The complex, owned by Georgia Power, had existed as a two-unit complex since its construction in the 80s, with each unit capable of generating 1215 megawatts for a total capacity of 2430MW.
The plant is powered by pressurised water reactors manufactured by Westinghouse, while the turbines and electric generators are manufactured by General Electric.
Plant Vogtle units 3 and 4 will be the first in the industry to use the Westinghouse AP1000 advanced pressurised water reactor technology. This advanced technology allows nuclear cores to be cooled even in the absence of operator interventions or mechanical assistance.
Vogtle is one of two nuclear facilities in the state and is expected to have its two new units online between 2017 and 2018.
A time lapse video spanning the last five years of construction work on the new units can be seen below.