A new nuclear reactor began commercial operations in the U.S. last week for the first time since 2016, with another likely to follow in the next several months, but they could be the last for a while thanks to years of construction delays and huge cost overruns related to the Vogtle project.

The 1,114-MW Unit 3 at Georgia’s Vogtle nuclear power plant is the first new nuclear reactor to start up in the U.S. since the Tennessee Valley Authority’s Watts Bar 2 (see graphic below). Vogtle’s similarly sized Unit 4 is expected to begin operations between November 2023 and March 2024. Construction at the two new reactor sites began in 2009. Originally expected to cost $14 billion and begin commercial operations in 2016 (Vogtle 3) and 2017 (Vogtle 4), the total cost of the project is estimated at more than $30 billion.

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