WASHINGTON — A Silicon Valley maker of solar power arrays that was started with high hopes and $527 million in loans from the federal government said on Wednesday that it would cease operations. The failure of the company — and the loss to taxpayers — is likely to renew the debate in Washington about the wisdom of clean energy subsidies and loan guarantees.

President Obama praised the company, Solyndra, for its advanced technology during a visit last year. But in a statement on Wednesday, Solyndra said its business had run into trouble because of difficult global business conditions, including slowing demand for solar panels, and stiff competition.

The Energy Department, which approved the funding, said China’s subsidies to its solar industry were threatening the ability of Solyndra and other American manufacturers to compete. The price of a solar array, measured by cost per watt of capacity, has fallen 42 percent since December 2010, the agency said.

Two other American solar companies, Evergreen Solar and SpectraWatt, also sought bankruptcy protection in August, and both said competition from Chinese companies had contributed to their financial problems.