The Happo Noshiro Offshore Wind Power Project is a significant step in Japan’s renewable energy expansion. Positioned off the coasts of Happo Town and Noshiro City in Akita Prefecture, this project aims to drive the country’s transition toward sustainable energy while promoting regional economic growth and environmental responsibility. With a planned capacity of 375 MW, this initiative underscores Japan’s commitment to offshore wind development.
➡ For an overview of all ten Promotion Areas as of 2025, see:
Promotion Areas for Offshore Wind in Japan – 2025 Overview
1. Project Overview
| Project name | Happo Noshiro Offshore Wind |
| Developer | Happo–Noshiro Offshore Wind GK |
| stakeholders | ENEOS Renewable Energy Corporation, Iberdrola Renewables Japan, Tohoku Electric Power |
| Location | Offshore happo town and Noshiro City, AKITA Prefecture |
| Type | Fixed-bottom Offshore Wind Power |
| WTG | Vestas |
| Price | 3 JPY/kWh |
| Capacity | 375 MW (15 MW × 25 turbines) |
| Start of Construction | April 2025 |
| Operation Period | June 2029 – 2054 |
2. Location
2-1. Sea & Geographical Features
A wide area off the coast of northern Akita Prefecture. Strong seasonal winds are expected in the Sea of Japan, and good wind conditions are expected. The water depth is estimated to be around 30m.
2-2. Port Infrastructure & Grid Connection
The base port is expected to be Noshiro Port (designated port in Akita Prefecture). Generated electricity is planned to be connected to the power grid under the jurisdiction of Tohoku Electric Power Co.
3. Project Overview
3-1. Consortium Members
Under the overall coordination of Eneos Renewable Energy (ERE), the project aims to ensure smooth implementation through close collaboration between Iberdrola’s expertise in offshore wind power and Tohoku Electric Power’s deep understanding of the local community, with a focus on communication and coordination with regional stakeholders.
ENEOS Renewable Energy Corporation
- Serves as the lead company overseeing the entire project, including acting as the main contact for local stakeholders
- Drives the project forward based on insights gained from early development since 2017 and relationships built with local communities
Iberdrola Renewables Japan, K.K.
- Responsible for design, construction, operation, safety and quality, and risk management
- Promotes alignment between European best practices and Japan’s unique natural and social conditions
Tohoku Electric Power Co., Inc.
- Handles environmental assessments, design and construction of onshore electrical facilities, and operational management through its subsidiary
- Leverages its experience and know-how as a locally rooted utility to facilitate successful local implementation
4. Project Implementation Structure
5. Project Schedule
5-1. Overall schedule
- 2017-Present: Environmental assessments, site surveys, and stakeholder engagement
- 2026 January: Onshore construction begins
- 2027 May: Offshore foundation work commences
- 2028 June: Installation of turbines and transmission systems
- 2029 June: Expected commercial operation date
5-2. EIA status
| Prefecture | Project name | Developer | EIA stage | Project Scale | Last updated |
|---|---|---|---|---|---|
| Akita | Happo–Noshiro Offshore Wind Power Project | Happo–Noshiro Offshore Wind GK | Preparation Document | The wind farm will have a total output of 356,000 kW (356.0 MW), consisting of 25 wind turbines each rated at 15,000 kW (15.0 MW). | Oct 7, 2025 |
| Akita | (Tentative name) Offshore Wind Power Project off Happo Town and Noshiro City, Akita Prefecture | TEPCO Renewable Power, Inc. | Project Terminated | Total output: up to 390 MW; per-turbine output: 15 MW; 26 turbines | May 21, 2024 |
| Akita | (Tentative name) Offshore Wind Power Project off Happo Town and Noshiro City | JERA Co., Inc. and Electric Power Development Co., Ltd. (J-POWER) | Method Statement | Total output: up to 356 MW; up to 30 turbines (assuming 12 MW per turbine) | Oct 31, 2023 |
| Akita | (Tentative name) Offshore Wind Farm Project off Happo Town and Noshiro City, Akita Prefecture | RWE Renewables Japan GK and Kyuden Mirai Energy Co., Inc. | Project Terminated | Total output: approx. up to 360 MW; per-turbine output: 11 or 14 MW class; 33 turbines (11 MW) or 26 turbines (14 MW) | Apr 4, 2023 |
| Akita | (Tentative name) Offshore Wind Power Project off Happo Town and Noshiro City, Akita Prefecture | Mitsubishi Corporation Offshore Wind Ltd. | Project Terminated | Total output: up to 405 MW; per-turbine output: 11–15 MW; number of turbines: approx. 27–33 | Jan 31, 2023 |
6. CAPEX & OPEX Estimates
Evaluating the profitability of offshore wind projects requires close attention to cost-related indicators such as CAPEX, OPEX, LCOE, and IRR. However, in Japan’s designated Promotion Zones, publicly available cost data remain scarce, leaving investors and developers with limited information for decision-making.
To address this, we estimated CAPEX, OPEX, LCOE, and IRR using the NEDO cost model, based on representative site conditions including distance to shore, water depth, and distance to port.
👉 Read the full article here
Conclusion
The Happo Noshiro Offshore Wind Power Project represents a major milestone in Japan’s renewable energy journey. With its focus on sustainability, economic development, and technological excellence, it sets the stage for the country’s offshore wind expansion.
For industry professionals, investors, and policymakers, this project serves as a testament to Japan’s offshore wind potential. Stay tuned to DeepWind for ongoing updates on offshore wind developments in Japan.
To explore how this area compares nationally and understand Japan’s offshore wind roadmap, visit:
Promotion Areas for Offshore Wind in Japan – 2025 Overview —
your guide to Japan’s offshore wind Promotion Areas.
Weekly digest with actionable insights for investors, developers, and stakeholders in Japan’s offshore wind. 🎁 Welcome gift: Japan Offshore Wind: 2025 Market Outlook (PDF)📩 DeepWind Weekly
- 🔍Market Insights – Understand the latest trends and key topics in Japan’s offshore wind market
- 🏛️Policy & Regulations – Explore Japan’s legal frameworks, auction systems, and designated promotion zones.
- 🌊Projects – Get an overview of offshore wind projects across Japan’s coastal regions.
- 🛠️Technology & Innovation – Discover the latest technologies and innovations shaping Japan’s offshore wind sector.
- 💡Cost Analysis – Dive into Japan-specific LCOE insights and offshore wind cost structures.
