King County Metro generated nearly $1.5 million by selling credits through Washington's Clean Fuel Standard program. The agency produced more than 27,000 credits between 2023 and March 2026, using electricity from its 100-plus battery-electric buses and 174 electric trolley buses. Revenue from credit sales will support further greenhouse gas reductions under the county's climate action plan. Washington's Clean Fuel Standard requires gasoline and diesel suppliers to lower the carbon intensity of their fuels over time. They buy credits from entities that provide or use cleaner transportation fuels, including electricity. Metro says its bus fleet emissions have fallen 45% since 2024, and it expects about $1 million in annual credit revenue, though prices can vary. Transportation makes up nearly half of King County's greenhouse gas emissions, and the county is targeting a 70% cut in fleet emissions by 2030 compared with 2017 levels.
