EV Roaming (also known as Interoperability) allows EV drivers to use a single identification method (e.g., one RFID card or App) to charge and pay across different Charge Point Operators’ (CPO) networks. It eliminates barriers between operators, similar to how mobile phone users automatically connect to local networks when traveling abroad.

Analysis from an Application Environment Perspective

The core of roaming is “seamless connectivity,” primarily applied in cross-region travel and open markets with multiple operators.

• Cross-Border/Inter-State Long-Distance Travel:
  In Europe or North America, drivers crossing borders don’t need to download every local charging App. Via roaming hubs like Hubject or Gireve, drivers can use their home E-Mobility Service Provider (eMSP) account to activate chargers in foreign regions. This is crucial for building continuous e-mobility corridors.
• Highly Fragmented Urban Public Charging:
  In cities with a dozen different charging brands, the application of roaming protocols (like OCPI) allows aggregator platforms (such as navigation Apps) to activate all partner chargers directly. This drastically simplifies the user journey, avoiding the frustration of having “a phone full of charging Apps.”