On February 18, 2025, the Japan Wind Power Association (JWPA) published its annual report on the country’s installed wind power plant capacity, which it estimates to have reached 5.84GW as of the end of 2024.
According to the report, 170 turbines totaling 703.3MW were added across 23 project sites while 50 turbines totaling 40.3MW across eight sites were decommissioned. With that, the installed wind capacity in Japan increased by 663MW during 2024, the largest annual increase to date. JWPA’s data shows that 46% of the newly added capacity uses Siemens Gamesa turbines, followed by GE Vernova with a 34% share and Vestas with a 17% share.
Geographically, Hokkaido saw the largest, approximately 455MW increase in installed capacity. It remains the only prefecture with over 1GW of installed capacity and the TSO area with the second highest wind capacity after Tohoku, which has over 2.2GW installed.
Most notably, in January 2024, JERA commissioned Japan’s largest operational offshore wind project, the 112MW Ishikari Bay New Port Offshore Wind Farm, which has output limited to 99.99MW due to grid connection capacity constraint. In total, the report says, Japan had 253.4MW of operational offshore wind capacity across seven projects as of the end of the year.
The remaining projects commissioned in 2024 were all onshore. Green Power Fukaura, a joint venture between Green Power Investment and Tohoku Electric Power, commissioned the 79.8MW Green Power Fukaura Wind Power Plant in Fukaura Town, Aomori Prefecture.
Separately from project construction, the development of new onshore and offshore projects continued throughout the year with projects like Invenergy’s up to 140MW Shimamaki Wind Generation Project starting the environmental impact assessment process and others like Chubu Electric Power’s 21MW Atsumi No. 2 Wind Power Plant completing it.
