Japan’s energy storage capacity received a significant boost as Manoa Energy announced the commencement of commercial operations for the Helios 50 MW Battery Energy Storage System (BESS) in Sapporo City, Hokkaido.
Developed through a partnership between Brawn and HD Renewable Energy Japan (HDJP), the Helios project marks Manoa Energy’s first standalone Extra High Voltage (EHV) storage asset. The system has a rated capacity of 50 MW / 104 MWh, strengthening Japan’s growing clean energy and grid stability infrastructure.
Brawn’s Japan-based development platform, Manoa Energy, led the project, which began construction in April 2024. The installation is equipped with Tesla Megapack 2XL battery units, while HOKKAIDENKO Corporation handled the Engineering, Procurement and Construction (EPC) responsibilities.
Scott Reinhart, CEO of Brawn, said the completion affirms the company’s long-term commitment to sustainable infrastructure investment in the region.
“Brawn will continue to develop our additional 1 GW pipeline of Extra High Voltage and High Voltage assets throughout Japan, for commercial operations between 2026 and 2030,” he stated.
The Helios BESS will operate as a 100% merchant asset, participating in Japan’s wholesale, balancing, and capacity markets. This model positions it to support the country’s broader renewable energy integration goals as demand for flexible storage solutions grows.
Dean Cooper, Head of Manoa Energy and COO of Brawn, highlighted Japan’s expanding role in the global battery storage landscape.
“Japan’s energy storage sector is experiencing rapid acceleration, positioning the country among the world’s most dynamic markets. Manoa Energy is excited to support Japan’s strategic focus on BESS as a critical part of its energy infrastructure,” Cooper said.
The Helios project is expected to enhance grid reliability in Hokkaido, a region witnessing increased renewable energy penetration, and contribute to Japan’s broader decarbonization and energy resilience efforts.
