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There's not much sun in the northern areas in winter. Storage might cover 12 hours worth of usage, not 6 months of usage, including all the heating.

The northern areas are closer to the equator than half of europe, where sun power seems to do just fine all year round.

?

Are you confusing "uses solar power" with "could rely solely on solar power"?

And norther areas of what, exactly? I mean that there are areas where nuclear power would be useful (as it can displace coal/natgas).