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The company’s chief financial officer, W.G. Stover Jr., said in bankruptcy filings that Solyndra’s collapse was fueled by, among other things, an oversupply of solar panels. He blamed the oversupply on expanding capacity by foreign solar-panel manufacturers that “utilized low-cost capital provided by their governments to expand operations,” according to court records.

“In response, Solyndra was forced to reduce its average selling prices to remain competitive,” Mr. Stover explained in a 56-page court filing.

Within days of the company’s bankruptcy announcement, a spokesman for the Energy Department released a statement saying the loan-guarantee program was pursued by the Bush and Obama administrations.

But the House Energy and Commerce Committee, which had been investigating the Solyndra loan deal months before the company’s bankruptcy, is pressing to find out if the Obama administration, which awarded the loan package, ignored signs of the company’s financial troubles and played politics in awarding the loan guarantees to Solyndra.

“There is much to learn as the investigation moves forward, and it is imperative that American taxpayers are not paying the price for the sins of Solyndra,” Rep. Fred Upton, Michigan Republican, said in a joint statement this month with Rep. Cliff Stearns, Florida Republican, after the FBI raid.

Mr. Upton is chairman of the House Energy and Commerce Committee, and Mr. Stearns is chairman of its oversight and investigations subcommittee

The biggest investor in Solyndra is Argonaut Ventures, which is tied to Oklahoma billionaire George Kaiser, a fundraiser for Mr. Obama’s 2008 presidential campaign.

Adding to the scrutiny, reports surfaced Monday that Rep. Lamar Smith, Texas Republican and chairman of the House Judiciary Committee, cited the involvement of Argonaut in a letter to Attorney General Eric H. Holder Jr. asking him to appoint an independent examiner to investigate the company’s loan deal.

Meanwhile, Rep. Henry A. Waxman of California and the committee’s ranking Democrat, called on Republicans to seek the testimony of representatives of Argonaut and another big investor in Solyndra, Madrone Capital Partners, at an upcoming hearing. At a House committee hearing on Solyndra last week, Mr. Waxman cited ties Madrone has to Wal-Mart’s Walton family, which he noted backs Republicans.

After questioning Obama administration officials last week, the House Energy and Commerce Committee plans to hold another hearing Friday titled “From DOE Loan Guarantee to Bankruptcy to FBI Raid: What Solyndra’s Executives Knew,” in which company officials are expected to testify.

Solyndra executives likely will be well-prepared by McDermott Will & Emery.

Before Solyndra went bankrupt, the company had hired the law firm “with respect to responding to congressional investigations,” Mr. Ransom said in an affidavit, which was filed recently in the company’s bankruptcy case in Delaware.

Mr. Ransom called the rates for Mr. Weld and others “standard hourly rates for work of this nature.”

“These rates are set at a level designed to fairly compensate the firm for the work of its attorneys and paralegals and to cover fixed and routine overhead expenses,” he wrote.