Mori Building and Ken Corporation submitted the draft environmental impact assessment for their Shimokita-Seibu onshore wind project in Mutsu City and Sai Village, Aomori Prefecture.
According to the document released for public viewing on May 22, 2026, the companies plan to install 10 4.5MW-class turbines across a 731ha site. Their combined output is expected to be capped at 42MW due to grid connection size limitations. The companies target beginning construction in May 2028 and commercial operations in March 2031.
The developers filed Shimokita-Seibu’s first full environmental impact assessment-related document, the methodology, in April 2024. As a Class 2 onshore wind power plant with capacity between 37.5MW and 50MW, the project was exempt from submitting the primary consideration document that marks the beginning of the process for larger assets.
Several onshore wind farms already operate in the vicinity, including J-POWER’s 19.5MW Oma Wind Power Plant commissioned in 2016, Sakura Wind Power’s 1.7MW Sai Wind Power Plant brought online in 2011, and Shimin Furyoku Hatsuden Oma’s 1MW Oma Shimin Wind Power Plant commissioned in 2006.
Onshore wind projects undergoing environmental impact assessment in the area include Eurus Energy’s up to 84MW Satogadaira and Okayama Kensetsu’s up to 46.2MW Oma-Okoppe. Both are currently in the methodology stage, which they reached in January 2026 and November 2024, respectively.
Primarily real estate companies, both Mori Building and Ken Corporation have also invested in solar projects. Among other activities, the former recently built 12MW of agrisolar capacity and three solar-plus-storage hybrid assets totaling 7.2MW for intra-group PPAs. The latter owns eight power plants with a combined output of 69.6MW that were commissioned between 2015 and 2018. Shimokita-Seibu is both companies’ first disclosed wind project.
