Plug Power, a maker of hydrogen fuel cells, plans to sell 375 million in debt. Agnes Lopez / Bloomberg via Getty Images Close Key Takeaways Top Stories Stocks Rise After 4 Days of Losses for S&P 500 Why Nvidia's Earnings Report is So Important Why the Fed's Next Move Is Becoming So Hard to Predict These College Degrees Face the Toughest Job Markets Plug Power (PLUG) shares sank Wednesday after the maker of hydrogen fuel cells announced it would sell 375 million in debt that could be converted into stock. ...