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"Warren Buffett is somebody who might be interested in hearing from constituents in Nevada. This is a terrible, terrible decision. The ruling went exactly the wrong way," Sanders said, according to a pool report of the event.

"So you might want to be thinking about writing a letter with a few hundred thousand signatures on it saying 'you know what? what you're doing here in Nevada is exactly wrong."

Activists say that the ruling has effectively eliminated the return on investment for those using solar in their homes.