LONGi

LONGi Green Energy Technology

Native name	隆基绿能科技股份有限公司 (Chinese)
Formerly	Xi'an LONGi Silicon Materials Corporation
Traded as	CSI A50
ISIN	CNE100001FR6
Industry	Photovoltaics
Founded	14 February 2000
Founder	Li Zhenguo
Headquarters	Xi'an, Shaanxi
Key people	Baoshen Zhong, (Chairman) Li Wenxue (Vice-President) Li Zhenguo (President)
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LONGi Green Energy Technology Co. Ltd. (), also known as LONGi Group (), previously operating as Xi'an Longi Silicon Materials Corporation, is a prominent Chinese firm in the photovoltaics sector, recognized as a top manufacturer of solar modules and a developer of solar power initiatives.

As the leading global producer of monocrystalline silicon wafers, LONGi is publicly traded on the Shanghai Stock Exchange.

History

Established on 14 February 2000 by Li Zhenguo and originally named , the company's headquarters are situated in Xi'an, Shaanxi province. In February 2017, following the acquisition of LERRI Solar, the firm rebranded to its current name, removing "Xi'an" to signify its broadened manufacturing capabilities.

In early 2016, LONGi finalized a $1.84 billion contract for solar panel sales with SunEdison Products Singapore and took ownership of SunEdison's silicon production facility in Malaysia, enhancing both its supply chain and manufacturing scale.

By early 2018, LONGi announced plans to establish a new module assembly plant with a capacity of 5 GW in Anhui province, China. This project involved an investment near RMB 1.95 billion (approximately US$300 million) and aimed to expand production within an estimated timeframe of 28 months.

In 2023, the U.S. Department of Commerce concluded that Vina Solar, a subsidiary of LONGi, had bypassed tariffs imposed on Chinese solar products.

Amid market shifts in 2024, LONGi declared intentions to reduce its workforce by around 30% to mitigate excess production capacity. That same year, the European Commission initiated an inquiry into LONGi regarding purported anti-competitive subsidies within the solar industry.

Subsidiaries and acquisitions

• LERRI Solar Technology Co., Ltd., also referred to as LERRI Photovoltaic Technology or LERRI Solar, was acquired by LONGi in 2014.
• LONGi Solar

Operations

LONGi Silicon Materials focuses on the innovation, production, and distribution of monocrystalline ingots. It holds the distinction as the largest manufacturer worldwide of monocrystalline silicon and has achieved three global solar efficiency records within a five-month period. The company was recognized by Fast Company in 2013 as one of the "Most Innovative Companies" due to its ability to supply premium silicon wafers at competitive prices. Its subsidiary, LONGi Solar, attained a record conversion efficiency rate of 23.6% with P-type monocrystalline PERC solar cells—a technology that has gained widespread adoption internationally.

The PERC process entails cutting silicon wafers into thin slices that are then rotated to reveal fresh surfaces. This increases the silicon surface area and enables bifacial cell functionality—allowing energy capture from both the front and back sides—thereby improving overall efficiency.

LONGi Silicon is a member of the Silicon Module Super League (SMSL), an alliance comprising leading crystalline silicon module suppliers such as Canadian Solar, Hanwha Q CELLS, JA Solar, Jinko Solar, Trina Solar, and GCL.

Since April 2012, LONGi has been listed on the Shanghai Stock Exchange under the ticker code 601012. It is acknowledged as one of the fastest-expanding photovoltaic manufacturers globally. Revenue grew substantially from approximately US$330 million in 2013—derived exclusively from monocrystalline silicon wafers—to roughly US$1.67 billion in 2016. This represented an increase of nearly 94% compared to 2015, which itself experienced growth of about 61%.

The company maintains manufacturing facilities across Mainland China, India, and Malaysia and has acquired plants from other entities including American manufacturer SunEdison. Additionally, LONGi is evaluating prospects for establishing production operations within the United States in response to evolving trade policies.

Products

• P-type and N-type Mono-crystalline silicon wafer
• Mono-crystalline ingots of P-type and N-type
• Bifacial solar cells