Open communication between charging station and car

In the ideal charging infrastructure, every element speaks the same language and everyone can participate. Cars communicate with charging stations, charging stations with energy providers, charging stations with charging plazas or with each other, perhaps the network can communicate with a car. There must still be room in between for innovative apps, services about charging cables or other applications that we are not yet familiar with. For example, every electric car must be able to charge at every charging station and every provider of new services for EV charging must be able to participate without barriers. This open communication in the same language is what we call interoperability and it is one of the most important factors on the way to sustainable electric mobility.

An open charging infrastructure for electric vehicles with access for EV drivers and industry players will accelerate the adoption of electric vehicles, encourage innovation and reduce costs. To shape this open EV charging market, ElaadNL invests in open standards projects, roaming solutions and leads and promotes open markets at national and international government level.

Open standards

ElaadNL actively contributes to the development of open standards. Open standards or open protocols ensure that EV charging systems speak the same language. By providing rules and guidelines for data communications, open standards are unleashing new market opportunities for thousands of companies around the world.


OCPP (Open Charge Point Protocol) is the global open communication protocol between the charging station and the central system of the charging station operator. This protocol handles the charging transaction and can also exchange information between the vehicle and the electricity grid. OCPP is an initiative of ElaadNL in the Netherlands and has been expanded and improved over the past eight years by the pioneers in the international EV charging industry. OCPP is currently hosted by the Open Charge Alliance, a Dutch foundation with up to 100 members from 25 countries on 4 continents. OCPP has been downloaded more than 17,000 times by developers around the world and is considered the de facto global standard.


OSCP (Open Smart Charging Protocol) is an open communication protocol between the charge point management system and the energy management system of the land owner or the system of the DSO (Distribution System Operator). This protocol communicates a 24-hour forecast of the available grid capacity. The Service Provider adapts the charging profiles of the electric vehicles within the limits of the available capacity. OSCP is hosted by the Open Charge Alliance.


OCPI (Open Charge Point Interface) is an open protocol between operators and service providers. This internationally supported independent interface supports the affordability and availability of charging infrastructure. ElaadNL is one of the initiators of EV Box, The New Motion, Greenflux and Last Mile solutions, among others. The protocol provides accurate charging station information such as location, availability and pricing, manages bilateral roaming and provides real-time billing and mobile access to charging stations. OCPI is facilitated by the Netherlands Knowledge Platform Charging Infrastructure (NKL).

Open ADR

Open ADR (Open Automated Demand Response) is an open and standardized way for electricity suppliers and system operators to communicate DR signals with each other and with their customers in a common language over an existing IP-based communications network, such as the Internet. As the most comprehensive standard for automated demand response, OpenADR has gained widespread support across the industry. ElaadNL is developing OpenLEADR together with LF Energy.

IEC 61851 and ISO 15118

Standards such as ISO/IEC 15118 and IEC 61851-1 have been developed to ensure basic level interoperability of front-end communication and signaling processes for smart charging between electric vehicles and charging stations. ISO/IEC 15118 ensures communication between the electric vehicle and the charging station. IEC 61850 communicates between the charging station and the energy supplier.
Also view the project PKI – Public Key Infrastructure in which ISO15118 and the implementation of an open network are researched and tested.


For the adaptation of electric vehicles in Europe, EV drivers must be able to charge at any charging station in any country. There are several roaming options available in Europe for this. While these capabilities differ to some extent, they all share the same goal: to open up the EV charging infrastructure to all EV drivers. Allowing roaming will allow for innovation, accelerate EV adoption and improve the customer experience. In addition, roaming is already mandatory in some European countries, in anticipation of future European mandates.

ElaadNL actively contributes to roaming via its platform, a platform with the aim of exchanging roaming authorization, charging transaction and charging point information.