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That means the unit of the Atlanta-based Southern Co. can start loading radioactive fuel into the reactor once it completes construction documentation and gets approval from the U.S. Nuclear Regulatory Commission.
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Units 3 and 4 at Plant Vogtle are the first new reactors built from scratch in decades in the United States. The first two reactors have been generating electricity at Vogtle for decades. A third and a fourth reactor were approved for construction at Vogtle by the Georgia Public Service Commission in 2009, and the third reactor was supposed to start generating power in 2016.
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Georgia Power owns a minority of the two new reactors. The remaining shares are owned by Oglethorpe Power Corp., the Municipal Electric Authority of Georgia, and the city of Dalton. Oglethorpe and the Municipal Electric Authority of Georgia would sell power to cooperatives and municipal utilities across Georgia, as well in Jacksonville, Florida, and parts of Alabama and the Florida Panhandle.

Georgia Power's 2.7 million customers are already paying part of the financing cost, and state regulators have approved a monthly rate increase of $3.78 a month as soon as the third unit begins generating power. The elected Georgia Public Service Commission will decide later who pays for the remainder of the costs, including the fourth reactor.