Sizewell C will be a new two-reactor nuclear power station on the Suffolk coast that could generate 3.2 gigawatts of electricity.
It is claimed that, once built, it could power the equivalent of about six million homes and will generate electricity for 60 years.
The power station will sit just north of the existing Sizewell B plant, which has been operating since 1995, just off Sizewell beach, close to the town of Leiston.
The decommissioned Sizewell A site, which first opened at the same site in 1967, stopped generating electricity in 2006.
The Sizewell C plant is expected to be operational by the mid to late 2030s.