King County Metro Battery Electric Bus Demonstration: Preliminary Project Results

Leslie Eudy, Matthew Jeffers

Research output: NRELBrochure


The U.S. Federal Transit Administration (FTA) funds a variety of research projects that support the commercialization of zero-emission bus technology. To evaluate projects funded through these programs, FTA has enlisted the help of the National Renewable Energy Laboratory (NREL) to conduct third-party evaluations of the technologies deployed under the FTA programs. NREL works with the selected agencies to evaluate the performance of the zero-emission buses compared to baseline conventional buses in similar service. The evaluation effort will advance the knowledge base of zero-emission technologies in transit bus applications and provide 'lessons learned' to aid other fleets in incrementally introducing next generation zero-emission buses into their operations. This report provides preliminary performance evaluation results from a demonstration of three zero-emission battery electric buses at King County Metro in King County, Washington. NREL developed this preliminary results report to quickly disseminate evaluation results to stakeholders. Detailed evaluation results will be published in future reports.
Original languageAmerican English
Number of pages6
StatePublished - 2017

NREL Publication Number

  • NREL/BR-5400-68412

Other Report Number



  • battery electric bus
  • FTA
  • technology validation
  • zero-emission transit bus evaluation


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