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In 2014, Utah Clean Cities worked with park officials to expand Zion National Park's use of alternative fuels by replacing three gasoline-powered vehicles with all-electric and plug-in hybrid electric vehicles, and installing 10 electric vehicle charging stations, five of which are available for public use. Building on the success of this effort, Zion National Park is transitioning to electric buses for their shuttle service.

In 2012, the expansive Golden Gate National Recreation Area switched from higher-emission vehicles to five new electric vehicles (EVs). Golden Gate, which partnered with San Francisco Clean Cities, also installed five EV chargers and implemented a biodiesel project for heavy-duty vehicles.

Working with the State of Maryland Clean Cities coalition, in 2014 Catoctin Mountain Park replaced two conventional vehicles with plug-in hybrid electric vehicles and installed three electric vehicle charging stations for park and public use. The park also replaced four gasoline lawnmowers with propane mowers and shares their use with a nearby military base. Additionally, the project included an idle-reduction education and outreach initiative.

In 2014, Scotts Bluff National Monument incorporated an all-electric, multi-passenger low-speed vehicle to enable cleaner transportation options to the overlook at the top of the national monument. The project also included an idle-reduction education and outreach initiative.

From its open grasslands to rocky cliffs descending to the Pacific Ocean, Point Reyes National Seashore is home to 38 endangered and threatened species as well as a variety of unique ecosystems. With support from the San Francisco Clean Cities Coalition in 2015, the park added two all-electric vehicles to its fleet and installed two private charging stations to support their expanded fleet of electric vehicles. This project is estimated to help the park reduce its annual emissions by nearly 4 million tons of CO₂ and displace nearly 700 gasoline-gallon equivalents of petroleum per year.

Set partly within the Painted Desert of northeastern Arizona, Petrified Forest National Park offers glimpses of the world's largest concentration of petrified wood, fossils, and a fragile grassland ecosystem. Working with Tucson Clean Cities Coalition (TCC) in 2015, the park replaced all gasoline-fueled vehicles within its Visitor Services fleet and installed two publicly available electric vehicle charging stations in the park. It also worked with TCC to launch an extensive education and outreach effort designed to educate park visitors, tour bus drivers, and park staff about how to eliminate unnecessary engine idling, reduce fuel consumption, and improve local air quality. The old vehicles were replaced with one plug‐in electric vehicle and one hybrid electric vehicle. The electric vehicle supply equipment included a DC Fast Charger with Level 2 capabilities located at the park's north visitor center.

Independence National Historical Park, the home of Independence Hall and the Liberty Bell in Philadelphia, tells the story of ideas that have shaped our nation. In 2015, the park replaced six of its conventional mowers with propane mowers, as well as three of its conventional refuse-collection vehicles with those that run on electricity. Over the course of the next 10 years, the park expects to save nearly $20,000, all while demonstrating how these technologies are helping to protect one of America's most important historic sites.

In 2014, the Southern Colorado Clean Cities coalition and Florissant Fossil Beds National Monument collaborated to replace two gasoline vehicles with two all-electric low-speed vehicles, install an electric vehicle charging station, and add an all-electric utility vehicle to their fleet. The project also included an idle-reduction education and outreach initiative.

Rocky Mountain National Park, with more than 3 million annual visitors, is the fifth most-visited park in the NPS system. With support from Northern Colorado Clean Cities in 2013, the park purchased one propane pickup truck and two Chevy Volts, installed two electric vehicle charging stations, and boosted idle-reduction through technology deployment and a comprehensive education and outreach program.

In 2013, Sleeping Bear Dunes National Lakeshore added one propane pickup truck and three plug-in electric vehicles to its fleet and installed four electric vehicle charging stations and an air pump that will allow drivers to keep their tires properly inflated. These measures will reduce the environmental impact of the park's fleet by about 15%, as compared to a 2010 baseline. The new vehicles and infrastructure will help educate the park's 1.3 million visitors about alternative fuels and fuel-efficient driving. Working with Michigan's Clean Energy Coalition, the park developed an extensive training and outreach program to educate staff, concessioners, and visitors on the benefits of idle reduction.