On September 24, the Bureau of Ecology and Environment of Yiwu City, Zhejiang Province, issued the " Yiwu Aixu No.4 Factory 5G W High-efficiency Crystalline Silicon Battery Technical Reform Project Eco-environmental Impact Assessment (Draft for Comments) Public Participation Information Announcement".
The announcement shows that the existing project of the enterprise is 20GW high-efficiency battery technology renovation project (Phase I project), with a total capacity of 13 GW/a TOPCon/TOPCon + solar cells per year.
Yiwu Aixu No.4 Plant invested 846.2 million yuan in the 5G W high-efficiency crystalline silicon battery technical transformation project. Aixu Co., Ltd. has carried out technical transformation on the equipment and process of the four factories, and formed an annual production capacity of 5G W high-efficiency N-type crystalline silicon solar cells.

Previously, on March 30, Yiwu Eco-environment Branch also issued the "Yiwu Aixu No.4 Factory 5GW High-efficiency Crystalline Silicon Battery Technical Reform Project Environmental Impact Assessment Public Participation Information Announcement". According to the public announcement
at that time, the investment amount and construction location of the 5GW high-efficiency crystalline silicon battery technical transformation project of Yiwu Aixu No.4 Factory were the same as those of the public announcement in September: the investment amount was 846.2 million yuan, and the location was the No.4 Battery Factory in 1 # Park of Zhejiang Aixu Yiwu Production Base.
However, the construction content announced in March is that the project will upgrade the original PERC technology production line with the advanced technology of full-back contact and full-back passivation, and finally realize the annual production of 5G W N-type ABC high-efficiency crystalline silicon battery manufacturing plant .

Earlier, on March 13, 2024, Aixu announced that it planned to upgrade the existing 25GW PERC battery capacity of Yiwu Base in Zhejiang Province to TOPCon battery capacity, with an estimated total investment of 2.715 billion yuan. The renovation project is scheduled to start in April 2024 and put into operation in the second half of 2024. On April 17
, 2026, Aixu announced that the board of directors of the company agreed to terminate the implementation of the TOPCon project of Yiwu PERC battery capacity technology reform, and that the capacity that has not been reformed will no longer be implemented. The existing battery capacity of the fourth factory of Yiwu Base will be upgraded to 5G WABC battery capacity .
In another announcement on April 17, Aixu disclosed the technical renovation project of 5GW high-efficiency crystalline silicon battery in Yiwu Aixu No.4 Factory, and announced that the technical renovation project was scheduled to start in the second quarter of 2026 and put into operation in the third quarter.
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