Making Room for Batteries in Japan: The Need for Regulatory Evolution
The large-scale deployment of battery energy storage systems (BESS) is technically essential for enabling renewable energy to function as a primary power source in modern power systems. However, implementation has progressed more slowly than required, largely due to limited economic viability under current market mechanisms. From a system engineering perspective, storage plays a critical role in maintaining frequency stability, balancing supply and demand, mitigating variability, and enhancing overall system resilience. As renewable penetration increases and system inertia declines, the need for fast-response resources such as BESS becomes increasingly urgent, including from an energy security standpoint.
This presentation provides an overview of the current situation in Japan, including market and operational frameworks relevant to storage deployment. It further examines recent technical challenges associated with high renewable penetration—such as frequency control, reserve management, and system stability—and discusses emerging operational strategies and technological trends in storage integration and grid support functions.