What Is EV Roaming? 4 Things for You to Know It All

What Is EV Roaming? 4 Key Things to Know It All

Last Updated: 15/07/2024

Table of Contents

What Is EV Roaming? 4 Key Things to Know It All

Table of Contents

As the world shifts towards sustainable transportation, the electric vehicle (EV) industry continues to experience rapid growth. However, one of the key challenges for EV owners is the accessibility and convenience of charging their vehicles, especially when traveling beyond their local area. This is where EV roaming comes into play. Imagine being able to charge your EV at any station, regardless of the network, with ease and without the hassle of multiple memberships or payment methods. EV roaming makes this possible by allowing seamless access to a wide range of charging infrastructures, promoting a more flexible and user-friendly experience for EV drivers. In this blog, we will delve into the concept of EV roaming, explore its benefits, and understand the different models and protocols that enable this innovative solution. Whether you’re an EV owner, a charging network operator, or simply interested in the future of electric mobility, this comprehensive guide will provide valuable insights into the world of EV roaming.

What is EV Roaming?

EV Roaming, also known as eRoaming, refers to the ability of electric vehicle owners to charge their vehicles at charging stations operated by different charging network providers. It allows EV owners to access charging infrastructure beyond their home network, promoting convenience and flexibility. EV Roaming ensures that drivers can charge their vehicles at various locations without the need for multiple subscriptions or access cards.

what is ev roaming and how does it work

How Does EV Charging Roaming Work?

  • Interoperability Agreements: Charging network operators enter into agreements to allow their customers to use each other’s charging stations. These agreements outline the terms, such as pricing, billing, and data exchange.
  • Roaming Platforms: Centralized platforms or hubs facilitate communication and data exchange between different networks. These platforms handle authentication, billing, and real-time information sharing about station availability and pricing.
  • Roaming Protocols: Standardized protocols like OCPI (Open Charge Point Interface), OICP (Open InterCharge Protocol), and eMIP (eMobility Inter-operation Protocol) enable seamless data exchange. These protocols ensure that information such as user authentication, session details, and billing is communicated accurately between networks.
  • User Experience: For the EV driver, roaming is straightforward. They use their existing membership or access card to authenticate at a participating charging station. The roaming platform verifies their credentials and initiates the charging session. Billing is processed through their home network, making the experience seamless.

In essence, EV Charging Roaming leverages technology and cooperation between networks to provide a hassle-free charging experience, expanding the accessibility and convenience of charging for EV drivers.

electric vehicle driver seeking for ev charging points

Benefits of EV Roaming

EV roaming has the potential to increase the adoption of electric vehicles and improve the charging experience for EV drivers, while also providing benefits for charging network operators and the environment.

Increased Access to Charging Infrastructure

EV roaming allows EV drivers to access charging infrastructure beyond their home network, increasing the range of travel and reducing range anxiety.


EV roaming enables interoperability between charging networks, allowing EV drivers to use different charging stations without the need for multiple membership accounts or payment methods.


EV roaming simplifies the charging process by providing a seamless experience for EV drivers, eliminating the need to search for charging stations or carry multiple access cards or payment methods.

Cost Savings

EV roaming can reduce the cost of charging for EV drivers by enabling access to more affordable charging stations and eliminating the need for multiple memberships or payment methods.

Increased Revenue

EV roaming can increase revenue for charging network operators by enabling access to more customers and reducing the barriers to entry for new operators.

Environmental Benefits

EV roaming promotes the adoption of electric vehicles, which can reduce greenhouse gas emissions and improve air quality.

benefits of ev roaming

Models for EV Roaming

There are primarily two models for EV Roaming:

Hub and Spoke Model

In this model, a central hub acts as an intermediary between different charging network operators. The hub facilitates communication, data exchange, and billing processes between the involved parties, allowing seamless roaming for EV owners. The hub is responsible for handling the authentication and billing processes, ensuring that EV owners are charged for the energy consumed.

Peer-to-Peer Model

This model emphasizes direct communication between charging network operators. It enables bilateral agreements between operators, eliminating the need for a central hub. Peer-to-peer roaming simplifies the process and reduces costs associated with intermediaries. In this model, charging network operators establish direct communication channels to exchange information related to pricing, availability, and charging session data.

EV Roaming Protocols

Several EV roaming protocols have been developed to facilitate interoperability and standardized communication between different charging networks. Let’s explore some prominent EV Roaming Protocols:

Open Charge Point Interface (OCPI)

OCPI is an open protocol that focuses on enabling communication between charging network operators. It allows for real-time data exchange, such as availability, pricing, and charging session information. OCPI supports both Hub and Spoke and Peer-to-Peer models.

Open InterCharge Protocol (OICP)

OICP is another widely adopted protocol that supports roaming between various charging networks. It standardizes communication for charging station management, pricing, and authentication. OICP is designed to support both Hub and Spoke and Peer-to-Peer models.

electric vehicle owner looking for charging points on the phone

Open Clearing House Protocol (OCHP)

OCHP facilitates cross-network communication and roaming services. It enables charging network operators to exchange information related to authentication, billing, and charging infrastructure details. OCHP is designed to support Hub and Spoke models.

eMobility Inter-operation Protocol (eMIP)

eMIP is designed to enable interoperability between different eMobility service providers. It ensures seamless roaming by providing standardized interfaces for data exchange, billing, and authentication. eMIP supports both Hub and Spoke and Peer-to-Peer models.

Click here to learn more about these four EV roaming protocols.

Differences Among Different EV Roaming Protocols

While all EV Roaming Protocols aim to facilitate interoperability and standardized communication between charging networks, there are notable differences between them. Let’s explore the unique features and characteristics of each protocol:

P2P Roaming Supported Supported Supported
Hub Roaming Supported Supported Supported Supported
Charge Point Information Supported Supported Supported
Authorizing Charge Sessions Supported Supported Supported Supported
Remote Start/Stop Transactions Supported Supported Supported Supported
Reservations Supported Supported Supported
Smart Charging Support Supported
Billing Supported Supported Supported Supported
Calibration law (Eichrecht) support Supported Supported
Ad-hoc payments Supported
Charge point search module Supported
Frequency Real-time Real-time Asynchronous Real-time


EV Roaming is a critical aspect of the electric vehicle industry that promotes convenience and flexibility for EV owners. Different models and protocols enable seamless communication and data exchange between different charging networks, ensuring that EV owners can charge their vehicles at various locations without any hassle or inconvenience. As the electric vehicle industry continues to grow, it is essential to adopt standardized protocols that promote interoperability and ensure seamless roaming experiences for EV owners.

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