EV roaming is transforming the charging landscape, enabling drivers to access stations outside their home network and helping CPOs expand reach, utilization, and revenue. Here, we answer the most common questions CPOs have about EV roaming from technical setup to business impact so you can make informed decisions and position your network for growth.

TL;DR - EV roaming for CPOs

• Roaming allows CPOs to attract more drivers, increase utilization, and tap new revenue streams.
• There are multiple roaming models: peer-to-peer, hub-based, and single-network.
• Open protocols like OCPI and OCPP are essential for seamless integration and interoperability.
• Roaming setup involves agreements, technical integration, data exchange, and ongoing management.

1. What is EV roaming and why should CPOs care?

EV roaming enables drivers from different networks (via their eMobility Service Provider, or eMSP) to access and pay for charging at your stations without needing a separate account or app. For CPOs, this means increased station utilization, access to new customer segments, expanded geographic reach, and new revenue streams.

2. What are the main types of EV roaming models?

Peer-to-Peer (P2P) Roaming: Direct agreements between CPOs and eMSPs using protocols like OCPI. Offers flexibility but can become complex as the number of partners grows.

Hub-Based Roaming: A central roaming hub (e.g., Hubject, Gireve) connects multiple networks, simplifying integration and access to many partners through a single connection.

Single-Network Roaming: All charging and users are managed within one provider's ecosystem - no external roaming, but limited reach.

3. How does the technical setup for roaming work?

Getting started with EV roaming is a straightforward process once you break it down. First, you sign roaming agreements with your chosen partners or roaming hubs. This step sets out the commercial terms and technical details for how you will work together. Next comes the system handshake where your charging station management system (CSMS) securely connects to your partner or hub, exchanging credentials for data access so both systems can communicate safely. Once connected, your systems will start sharing important information in real time: details about your charging stations, their status, pricing, and transaction records. After everything is up and running, you continue to maintain and update your roaming data, manage user authorizations, and handle financial settlements.

4. What protocols are used for EV roaming?

OCPI (Open Charge Point Interface): The most widely adopted standard for EV roaming. It enables CPOs and eMSPs to exchange data on charging station locations, availability, pricing, and billing. OCPI supports multiple roaming models and facilitates interoperability between different networks.

OCPP (Open Charge Point Protocol): Used primarily for communication between charging stations and backend management systems. While not a roaming protocol itself, OCPP is essential infrastructure for any roaming setup.

Using standardized protocols reduces technical barriers, ensures compatibility across systems, and future-proofs your network as the industry evolves.

5. What are the business benefits of EV roaming for CPOs?

Roaming directly addresses one of the biggest challenges in EV charging: underutilization. By opening your network to drivers from other eMSPs, you expand your potential user base without significant additional investment. More users mean more charging sessions, greater energy throughput, and increased revenue, particularly during off-peak periods and at sites that haven't yet built strong local demand. Roaming also enhances your network's visibility. When your stations are listed across multiple apps and platforms, you benefit from organic discovery by EV drivers who may not have found you otherwise. This broader reach can accelerate the growth of your own subscriber base and strengthen partnerships with fleet operators and corporate clients.

6. What challenges should CPOs anticipate when implementing roaming?

While the benefits are clear, roaming introduces complexity that requires careful planning. Billing and settlement become more intricate when multiple parties are involved. You will need to establish clear pricing rules for roaming sessions, decide whether to apply a premium for external users, and set up systems to handle the financial flows between your network, the roaming hub, and the eMSP. Data quality and consistency are also important. Roaming partners rely on accurate, up-to-date information about your stations, including location, availability, and pricing. Ensuring that this data is consistently maintained and shared is critical for a smooth roaming experience. Finally, ongoing management of roaming agreements and technical integrations requires dedicated attention, particularly as your network scales.

7. How do I get started with EV roaming?

Start by assessing your current infrastructure and ensuring your CSMS supports OCPI or another relevant roaming protocol. From there, identify potential roaming partners or hubs that align with your business goals and geographic focus. Engaging with an experienced roaming platform or hub can simplify the process significantly. These platforms handle much of the technical complexity and provide access to a broad network of eMSPs and CPOs. At Eigen Digital, we support CPOs in navigating the roaming landscape, from protocol implementation to partnership facilitation. Contact us to explore how we can help you unlock the full potential of EV roaming for your network.