Unit 3 at the Vogtle nuclear power plant has achieved initial criticality, Georgia Power announced yesterday. A key milestone on the way to the reactor’s commercial operation, initial criticality demonstrates that operators have safely started, for the first time, the nuclear reaction inside the unit. (Fuel loading at Vogtle-3 began last October.)

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 Nuclear, operator of the two-unit Hatch nuclear plant, announced yesterday that it will seek subsequent license renewals (SLR) for both reactors.

Commercial operation dates for the two new reactors under construction at the Vogtle nuclear plant have been pushed back yet again, adding to the project’s total cost, Southern Company announced last week. The Vogtle plant is near Waynesboro, Ga.

During its February 17 fourth-quarter earnings call, Southern reported that the projected start dates for both reactors were being extended by three to six months. Vogtle-3 is now expected to begin providing electricity to Georgians in the fourth quarter of 2022 or first quarter of 2023, with Vogtle-4 coming on line in the third or fourth quarter of 2023.