France has been offering lower prices at night to make the most of their nuclear since the 1960s.

Australia used similar tech to make the most of baseload coal overnight since the 1950s.

It's just a good idea, and should be used to get cheaper cleaner power in grids today too.

It is not even an "idea". Is the consequence of nuclear power being so difficult to modulate to consumption. You give it for free by night, hoping that at least some people consumes, because the country is sleeping.

Solar energy aligns so much better, peaking its production when the consumption is high, going to zero when the consumption gets low, except for the diner time. In Spain we get really low prices (sometimes near 0) in the middle of the day, you don't have to plan or incentivize night consumption.