、会費の滞納を行った会員の名称を公表します
→ Named members may signal financial distress; PPA counterparties and traders should check the list when assessing counterparty credit risk.
2026-09-09OCCTO 広域機関報告書・取りまとめ年次報告書
Publication of the FY2026 Annual Report
2026年度年次報告書の公表について
→ OCCTO's annual report summarizes grid, supply-demand and market developments, providing background for renewable project planning and trading strategy.
2026-09-09OCCTO 広域機関RenewablesGrid & curtailment情報提供・周知出力抑制に関する検証結果（系統制約）
Verification Results on Renewable Output Curtailment Due to Grid Congestion in Hokkaido Area (July 2026)
北海道エリアにおける流通設備混雑（系統制約）による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年7月分）
→ Confirms whether July curtailments of variable renewables in Hokkaido were justified; developers should reflect congestion-driven curtailment risk in revenue forecasts and PPA volume terms.
2026-09-08OCCTO 広域機関Supply-demand委員会・検討会需給調整市場小委
Notice of 63rd Balancing Market Subcommittee (Joint with 80th Working Group on Balancing Capacity Segmentation and Wide-Area Procurement)
第63回需給調整市場検討小委員会（第80回 調整力の細分化及び広域調達の技術的検討に関する作業会と合同開催） 開催案内
→ Balancing market design changes may affect imbalance costs and revenue opportunities for aggregators and batteries co-located with renewables.
2026-09-08OCCTO 広域機関委員会・検討会計画評価・検証小委
Notice of the 16th Plan Evaluation and Verification Subcommittee
第16回 計画評価及び検証小委員会 開催案内
→ Review of supply plans and grid development informs expectations on interconnection capacity and transmission expansion timelines for renewable projects.
2026-09-08OCCTO 広域機関事業者へのお知らせ災害時連携計画
Submission of Revised Disaster Response Cooperation Plan to the Minister of Economy, Trade and Industry
災害時連携計画（変更）の経済産業大臣への送付について
→ Updates utility coordination during disasters; limited direct impact, but generators should note resilience expectations and potential emergency response obligations.
2026-09-08JEPX 電力取引
Renewal of the JEPX Trading System
取引システムの更改について
→ Traders should prepare for system migration, possible downtime and interface or API changes affecting spot and forward market participation.
2026-09-03OCCTO 広域機関Capacity marketSupply-demandCarbon & GXConsultation事業者へのお知らせ容量市場
Public Consultation on Capacity Market Manuals for Planned Outage Coordination (Delivery Years FY2028, FY2027), September 3–16, 2026
容量市場業務マニュアル 「容量停止計画の調整業務編 （実需給年度の2年度前に行う容量停止計画 の調整）」 及び 「容量市場業務マニュアル 長期脱炭素電源オークション 実需給期間前から発生するリクワイアメント対応編 (別冊)容量停止計画の調整業務」(対象実需給年度：2028年度、2027年度)に関する意見募集について（意見募集期間: 2026年9月3日～2026年9月16日）
→ Capacity market participants, including long-term decarbonization auction winners, should review outage coordination rules and submit comments by 16 September 2026.
2026-09-02OCCTO 広域機関Grid & curtailmentConsultation定款・業務規程・送配電等業務指針事業者へのお知らせ
Call for Comments on Proposed Amendments to OCCTO Articles, Business Rules and Grid Operation Guidelines (Sept 2–18, 2026)
定款、業務規程及び送配電等業務指針の変更案に対する意見募集について（意見募集期間：2026年9月2日(水)～2026年9月18日(金)午前中）
→ Developers and traders should review proposed grid-access and wheeling rule changes and submit comments before the September 18 morning deadline.
2026-09-02OCCTO 広域機関Capacity marketCarbon & GXConsultation事業者へのお知らせ容量市場
Call for Comments on Long-Term Decarbonized Power Auction Manual: Registration, Bidding and Contract Execution (FY2026 Bidding)
容量市場業務マニュアル 長期脱炭素電源オークション 参加登録・応札・容量確保契約書の締結編（応札年度：2026年度）に関する意見募集について
→ Storage, hydrogen and biomass developers planning FY2026 bids can influence procedural rules on registration, bidding and contract signing.
2026-09-02OCCTO 広域機関Capacity marketCarbon & GXConsultation事業者へのお知らせ容量市場
Publication of FY2026 Long-Term Decarbonized Power Auction Solicitation Guidelines and Capacity Assurance Contract Terms
「容量市場 長期脱炭素電源オークション募集要綱（応札年度：2026年度）」及び「長期脱炭素電源オークション 容量確保契約約款」の公表について
→ Final eligibility, schedule and revenue terms are now fixed, so developers should begin preparing bids for 20-year capacity payments.
2026-09-01OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Temporary Suspension of the Member Information Management System
会員情報管理システムの利用一時停止について
→ OCCTO members should schedule registration updates around the downtime; no direct market impact.
2026-09-01OCCTO 広域機関情報提供・周知その他
Approval of Appointment of OCCTO Officers
役員の選任の認可について
→ Governance update only; no direct impact on renewable developers or traders.
2026-08-26OCCTO 広域機関Capacity market委員会・検討会容量市場検討会
Notice of the 76th Study Group on the Future of the Capacity Market
第76回 容量市場の在り方等に関する検討会 開催案内
→ Agenda items may reshape capacity market design, affecting revenue stacking for solar-plus-storage and retailer capacity cost pass-through.
2026-08-26OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Temporary Suspension of the Member Information Management System
会員情報管理システムの利用一時停止について
→ OCCTO members should schedule registration updates around the downtime; no direct market impact.
2026-08-26OCCTO 広域機関RenewablesGrid & curtailment情報提供・周知出力抑制に関する検証結果（系統制約）
Verification Results of Renewable Curtailment Due to Transmission Congestion in Hokkaido Area (June 2026)
北海道エリアにおける流通設備混雑（系統制約）による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年6月分）
→ Hokkaido asset owners can verify curtailment legitimacy and gauge local congestion risk for PPA volume forecasts.
2026-08-26OCCTO 広域機関RenewablesGrid & curtailment情報提供・周知出力抑制に関する検証結果（系統制約）
Verification Results of Renewable Curtailment Due to Transmission Congestion in Chubu Area (June 2026)
中部エリアにおける流通設備混雑（系統制約）による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年6月分）
→ Chubu developers should check whether congestion-driven curtailments were justified and factor emerging local grid constraints into project siting.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Tohoku Area (April–June 2026)
東北エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Tohoku solar and wind owners can assess curtailment frequency to refine generation forecasts and PPA volume risk provisions.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Chubu Area (April–June 2026)
中部エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Confirms spring curtailment levels in Chubu, informing offtakers' expected delivery volumes and developers' revenue models.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Hokuriku Area (April–June 2026)
北陸エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Hokuriku curtailment data helps developers quantify spring oversupply risk and traders anticipate near-zero daytime spot prices.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Kansai Area (April–June 2026)
関西エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Kansai developers and PPA offtakers can benchmark curtailment losses and validate TSO dispatch order compliance.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Chugoku Area (April–June 2026)
中国エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Chugoku curtailment results inform PPA delivery-shortfall provisions and highlight value of storage co-location.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Shikoku Area (April–June 2026)
四国エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Shikoku asset owners should review curtailment hours to update revenue forecasts and consider flexibility investments.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Kyushu Area (April–June 2026)
九州エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Kyushu remains the highest-curtailment region; developers and offtakers should stress-test PPA economics against reported spring curtailment rates.
2026-08-26OCCTO 広域機関RenewablesSupply-demand情報提供・周知出力抑制に関する検証結果（需給バランス制約）
Verification Results of Renewable Curtailment Due to Supply-Demand Constraints in Okinawa Area (April–June 2026)
沖縄エリアにおける需給バランス制約による再生可能エネルギー発電設備（自然変動電源）の出力抑制に関する検証結果の公表について（2026年4月～6月分）
→ Okinawa's isolated grid shows curtailment exposure for island solar projects, relevant to local PPA structuring.
2026-08-26OCCTO 広域機関事業者へのお知らせ災害時連携計画
Update of Disaster Response Cooperation Plan Case Studies and Related Materials
災害時連携計画 連携事例集等の更新について
→ Generators and retailers should align emergency coordination procedures with updated examples to meet resilience expectations.
2026-08-25OCCTO 広域機関Grid & curtailment委員会・検討会広域系統整備委
Notice of the 103rd Wide-Area Grid Development Committee Meeting
第103回 広域系統整備委員会 開催案内
→ Interregional transmission expansion decisions will shape future curtailment levels and market access for renewables in Hokkaido and Kyushu.
2026-08-25OCCTO 広域機関事業者へのお知らせ供給計画
On Securing Additional Supply Capacity for FY2027
2027年度のさらなる供給力確保について
→ Signals anticipated supply tightness in FY2027, creating opportunities for storage and flexible assets while raising price-volatility risk for traders.
2026-08-24OCCTO 広域機関Renewables事業者へのお知らせ再生可能エネルギー
Publication of Results of the 29th Solar Power Auction (FY2026)
太陽光第29回入札（令和８年度）の結果 掲載について
→ Clearing prices and awarded capacity provide a fresh benchmark for corporate PPA pricing and project return assumptions.
2026-08-21JEPX 電力取引Market rules
Cancellation of the First FY2026 Baseload Market Trading Session
2026年度第1回ベースロード取引の中止について
→ Retailers and traders relying on baseload hedges must seek alternative contracts and monitor the next scheduled session.
2026-08-19OCCTO 広域機関Capacity market事業者へのお知らせ容量市場
Publication of Member Names in Arrears on Capacity Contribution Payments Under Articles and Business Rules
定款第57条および業務規程第32条の43第3項の規定に基づき、容量拠出金の滞納を行った会員の名称を公表します
→ Named retailers pose counterparty credit risk; PPA offtakers and traders should reassess exposure to these entities.
2026-08-19OCCTO 広域機関Consultation事業者へのお知らせ予備電源
[Closed] Call for Comments on Draft Reserve Power Source Guidelines and Contract Terms (FY2027–2028 Start)
＜募集終了＞予備電源募集要綱（2027年度・2028年度制度適用開始向け）（案）及び予備電源契約約款（案）に関する意見募集について（意見募集期間：2026年7月15日(水)～2026年7月28日(火)）
→ Comment period has ended; owners of mothballed thermal units should await final guidelines defining reserve power eligibility and compensation.
2026-08-17OCCTO 広域機関Capacity market事業者へのお知らせ容量市場
Capacity Market: Publication of Capacity Contribution Fee Calculation Parameters for June 2026
容量市場 2026年6月分の容量拠出金算定諸元の公表について
→ Retailers and PPA offtakers can verify the capacity levy embedded in June 2026 costs, clarifying a key non-energy component of delivered power prices.
2026-08-17OCCTO 広域機関Supply-demand調整力等委委員会・検討会
Notice of the 121st Committee on Balancing Capacity and Supply-Demand Balance Evaluation
第121回 調整力及び需給バランス評価等に関する委員会 開催案内
→ Outcomes influence reserve procurement volumes and supply-demand outlooks, affecting balancing costs and spot price expectations for traders.
2026-08-14OCCTO 広域機関委員会・検討会計画評価・検証小委
Notice of the 15th Plan Evaluation and Verification Subcommittee Meeting
第15回 計画評価及び検証小委員会 開催案内
→ The subcommittee reviews supply-demand and grid plan performance; developers should watch findings that may reshape interconnection and generation plan assumptions.
2026-08-12OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Temporary Suspension of the Member Information Management System
会員情報管理システムの利用一時停止について
→ OCCTO members should schedule membership data updates around the outage; no direct effect on market prices or trading.
2026-08-12OCCTO 広域機関事業者へのお知らせスイッチング支援システム利用状況
Usage Status of the Switching Support System (as of July 31)
スイッチング支援システムの利用状況について（7月31日時点）
→ Switching volumes indicate retail competition intensity, helping PPA offtakers and retailers gauge customer churn and market entry conditions.
2026-08-12OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Handling of Client Certificate Expiration (Expiry Date: August 31, 2026)
クライアント証明書の有効期限切れ対応について（有効期限：2026年8月31日）
→ Participants must renew OCCTO system client certificates before August 31, 2026 or risk losing access for plan submissions and market operations.
2026-08-12OCCTO 広域機関情報提供・周知発電販売計画等・作業停止計画
Update to the Guidelines for Preparing Plan Submissions
計画に関する記載要領の更新
→ Generators and traders must follow the revised format for generation, sales and outage plans to avoid rejected submissions and imbalance exposure.
2026-08-12OCCTO 広域機関発電販売計画等・作業停止計画情報提供・周知
Schedule for OCCTO System Usage Applications During the FY2026 Silver Week Holiday Period
2026年度シルバーウィーク期間中の広域機関システム利用申請のスケジュールについて
→ Participants needing system access or applications should submit early ahead of the September holidays to avoid processing delays.
2026-08-07OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market: Updated Briefing Materials and Video for FY2030 Main Auction Practical Session on Registration and Bidding
容量市場 説明会資料・動画の更新について（メインオークション実務説明会（事業者情報・電源等情報・期待容量の登録申請および応札について）（対象実需給年度：2030年度））
→ Prospective bidders, including storage and dispatchable renewable owners, should review updated guidance on registering business, resource and expected-capacity information.
2026-08-07OCCTO 広域機関委員会・検討会グリッドコード検討会
Notice of the 22nd Grid Code Study Group Meeting
第22回 グリッドコード検討会 開催案内
→ Evolving grid code requirements, such as inverter performance and ride-through rules, may add compliance costs for new renewable and storage projects.
2026-08-07OCCTO 広域機関RenewablesConsultation再生可能エネルギー事業者へのお知らせ
[Closed] Public Comment on Proposed Amendments to Renewable Energy Business Rules (August 7–28, 2026)
＜募集終了＞再エネ関連業務規程の変更案に対する意見募集について（意見募集期間：2026年8月7日（金）～2026年8月28日（金））
→ Amendments to OCCTO renewable-related rules are advancing; FIT/FIP developers should review the finalized changes for procedural or operational impacts.
2026-08-07OCCTO 広域機関Capacity marketCarbon & GX事業者へのお知らせ容量市場
Capacity Market: Publication of Decarbonization Roadmaps for FY2025 Long-Term Decarbonized Power Source Auction
容量市場 長期脱炭素電源オークション（応札年度：2025年度）脱炭素化ロードマップの公表について
→ Roadmaps reveal how awarded thermal, hydrogen and ammonia units plan to decarbonize, signaling the long-term firm-capacity landscape renewables will compete against.
2026-08-06OCCTO 広域機関Capacity marketMarket rulesSupply-demand事業者へのお知らせ容量市場
Capacity Market: Publication of Supplementary Auction Results for Delivery Year FY2027
容量市場追加オークション約定結果（対象実需給年度：2027年度）の公表について
→ Clearing results shape FY2027 capacity levy expectations for retailers and PPA offtakers and confirm revenue for cleared capacity providers.
2026-08-03OCCTO 広域機関事業者へのお知らせ総会・会員情報管理システム・会費等
Temporary Suspension of the Member Information Management System
会員情報管理システムの利用一時停止について
→ OCCTO members should plan membership data changes around the downtime; no market pricing implications.
2026-07-30OCCTO 広域機関Supply-demand委員会・検討会需給調整市場小委
Materials for 62nd Balancing Market Subcommittee (Joint with 79th Working Group on Reserve Segmentation and Wide-Area Procurement)
第62回需給調整市場検討小委員会（第79回 調整力の細分化及び広域調達の技術的検討に関する作業会と合同開催） 配布資料
→ Balancing market design changes affect imbalance costs for renewable generators and revenue opportunities for batteries and aggregators providing reserves.
2026-07-30OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market: Publication of OCCTO-Designated Forms for Participation Registration, Delivery Year FY2030
2030年度実需給向け 容量市場 参加登録時の提出書類（当機関指定様式）の公表について
→ Resource owners intending to bid in the FY2030 auction must prepare documentation using these forms to complete registration on time.
2026-07-30OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market: Schedule for FY2026 Main Auction Registration and Bidding (Delivery Year FY2030)
容量市場 2026年度メインオークション（対象実需給年度：2030年度）参加登録・応札等のスケジュールについて
→ Fixed deadlines mean storage and dispatchable renewable developers must register promptly to secure FY2030 capacity revenue.
2026-07-30OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market: Operations Manual on Main Auction Registration, Bidding and Capacity Contract Execution (Delivery Year FY2030)
容量市場 業務マニュアル メインオークションの参加登録・応札・容量確保契約書の締結編（対象実需給年度：2030年度）の公表について
→ The manual details obligations from bidding through contract signing, helping bidders assess penalties and compliance burdens before committing capacity.
2026-07-30OCCTO 広域機関Capacity marketSupply-demand事業者へのお知らせ容量市場
Capacity Market: Publication of FY2026 Main Auction Demand Curve (Delivery Year FY2030)
容量市場 2026年度メインオークション需要曲線（対象実需給年度：2030年度）の公表について
→ The demand curve bounds likely clearing prices, letting bidders set strategies and offtakers estimate FY2030 capacity levy exposure.
2026-07-14JEPX 非化石Certificates
Non-Fossil Value Trading System User Guide Updated
非化石価値取引システム利用ガイドを更新しました。
→ Certificate traders and corporate buyers should review updated procedures to ensure smooth participation in non-fossil certificate auctions.
2026-06-25JEPX 非化石Certificates
FY2026 Non-Fossil Value Trading Market Annual Fees, Transaction Fees and Schedule Published
2026年度非化石価値取引市場の年会費、取引手数料及びスケジュールを公開しました。
→ Sets cost and timing for certificate trading, enabling PPA offtakers and generators to plan RE100 and non-fossil obligation procurement.
2026-06-25JEPX 電力取引Market rules
FY2026 Baseload Market Schedule Published
2026年度ベースロード取引市場のスケジュールを公開しました。
→ Retailers and traders can plan baseload auction participation to hedge supply, and results offer a benchmark for long-term PPA pricing.
2026-06-14METI 経産省
METI and Malaysia's Ministry of Energy Transition and Water Transformation Sign Letter of Intent on Energy Cooperation
経済産業省とマレーシアエネルギー移行・水資源変革省はエネルギー安全保障及びエネルギー移行分野における協力に関する意向表明文書に署名しました
→ Signals cross-border opportunities in hydrogen, CCS and renewables for Japanese developers, though with limited near-term domestic market effect.
2026-06-12METI 経産省
Special Approvals Granted for Electricity and City Gas Bill Discounts Under Support Program for July–September 2026 Usage
2026年7月、8月及び9月使用分の電気・ガス料金支援の実施に伴い、電気・都市ガス料金の値引きを行うことができる特例認可・承認を行いました
→ Government subsidies temporarily lower retail bills, easing consumer cost pressure but weakening the short-term savings pitch for corporate PPAs.
2026-06-11METI 経産省Renewables
Publication of Electricity Utilities Failing to Pay Surcharge Contributions Under the Renewable Energy Special Measures Act
再生可能エネルギー特別措置法に基づき、納付金を納付しない電気事業者を公表します
→ Names retailers defaulting on FIT surcharge payments, flagging counterparty risk for generators and offtakers dealing with those companies.
2026-05-28JEPX 電力取引
Change to the Indirect Transmission Rights Settlement Statement
間接送電権清算書の変更について
→ Traders hedging interzonal price spreads with indirect transmission rights should verify the revised statement format for settlement reconciliation.
2026-03-30JEPX 電力取引Market rules
Trading Rules Have Been Revised
取引規程を改定しました。
→ Traders and PPA parties should review the updated JEPX trading rules, as changes to procedures, fees or eligibility may affect spot and forward market participation.
2026-02-20JEPX 電力取引Market rules
Notice Regarding Suspension of Intraday Trading
時間前取引の停止について
→ Suspension of intraday trading limits renewable generators' ability to adjust positions close to delivery, raising imbalance risk for developers and offtakers.