Star Seeds will partner with JPN ENERGY Integrated System to roll out 50 high-voltage grid-scale battery storage assets totaling 100MW/400MWh, the companies announced on July 10, 2025. The agreement is expected to be signed today, July 11, with activities under the deal scheduled to begin in November 2025.
According to the statement, JPN ENERGY will handle development, engineering, procurement, and construction (EPC), and operation and maintenance (O&M). Star Seeds will own the facilities. It expects the revenues generated through the partnership to reach 7.5 billion yen over a three-year period following launch.
Batteries for some of the projects will be supplied by Shanghai Robestec Energy, which in early June 2025 signed a broader battery storage-focused partnership that also includes the supply of 400MWh of equipment.
Originally a fashion retailer, Star Seeds has been increasingly active in the grid-scale storage market. Separately from the Chinese manufacturer, the company said that it was in discussions with Eneres to explore the possibility of the KDDI Group company aggregating its assets and that it partnered with hospital and nursing home operator Sumirekai Group to develop storage facilities on its idle land.
The company acquired its first grid-scale BESS project site for a 2MW/8MWh facility in Aichi Prefecture, also from JPN ENERGY but likely separate from the new partnership, in June 2025.
JPN ENERGY recently also secured EPC and O&M contracts for two 2MW/8MWh projects from Akiyama Kosan. In addition to building and maintaining projects for third parties, the company co-owns a similar-sized asset commissioned last year in Kagoshima Prefecture.
