On September 9, 2022, Pattern Energy Group and its affiliate in Japan, Green Power Investment Corporation (GPI), announced it had completed financing and begun full construction of its 112 MW Ishikari Offshore Wind project. Ishikari Offshore Wind is located about 3 km from the shore of Ishikari Bay in Hokkaido, Japan, and will feature a battery storage component with 100 MW x 180 MWh of capacity. The project and associated battery storage are expected to reach commercial operation in December 2023. The project has a 20-year power purchase agreement (PPA) with Hokkaido Electric Power Network for 100% of the power output. Ishikari Offshore Wind will utilize 14 Siemens Gamesa 8.0 MW wind turbines. The turbines are designed to meet local codes and standards regarding typhoons, seismic activities, 50 Hertz operation, and operation in high and low ambient temperatures. The turbines and associated supporting structures received ClassNK certification, which confirms that they meet the technical standards required by the Japanese government to approve construction.

Including Ishikari Offshore Wind, Pattern Energy has eight renewable energy facilities in Japan, either in operation or under construction. The other facilities include three onshore wind power facilities and two solar power facilities in operation, and three wind power facilities under construction.