But won’t forever.

Wayne National Forest/Flickr

I often get flak when I publish research on the cost trajectory for solar (my “Rooftop Revolution” report estimates 100 million Americans reaching grid parity by 2021). About half think I’m too conservative, and half think I’m too overconfident that solar will continue to drop in price by 7 percent per year indefinitely.

But I’m not alone in perceiving an enormous cost reduction opportunity for solar in the United States. An article in Forbes last week suggested that we can “Cut The Price Of Solar In Half By Cutting Red Tape.”  It provides a chart (reproduced below) like one I published in March, that shows how a similarly sized residential solar array in Germany costs 60 percent less than one built in the U.S.

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