WASHINGTON (AP) - The Energy Department on Wednesday approved two loan guarantees worth more than $1 billion for solar energy projects in Nevada and Arizona, two days before the expiration date of a program that has become a rallying cry for Republican critics of the Obama administration's green energy program.

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Energy Secretary Steven Chu said the department has completed a $737 million loan guarantee to Tonopah Solar Energy for a 110 megawatt solar tower on federal land near Tonopah, Nev., and a $337 million guarantee for Mesquite Solar 1 to develop a 150 megawatt solar plant near Phoenix.

The loans were approved under the same program that paid for a $528 million loan to Solyndra Inc., a California solar panel maker that went bankrupt after receiving the money and laid off 1,100 workers. Solyndra is under investigation by the FBI and is the focal point of House hearings on the program.

SolarReserve LLC, of Santa Monica, Calif., the parent company for Tonopah, is privately held. The Energy Department said its rules prevented it from discussing the company's financial information. Sempra Energy of San Diego, which owns Mesquite, is publicly held.

Energy Department spokesman Damien LaVera said the two projects had extensive reviews that included scrutiny of the parent companies' finances.

Chu said the Nevada project would produce enough electricity to power more than 43,000 homes, while the Arizona project would power nearly 31,000 homes. The two projects will create about 900 construction jobs and at least 52 permanent jobs, Chu said.

"If we want to be a player in the global clean energy race, we must continue to invest in innovative technologies that enable commercial-scale deployment of clean, renewable power like solar," Chu said in a statement.

Senate Majority Leader Harry Reid, D-Nev., is a strong supporter of the Nevada project, which he says will help his state's economy recover. Former Gov. Jim Gibbons, a Republican, also supported the project.

The loan approvals came just two days before a renewable energy loan program approved under the 2009 economic stimulus law is set to expire. At least seven projects worth more than $5 billion are pending.

Rep. Cliff Stearns, R-Fla., chairman of a House energy subcommittee that is investigating Solyndra, said the impending deadline was no reason to complete loans before they are ready.

"Solyndra was the product of a bad bet rushed out the door, and taxpayers are now on the hook," he said. "We cannot afford DOE rushing out more Solyndras in these final hours."

A government watchdog group said the Solyndra bankruptcy shows the need for greater oversight of all the department's loan guarantee programs.