Canada

Solar is fast to install and "cheap" but the lifespan of panels is no more than 20 years, and batteries last 1s of years if cycled every day. Not to mention Ontario only gets ~1200kWh/m^2^ per year of sunlight, in the southern US it's >2000.

Nuclear is very expensive and takes a long time to build you are getting a plant that will last for decades without needing to have every part replaced and gives you more than 20kWh/m^2^ including the area taken up by support buildings and employee parking. (The Pickering plant is about 1km^2^ and puts out 23.6TWh)

I'm not sure it's quite so simple. A modem nuclear plant can run at 80-90% capacity and have an output of 1200MW. How many acres of solar panels are needed to achieve that power output, and how big would the energy storage systems be? Of course you can build solar distributed, but I think I recall equivalent area of solar panels for one modern nuclear plant is on the order of 10000s of acres. Building that with appropriate batteries and hooking it up could easily take a decade or more.

Anyway we should never aim to put all of our energy generation eggs in one basket. The technologies are complementary and diversity is a key principle of integrity and reliability of the supply.