One of the advantages is that you can use power sources other than the sun in regions where it's not plentiful. Eg. geothermal in Iceland during winter. Or nucl

One of the advantages is that you can use power sources other than the sun in regions where it's not plentiful. Eg. geothermal in Iceland during winter. Or nuclear (either fission or fusion). But sunlight is so cheap in general that those are really niche situations.