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Japan offshore wind 2026: third-round auctions and the floating wind opportunity

Japan's third-round offshore wind auctions (Round 3, awarded December 2024) brought total awarded capacity to 4.2 GW across multiple sites. With 2.8 GW under construction and 1.4 GW commissioning planned for 2027–2028, Japan is on track to meet 10 GW by 2030 target. The floating offshore wind opportunity beyond the shallow-water round is the next-decade story.

By Arjun Nair··2 min read

In 50 words: Japan's third-round offshore wind auctions (December 2024) brought total awarded capacity to 4.2 GW across multiple sites. With 2.8 GW under construction and 1.4 GW commissioning planned for 2027–2028, Japan is on track for 10 GW by 2030 target. Floating offshore wind beyond shallow-water rounds is the next-decade story.

Where Japan stands

Cumulative offshore wind capacity in Japan:

  • Operational: ~150 MW (mostly pilot scale)
  • Under construction: 2.8 GW (Round 1 + Round 2 + early Round 3)
  • Awarded but pre-construction: 1.4 GW
  • Round 4 expected award (late 2026): ~1.8 GW

10 GW by 2030 target — achievable if construction pace holds and Round 4 + Round 5 award smoothly.

Round 3 winners (Dec 2024)

The third-round auctions awarded 4 sites totalling ~1.4 GW, with winning consortiums dominated by:

  • Mitsubishi Corporation (with Chubu Electric, Eurus Energy)
  • JERA (with Itochu, Tokyo Gas)
  • Marubeni
  • Renova
  • TEPCO Renewable Power (with various partners)

Winning tariffs ranged from ¥3.0 to ¥4.5/kWh — competitive vs Japan's renewable energy alternatives.

Why Japan offshore wind matters

Three structural factors:

  1. Limited onshore land — Japan has aggressive renewable targets but small land area; offshore is essential
  2. Strong wind resource along coastlines, particularly northeast (Tohoku) and northwest (Akita)
  3. Industrial decarbonisation — Japan's steel, chemicals, and refining industries need clean firm power; offshore wind provides this at scale

The floating opportunity

Japan's continental shelf is narrow — water depths drop quickly from shore. Beyond ~30 km offshore, water depths exceed 60m, making fixed-bottom turbines uneconomic. Floating offshore wind is essential for Japan to scale beyond ~15 GW.

Major floating projects:

  • Goto Islands floating array (10 MW operational pilot)
  • Goto Phase 2 (planned 100+ MW)
  • Multiple commercial floating tenders expected 2027–2028

Floating turbine OEMs targeting Japan:

  • Vestas
  • Siemens Gamesa
  • MingYang (Chinese — political sensitivity)
  • Hitachi (domestic option)
  • GE Vernova

Supply chain

Japan's offshore wind supply chain has three constraints:

  1. Installation vessels — limited Asian fleet, contention with Korea, Taiwan, Vietnam
  2. Local content requirements — Japanese policy favours domestic suppliers but capacity is thin
  3. Port infrastructure — Japanese ports need upgrades for monopile staging

What developers should expect

For Round 4 (expected award late 2026):

  • 4 sites totalling ~1.8 GW
  • Tariff guidance similar to Round 3
  • Local content expectations rising
  • Floating wind component possible

What to watch next

The first Japanese commercial-scale floating offshore wind project (50+ MW, expected H2 2026 or 2027) will set technology + economics benchmarks for the Asian floating wind market. Outcome shapes whether Japan hits 15+ GW offshore wind by 2035.

Researched and drafted with AI assistance; reviewed and edited by the named author within 24 hours of draft.

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