Renewable and low-emission energy sources will likely play an essential role in controlling humankind's climate impact over the coming decades. Solar and wind have gotten much attention, but hydrogen could unlock renewables to displace even more fossil fuel use.

Plug Power (NASDAQ: PLUG) is a leader in commercialized hydrogen fueling and strives to build a hydrogen energy business across North America and Europe. Success could mean life-changing investment returns from a stock worth just $2 billion today.

How likely is Plug Power to make investors millionaires over the coming years? Anything is possible, but there are three significant roadblocks facing optimistic investors. Here is what you need to know.

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Source Fool.com