The total power is going to be 1.65 GW, and the total cost $1.5 BN. That would be about $0.9 BN per GW.
Meanwhile Vogtle 3 and 4 will make about 2.3 GW together for a total cost of $25 BN, so a bit more than $11 BN per GW, or about 12 times more.
But that's not quite apples to apples. Solar power has an average capacity factor of about 30%, while nuclear about 90%.
What is then the cost of 1000 GWh annual net output? I picked out 4 more or less random large solar farms in the US from wikipedia [1] (Solar Star, Mount Signal, Springbok and Copper Mountain) and on average a 1 GW (DC current) farm produces about 1800 GWh annual net output. Assuming this new farm is similar to those other 4 large solar farms (which are all fairly new, commissioned between 2015 and 2020), then the cost of 1000 GWh is about $0.5 BN.
Meanwhile, Vogtle 3&4 have about 19000 GWh annual net output, for a nominal power of 2.3 GW, so if we scale to 1 GW, we get about 8.2 GWh per year. We get a cost of about $1.3 BN for 1000 GWh annual net output.
So each GWh produced by a modern solar farm is about 2.6 times cheaper than a GWh produced by an equally modern nuclear power plant.
Can nuclear become cheaper? NuScale claims to be able to deliver nuclear power plants at a cost of about $2.85 BN per GW [2], which is 3.8 times cheaper than Vogtle 3&4. If they are able to deliver, then they should be quite cost competitive with modern solar.
[1] https://en.wikipedia.org/wiki/List_of_photovoltaic_power_sta...