Ishikari Bay and Hiyama offshore wind projects in Hokkaido were transferred from Hokkaido Offshore Wind Development, a 50:50 joint venture between Copenhagen Infrastructure Partners and Mitsubishi Heavy Industries, to CI V Japan Co A LLC on January 20, 2026, according to the Ministry of the Environment’s environmental impact assessment database.
The ministry’s records do not provide details on the rationale for the transfer or on the ownership or governance structure of CI V Japan Co A LLC, which appears to be associated with Copenhagen Infrastructure Partners’ fifth flagship fund, CI V. The joint venture partners have not publicly disclosed further information on the matter. Japan Energy Hub has contacted both for comment.
The up to 1GW Ishikari Bay project is located within one of Japan’s offshore wind Promising Zones, which must secure consent from fisheries and other stakeholders before being designated as Promotion Zones and offered through tenders. The up to 1.5GW Hiyama project is located in one of the two areas that are expected to be offered in Round 4 auction. Both are at the first, primary consideration stage of the environmental impact assessment process.
Hokkaido Offshore Wind Development is also undergoing environmental impact assessment for an up to 585MW offshore wind project in Shimamaki, the other Promotion Zone expected to be offered in Round 4, which remains listed under the joint venture based on the latest Ministry of the Environment data.
Copenhagen Infrastructure Partners and Mitsubishi Heavy Industries announced their joint venture focused on offshore wind development in Hokkaido in July 2020.
