Plug Power stock once rose 3,600% in value. Can shares double again over the next 5 years? Plug Power (PLUG 1.11%) stock has a history of soaring in value. Once, in a single year, shares increased 36 times in value. A $500 investment would have grown into$18,000 in just 12 months. Plug Power's management team is arguing that the company's best days are ahead of it. Could shares double again over the next five years? Expect Plug Power stock to be volatile Plug Power has an extremely volatile history, full o ...