New York/Los Angeles — When deadly wildfires tinted Western skies a Martian hue this week, homeowners with their own rooftop solar systems were able to tell with great precision just how much useful sunlight reached them through the gloom: next to none.

Wednesday was “the worst generation day, ever”, said Mary Holstege, a retired software engineer in Cupertino, California, who went solar a year ago. Her system, which puts out 40kWh a day in the summer, barely dribbled out 1.65  — maybe enough to dry a load of laundry...

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