Identical solar panels will produce different amounts of electricity when they're exposed to different levels of sunlight. So, solar panels in sunnier places (like the American southwest) with more direct sunlight (like in the south) will produce more electricity. But other factors make solar a good deal for homeowners. New England has one of the highest regional adoption rates for residential solar in the US. That's not because it has a ton of sunshine year round, but because it has favorable solar policies, like net metering and rebates. Solar panels might make financial sense even if they'll be installed under frequently cloudy skies.