Published: April 17, 2026
Last updated: April 18, 2026
Japan’s offshore wind execution layer continued to take shape this week — with a milestone in domestic manufacturing, a safety incident that raises structural questions about O&M, and a new government program targeting floating wind’s installation bottleneck.
For a structured overview of Japan’s offshore wind market—including policy, investment dynamics, costs, and supply-chain constraints—see our pillar article.
👉 Japan Offshore Wind Market Analysis (Pillar)
Komaihaltec Opens Japan’s First Dedicated Offshore Wind Tower Factory
On April 13, Komaihaltec held the completion ceremony for a new factory building at its Futtsu plant in Chiba Prefecture — Japan’s first full-scale manufacturing facility dedicated to offshore wind towers.
The facility is equipped to process steel plates up to 80mm thick, forming them into welded rings up to 10m in diameter. This enables production of towers for 15MW-class turbines — the scale now being deployed in Japan’s Round 2 projects. Initial production targets 20–30 towers per year, with overseas supply also in scope.
A key feature of the facility is its integrated logistics: finished towers can be shipped directly from the factory’s quayside berth via sea transport, eliminating the need for overland heavy haulage.
The supply chain linkage is worth highlighting. The base material — offshore-grade steel plate — will be sourced from Nippon Steel’s Kimitsu works, located nearby in Chiba Prefecture. This is the same facility that recently completed performance evaluation of ultra-thick steel plates up to 140mm under METI standards, as covered in last week’s DeepWind Weekly. The proximity of material supplier and tower manufacturer creates a geographically concentrated production cluster — a structural advantage for cost and logistics efficiency.
Komaihaltec CEO Emi Komai noted that the company’s dual expertise in bridge construction and onshore wind turbine manufacturing enables it to propose quality control methods and domestic materials suited to Japan’s conditions — positioning the company to differentiate against Asian competitors.
Chiba Governor Toshihito Kumagai, attending as a guest, emphasized the strategic significance of domestic energy supply infrastructure in the context of heightened geopolitical risks, including tensions in the Middle East.
Why This Matters
Japan’s offshore wind tower supply has until now been entirely dependent on imports. This factory represents the first step toward domestic production capacity at a commercially relevant scale. Combined with the Nippon Steel steel plate development, a domestic supply chain from raw material to finished tower is beginning to materialize — something that did not exist six months ago.
Second Blade Failure in Akita: Same Model, Same O&M Provider, Similar Conditions
On April 12, a blade approximately 40m long was found broken near the root on an onshore wind turbine at the “Kaze no Okoku Oga Wind Farm” in Oga City, Akita Prefecture. No injuries were reported. The remaining three turbines at the site have been shut down.
The incident raises significant concerns because of its parallels with a previous accident:
- Same turbine model: The turbine is an Enercon E-82, the same model involved in a fatal blade drop in Akita City in May 2025, where a nearby individual was found dead.
- Same O&M contractor: Both turbines were maintained by Hitachi Power Solutions (Ibaraki Prefecture).
- Similar site conditions: Both sites are located on the coast near river mouths — the Akita City site near the Omono River, and the Oga City site near the Funakoshi waterway connecting Lake Hachiro to the Sea of Japan. Both are exposed to strong seasonal winds from the northwest.
At the time of the incident, a strong wind advisory was in effect across Akita Prefecture. The site is approximately 350m from a major tourist facility (Oga General Tourist Information Center). METI is scheduled to conduct an on-site inspection on April 14.
Why This Matters for Offshore Wind
While this is an onshore incident, the implications for offshore wind are direct.
Social acceptance: Akita Prefecture is Japan’s most concentrated offshore wind development zone, with multiple Round 2 projects under construction or in advanced planning. Repeated blade failures — particularly one involving a fatality — risk eroding the local community support that is a prerequisite for offshore wind project advancement under Japan’s promotion zone framework.
O&M assurance: The pattern of same-model, same-contractor failures raises a structural question: if a specific turbine model and maintenance regime produce repeated failures in onshore coastal environments, what level of assurance can be provided for offshore installations operating in more demanding conditions? This is particularly relevant as Japan’s offshore wind market scales up and O&M contracts become a critical element of project bankability.
MLIT Launches Floating Wind Installation Technology Development Program
On April 7, MLIT’s Ports and Harbours Bureau announced the creation of a new technology development program: “Establishment of Optimal Offshore Construction Methods for Floating Offshore Wind Power.” The first call for proposals is now open, with a deadline of May 15, 2026.
Background
The program responds to two recent policy developments:
- The amended Renewable Energy Sea Area Utilization Act, which enables offshore wind installation in Japan’s Exclusive Economic Zone (EEZ)
- The Offshore Wind Industry Vision (2nd Edition), which established formal project formation targets for floating offshore wind
Despite these policy advances, proven installation methods for large-scale floating wind deployment in Japan’s conditions do not yet exist. This program is designed to close that gap before commercial-scale projects begin.
Program Structure
The program solicits technology development proposals from private companies across two themes:
Theme 1 — Port-side efficiency: Technology development related to the installation, assembly, and related processes of floating wind equipment at ports.
Theme 2 — Offshore efficiency and safety: Technology development related to offshore installation, maintenance, and floater foundation storage — aimed at improving safety at sea while reducing the burden on port-side operations.
Key terms:
- Project duration: up to 3 years (with annual evaluation for continuation)
- Funding: up to ¥150 million per project per year (tax inclusive)
- Contracts are issued on a single-year basis, even for multi-year projects
Why This Matters
Installation is one of floating wind’s most critical bottlenecks — and one that is specific to Japan’s conditions. The combination of deep water, seismic requirements, limited construction windows on the Sea of Japan coast, and the absence of purpose-built installation infrastructure means that methods proven in European waters cannot be directly transferred.
MLIT’s decision to create a dedicated funding mechanism — rather than relying on general R&D programs — signals that the government views installation methodology as a binding constraint on floating wind deployment. This aligns with the port infrastructure simulation data published in March, which quantified the scale of the challenge (see: MLIT Port Infrastructure Simulation).
For companies involved in marine construction, installation vessel design, mooring systems, and port operations, this program represents a direct opportunity to shape the methods that will underpin Japan’s floating wind deployment from 2030 onward.
Japan’s offshore wind market cannot be understood through a single lens. A cross-cutting view—integrating policy, investment behavior, cost structures, and execution capability—is consolidated in our pillar article.
👉 Japan Offshore Wind Market Analysis (Pillar)