Is Plug Power Stock a Buy?

When your flaky, deadbeat friend from high school suddenly hits the jackpot with a new job or a savvy investment, it's extra surprising. That's how I feel about Plug Power (NASDAQ: PLUG). The company just can't seem to get its act together, and yet its stock price has risen more than 350% in the past year! Is Plug finally turning itself around, or should investors continue to steer clear?

Let's take a closer look at this longtime underperformer to find out. 

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Source Fool.com