Official Operation! Gotion High-tech Helps Build Japan's Largest Island Energy Storage Station

2025-08-07 | Eric

On July 30, Okinawa Electric Power Company announced the official commercial operation of the Miyakojima Second Power Plant's large-scale energy storage station. With a capacity of 12MW/48MWh, this project stands as the largest energy storage station not only in Okinawa Prefecture but also among Japan's remote islands. It exclusively utilizes Gotion High-tech's 3.42MWh liquid-cooled energy storage systems.

As an isolated grid, Miyakojima has long relied on diesel generators, facing constraints from fuel transportation and high costs. The significant increase in renewable energy adoption has further intensified challenges to grid stability and safety. To address these issues, Gotion High-tech provided its industry-leading energy storage solution. The system features self-developed lithium iron phosphate batteries, renowned for their high safety, ultra-long cycle life, superior charge/discharge performance, and eco-friendliness. Paired with a proprietary battery management system (BMS), it enables real-time monitoring of battery status, overcharge/discharge protection, and ensures stable operation. Additionally, the system employs comprehensive, multi-layered battery protection strategies and an intelligent liquid-cooling temperature control system, improving energy efficiency by approximately 30% compared to traditional air-cooling methods, guaranteeing safety and reliability. The modular containerized design simplifies installation and maintenance. After rigorous system integration and testing, it fully complies with Japan's stringent standards for safety, reliability, and environmental sustainability.

Once operational, the storage station stores excess power from photovoltaic systems and diesel generators during the day and releases it steadily during nighttime peak hours, providing up to 12MW of supplemental power—equivalent to a 15% increase in overall supply capacity. This model not only alleviates pressure on the isolated grid but also enhances renewable energy utilization, improving the island's energy security and risk resilience.

On-site, the neatly arranged energy storage systems harmonize with Miyakojima's azure seas and skies, symbolizing the coexistence of green energy and ecological beauty. As Okinawa Prefecture's largest operational energy storage station, it sets a benchmark for synergizing green energy and environmental conservation. With numerous scattered islands facing similar energy supply challenges, Miyakojima's successful project offers a replicable model for energy transition across Okinawa, positioning the prefecture at the forefront of clean energy deployment and regional sustainable development.

Moving forward, Gotion High-tech will deepen its presence in Japan's energy storage market, exploring diversified applications such as renewable energy integration, primary frequency regulation, electricity spot markets, and virtual power plants. The company remains committed to delivering high-safety, high-efficiency, and cost-effective solutions for Japan's energy transformation.

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