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There's One Stock That Always Rallies When a Big Storm Hits

  • Generac shares up about 19 percent since storms neared U.S.
  • Some residents could be blacked out for weeks after Irma
Hurricane Irma in Miami Beach, Florida, on Sept. 10, 2017.

Hurricane Irma in Miami Beach, Florida, on Sept. 10, 2017.

Photographer: Joe Raedle/Getty Images
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The wrath of hurricanes Harvey and Irma has led investors to bid up shares of the only publicly-traded U.S. company whose business mainly comes from selling backup power.

Generac Holdings Inc. has seen its stock price rise 19 percent since late August, just before the storms slammed into the southeastern U.S., knocking out power to millions. Demand for Generac’s portable generators could add about 20 percent to the Waukesha, Wisconsin-based company’s sales growth this year, according to Charles Brady, an analyst for SunTrust Robinson Humphrey.