SunPower (NASDAQ:SPWR) stock is surging higher by about 50% today. Last week, SPWR stock plunged lower by around 75%, marking the solar company’s worst ever week. That came as the company announced that it would no longer provide solar panel leases to customers. In April, SunPower said that it would stop selling panels directly to customers.As of June 30, there were 29.15 million shares of SPWR stock sold short, totaling $86.28 million. That’s equivalent to a short interest as a percentage of float of 54.60 ...