They're good for off-grid homes or an emergency BEV charger/power supply, they are good in areas on diesel generation if there is a good wind/solar resource (since diesel fuel is so expensive and may have to be flown in), in areas with lots of reservoir hydro and a good resource since the hydro can buffer some solar & wind, and of course solar is good on satellites and space probes <= Mars orbit or on the poles of the Moon.
You think wind and solar are impractical except for odd niche applications? What niche applications are you referring to?
They're good for off-grid homes or an emergency BEV charger/power supply, they are good in areas on diesel generation if there is a good wind/solar resource (since diesel fuel is so expensive and may have to be flown in), in areas with lots of reservoir hydro and a good resource since the hydro can buffer some solar & wind, and of course solar is good on satellites and space probes <= Mars orbit or on the poles of the Moon.