After languishing for decades, can this clean energy stock finally make a comeback?

Long-term investing is usually the key to sustainable returns in the stock market, but it doesn't always win. With shares down by an eye-watering 98% since hitting the market with an initial public offering (IPO) in 1999, Plug Power ( PLUG -2.44% ) is an excellent example of this strategy gone wrong. But could the perennial loser be poised for a comeback?

Two-and-a-half decades after the company's initial public offering, some analysts think its hydrogen fuel cell technology may soon be ready for primetime. And warehouse giants like Amazon and Walmart are beginning to take notice. Will Plug Power finally start rewarding its long-suffering investors?

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