Hokkaido Electric has finalized a 125.5 billion yen budget for the seawall construction at its Tomari Nuclear Power Plant, prioritizing schedule acceleration over cost minimization. The utility aims to complete this massive capital expenditure project by August 2027.
Hokkaido Electric disclosed that its Nuclear Power Generation Division has set the final construction cost for the Tomari plant seawall at 125.5 billion yen. This figure concludes the financial review initiated with the completion schedule announcement in July 2026.
The new structure will reach a height of 19.0 meters above sea level, extending approximately 1,200 meters with a maximum width of 30 meters. It employs a bedrock-supported structure, where foundations rest directly on solid underground rock rather than just surface soil. This design was finalized during the Nuclear Regulation Authority's review meetings in February 2024, ensuring its technical reliability.
While detailed cost breakdowns are not public, the expense likely includes premiums for working in tight spaces within the power plant and measures to avoid interference with other safety upgrades. The confirmation of this cost marks a critical milestone in securing physical safety for the plant's restart.
Construction began on March 28, 2024, and is currently underway. Although the target completion remains August 2027 as previously stated, the company intends to implement further acceleration measures to finish earlier.
Early project completion is vital for the Tomari plant's restart timeline, making it a key factor in the restoration of power supply stability. The 125.5 billion yen outflow is substantial, but Hokkaido Electric stated it will promptly disclose any material impacts on performance. Currently, the direct risk to capital efficiency appears limited.
No other changes to the project terms have been reported. Management has prioritized safety and secured local stakeholder understanding. Investors should monitor progress reports for updates on cost management and construction efficiency leading up to 2027.
Comparing these figures with industry standards highlights the project's scale and technical complexity. The following table contrasts key metrics with typical sector benchmarks.
| Item | Hokkaido Electric (Tomari) | Industry Average / Benchmark |
|---|---|---|
| Construction Cost | 125.5 Billion Yen | Varies significantly (hundreds of millions to tens of billions) |
| Completion Time | August 2027 | Typically 2-4 years post-regulatory approval |
| Seawall Height | 19.0 Meters A.S.L. | Depends on historical tsunami projections |
| Structure Type | Bedrock-Supported | Direct concrete support is common |
Because this involves retrofitting an existing site rather than new construction, unit costs per area tend to be higher than typical greenfield projects. The bedrock-supported structure adds geotechnical expenses but is essential for long-term seismic resilience. While direct comparison with peers is difficult, investments exceeding 100 billion yen are common in the post-Fukushima context.
This disclosure also serves as a testament to the company's engineering capabilities. Managing large-scale construction in confined spaces demonstrates high technical proficiency relevant to both industry standards and potential talent recruitment.
Analyst take
Confirmation of Major Capex Signals Restart Progress
This disclosure goes beyond a simple cost update; it confirms the financial commitment to securing physical safety for the Tomari plant's restart. While 125.5 billion yen is significant, it represents a fraction of the total cost required to bring a nuclear facility back online.
The priority on schedule acceleration indicates high willingness to pay for time value, balancing supply risks against renewable energy integration. This reflects a strategic choice to utilize existing nuclear assets amid a transition away from nuclear dependency. Investors should watch for capacity expansion effects in mid-term results (2025-2026), while job seekers can view this as evidence of the company's engagement with complex infrastructure challenges.
