Recently, the internationally authoritative testing and certification body RETC released its 2025 PV Module Index Report. LONGi was honored with the "Overall Highest Achiever" award for the seventh consecutive year, recognizing its outstanding performance across three key dimensions: reliability, performance, and manufacturing quality.
RETC (Renewable Energy Test Center), based in the United States, is a globally leading independent engineering services and certification testing body for photovoltaic (PV) and renewable energy products. Annually, it subjects module products from major PV manufacturers to rigorous testing based on three core dimensions: Reliability, Performance, and Quality.
RETC's testing standards far exceed IEC certification requirements, representing a more rigorous evaluation process that delivers a comprehensive assessment of module product performance. The test results are compiled into its authoritative annual publication, the PV Module Index Report (PVMI).
Among its various awards, the "Overall Highest Achievers" award is RETC's highest honor bestowed upon module manufacturers. This accolade has an exceptionally high threshold, requiring recipients to simultaneously achieve high standards across all three dimensions: "Module Reliability," "Performance," and "Manufacturing Quality."
Historically, only a handful of companies have managed to meet all these demanding criteria. LONGi's achievement of winning this prestigious award for the seventh consecutive year powerfully demonstrates its exceptional capabilities in PV module R&D, manufacturing processes, and quality control.
According to the report, only 13% of the total modules evaluated this year met RETC's rigorous testing standards. However, LONGi, demonstrating its robust product strength, achieved outstanding results across multiple critical test categories. In Reliability Testing: LONGi modules earned various awards in key indicators including DH (Damp Heat), PID (Potential Induced Degradation), TC (Thermal Cycling), and SDML (Static & Dynamic Mechanical Load). In High-Performance Testing: LONGi secured the top "Overall Highest Achievers" rating in core projects such as LETID (Light and Elevated Temperature Induced Degradation), LID (Light Induced Degradation), TEMP COEFFICIENT (Temperature Coefficient), and PAN FILE (Simulation Data File Performance).
LONGi's exceptional performance in RETC testing for seven consecutive years since 2019 not only underscores its unwavering commitment to product reliability and quality but also highlights its pioneering role in driving high-quality development within the global PV industry.
About LONGi
Founded in 2000, LONGi is committed to being the world’s leading solar technology company, focusing on customer-driven value creation for full scenario energy transformation.
Under its mission of 'making the best of solar energy to build a green world', LONGi has dedicated itself to technology innovation and established five business sectors, covering mono silicon wafers cells and modules, commercial & industrial distributed solar solutions, green energy solutions and hydrogen equipment. The company has honed its capabilities to provide green energy and has more recently, also embraced green hydrogen products and solutions to support global zero carbon development. www.longi.com/