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The U.S. Department of Energy's (DOE) Vehicle Technologies Office has funded hundreds of projects across the country that advance affordable, domestic transportation fuels and technologies.


Project Initiative/Award Awardee Status Date
Mammoth Cave National Park National Parks Initiative Kentucky Clean Cities Partnership Complete Sep 2015

States impacted:

  • Kentucky

Mammoth Cave National Park

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.

Learn more about the National Parks Initiative.


  • Kentucky Clean Cities Partnership