By Alicia Mundy and Rebecca Smith 

Federal officials have finalized a long-awaited loan guarantee for $6.5 billion, which will help a utility in Georgia bring the first new nuclear reactor in the U.S. on line in decades.

The deal announced Wednesday by Secretary of Energy Ernest Moniz, signals White House support for nuclear power, though the loan guarantee has been under review since 2010. "The president wants to make clear that he sees nuclear energy as a part of his carbon-free portfolio," said Mr. Moniz.

The nuclear reactors at the Vogtle plant site in Waynseboro, located in eastern Georgia near Augusta, represent the "next generation of reactors with passive safety features" that require less operator intervention to keep them safe, Mr. Moniz said.

Some of Mr. Obama's allies in the environmental lobby, many of whom support and contributed to his re-election in 2012, oppose the use of nuclear energy because of safety concerns. Mr. Obama, though, has included nuclear power as part of his "all of the above" strategy that includes a wide mix of fuels.

The Union of Concerned Scientists and other groups such as Friends of the Earth have expressed opposition to the loan guarantees, concluding they subsidize the wrong kind of electricity. They have become even more concerned since the March 2011 accident at the Fukushima Daiichi reactors in Japan.

The two new Vogtle reactors being built by Southern Co.'s Georgia Power Co. unit will receive up to $8.3 billion in loans to be furnished by the Federal Financing Bank. That includes $6.5 billion in federal loans and loan guarantees to two of the companies that will own the plant, Georgia Power and Oglethorpe Power Corp. A third partner, the Municipal Electric Authority of Georgia, has won conditional approval to receive up to $1.8 billion in federal assistance.

Southern spokesman Tim Leljedal said the company's borrowings will be secured by the reactors.

Federal guarantees are new to the U.S. nuclear power industry. In the last construction cycle, which hit the skids following the nuclear accident at the Three Mile Island plant in Pennsylvania in 1979, utilities and their customers were exposed to cost overruns and losses. This time around, the power industry lobbied for guarantees so utilities could protect their customers and shareholders from potential losses.

Few nuclear plants are under construction in the U.S. because the economics have moved against the costly, lengthy projects. Nuclear plants look expensive compared with gas-fired plants that can burn inexpensive natural gas from the nation's many shale plays.

In an earnings call last month, Southern Co. Chief Executive Tom Fanning said the guarantees will save Georgia Power customers approximately $200 million, by reducing the financing cost of the twin reactors, in the works since 2006.

Georgia Power, in a report filed with Georgia utility regulators in January, said its majority share of the project will cost $4.8 billion or $381 million more than the amount approved by state regulators. State officials don't have to approve the sums spent by the other utilities.

The two reactors are the first of a new generation of reactor designs approved by the U.S. Nuclear Regulatory Commission. Southern expects its first unit to be in service in early 2018 and the second unit a year later. One other utility, Scana, is building reactors of the same design type--called the Westinghouse AP 1000--in South Carolina.

Write to Alicia Mundy at alicia.mundy@wsj.com and Rebecca Smith at rebecca.smith@wsj.com

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