Denver International Airport (DIA) has opened 10 new Level 2 electric vehicle (EV) charging stations in its west parking garage, the airport announced.

The EV chargers are free to customers who pay to park in the garage, and are compatible with most battery electric and plug-in hybrid electric vehicles.

The new stations are the airport’s first public Level 2 chargers, which use 240-volt infrastructure and provide up to 20 miles of range per hour of charge time, according to U.S. Department of Energy estimates.

The project was partially funded using a grant awarded to DIA from the Charge Ahead Colorado Electric Vehicle and Charging Station grant fund, a program of the Regional Air Quality Council and the Colorado Energy Office. The grant will pay for $32,600 of the estimated $85,000 project, according to DIA.

The project brings to 20 the number of publicly available vehicle charging stations in the airport’s parking garages. DIA installed its first 10 electric vehicle charging stations in both the east and west parking garages in late 2013. Those Level 1 stations use 120-volt infrastructure that provides up to five miles of range per hour of charging time.