Plug Power is making progress on its strategic plan.

Plug Power ( PLUG 5.52% ) recently reported its second-quarter financial results, showing clear advances alongside ongoing challenges. The hydrogen company is making progress, but must continue to make significant improvements to achieve sustainable profitability.

Here's a closer look at Plug Power 's second-quarter results and what they imply for long-term investors considering the hydrogen stock .

Parsing out the positives

Plug Power booked $174 million in second-quarter revenue, up 21% year over year. Strong demand for its GenDrive fuel cells, GenFuel hydrogen infrastructure, and GenEco electrolyzer platforms drove the surge. Electrolyzer revenue tripled year over year to $45 million as the company expanded its global p

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