On July 30, Okinawa Electric Power Company announced the official launch of commercial operations for the large-scale energy storage station at the Miyakojima Second Power Plant. With a capacity of 12MW/48MWh, this facility stands as the largest energy storage project in Okinawa Prefecture and across Japan’s remote islands. The station is powered entirely by Gotion High-tech’s advanced 3.42MWh liquid-cooled energy storage systems.

Solving Miyakojima’s Energy Challenges

Miyakojima’s isolated grid has historically relied on diesel generators, which are constrained by costly and logistically challenging fuel transportation. The increasing integration of renewable energy has further exacerbated grid instability. To address these issues, Gotion High-tech deployed its cutting-edge energy storage solution.

Innovative Technology for Superior Performance

The system utilizes Gotion’s proprietary lithium iron phosphate batteries, renowned for their high safety, ultra-long cycle life, and exceptional charge/discharge efficiency. Paired with Gotion’s self-developed battery management system (BMS), the solution enables real-time monitoring, overcharge/discharge protection, and stable operation. The system also features multi-layered safety mechanisms and an intelligent liquid-cooling design, boosting energy efficiency by approximately 30% compared to traditional air-cooling methods. Its modular containerized structure ensures effortless installation and maintenance, fully complying with Japan’s rigorous safety and environmental standards.

Strengthening Grid Stability and Renewable Integration

Once operational, the storage station stores surplus electricity from photovoltaic systems and diesel generators during the day, discharging it during peak nighttime demand. It delivers up to 12MW of supplemental power—equivalent to 15% of the island’s total supply capacity. This not only eases pressure on the isolated grid but also optimizes renewable energy utilization, enhancing the island’s energy security and resilience.

A Benchmark for Sustainable Energy Development

On-site, the sleek energy storage units harmonize with Miyakojima’s picturesque coastline, embodying the synergy between green energy and ecological preservation. As Okinawa’s largest operational energy storage facility, the project sets a new standard for combining renewable energy with environmental sustainability. Given the shared energy challenges of remote islands, Miyakojima’s success provides a scalable blueprint for Okinawa’s broader energy transition, positioning the region as a pioneer in clean energy adoption.

Moving forward, Gotion High-tech will deepen its footprint in Japan’s energy storage market, exploring diverse applications such as renewable integration, frequency regulation, electricity spot markets, and virtual power plants. The company remains dedicated to delivering safe, efficient, and economical solutions to accelerate Japan’s energy transformation.