【Press Release】Bison Energy and Engelhart Sign Heads of Terms for Japan’s First 10-Year Revenue Floor Agreement for Battery Storage

Tokyo, Japan – July 3, 2025 – Bison Energy, K.K. (“Bison Energy”), a leading developer and integrator of Photo-Voltaic (PV) and utility-scale Battery Energy Storage Systems (BESS) has signed the Heads of Terms for a landmark 10-year revenue floor agreement with Engelhart CTP GK (“Engelhart”), a global energy trading and asset optimization leader. The first-of-its-kind deal, executed through Bison’s asset-holding subsidiary, marks a major milestone in Japan’s transition to a flexible, low-carbon energy system.Bison Energy aims to establish a long-term guaranteed revenue structure for utility-scale battery storage projects. Under the deal, Bison Energy —through its wholly owned asset holding subsidiaries —will receive a fixed minimum revenue for its BESS assets, while also participating in upside sharing when market conditions exceed floor levels. The structure is designed to provide predictable cash flow while capturing potential market upside. Engelhart, leveraging its experience managing large-scale BESS portfolios in deregulated power markets across Europe, will provide trading and optimization services for the assets. Its team will oversee real-time asset dispatch, charge/discharge strategy, and revenue maximization tailored to Japan’s power market design.  

“This structure provides the financial certainty developers and investors need to accelerate BESS deployment in Japan,” said Michael Zhang, CEO at Bison Energy. “It unlocks a scalable path to decarbonization by combining long-term stability with tactical flexibility — and we’re proud to be the first to bring this innovation to the Japanese grid, ” said Munenori Horie, VP of Power Trading at Bison Energy. “This agreement marks an important step in bringing long-term revenue certainty to battery storage projects in Japan,” said Ante Pogacic, Head of Renewables, EU Power & Gas at Engelhart, “By combining Bison’s development expertise with our trading and optimization capabilities, we’re creating a model that supports investment, unlocks market value, and accelerates the role of storage in Japan’s energy transition.” 

Bison Energy is targeting over 2.4 GW / 10 GWh of utility-scale BESS capacity in Japan by 2030. The Company was awarded 240 MW across 3 projects in the second round LTDA auction, for a total of 1GWh of capacity. The partnership with Engelhart marks a new chapter in unlocking project bankability and accelerating market adoption on its project portfolio.