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Sustainability is commonly defined as meeting the needs of the present without compromising the ability of future generations to meet their own needs. A founding signatory to the American Public Transportation Association (APTA) Sustainability Commitment, Metro is committed to adopting core processes that ensure ongoing environmental, social, and economic sustainability practices are continually improved over time.

Sustainability at Metro  Publications

Sustainability at Metro

 In 2013, Metro received gold-level recognition from APTA based on a review of sustainability indicators, and is one of only twelve transit agencies in the country to achieve gold-level status (as of March 2014).  At Metro, we address sustainability in terms of both the services we provide and how we operate.   

Transportation accounts for nearly half of all greenhouse gas (GHG) emissions in Washington. As the largest public transportation provider in the Puget Sound region, Metro plays a key role in reducing the number of single-occupant vehicles on the road and associated pollution. Metro displaces roughly four times more GHG emissions than it generates — a net displacement of approximately 600,000 metric tons of carbon dioxide equivalent (MTCO2e) each year — by:

  • Taking cars off the road
  • Reducing traffic congestion
  • Facilitating more efficient land use

Metro’s service guidelines identify areas of population and employment growth priority for increased transit service. Metro is also working with local jurisdictions to update obsolete parking standards to encourage more transit and pedestrian-friendly development, and participates actively in the Puget Sound Regional Council’s Growing Transit Communities initiative working to locate housing, jobs and services close to transit.

Learn more about Metro services that support sustainability:

King County policies and plans provide direction for reducing Metro’s environmental footprint, with a strong emphasis on energy resources, GHG emissions and sustainable buildings/development. Metro released its first Sustainability Plan in early 2014 with specific goals related to:

  • Energy efficiency and conservation
  • Climate pollution reduction
  • Water conservation
  • Waste management
  • Building ridership

Metro has aggressively pursued opportunities for resource conservation, completing various lighting and HVAC upgrades, utilizing an innovative “cyclone” recycling system for cleaning buses, and attaining LEED certification for all buildings constructed since 2007.  Metro initiated an Environmental Sustainability Management System (ESMS) at the South Base and Component Supply Center campus in 2011.  Metro staff actively participates on several county committees, including the Energy Task Force, Green Building Team and the Department of Transportation’s Equity and Social Justice team.

Sustainability Plan

Download: PDF or Flip Book

Learn more about how Metro and the County addresses sustainability in operations:

Metro's motorbus fleet consists of diesel-electric hybrid, electric trolley and diesel buses. As of June 2015, approximately 70% of Metro's bus fleet was comprised of zero emission electric trolleys or diesel-electric hybrids. Metro's motorbus fleet is projected to be 100% hybrid or electric by 2018. These hybrid buses are up to 30 percent more fuel efficient than the diesels being replaced.

Advancements in Technology & Innovation

  • Trolley Fleet Replacement: Metro operates the second largest zero-emission, electric trolley bus system in the country with routes throughout King County. Metro is currently replacing its existing fleet of aging trolley buses with new buses that have regenerative braking and the ability to operate off-wire on battery power for short distances – reducing the need to substitute diesel and hybrid buses when construction affects routes along electric bus corridors.
  • Battery Bus Pilot Project: Metro is testing an all-electric battery-powered bus with federal grant funds. Like the latest generation electric trolleys, battery-powered buses are more energy-efficient than internal combustion powered vehicles and hybrids.
  • Electric Vehicle Subcomponents: Metro is initiating the use of electric subcomponents on transit vehicles by replacing components that are traditionally driven off belts and gears from the engine, such as cooling fans. Electric engine fan cooling systems are expected to improve fuel efficiency on buses by up to five percent. Additional benefits associated with these upgrades include better reliability, lower emissions, easier maintenance, and improved bus performance.
  • Start-Stop Technology: Metro is deploying new diesel-electric hybrid coaches that, when stopped, turn the engine off and switch to battery power to reduce fuel use (similar to a hybrid passenger car).

Commuter Vans

Metro’s Commuter Van Program is the largest publicly owned and operated rideshare commuter van program in the country. In 2014 the number of commuter vans in revenue service increased 3.4 percent to 1,412 vehicles.

The commuter van fleet eliminated over 54 million vehicle miles traveled from Puget Sound roads and reduced approximately 21,000 metric tons of GHG emissions in 2014. This includes Metro’s all-electric, zero emissions metropool vehicles. A total of 25 new five-passenger Nissan LEAFs were added to the Commuter Van Program from 2011-2013 to establish the metropool fleet.


Feasibility of Achieving a Carbon-Neutral or Zero-Emission Fleet
March 2017

A report detailing how Metro Transit can transition to a completely zero-emission bus fleet as early as 2034.

Sustainability Plan Progress Report
September 2015

2014 summary of achievements and progress meeting goals identified in Metro's Sustainability Plan.

PDF   |   Flip Book
King County launches next generation of electric trolleys
August 18, 2015

For the first time in nearly three decades, King County Metro riders will enjoy completely new state-of-the-art electric trolleys in downtown Seattle and nearby neighborhoods starting August 19.

Sustainability Fact Sheet
Summer 2015

How Metro is protecting our region's environment.

Sustainability Plan Progress Report
October 2014

2013 summary of achievements and progress meeting goals identified in Metro's Sustainability Plan.

PDF   |   Flip Book
Metro will test battery-powered, zero-emission buses
August 2014

Ten years after first hybrid buses, Metro delivers an even more energy-efficient fleet.

2013 Annual Sustainability Report
June 2014
PDF   |   Flip Book   |   Website
Metro Transit Sustainability Plan
April 2014
PDF   |   Flip Book
Metro is APTA Gold
July 25, 2013

Metro was recognized by APTA in 2013 for achievements in reducing facility energy use, water use, waste generation, and criteria air pollutant emissions, and increasing recycling rates.

2012 Annual Sustainability Report
June 2013
PDF   |   Flip Book
King County 2012 Strategic Climate Action Plan
December 2012
PDF   |   Flip Book   |   Website
Metropool Leads the Way with Electric Vehicles

The metropool pilot program launched in 2011 and now has 25 all electric, zero emission Nissan LEAF's for use in Metro's vanpool fleet.

2010 King County Energy Plan
October 2010
PDF   |   Flip Book