Just a quicky guess.
US economy = $10 trillion per year. That's $27 billion per day.
60 million without power at the height. A lot gained power quite quickly. Estimate 1/3 of that 60 million was without power for 3 days (total average). That's 20 million * 3 = 60 million.
That would mean 60million/280million = 20% of US without power for a day.
Assume they contributed 0 to the GDP for that period. So that's about .2*$27 billion = $5.4 billion. My quicky guess. It's probably more than that because not only were the people w/o power not able to buy goods and services in or outside of their area, neither were people outside of the area able to buy goods and services within. So I'd double it. I'll take $11 billion.
Just got back from a 3-day roadtrip. Not going to estimate the error on that. ;-)
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