Workplace charging is exploding in popularity, and it’s encouraging more and more drivers to go electric.

The DOE’s EV Everywhere Workplace Charging Challenge, a program that offers assistance to companies to provide charging to their employees, began in January 2013, and has since grown to 150 partners, which provide charging at over 300 work sites across the country.

Overall, the DOE says workplace charging has nearly doubled in the last two years – as of May, there were almost 4,000 workplace charging stations in operation. About 3,000 of those are Level 2 units, and the rest are 120-Volt Level 1 stations.

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According to an August DOE survey, employees of companies with charging stations are 20 times more likely to drive a plug-in vehicle. One in 73 Challenge partners’ employees drives a plug-in vehicle, compared to the national average of one in 1,400.

The survey also found that 90% of partners reported that their workplace charging stations are fully occupied at least 5 days a week.

Source: DOE via Green Car Reports