USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

Zero-Emission Bus Evaluation Results: King County Metro Battery Electric Buses (Report 00118)

This report outlines the evaluation plan and analysis protocol and presents the results from a one-year evaluation of three battery electric buses at King County Metro in Seattle, Washington. The evaluation compared three electric buses to a hybrid fleet, diesel fleet, and trolley fleet. The electric bus fleet accumulated more than 100,000 miles in the first 15 months of revenue service. Findings from the evaluation showed battery buses had an overall average efficiency of 2.36 kWh per mile, or 15.9 miles per diesel gallon equivalent (mpdge). The hybrid buses had an average fuel economy of 6.3 mpdge and the diesel buses had a fuel economy of 5.3 mpdge.

Last updated: Monday, October 8, 2018
DOT is committed to ensuring that information is available in appropriate alternative formats to meet the requirements of persons who have a disability. If you require an alternative version of files provided on this page, please contact