Yingli Green Energy Holding Company Limited (Yingli Solar) manufactures solar panels. Its offerings cover the entire photovoltaic (PV) value chain, from crystalline polysilicon ingots and wafers, PV cells and PV modules to the manufacture and installation of PV systems. The company markets its products under the Yingli and Yingli Solar brands and sells them to PV system integrators and distributors across the world. Yingli Solar distributed solar PV modules of capacity more than 26 GW.

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Yingli Solar has been actively involved in various R&D initiatives, focusing on the development and application of photovoltaic (PV) technology. The company has been a leader in patent applications and authorizations in the domestic industry, with more than 85% of its patents actualized into practical applications. It has undertaken key projects such as the industrialization of bifacial power generation crystalline silicon cells and the integration of smart micro-grid technologies. The company also plays a significant role in national major project research and development, achievement incubation, technical services, talent cultivation, and international cooperation, contributing to China's competitiveness in the photovoltaic field. The R&D unit of the company is the Yingli Solar PV Technology Lab, established in 2009. This lab is responsible for basic and applied research of PV materials, solar cells, PV modules, and PV power generation systems. It provides systematic technical guidance for the introduction of raw materials, approval of new processes, and research and development of new products. The lab is accredited by the China National Accreditation Service for Conformity Assessment (CNAS) and is equipped with over 100 sets of advanced R&D and testing equipment. The company holds 2319 national patent applications, a significant number of patents, ranking 266th among China's Top 500 patent holders. The company has also been involved in drafting over 130 technical standards necessary for the photovoltaic field and has undertaken 32 national key research and development programs and provincial innovation projects.