The Ministry of Commerce is expected to issue a preliminary ruling on those investigations on Feb 20, the 21st Century Business Herald has reported.

Business insiders are expecting the introduction of 20 percent duties on polysilicon products from these countries, China Business News reported on Wednesday.

Shares in Chinese polysilicon makers have bounced back recently, based on the expectation of increased business as a result.

Daqo New Energy Corp, for instance, has risen 64 percent, and GCL Poly Energy Holdings Ltd 44 percent over the past month.

Domestic polysilicon producers are considered less competitive than their overseas counterparts.

The average costs for Chinese companies range from $40 to $50 per kilogram, almost twice the cost of the more advanced foreign products.

Imports account for more than 60 percent of the Chinese market, up from 45 percent in 2011, Securities Times said.

The Central Economic Work Conference held in mid-December noted that several industries in China, including polysilicon manufacture, are suffering from "obvious oversupply", and urged restructuring efforts to cut excess production capacity, and for resources to be concentrated on companies with better technology and management.

In November, the country's largest utility company, the State Grid Corp, launched a free service that allows PV solar power producers to connect to the national grid, a move considered "very encouraging" by industry experts.

According to the new policy, State Grid branches at city level will have the right to approve small-scale, self-supporting distributed solar power plant projects with installed capacities of less than 10,000 kilowatts to be connected to the grid.

"I believe the future is bright. But the process will be painful," said Xue.

xieyu@chinadaily.com.cn