Growing energy needs, a beaten-down valuation, and clean energy solutions have made Plug Power a hot stock to own this year.A couple of years ago, things looked dire for Plug Power (PLUG 3.69%) stock. It was plunging in value and it even issued a going concern warning, which means that the business was concerned about its finances and that there were significant doubts about its ability to continue operating.The company says that risk no longer exists. And not only are its financials stronger, but the energ ...