Bouncing back from closing 10.5% lower yesterday compared to Monday's close, FuelCell Energy (NASDAQ: FCEL) stock is soaring today. The company announced a supply agreement with a developer of data center infrastructure this morning, motivating investors to power their portfolios with shares of the fuel cell specialist. As of 10:40 a.m ET, shares of FuelCell Energy are up 6.4%, retreating from an earlier rise of 15.5%. Missed Nvidia in 2009? This Rare Signal Is Flashing Again.