[BenoitP]

> All the nuclear supply has already been sold and is being constantly used 100% of the time.

This couldn't be further from the truth, at least for France: hover over the lower graphs to animate the source upper graph here: https://app.electricitymap.org/zone/FR

Every single day nuclear oscillates between 60% and 80%, in strong anti-correlation with wind, solar and border exchanges.

With hydro and pumped storage, this margin is well enough for attending to peak demand. And it is economically viable; This is the thing about nuclear: it costs practically the same wether you're at 20% or 95% of the plant's capacity. You consume your fuel faster, but it is only a small fraction of the cost (15% IIRC). And you still get 0 CO2 emission.

And with current gas prices this is the cheapest solution we have at the moment. (not the cheapest in terms of political will, but educating masses can solve that)

[adrianN]

If you're at 20% capacity it costs about 5x as much as when you're at 100% capacity. With nuclear almost all the cost is in building (and decommissioning) the plant.