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Through its partnership with Zion National Park, Utah Clean Cities worked with park officials to expand Zion’s electric vehicle initiative to neighboring Cedar Breaks National Monument. In 2016, Cedar Breaks installed one electric vehicle charging station and deployed one plug-in hybrid electric vehicle. The project is helping to expand the availability of electric vehicle charging stations throughout National Park Service units in the Southern Utah region. The project also included an idle-reduction education and outreach initiative.

In 2013 through its partnership with Zion National Park, Utah Clean Cities worked with park officials to expand Zion’s electric vehicle initiative to neighboring Pipe Spring National Monument. Pipe Spring installed one electric vehicle charging station and acquired one plug-in hybrid electric vehicle. The project is helping to expand the availability of electric vehicle charging stations throughout National Park Service units in the Southern Utah region. The project also included an idle-reduction education and outreach initiative.

In 2014, Yellowstone National Park acquired a plug-in electric vehicle and installed publicly accessible electric vehicle charging stations. The project supports a broader effort to expand clean transportation options within the Greater Yellowstone Ecosystem. The park has already added an electric utility vehicle, hybrid electric vehicles, and a hybrid electric bus to its fleet in 2011. With help from the Yellowstone-Teton Clean Energy Coalition, the park also enhanced public outreach for idle reduction efforts.

In 2011, Grand Teton National Park added five hybrid electric vehicles to its fleet. Subsequently in 2014, the park added one plug-in hybrid electric vehicle and installed three electric vehicle charging stations. The installation of the charging stations supports an initiative to grow a larger regional electric vehicle infrastructure network. This initiative introduced charging stations and electric vehicle use to the heart of the Greater Yellowstone Ecosystem and set the stage for government agencies, local business, residents, and visitors to begin using charging stations throughout the area. Working with Yellowstone-Teton Clean Cities, the park has launched an extensive education and outreach effort designed to eliminate unnecessary engine idling, reduce fuel consumption, and improve local air quality.

Mammoth Cave National Park started using E85 in 1999 and today runs all its vehicles on alternative fuels. Thanks to funding in 2011, the park added four propane-powered school buses, two propane-powered pickup trucks, and one electric utility vehicle to its fleet. In addition, park personnel partnered with the Kentucky Clean Cities Partnership to enhance efforts to educate visitors, employees, and the media about the benefits of using alternative fuels.

Blue Ridge Parkway worked with the Land of Sky Clean Vehicles coalition to shift to domestic fuel use in the park. In 2012, Blue Ridge acquired four hybrids and four propane pickup trucks to replace less-efficient vehicles dating back to model year 1989. The vehicles are helping raise awareness of sustainability among the park's visitors. The park also installed a propane refueling station.

The National Mall and Memorial Parks has been a must-see stop in the nation’s capital for hundreds of millions of visitors throughout the mall’s 200-year history. In 2013, the Greater Washington Region Clean Cities coalition teamed with the National Mall in an effort to modernize its high-profile fleet and acquire two plug-in electric vehicles, four electric vehicle charging stations (two for public use), and idle-reduction technologies. The mall also partnered with the Propane Education and Research Council to deploy seven propane-powered mowers.

San Antonio Missions National Historical Park, which partnered with Alamo Area Clean Cities, is taking steps to reduce pollution in San Antonio. In 2012, the park purchased two propane pickup trucks to replace two outdated gasoline-powered pickup trucks. The park also installed two electric vehicle chargers and a propane vehicle refueling site.

Great Smoky Mountains National Park worked with East Tennessee Clean Fuels and the Land of Sky Clean Vehicles Coalition to shift to domestic fuels and advanced vehicle technologies. In 2013, the park replaced three gasoline pickup trucks with all-electric vehicles, converted five gasoline mowers to operate on propane, and installed four publicly accessible electric vehicle charging stations. In 2015, the park added four propane pickup trucks and installed two propane refueling stations. These activities are estimated to help the park reduce its annual emissions by almost 40 million tons of CO₂ and displace the use of nearly 8,900 gasoline-gallon equivalents of petroleum per year.

In 2015, Cape Cod National Seashore, with support from Massachusetts Clean Cities, replaced three conventional vehicles with plug-in electric vehicles and installed electric vehicle charging stations for the park's fleet use. This project helped the park further their fleet's shift to domestic fuels and advanced vehicle technologies.