The Georgia Public Service Commission on Thursday is set to decide the fate of Plant Vogtle, the only nuclear reactor under construction in the U.S., which is years behind schedule and billions of dollars over budget. At Thursday’s hearing, a commission made of five elected officials, all Republicans, will vote on whether to permit Georgia Power’s new plan for the project, which includes an updated cost projection and construction timeline, or to cancel it. Georgia Power is estimating $12.2 billion in costs for its 45.7 percent share of the project, and for the reactors to be producing electricity by 2021...