Published: October 5, 2026 | Updated: October 5, 2026
MARKET DYNAMICS
Hokkaido published its first offshore wind supply chain map on 2 October 2026. Compiled by the regional bureau of the Ministry of Economy, Trade and Industry (METI), it lists 27 companies: 18 based in Hokkaido and nine from elsewhere in Japan with offices on the island. The map’s own summary is direct. Local firms have room in foundation fabrication and installation, while turbine assembly and turbine maintenance are handled in-house by the large foreign manufacturers. Two months earlier, Hokkaido’s strategic industry cluster plan set a target of about JPY 768 billion in added value by 2040. That figure is built on the operation and maintenance (O&M) spending of the region’s offshore wind zones. The part of the chain where Hokkaido firms are strongest and the part the target counts do not line up.
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Ten Hokkaido-headquartered firms on the map are classed as already active in offshore wind, led by steel fabricators in Muroran. No local Hokkaido firm has yet entered the electrical segment, from subsea cable to substations.
The plan calculates added value from 2030 to 2040 O&M spending in Hokkaido’s promotion zones, plus related private investment. The map says local firms can reach turbine maintenance only after the manufacturer’s warranty period ends.
The plan centres on Matsumae and Hiyama, up to 1.46 GW combined, designated in July 2025. At the time of the plan, developer selection had not begun. In Kitakyushu, companies gathered around a project already operating. Hokkaido is setting targets first.
The first edition: 27 firms, 18 in Hokkaido, 7 in Muroran
The map was built from a survey of companies with a head office or base in Hokkaido and an interest in offshore wind. Responses were sorted into six segments: surveys, turbine manufacturing, foundation manufacturing, electrical systems, installation, and O&M, meaning the inspection, repair and part replacement that keep turbines running after commissioning. Decommissioning was left off on the assumption that installation firms would cover it.
Of the 18 Hokkaido-based entries, Muroran has seven, Sapporo and Hakodate three each, Tomakomai two, and Chitose, Asahikawa and Rumoi one each. Muroran’s seven include the local works of Penta-Ocean Construction and Hakodate Dock. The city has hosted steel, bridge and shipbuilding firms for decades, and the list follows that industrial base.
Entry status by segment looks like this.
| Segment | Active | Not yet active (interested) | The map’s assessment |
|---|---|---|---|
| Surveys | 1 | 1 | Local firms active. Specialist surveys likely in partnership with major firms |
| Turbine manufacturing | 1 | 1 | Local firms in component processing. Turbine assembly and major components likely depend on foreign majors |
| Foundations | 5 | 4 | Several local firms active. Strong steel processing and fabrication capacity |
| Electrical | 1 | 1 | No local Hokkaido firm active. Main equipment depends on national majors |
| Installation | 4 | 0 | Local firms active. Overall construction management and marine works depend on national majors |
| O&M | 3 | 1 | Turbine maintenance open only after the warranty period. Local firms with maintenance and vessel capability exist |
| Other | 2 | 0 | Worker accommodation, materials supply |
Two cautions apply. First, this is a list of survey respondents. The HOKKAIDO Offshore Wind Industry Promotion Network, set up by the prefecture and the bureau in 2025, had 179 member companies and organisations at the end of April 2026. The map does not count every firm that could take part. Second, the plan aims to list about 30 companies in fiscal 2026 and about 50 from fiscal 2027. The first edition is a step along that path.
Foundations and installation are open to Hokkaido firms, and the turbine mostly is closed
The map judges local entry room to be ample in foundations and installation. In foundations, the Hokkaido firms classed as active are Takayanagi and Narasaki Seisakusho in Muroran, and Aizawa Concrete in Tomakomai. Takayanagi runs its own quay and can take a structure from fabrication to sea transport in-house. Aizawa is developing MIKASA, a concrete floating foundation designed to be built in regional ports. Whether floating foundations can be made in ports without large shipyards is a question for Japan’s supply chain as a whole.
In installation, Sapporo’s Hokkai Denko is classed as active. The map adds that overall construction management and offshore works rely on national majors, and the marine contractors it names, Penta-Ocean, Toyo Construction and DENZAI E&C, are headquartered outside Hokkaido.
The turbine itself is where access narrows. The map states that foreign majors handle turbine assembly and turbine O&M in-house, leaving limited room. For O&M it is specific: local involvement in the turbine is limited to the period after the warranty, the term during which the manufacturer guarantees performance.
The Hokkaido firms active in O&M are Hokutaku in Asahikawa and Hakodate Dock. Hokutaku is described as the largest maintainer of onshore turbines in Japan and trains technicians at its own facility. Hakodate Dock is extending ship construction and repair work into offshore wind vessels and marine structures. Maintenance capability exists on the island. For the turbine, the door mostly opens once the warranty ends.
No local firm has yet entered electrical systems. The active cable supplier on the map is Furukawa Electric, which designed, made and laid subsea cable at Ishikari Bay New Port and Hibikinada in Kitakyushu.
The JPY 768bn added-value target is calculated from O&M spending
The cluster plan sets three targets for 2040: about JPY 328.5 billion in private capital investment, about JPY 768.4 billion in added value from the offshore wind industry, and about 10,620 people trained. Added value here means revenue minus purchased inputs, the income that stays in the region. Interim targets to fiscal 2030 are JPY 12 billion in cumulative investment, JPY 70 billion in cumulative added value, and 1,720 people.
The method behind the two money targets matters. The plan says added value combines two items: O&M spending expected in Hokkaido’s promotion zones from 2030 to 2040, and the private investment that accompanies it. The investment target is built the same way, assuming maintenance-related investment of JPY 12,300 per kW per year over eleven years, plus private capital spending. As far as the plan explains it, construction orders for turbines, foundations and installation are not the core of either calculation.
This is where the map and the plan collide. The map puts Hokkaido’s depth in foundations and installation, both construction-phase work. In O&M, the turbine is maintained by the foreign manufacturer for the warranty period. The target rests largely on spending in the part of the chain where local access is narrowest.
In DeepWind’s reading, this does not make the target wrong. O&M runs for twenty years or more and tends to stay local. The difficulty is that the target does not show how much of that spending will reach Hokkaido firms. Three contract questions will likely decide how much of the target is met. Which tasks can local companies take as subcontractors under a manufacturer’s service agreement? How long does the warranty run? And who takes over afterwards?
The 1.46 GW anchor at Matsumae and Hiyama has no developer yet
The plan’s core is two promotion zones, areas where the government has decided to run a developer tender: Matsumae (250 to 320 MW) and Hiyama (910 to 1,140 MW), up to 1.46 GW combined. Both were designated on 30 July 2025. When the plan was written, the government had yet to issue tender guidelines and select developers. Private investment, from surveys onward, follows that selection.
Kitakyushu shows the opposite order. The 220 MW Hibikinada offshore wind farm began operating in March 2026, and around 50 companies launched the industry body REACH in May. Construction and O&M records came first, and the companies gathered around them. Hokkaido’s plan sets a company count and an income target before the anchor projects have developers.
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Timing matters for the target as well. Added value is counted on O&M from 2030 to 2040. When the two zones start operating depends on developer selection and construction schedules. A later start leaves fewer years of O&M inside the window.
Muroran, Hakodate, Ishikari: ports and vessels are already moving
Ports and vessels have taken shape ahead of the company list. Muroran is home port to several SEP vessels, jack-up ships that lower legs to the seabed and lift their hulls clear of the waves to install turbines. They include one of the world’s largest self-propelled units, with a 2,500-tonne crane. Hakodate signed an agreement to host a JWFC-owned SEP vessel from 15 May 2026. At Ishikari Bay New Port, an offshore wind farm inside the port area is already operating, and Toyo Construction runs its cable-laying vessel DISCOVERY from the port.
The plan also flags cabotage, the rule that limits domestic coastal shipping to Japanese-flagged vessels. Japan has no large domestic carriers for long, heavy components, and using foreign ships is restricted, which the plan says could delay vessel procurement and raise cost. Port readiness alone will not move a Hokkaido-built foundation to its site if the ships to carry it are missing.
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Hokkaido’s plan counts income in the part of the chain where its own firms are weakest.
The map shows local strength in foundation fabrication and installation. The plan’s target is built on O&M spending after commissioning, and the turbine share of that spending sits with foreign manufacturers through the warranty period. The size of the target matters less than the gap between how it is counted and where local firms can actually enter. That gap is also where the plan’s progress will be hardest to read from the outside.
For suppliers, the next signals are the tender terms for Matsumae and Hiyama and how the winning developers structure procurement. Where foundations and structures are built, and which tasks a service agreement leaves to local firms, will be decided by developers and turbine makers. For policymakers, a second edition of the map with more names would help. Showing how the plan will measure the money that actually reaches Hokkaido firms would help more.
Related DeepWind Articles
- REACH Launched in Kitakyushu: What Japan’s First Operational-Anchor Offshore Wind Cluster Means
- Inside Japan’s ¥83.3bn GX Supply Chain Subsidy: Manufacturing Capacity Floors vs Pipeline Reality
- Hokkaido Hiyama Offshore Wind Project
- Hokkaido Matsumae Offshore Wind Project
- Japan’s Offshore Wind Supply Chain: Progress and Future Challenges
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