The fuel-cell systems company lost 4 cents per share in Q2, better than its 10-cent loss a year ago, in line with estimates. Its revenue jumped 131% to $17.32 mil, blowing past estimates for $16.65 mil and driving its stock up 4.2%. Plug Power (PLUG) makes GenDrive fuel-cell systems. Customers bought a total 687 GenDrives in Q2, including Wal-Mart Stores (WMT) and Procter & Gamble (PG). FuelCell Energy (FCEL) surged 7.2% after Cowen upgraded its stock to outperform from market perform and raised its price target.