CNNC Tianwan2 millionkW tidal flat photovoltaic demonstration project is currently China's largest offshore photovoltaic project, located in the warm water discharge area of Tianwan Nuclear Power Station in Lianyungang District, Lianyungang City, Jiangsu Province. Total investment is approximately9.88billion yuan, with a total installed capacity of2 millionkW. The project uses the nuclear power station's warm water discharge area to carry out "photovoltaic+nuclear power" multi-energy complementarity, with an average annual on-grid electricity of2.234billion kWh, annual savings of approximately680,000tons of standard coal and reduction of carbon dioxide emissions by1.77million tons. At the same time, the project uses all domestically produced equipment. As one of China's first batch of offshore photovoltaic projects submitted to the State Council for approval, and currently the country's largest three-dimensional layered sea use rights project in terms of sea area involved, it has important demonstration significance for promoting energy structure transformation and upgrading and helping achieve the "dual carbon" goals.

The Jianhua technical team established project-specific quality control standards and implemented a multi-dimensional quality control plan:To ensure product quality, during production, Jianhua strengthened testing for raw materials,concrete impermeability, chloride ions, welding materials and welding wire, and other items in response to the special nature of the project's offshore construction; during production, dedicated personnel were assigned for inspection of processes such as cage reinforcement cutting, material distribution and mold closing, and tensioning, with records kept to ensure the qualification rate of each process; considering the seawater environment, anti-corrosion treatment was carried out on steel parts such as the pile body concrete, end plates, and hoop bands of the precast piles. Before products leave the factory, each batch of products undergoes welding and bending performance testing to ensure the integrity and safety of the pile body.

Innovatively building a sea-land coordinated transportation system,on the premise of meeting engineering safety,to meet the transportation requirements of long piles,Jianhua customized special ultra-long vehicles to ensure timely and adequate supply of pipe piles. Through communication with construction units such as China Nuclear Industry 24 Construction Co., Ltd. and CCCC Second Harbor Engineering Co., Ltd., different pile lifting plans were formulated for two types of construction equipment: excavator-basedvibratory pile drivingand hammer pile driving vessels, and reinforcement measures were taken at the pile joints according to the construction method to ensure the safety of the pile joints during transportation, construction, and normal use, assisting the general contractor and construction parties in smoothly carrying out construction operations. Throughout the project service process, a professional service team was arranged to provide services to the project from different perspectives such as technology and production.

     As China's largest offshore photovoltaic project, the successful implementation of the CNNC Tianwan tidal flat photovoltaic demonstration project has important demonstration significance for promoting energy structure transformation and upgrading and helping achieve the "dual carbon" goals. Through three-dimensional layered sea use rights, composite utilization of sea areas for photovoltaic power generation is achieved. By adopting large-span grid or truss arrangement forms, the performance of its precast pile foundations far exceeds the pile types recommended in the national standard pipe pile atlas. The customized precast pile services, strict quality control, and comprehensive transportation and construction support provided by Jianhua in this project not only ensured the smooth progress of the project, but also provided valuable experience and reference for the development of offshore photovoltaic projects, promoting technological progress and industrial upgrading in China's new energy field.