- Record tandem solar cell efficiency of 35.5% certified by ESTI.
- Named among 15 companies on S&P Global Energy Tier 1 Cleantech list.
- Results reinforce pathway to high efficiency solar deployment at scale.
LONGi has reported a new world record in solar performance while also strengthening its global market position with fresh industry recognition.
LONGi has announced that its crystalline silicon perovskite tandem solar cell has reached a conversion efficiency of 35.5%, setting a new world record. The result was certified by the European Solar Test Installation and unveiled at the 2026 Solar and Energy Storage Innovation Conference. The result marks a further step forward for tandem technology, which offers a theoretical efficiency ceiling of up to 43%, well above the 33.7% limit for single junction cells.
LONGi has steadily improved performance over recent years, lifting efficiency from 33.9% in November 2023 to 34.6% in June 2024, and now to 35.5% following a series of incremental gains. Earlier in 2026, its 35.2% two terminal tandem cell was included in the 68th edition of the Solar Cell Efficiency Tables compiled by Professor Martin Green and his team at the University of New South Wales.
The company has also demonstrated progress under conditions closer to commercial scale. Efficiencies of 34.3% on a 261 cm² cell and 32.2% on a 274 cm² cell were recorded, while tandem modules achieved 31.4% and 29.4%, with independent certification. These results point to improving prospects for industrial deployment.
Related news: LONGi reaches mass production of high efficiency ACM solar cells
In parallel with its technology progress, LONGi has been named to the 2026 S&P Global Energy Tier 1 Cleantech Companies list, marking its second consecutive year of inclusion. The list identifies leading suppliers across solar PV modules, inverters, energy storage systems, battery cells, and wind turbines, based on criteria including market share, manufacturing scale, financial performance, and sustainability.
Only 15 companies globally were selected in the category, with S&P Global Energy highlighting the depth of its assessment methodology, which combines market data with financial and sustainability indicators. The list is presented as a group of qualified companies rather than a ranking.
For LONGi, the recognition provides independent validation of its market position and reliability for investors, developers, and project partners. It also reflects the growing importance of sustainability and supply chain transparency as core evaluation criteria in the clean energy sector.
The company continues to position itself through a structured research and development model focused on technologies in production, development, and reserve, as it seeks to support global energy transition efforts with higher efficiency solar solutions.
Author: Bryan Groenendaal
