Yellowstone-Teton Clean Cities | 310 followers on LinkedIn. With increasing need for displacement of petroleum in transportation, the Yellowstone-Teton Clean Energy Coalition is where fleet managers, business leaders, local governments, and community members turn to for on-the-ground advocates of alternative fuels and efficient transportation. The Coalition, designated in 2002 as the sole regional designee of the Department of Energy’s Clean Cities program, serves communities throughout Wyoming, Montana and Idaho. The Coalition collaborates with Yellowstone and Grand Teton National Parks to provide alternative vehicles and improve air quality in our most treasured places.