If you listen to Plug Power's (NASDAQ: PLUG) management team, there's a ton of long-term upside to the company's business. Trillions of dollars are being invested into renewable technologies right now, including hydrogen fuel cells, which Plug Power specializes in. There's a case to be made that the company is primed to ride a tidal wave of investor interest.

Analysts at Goldman Sachs aren't so sure. In fact, according to a new research piece, there's one factor in particular that they are worried about.

Plug Power is all in on hydrogen fuel cell technology. The company was founded in 1997 for this purpose. hydrogen fuel cells are electrochemical units that combine hydrogen and oxygen atoms to produce energy. hydrogen fuel cells are already being used on a small scale in power plants, vehicles, spacecraft, computers, and cellphones. The issue isn't whether the technology works, but whether it works at scale at an economic price point.

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Source Fool.com