Does $0.77m per MW describe plant capacity or realized output? Is that a national average or is that for a particular geography?
Looking at some more modern projects and it is actually looking pretty good. I don't know how to account for unused capacity as it seems most PV util setups use about 30% of their capacity (do you just multiply the cost by 1.7?)
So a 100MW plant in the US quoted at $110 million including the cost of finance, profit margin, regulatory compliance, insurance and transmission with a capacity factor of 27% has 130MW DC of modules. Some other countries will quote DC so there may be a discrepancy. You can find harmonized comparions in things like the IRENA generation costs report, the ITRPV or the frauenhofer photovoltaics report. The US is also almost all single axis tracking where other countries may have fixed tilt as dominant.
New fixed tilt utility solar in 2023 is about 50-60c/Wdc or 80c/Wac. Single axis is about 70c/Wdc or $1/Wac.
The chinese nuclear project doesn't include inflation since 2008 (40%), cost of finance/escalation, chinese-government-accounting, or insurance. The (admitted) costs per watt of the chinese nuclear program have also increased substantially since 2008. Even with these, the claimed capex per MWh is comparable to solar in the west, but the O&M would make it much more expensive. Solar in china is 20-50% cheaper than the west.
Similarly costs for older nuclear plants in the US tend to exclude the cost of finance/escalation, as well as costs that were paid after they were "finished" due to upgrades needed for reliability (early capacity factors were <50%) and safety due to lessons learnt in incidents like browns ferry.
In the west O&M is about $30/MWh, which overlaps with the all-in cost of solar.
Also note that the cost of the Turkey facility you mentioned includes a factory which will produce many times more modules.
https://www.solarreviews.com/blog/how-does-utility-scale-sol...
See figure 9 in particular:
https://www.solarreviews.com/content/images/blog/SMI-2021-Q2...
Utility scale fixed tilt PV installations like Topaz were down to $0.77 per watt ($0.77 million per megawatt) by 2021.