Southern Nuclear was first when no one wanted to be.

The nuclear subsidiary of the century-old utility Southern Company, based in Atlanta, Ga., joined a pack of nuclear companies in the early 2000s—during what was then dubbed a “nuclear renaissance”—bullish on plans for new large nuclear facilities and adding thousands of new carbon-free megawatts to the grid.

In 2008, Southern Nuclear applied for a combined construction and operating license (COL), positioning the company to receive the first such license from the U.S. Nuclear Regulatory Commission in 2012. Also in 2008, Southern became the first U.S. company to sign an engineering, procurement, and construction contract for a Generation III+ reactor. Southern chose Westinghouse’s AP1000 pressurized water reactor, which was certified by the NRC in December 2011.

Fast forward a dozen years—which saw dozens of setbacks and hundreds of successes—and Southern Nuclear and its stakeholders celebrated the completion of Vogtle Units 3 and 4: the first new commercial nuclear power construction project completed in the U.S. in more than 30 years.

One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.

Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”

As he joined with other state officials and community stakeholders at a celebration last week marking the completion of Vogtle Units 3 and 4, Georgia Gov. Brian Kemp said there’s potential for a fifth nuclear reactor at the site.

Unit 4 at Georgia Power’s Plant Vogtle has entered commercial operation, the company announced today. The new unit can produce enough electricity to power an estimated 500,000 homes and businesses, according to the company.

Vogtle Unit 4 synchronized and successfully connected to the electric grid on March 1, just two weeks after reaching initial criticality.

This milestone is one of the final steps to completing Southern Nuclear’s long-awaited Vogtle project, adding the second of two large-scale reactors to the United States’ fleet in as many years—the first such additions to that fleet in more than three decades.

Georgia Power’s Vogtle-4, located near Waynesboro, Ga., reached initial criticality this week, hitting a major milestone in the start-up of the reactor.

The company announced the news on February 14. Initial criticality demonstrates that operators have safely started the nuclear reactor, or, in other words, the fission reaction within the unit is now self-sustaining and the nuclear reactor is ready to produce heat.

The long-awaited fourth unit at Plant Vogtle has hit another delay.

Atlanta-based Southern Co. announced last week that vibrations in the cooling system in Unit 4 require additional work that will push the reactor’s start date from the first quarter this year to the second quarter. The company said the problem is already fixed, but there is too much additional testing needed to meet a first quarter deadline.

Georgia Power, primary owner of the Vogtle nuclear plant, announced last Friday that it will pay $413 million to settle a lawsuit brought against it last year by plant co-owner Oglethorpe Power Corporation.

Georgia Power has signed a proposed agreement with the Georgia Public Service Commission’s (PSC’s) Public Interest Advocacy (PIA) staff and several intervening parties on the total amount the utility should be allowed to recover from ratepayers for the remaining costs associated with the Vogtle-3 and -4 nuclear expansion project. If adopted by the commissioners, the agreement will resolve all issues of the project’s prudency review, according to an August 30 PSC news release.

Georgia Power has begun the process of loading fuel into the Vogtle plant’s Unit 4 reactor, the company announced yesterday, marking another pivotal milestone toward commercial operation of the second of the facility’s two new units.

To the ears of the nuclear community, the news from Georgia Power this morning may sound a bit like “Ode to Joy” from Beethoven’s Ninth: After years of delay, Unit 3 at the Vogtle nuclear power plant has entered commercial operation, becoming the first newly constructed power reactor in the United States in more than 30 years and the nation’s first Westinghouse-supplied Generation III+ AP1000 unit to be placed into service. The new unit joins Vogtle-1 and -2—1,169-MWe four-loop pressurized water reactors that entered commercial operation in the late 1980s.

The Nuclear Regulatory Commission has authorized Southern Nuclear Operating Company to begin loading fuel into Unit 4 at the Vogtle nuclear expansion site near Waynesboro, Ga., making the unit the second reactor to reach this milestone in the agency’s combined license process—a little less than one year after Vogtle-3. (Prior to 1989, reactors were licensed under a two-step process, requiring both a construction permit and an operating license.)

Southern Nuclear, operator of Georgia’s Vogtle plant, has informed the Nuclear Regulatory Commission that all 364 inspections, tests, and analyses for Unit 4 have been performed, and all acceptance criteria for the new reactor have been met. Primary plant owner Georgia Power made the announcement last Friday.

The commercial operation of Georgia Power Company’s Vogtle-3 nuclear power plant has been delayed again, this time because of turbine troubles, the Associated Press reported last week.

The Vogtle expansion project’s Unit 3 reactor has attained 100 percent energy output—the first time it has reached its maximum expected output of approximately 1,100 MWe, Georgia Power announced yesterday.

Georgia Power has announced another key milestone for the Vogtle nuclear expansion project near Waynesboro, Ga.—the completion of hot functional testing at Unit 4. This achievement marks another significant step toward commercial operation for the Generation III+ AP1000 reactor, which is projected to enter service late in the fourth quarter 2023 or in the first quarter 2024.

Unit 3 at the Vogtle nuclear power plant has been successfully synchronized and connected to the electric grid, Georgia Power announced on April 1. The unit—one of two Westinghouse-supplied AP1000s at the Waynesboro, Ga., plant’s nuclear expansion site—becomes the first new U.S. power reactor to start up in seven years.

DOWNERS GROVE, ILL – The American Nuclear Society (ANS) CEO and Executive Director Craig Piercy issued the following statement on the connection of Vogtle unit 3 to the grid:

Already for the second time this year, Southern Company has announced a delay to the expected commercial operation of Unit 3 at the Vogtle nuclear plant’s two-unit construction site. In addition, a delay to Unit 4’s startup is also possible, Southern said.

Southern Company subsidiary Georgia Power on January 11 announced yet another delay to the startup of the Unit 3 reactor at the Vogtle nuclear power plant. It’s the latest in a long series of delays to the two-unit construction project at the Waynesboro, Ga., site. (Vogtle-3 was initially supposed to enter service in 2016.)