Electric charging stations have arrived at Ronald Reagan Washington National Airport. There are four stations up and running, each of which can handle two vehicles at a time.

They are on the lowest level of Daily Garage B and are reserved for electric vehicles. There’s no fee to use the stations, but you still have to pay the normal rate to get out of the garage.

The, Metropolitan Washington Airports Authority, which operates National and Dulles International Airport, opened four charging stations at Dulles last month. Eight stations arrived at Baltimore-Washington International Marshall Airport last year.

The new stations at National Airport, like the stations at Dulles, have two types of chargers: Level 1, a 120-volt outlet, and Level 2, a 240-volt connector.

You can see if a station is available or activate a station with the ChargePoint app (available for iPhone, Android and Blackberry).