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Last week the Napa Unified School District in California received its first plug-in hybrid school bus. The bus was built by IC Corporation which is a subsidiary of Navistar and a major producer of school buses. The bus uses a parallel hybrid diesel electric powertrain produced by Enova. The electric motor is integrated into the transmission and is designed as a drop-in system that can be easily installed either by the bus manufacturer on the original assembly or retrofitted to existing buses.