Guolian will inject its solar and other businesses into Suntech, the company said. Guolian said it has net assets of $2.6 billion, including investments in solar, power generation, textiles, waste disposal and environmental protection.
There will be "substantial dilution" for existing shareholders but the move should rebuild Suntech's operating assets and global brand, said CEO Zhou Weiping.
"Even though the investment letter of intent is indicative only and is not a firm commitment, this is an important step in the restructuring of the company with key stakeholders," Zhou said in the statement. He gave no other details.
Guolian bid for Wuxi Suntech but lost out to another company, Jiangsu Shunfeng Photovoltaic Technology Co. That deal awaits court approval.
Suntech's financial trouble was a dramatic reversal for a company that was a leading force in China's fast-growing renewable energy industry.
Its founder, Shi Zhengrong, was lauded by the Chinese press but has seen much of his multibillion-dollar fortune evaporate.
Chinese solar panel makers, which export most of their production, have been hurt by higher import duties imposed by the United States and Europe over complaints Beijing improperly subsidizes the industry.
China retaliated last July by raising import tariffs on U.S.- and Korean-made polysilicon used to manufacture them and launching a trade investigation of European wine that could lead to higher duties.
Suntech also has faced trouble in Italy over investments there. Italian courts have ordered the seizure of 37 solar projects that received investment from Global Solar Fund SCA, of which Suntech owns 88 percent. Suntech lawyers believe that Global Solar used bonds that never existed as collateral in a partnership deal with the Chinese solar-power company.