The Energy Department kept Treasury Department officials in the dark until late in the government's review of the $535 million loan to now-bankrupt solar panel maker Solyndra, triggering a rushed consultation that may have left concerns unresolved, a new audit released Wednesday found.

The audit by the Treasury Department’s inspector general found that Treasury officials had raised serious concerns about the terms of the loan, but there was no documentation of whether they were addressed. The report’s findings of hurried reviews and ignored warning signs echo previous iWatch News reporting on Solyndra.

The loan, originally touted as a model of President Obama’s green energy program, has become a political weapon. “The Treasury report echoes what our investigation has shown over and over; Solyndra was a bad bet from the beginning that was rushed out the door while every red flag was ignored,” Republican Reps. Fred Upton and Cliff Stearns said in a statement Wednesday.

Though the Energy Department arranged the loan, it was actually processed by the Federal Financing Bank, a government lending institution under Treasury’s control. The newly released audit found that Treasury was not involved in the process until the loan negotiations were largely complete.

Treasury officials raised concerns about the terms of the loan, including the fact that it included a 100 percent guarantee, rather than a partial guarantee, auditors found. After a conference call with Energy Department officials, one Treasury official wrote, in an email uncovered by auditors, “we pressed on certain issues … but the train really has left the station on this deal.”

The Department of Energy was fully aware of the risks in backing Solyndra Inc., a start-up company that pocketed a half-billion dollar DOE loan but never turned a penny in profit before shutting its doors, concludes a former FBI agent hired to examine the company’s books.

The expert’s report, filed this week in Solyndra’s voluminous bankruptcy case in California, could embolden critics who say the government ignored financial red flags in supporting the solar panel maker with President Obama’s maiden green energy loan in 2009.

The $535 million loan, which bankrolled a vast new manufacturing plant in Fremont, Calif., was part of a broad government mission to kick-start the clean energy movement: Solyndra’s unique solar panels would cover commercial rooftops across the country, aiding the environment and boosting the economy.

Yet the company collapsed under a sea of debt and a business plan that, amid dramatic shifts in the global solar market, caused it to sell far fewer panels at far higher costs than envisioned. From 2009-11, it cost Solyndra $3.92 more per watt to make its panels than to sell them, the bankruptcy report shows.

Solyndra filed for bankruptcy Sept.6, 2011. Two days later, it faced a raid by agents from the FBI and the Energy Department inspector general. With those clouds looming, the company’s board hired R. Todd Neilson — the former federal agent and veteran trustee in bankruptcy cases — as chief restructuring officer.

Solyndra’s board wanted a CRO to not only manage its bankruptcy case, but to explore whether the company committed misdeeds on its road to collapse. “In light of the Federal criminal investigation and ongoing Congressional investigation … the Subcommittee agreed that the CRO would act in an independent capacity in determining if any improprieties had occurred with respect to the Debtors’ finances,” Neilson’s report said.