BTW: I think you are exaggerating the impact of dust storms.

Worst case is reduction of solar insolation to 5% of clear sky conditions based on the Opportunity experience. But this was probably mostly dust on the panels themselves rather than actual reduction of solar insolation.

Vertical panels fixes this.

Also dust storms don't last 6 months, more like 3 and the insolation isn't worst case the whole time. Opportunity was just in a bad location.

With vertical solar panels widely distributed and well positioned the drop in solar production won't be 95% or even 90%. More like 50-70%.

The solution is just more solar panels and cutting energy intensive industrial production during dust storms.

Land for solar panels is unlimited on Mars and solar panels can be very light weight. Their power to weight ratio is much better than nuclear.