> For example, in Denmark[1] a solar-dominated grid would cost around 565 EUR/MWh. A nuclear-dominated grid would cost around 141 EUR/MWh.

That's not what it says. It says that would be the cost assuming the current grid and power came from only solar or only nuclear. The majority of the cost then is for overprovisioning and storage, especially to handle the lack of sun in the winter.

The actual low cost power comes from mixes of renewables, that they note nuclear can't compete with (especially in their hypothetical future energy system with things like scheduled EV charging). They give an example of offshore wind (66%), solar (8%), CCGT (26%) (primarily natural gas) for 66 EUR/MWh, or, restricting to biomass for the gas plant: offshore wind (84%), solar (13%), CCGT (3%) at 99 EUR/MWh.

(it's also worth noting that this is for Denmark. Something like 98% of Canadians live south of Denmark's southernmost line of latitude).

I chose those numbers to emphasize the system cost. Too many people go "Solar panels are cheap! Why don't we have them everywhere?" That's why.

There is not enough wind capacity in most countries