> The one thing that low carbon grids around the world share is high portion of nuclear (or hydro, which you can't build unless it naturally exists).
This is an historical artifact. When that generating capacity was built, nuclear was the alternative to fossil fuels. It isn't today; renewables are now cheaper and faster to install.
Your argument can be seen as a way to ignore the cost decline of renewables without at first glance doing so.
(As you say, there are hydro-dominated grids with no nuclear, for example Costa Rica, which gets 98% of its electrical energy from renewables.)
This is an historical artifact. When that generating capacity was built, nuclear was the alternative to fossil fuels. It isn't today; renewables are now cheaper and faster to install.
Your argument can be seen as a way to ignore the cost decline of renewables without at first glance doing so.
(As you say, there are hydro-dominated grids with no nuclear, for example Costa Rica, which gets 98% of its electrical energy from renewables.)