HydroGen Corporation (HydroGen), through its wholly owned subsidiary, HydroGen, LLC, designs, manufactures, markets and distributes fuel cell modules and energy systems (power plants) using phosphoric acid fuel cells (PAFC). HydroGen’s core technology is a 400 kilowatt (kW) air-cooled, PAFC module, which comprises four 100 kilowatt stacks within one pressure vessel. The fuel cell stack technology and configuration were tested by Westinghouse in over 125,000 hours of stack testing of different capacities, and over 2,000,000 hours of smaller scale cell testing. Additionally, HydroGen has conducted over 400,000 hours of small scale testing and over 6,000 hours of stack testing. In October 2008, HydroGen LLC entered Chapter 11 protection.