The outcome has left even the architects of China’s renewable energy strategy feeling frustrated and eager to see many businesses shut down, so the most efficient companies may be salvageable financially.

In the solar panel sector, “If one-third of them survive, that’s good, and two-thirds of them die, but we don’t know how that happens,” said Li Junfeng, a longtime director general for energy and climate policy at the National Development and Reform Commission, the country’s top economic planning agency.

Mr. Li said in an interview that he wanted banks to cut off loans to all but the strongest solar panel companies and let the rest go bankrupt. But banks — which were encouraged by Beijing to make the loans — are not eager to acknowledge that the loans are bad and take large write-offs, preferring to lend more money to allow the repayment of previous loans. Many local and provincial governments also are determined to keep their hometown favorites afloat to avoid job losses and to avoid making payments on loan guarantees, he said.

Mr. Li’s worries appear to be broadly shared in Beijing. “For the leading companies in the sector, if they’re not careful, the whole sector will disappear,” said Chen Huiqing, the deputy director for solar products at the China Chamber of Commerce for Import and Export of Machinery and Electronic Products.

The Chinese government also wants to see the country’s more than 20 wind turbine manufacturers, many of which are losing money, consolidate to five or six. “Wind does not need so many manufacturers,” said Mr. Li, who in addition to drafting renewable energy policies is the president of the Chinese Renewable Energy Industries Association.