TEPCO Renewable Power launched the environmental impact assessment process for an up to 420MW offshore wind project off the coast of Choshi City, Chiba Prefecture. The company is the first to begin the process for an area awarded in Japan’s inaugural offshore wind auction since the winning consortium withdrew, signaling its intent to participate in the planned re-tender.
According to a primary environmental impact consideration made available for public viewing on August 21, 2026, the developer aims to install 21 to 27 turbines, 15MW to 20MW each, across an approximately 40km² area within the promotion zone designated under the Act on Promoting the Utilization of Sea Areas.
The company’s parent TEPCO Holdings filed a primary consideration for the same area in August 2019, at the time planning an up to 370MW project comprising a maximum of 72 turbines, 5.2MW to 12MW each. It withdrew from the process in March 2022 after losing with its 22.59-yen-per-kWh bid submitted jointly with Ørsted against a Mitsubishi Corporation-led consortium’s 16.49 yen per kWh.
Mitsubishi confirmed its withdrawal from all three Round 1 projects in August 2025, citing among other reasons construction costs that had more than doubled from bid-time projections. Its planned up to 403MW Choshi project had reached the draft environmental impact assessment stage in April 2024.
