China Energy Investment Corp (CHN Energy) has completed construction of its Guohua Rudong solar-hydrogen-storage integrated project in Jiangsu province, marking another step in China’s efforts to combine large-scale solar generation with battery storage and green hydrogen production.
The project is located in the Yudong reclaimed tidal-flat area near Yangkou Port in Rudong county, Nantong. It is operated by the Jiangsu branch of Guohua Investment, a CHN Energy subsidiary. The company describes it as China’s largest integrated solar-hydrogen-storage project.
The facility includes a 400 MW coastal PV plant, a 60 MW/120 MWh battery energy storage system, a green hydrogen production facility with a capacity of 1,500 Nm³ per hour, and a 220 kV shore-based substation. It also features hydrogen refueling capacity of 500 kg per day.
According to CHN Energy, the PV plant is expected to generate about 468 GWh of electricity annually, enough to meet the yearly power demand of nearly 200,000 households. The hydrogen facility is designed to produce 482 tons of high-purity green hydrogen per year.
The project reached its first grid-connection milestone in early 2025. Its 400 MW PV section achieved full-capacity grid connection on April 29, 2025. CHN Energy said the integrated project was completed on June 10, 2026, following system-wide joint commissioning, with performance indicators meeting design specifications.
The hydrogen production facility remains in the final stage of equipment commissioning and is expected to begin operations in August 2026, according to the company. Once operational, the project will establish an integrated system linking renewable power generation, energy storage, hydrogen production and downstream hydrogen use.
A dedicated submarine cable connects the PV plant directly to the hydrogen production facility. During periods of high solar generation, surplus PV electricity can be supplied to the electrolyzer without first passing through the public grid. Local project operators said that, at full PV output, approximately one-fortieth of the plant’s hourly generation is sufficient to operate the hydrogen facility at full load.
The battery energy storage system is designed to smooth fluctuations in PV output and provide a stable power supply for hydrogen production. The configuration is intended to increase local consumption of renewable electricity while serving as a demonstration of renewable hydrogen production directly coupled with coastal PV generation.
The project also incorporates coastal ecological restoration measures. CHN Energy said the development occupies about 2.9 km2 of tidal-flat land and was implemented alongside a broader Spartina alterniflora control and coastal wetland restoration program covering approximately 4.3 km2.
The project is part of China’s third batch of large-scale wind and solar power bases. Its significance lies not only in its 400 MW PV capacity but also in its integrated operating model, combining coastal solar generation, battery storage, traceable green hydrogen production and local hydrogen consumption within a single commercial demonstration project.
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