To date, OCPP is not as highly adopted in the U.S. among other vendors because the U.S. market came into being largely through a number of large [[United States Department of Energy|U.S. Department of Energy (DOE)]] grants that let the network provider choose their protocol. Since most of the network providers were also charge station manufacturers, this served as motivation for an EV infrastructure land grab through proprietary communication protocols, not OCPP.
The U.S. Department of Energy has made charge station network interoperability a priority in 2013 by launching a new center that will work to ensure that vehicles, charging stations, communications and networking systems work in unison with the electric grid. The Electric Vehicle-Smart Grid Interoperability Center, located at [[Argonne National Laboratory]] just outside Chicago, works to harmonize emerging EV and [[Smart grid|smart grid technologies]].<ref>{{cite web|url=http://energy.gov/articles/energy-department-partners-eu-electric-vehicle-and-smart-grid-coordination |title=Energy Department Partners with EU on Electric Vehicle and Smart Grid Coordination | Department of Energy |publisher=Energy.gov |date=2013-07-19 |accessdate=2013-10-12}}</ref>
