The CPO's Guide to EV Roaming

As EV adoption accelerates, one challenge continues to surface across markets: fragmentation. Drivers are still navigating multiple apps, accounts, and payment systems just to access public charging. For Charge Point Operators (CPOs), this fragmentation doesn’t just affect user experience, it limits utilisation, slows revenue growth, and creates operational inefficiencies.

EV roaming is emerging as a critical enabler of scale.

This guide breaks down what EV roaming is, why it matters for CPOs, and how to approach it thoughtfully.

TL;DR - key takeaways on EV roaming

• EV roaming allows drivers to access multiple charging networks using a single app or account

• For CPOs, roaming increases utilisation, revenue potential, and network relevance

• Open standards like OCPI are key to enabling scalable roaming partnerships

• Roaming introduces complexity around pricing, settlement, and data exchange

• A centralized roaming hub simplifies operations while preserving control

• CPOs that adopt roaming early are better positioned for long-term growth

EV roaming enables interoperability between different charging networks. It allows an EV driver registered on one platform to charge at stations operated by another CPO, without needing a new app, wallet, or account.

Behind the scenes, roaming relies on standardized protocols that manage:

• Charger discovery and availability

• Authentication and authorization

• Pricing information

• Charging session data

• Billing and settlement between operators

For the driver, this feels simple. For CPOs, it requires careful coordination where technology and standards play a central role.

Why EV Roaming Matters for CPOs

1. Higher Utilisation Without More Hardware

One of the biggest challenges CPOs face is underutilisation, especially in the early years of deployment. Roaming expands the addressable user base overnight, allowing chargers to be accessed by drivers beyond a single app ecosystem. This means:

• Faster ramp-up of usage

• Better return on infrastructure investment

• Reduced reliance on site-specific demand

2. Improved Driver Experience, Stronger Network Value

Drivers increasingly expect charging to “just work.” Networks that are closed or difficult to access risk being bypassed in favour of more interoperable alternatives.

Roaming helps position a CPO as part of a broader, driver-friendly ecosystem without sacrificing brand identity or operational control.

3. Competitive Positioning in a Consolidating Market

As markets mature, standalone networks become less attractive. CPOs that are interoperable are easier to integrate into fleets, property portfolios, and regional platforms. Roaming is often a prerequisite for:

• Fleet partnerships

• Property owner tenders

• Regional or national charging initiatives

How EV Roaming Works: A Practical Overview

Protocols and Standards

Most roaming ecosystems rely on open protocols such as the Open Charge Point Interface (OCPI). OCPI allows systems operated by different companies to exchange standardized data securely and reliably. This includes:

• Station metadata (location, connectors, power ratings)

• Real-time availability

• Tariffs and pricing structures

• Session records for billing

Using open standards reduces integration friction and avoids vendor lock-in.

Operational Considerations for CPOs

Pricing and Tariff Transparency

Roaming requires clear rules around pricing. CPOs must decide:

• Whether roaming prices differ from direct users

• How tariffs are displayed to external platforms

• How to manage peak pricing or site-specific rules

Consistency and transparency are critical to avoid driver dissatisfaction and disputes.

Settlement and Revenue Reconciliation

Each roaming session generates financial flows between parties. Without automation, settlement can become complex and error-prone. A well-designed roaming setup ensures:

• Accurate session data exchange

• Automated clearing and reconciliation

• Predictable cash flows

Data Ownership and Visibility

Roaming should not mean losing visibility. CPOs still need access to:

• Charger performance data

• Utilisation trends

• Downtime and fault alerts

A centralized system ensures roaming enhances, rather than obscures, operational insight.

Common Misconceptions About EV Roaming

Misconception 1: “Roaming means losing control of our network.”

Truth: In reality, roaming allows controlled access under defined commercial and technical rules.

Misconception 2: “It’s only for large operators.”

Truth: Smaller CPOs often benefit the most, gaining reach without expanding infrastructure.

Misconception 3: “Roaming is just a commercial agreement.”

Truth: Technology readiness is just as important as commercial terms.

Preparing Your Network for Roaming

Before joining a roaming ecosystem, CPOs should assess:

• CSMS compatibility with open protocols

• Data accuracy and charger uptime

• Pricing logic and billing workflows

• Support processes for roaming-related issues

Roaming works best when operational fundamentals are already strong.

FAQ - EV roaming

Q: Does roaming affect branding?

A: No. Drivers may discover chargers via different apps, but the physical network and operator identity remain intact.

Q: Is roaming secure?

A: When implemented using industry standards and proper authentication, roaming is designed to be secure and auditable.

For more frequently asked questions, read this article: EV roaming FAQs for CPOs

EV roaming is about future-proofing your charging business. If you’re evaluating how roaming fits into your network strategy, Eigen Digital helps CPOs design interoperable, scalable, and operationally sound charging ecosystems. Explore how energy intelligence and roaming infrastructure can support your next phase of growth. Contact us!