Plug Power (NASDAQ: PLUG) has taken a notable step back from the precipice of financial ruin. Last fall, it issued a dire warning that it could run out of money within a year. That's no longer true after the company made several moves to shore up its liquidity.

However, Wall Street analysts still have concerns about Plug Power's future. Here's a look at three reasons they remain worried about the hydrogen stock.

Plug Power is spending heavily to build its hydrogen ecosystem. As a result, it's posting heavy losses and burning through cash. Last year, Plug reported over $1 billion in losses, more than its revenue. It expects to continue losing money for the foreseeable future.

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Source Fool.com