Open Charge Point Protocol

Open Charge Point Protocol
Name	Open Charge Point Protocol
Abbreviation	OCPP
Initial release	2010
Developer	Open Charge Alliance
Latest release	2.0.1 (as of 2020)
Type	Communication protocol for electric vehicle charging stations
License	Open standard

Open Charge Point Protocol is an open communications standard for electric vehicle charging stations and central management systems that enables interoperability between charge points and back-end networks. The protocol facilitates remote management, diagnostics, authorization, billing, and firmware updates for charging hardware across networks operated by utilities, fleet operators, and mobility providers. Originating from industry collaborations, the protocol has been adopted by charger manufacturers, energy companies, and transit authorities to reduce vendor lock-in and accelerate deployment of public charging infrastructure.

History

The initiative began under the stewardship of the Open Charge Alliance and saw early development influenced by collaborations among vendors such as Schneider Electric, Siemens, ABB Group, General Electric, and research institutions including Fraunhofer Society and TNO (Netherlands). Early milestones included pilot projects with automakers like Nissan and BMW and utility partnerships involving EDF (Électricité de France) and Enel. Regulatory drivers from authorities including the European Commission, California Air Resources Board, and city programs in Los Angeles and London encouraged standardized interfaces, while funding and demonstrations were supported by programs like the Horizon 2020 framework and grants from agencies such as the U.S. Department of Energy. Subsequent revisions incorporated input from consortia including ISO and IEC working groups and commercial stakeholders like Tesla, Inc. (for interoperability discussions), Volkswagen Group, and service providers such as ChargePoint, Inc. and EVBox. The evolution track paralleled standards work from SAE International and influenced procurement policies in municipalities such as Amsterdam and Berlin.

Protocol Specification

The specification defines message types, event notifications, and data models for transactions, boot notifications, heartbeat messages, meter values, and remote control. It leverages transport technologies like WebSocket and application-layer conventions influenced by protocols such as SOAP and JSON-based APIs used by platforms including Amazon Web Services and Microsoft Azure. Versioning progressed through major releases—early 1.x versions aligning with implementations from vendors like Rolec Services and later 2.0.x editions introducing improved feature sets reflecting inputs from Eurelectric and Transport for London. The data model aligns with elements used in standards such as IEC 61851 and IEC 62196 for connector types and charging modes and complements metadata schemas from organizations like OpenADR and NAESB.

Architecture and Components

The architecture separates charge point firmware, central management systems (CSMS), and ancillary systems such as billing, identity management, and energy management platforms. Key components include charge point controllers manufactured by firms like Delta Electronics, session management systems run by operators such as Blink Charging and Shell Recharge Solutions, and middleware from integrators like Keba AG. Identity and authorization can integrate with systems from Mastercard, Visa, and roaming platforms like Hubject and Gireve. Grid and energy management coordination ties to utilities and programs offered by Iberdrola, RWE, and aggregators such as AutoGrid Systems and Next Kraftwerke.

Implementations and Vendors

Multiple hardware vendors implement the protocol in charge stations built by EVBox, ABB Group, Siemens, Schneider Electric, Keba AG, Delta Electronics, Rolec Services, WaveSense, and Zebra Battery Systems. Software platforms and network operators supporting the protocol include ChargePoint, Inc., EVBox Group, NewMotion, Greenlots (Shell subsidiary), Enel X Way, Allego, Blink Charging, Pod Point, and Virta Ltd. System integrators and firmware suppliers such as OpenERP-adjacent providers, headless cloud platforms like Google Cloud Platform customers, and payment processors such as Stripe and Adyen have been engaged for commercial deployments. Academic implementations and testbeds have been produced by laboratories at Massachusetts Institute of Technology, TU Delft, and Imperial College London.

Standards, Compliance and Interoperability

Compliance efforts link the protocol to international standards bodies including ISO, IEC, and regional regulators like CENELEC. Interoperability testing events have been organized by the Open Charge Alliance alongside plugfests involving vendors such as EVBox and ABB Group, and integration with roaming e-mobility platforms like Hubject and Gireve ensures cross-network transactions. Certification and conformance tools have been developed in collaboration with testing houses like TÜV SÜD and DEKRA, and harmonization with standards such as ISO 15118 for vehicle-to-grid communications and IEC 61851 for conductive charging ensures multi-vendor compatibility.

Security and Privacy

Security provisions address authentication, authorization, and secure transport layers often relying on TLS implementations from vendors like OpenSSL and identity frameworks supported by providers such as Okta and Auth0. Threat modeling considers supply-chain actors including manufacturers like Foxconn and firmware update integrity via code signing practices used by Microsoft and Red Hat. Privacy concerns span transaction data handled by billing firms such as Ingenico and personal data processed under regulations like GDPR and regional laws enforced by authorities such as the European Data Protection Board and national data protection agencies. Cybersecurity assessments reference guidance from agencies like ENISA and national CERT teams, and incident-response playbooks are informed by frameworks from NIST and ENISA.

Adoption and Impact on EV Charging Infrastructure

Adoption by operators including ChargePoint, Inc., EVBox Group, Shell Recharge Solutions, and utilities such as Enel and EDF has accelerated roll-out of interoperable public charging networks in urban centers like Amsterdam, Berlin, San Francisco, and Oslo. The protocol reduced integration costs for municipal programs in cities such as London and Los Angeles and enabled roaming ecosystems linking platforms like Hubject and Gireve to fleets operated by DHL Group and UPS. It influenced procurement policies at transit agencies including Transport for London and fleet electrification projects by companies such as Amazon and IKEA Group, while research at institutions like Imperial College London and MIT studies quantified benefits to grid flexibility, demand response, and reduction in range anxiety. Economic and environmental impacts are examined alongside standards from IEA and policy targets set by entities like the European Commission and state programs in California.

Category:Electric vehicle charging