Why Shares of Plug Power Are Tanking on Tuesday

After bounding higher to start the week yesterday, shares of Plug Power (NASDAQ: PLUG) are headed in the other direction today. Instead, shareholders are likely responding to the stock's rise yesterday and to news related to another company dealing in hydrogen production, Cummins (NYSE: CMI). The other likely catalyst for the stock's decline is the news that Cummins has received a $5 million award from the Department of Energy Hydrogen and Fuel Cell Technologies Office.