Plug In America’s EV Charging Infrastructure Study

In 2012, in order to better understand the current state of electric vehicle charging infrastructure, Plug In America conducted a public charging infrastructure study. There were multiple components to the study, including the survey described below. Additionally, real-time information from the Blink and ChargePoint web sites were recorded and analyzed to determine patterns of network usage and availability.

The EV Charging Infrastructure Survey

As part of a study of the state of electric vehicle charging infrastructure presented at EVS26, the goal of the survey was to answer a simple question:

If an EV driver goes to a public charging site will there be charging available?

There are two aspects of this.

The first was to get a description of as many sites as possible. For each site, we collected information to answer these questions:

  • Can the site be easily found?
  • Are the charging stations accessible and available?
  • Are the stations in proper working order?

The second aspect is of a more statistical nature: each time this site was subsequently visited by a member of our survey team, was it possible to charge?

Charging Network Data Collection

In addition to the manual survey, data was collected from the Blink and Chargepoint charging network web sites on station usage and availability to validate and augment the data collected by survey participants making site visits.

Results of the Study

The first results from this study were released at EVS26 on Sunday, May 6th, 2012. The results from both the real-time data and the site survey using data collected through February 25th, 2012, are available in the paper for EVS26.

Additional results with updates to include data collected through May 2, 2012 as well some new results (including the effect of billing rate on usage rates for the ChargePoint network) were presented at Dialog Session 1 on Monday, May 7th, 2012. To view the updated and new charts, download the EVS26 Dialog Session Poster.

We would like to thank the volunteers who have contributed to this study and added to the value the study provides to EV owners, site owners, municipal planners, and others interested in learning about the state of charging infrastructure and the issues in site design that present barriers to charging station use.