In Hawaii , plug-in vehicles that are eligible and affixed with a special licence plate issued by the state can travel in the HOV lanes without meeting the minimum passenger requirements . And for every 100,000 residents , the city of Honolulu boasts 5.1 electric vehicle charging stations . The state of Hawaii has launched a free mobile application and web-based database to enable drivers to locate publicly available EV charging stations across the state .

Arizona offers a tax credit of up to $ 75 to individuals who install an EV charging outlet in their home . In addition , the state provides reduced licensing fees for electric vehicles as well as some hybrids that are plugins . Tucson ’ s 5.3 charging stations for every 100,000 residents means that drivers won ’ t have to rely only on their home network in order to charge their electric vehicle .

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