Tokyo Century Launches Next-Generation Solar PPA Demonstration in Snow-Prone Region of Japan

Tokyo Century has launched a demonstration project utilizing next-generation flexible solar technology under an on-site power purchase agreement (PPA) model in Myoko, aiming to explore new pathways for renewable energy deployment in heavy snowfall regions across Japan.

The project uses lightweight “chalcopyrite solar cells” developed by PXP, a technology company in which Tokyo Century holds an equity stake. The demonstration is scheduled to continue through April 2028 and focuses on evaluating equipment durability, installation performance, and power generation efficiency under snow-heavy climate conditions.

The solar system has been installed on the roof of the Myoko Clean Center, a municipal waste treatment facility in Myoko City. According to the project partners, the facility’s curved roof structure posed major challenges for traditional glass-based solar modules due to weight and installation limitations. However, the chalcopyrite solar cells used in the project are approximately 0.8 millimeters thick, lightweight, and flexible enough to conform to curved surfaces.

JFE Engineering provided technical support for the installation, while its subsidiary Urban Energy signed the PPA agreement with Myoko City. Electricity generated from the system will be supplied to public facilities within the municipality, including the Myoko Clean Center itself.

The project has a generation capacity of 4.94 kW and is described as the largest initiative under Niigata Prefecture’s next-generation battery and solar demonstration support framework. Part of the installation cost is being subsidized by the prefectural government.

According to the participating companies, the project represents Japan’s first municipal-government PPA initiative using chalcopyrite solar cells. The partners noted that conventional solar deployment in snowy regions has historically faced limitations due to reduced winter generation efficiency and structural stress caused by snow accumulation on rooftops.

The lightweight nature of the new-generation modules — weighing approximately 0.8 kilograms per square meter — was identified as a key advantage for reducing structural load pressure during winter conditions. Stakeholders also highlighted the technology’s potential suitability for rooftops and surfaces where traditional rigid solar panels are difficult to deploy.

During the demonstration period, the companies will monitor generation output, equipment durability, installation stability, and snow impact conditions. Tokyo Century stated that the long-term objective is to establish a scalable PPA model that could support renewable energy deployment across snow-prone regions and structurally complex buildings throughout Japan.