In early 2007, the National Renewable Energy Laboratory (NREL) published a preliminary evaluation results report (January 2006 through November 2006) on hydrogen- and CNG-fueled buses operating at SunLine Transit Agency (SunLine) in Thousand Palms, California (Palm Springs Coachella Valley area). This report provides an update to the previous report and includes results and experience from December 2006 through June 2007. The evaluation covers one prototype fuel cell bus, one prototype hydrogen hybrid internal combustion engine (HHICE) bus, and five new CNG baseline buses operating from the same SunLine bus depot. The evaluation periods presented in this report are as follows: Fuel Cell Bus--January 2006 through June 2007 (18 months of operation); HHICE Bus--January 2006 through June 2007 (18 months of operation); New CNG Buses--July 2006 through June 2007 (12 months of operation). The fuel cell bus was manufactured by Van Hool and ISE Corp. and features an electric hybrid drive system with a UTC Power PureMotion 120 Fuel Cell Power System and ZEBRA batteries for energy storage. The HHICE bus from New Flyer has essentially the same electric hybrid drive system from ISE Corp. but with ultracapacitors for energy storage and a Ford V10 Triton engine customized to operate on hydrogen fuel. The new CNG buses from Orion Bus Industries use Cummins Westport C Gas Plus natural gas engines.
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