The eMobility Interoperation Protocol (eMIP) gives structure to data exchange across EV charging services. The eMIP supports roaming, pricing, contracts, and session flow between market actors. eMIP-enabled communication remains uniform across networks that use different platforms. The eMIP framework reduces manual integration through clear message rules. The eMobility Interoperation Protocol workflows increase trust across CPOs, eMSPs, and service partners. The adoption of eMIP rises in environments that require stable roaming and simple data exchange. The eMIP model creates value for EV drivers, operators, and backend providers through consistent access, transparent tariffs, and reliable session records.
What is the eMobility interoperation protocol?
The eMobility Interoperation Protocol (eMIP) is a data exchange method for EV charging interoperability. The eMIP solves fragmented communication across EV networks through shared formats for roaming, session flow, and tariff exchange. The core eMIP functions are identification, authorization, session reporting, price sharing, and settlement. The eMIP enables roaming by linking mobility contracts to charging networks through standardized identifiers.
The eMIP supports communication between charge point operators, mobility service providers, and clearing houses through mapped interfaces for contract checks and session confirmation. The eMIP transports authentication data, charging session data, tariff information, and billing records. The eMobility Interoperation Protocol relates to OCPI, OCPP, and ISO 15118 by covering cross-network data exchange rather than hardware control or vehicle-to-charger communication. The eMIP fits within the interoperability stack as the roaming and market-settlement layer.
How does the eMIP work?
The eMobility Interoperation Protocol (eMIP) operates through a structured workflow that moves authentication, roaming activation, session data, and settlement across EV market actors. The eMobility Interoperation Protocol begins its communication workflow by validating a mobility contract between an MSP and a CPO through shared identifiers and mapped authorization rules. The eMIP handles authentication by passing contract references to the CPO, which confirms session rights before activation. The eMIP supports roaming and session initiation by transmitting contract status, access rights, and start commands.
The eMobility Interoperation Protocol exchanges tariff data, meter values, session status updates, and consumption records during charging. Session completion and billing within the eMIP rely on final values sent to clearing houses for settlement. Secure and structured communication in the eMIP workflow comes from defined schemas and consistent identifiers. The position of the eMobility Interoperation Protocol in the interoperability stack is the roaming and settlement layer between OCPI, which manages roaming APIs, and OCPP, which manages charger control. Architectural elements within the eMIP include message routing, identifiers, roaming hub links, and operator-to-operator communication paths.
How does the eMIP manage communication between systems?
The eMobility Interoperation Protocol (eMIP) manages communication between systems through structured message formats, routing rules, and roaming workflows that link CPOs, MSPs, and clearing houses. The way the eMIP structures message exchange is by using defined schemas for authorization, tariffs, and session records. The eMobility Interoperation Protocol applies a hub-based or operator-to-operator model depending on the roaming arrangement.The eMIP also manages identification through CPO IDs, MSP IDs, and contract IDs that match market actors to their roles. The way the eMIP transmits authentication requests is by sending contract references to the CPO, which validates access rights through shared identifiers. The eMobility Interoperation Protocol supports message integrity through version control, error handling rules, and strict field definitions.
The eMIP exchanges authorization data, tariff data, session data, and consumption packets across the charging workflow. Session actions receive real-time support through structured messages that move between MSPs and CPOs. Secure communication in eMIP relies on encryption, validation steps, and digital signatures defined by market agreements. Roaming hub communication flows through clearing houses that process contract checks and settlement records. Settlement tasks use asynchronous communication paths that handle delayed processing without disrupting roaming behavior.
How are messages structured and data exchanged in the eMIP?
The eMobility Interoperation Protocol (eMIP) structures messages through standardized data models, schemas, and transmission rules that define how CPOs, MSPs, and clearing houses exchange information. Message structure in the eMIP relies on fixed fields, identifiers, and schemas that follow common formats such as JSON or XML. Mandatory elements in the eMIP messages include sender ID, receiver ID, timestamps, contract identifiers, and session references. Message categories within the eMIP cover authorization requests, session updates, tariff information, and billing or settlement data. Real-time exchange within the eMIP supports session actions, while asynchronous paths handle settlement and reporting. Validation checks, field constraints, and integrity rules ensure message accuracy before processing.
Consistent interpretation across systems in the eMIP comes from aligned field names, identifiers, and domain rules. Structured error codes, acknowledgments, and status responses guide systems through acceptance, rejection, or correction steps. Each participating platform maps internal fields to standardized formats before sending data into the eMIP workflow. Sensitive information receives protection through encryption, hashing, and secure transport channels that maintain privacy during exchange.
What is the technical architecture of the eMIP?
The technical architecture of the eMIP is a layered roaming and interoperability framework built on message schemas, communication interfaces, identification systems, and routing mechanisms that link CPOs, MSPs, and clearing houses. Architectural layers within the eMIP include a communication layer for transport, a data schema layer for message structure, a security layer for protection, and a routing layer for orchestration. Interface points across the technical architecture of the eMIP define where CPOs, MSPs, and roaming hubs exchange authorization, session data, tariff information, and settlement records. Routing components in eMIP’s technical architecture use operator IDs, contract IDs, and message headers to direct traffic to the correct market actor. Real-time communication for session activation appears in the technical architecture alongside asynchronous processing paths that support settlement.
Functional blocks within the technical eMIP architecture include authorization modules, session management modules, and billing or settlement modules that organize workflows. Integration with the interoperability stack places the technical architecture next to OCPI for roaming APIs and OCPP for charger control, while ISO 15118 manages EV-to-charger communication. Security within the technical architecture of the eMIP relies on TLS, digital signatures, and authentication tokens that protect exchanged data. Scalability in the technical architecture comes from hub-based routing, modular message definitions, and standardized endpoints. Transport within the technical architecture of the eMobility interoperation protocol uses HTTPS, REST endpoints, and queued models supported by clearing houses.
What are the key functions and features of the eMIP?
The key functions and features of the eMIP are listed below.
- Real-Time Session Information Exchange: The eMIP transfers live session status, meter values, and consumption data between MSPs and CPOs.
- Tariff and Pricing Data Handling: The eMIP delivers structured tariff information that supports clear roaming price communication.
- Contract and User Identification: The eMIP links charging requests to contract IDs and user identifiers that confirm access rights.
- Roaming & Network Access: The eMIP enables cross-network charging by routing authorization and session messages across operators.
- Reporting & Settlement: The eMIP sends final session records to clearing houses that process billing and settlement workflows.
Real-Time session information exchange
Real-Time Session Information Exchange in the eMIP is the continuous and standardized transmission of charging session data between CPOs, MSPs, and clearing houses. The eMobility Interoperation Protocol (eMIP) supports real-time data flow by sending structured messages that report session start events, updates, pause or resume actions, and stop events. Mandatory fields in the eMIP include meter values, timestamps, connector ID, and contract ID. Update intervals in the eMIP follow predefined rules set by roaming agreements and system capabilities. Data accuracy and synchronization in the eMIP depend on validation checks, field constraints, and strict message formatting.
Real-time session information exchange communicates tariff shifts, power adjustments, or session status changes without delay to support correct roaming billing and user-facing information. Connection issues within the eMIP are handled through buffering rules, retry mechanisms, and asynchronous fallback paths that preserve session integrity when real-time exchange is disrupted. Consistent data delivery in the eMobility Interoperation Protocol (eMIP)remains supported even when network conditions vary.
Tariff and pricing data handling
Tariff and pricing data handling in the eMIP is the standardized exchange of pricing details, tariff structures, and cost parameters between CPOs, MSPs, and clearing houses. The eMIP structures and transmits tariff data through defined schemas that include energy prices, time-based fees, flat fees, and dynamic pricing elements. Pricing models in the eMIP appear through simple formats, tiered structures, time-of-use fields, and dynamic indicators. Consistency between CPO-set tariffs and MSP-presented prices is maintained in the eMobility Interoperation Protocol (eMIP) through synchronized updates and shared identifiers. Update intervals within the eMIP follow defined rules that explain how new tariffs interact with active sessions. Tariff data in the eMIP links with session information to support accurate billing calculations.
Tariff and pricing data handling ensures pricing accuracy through validation steps, versioning fields, and timestamps. Currency details, tax parameters, and regional pricing rules form part of the data exchanged through the eMIP. Tariff integrity within the eMIP is protected through secure transport channels and encrypted exchange mechanisms. Structured pricing information in the eMobility Interoperation Protocol (eMIP) keeps roaming partners aligned even when internal systems vary.
Contract and user identification
Contract and user identification in the eMIP is the standardized mechanism for identifying EV drivers, mobility contracts, and operator accounts to enable accurate authorization, roaming, and billing across interoperable charging networks. Contract identifiers in the eMIP use fixed fields that reference an MSP-issued contract ID linked to a user token or UID. User identities in the eMIP appear through contract IDs, eMSP identifiers, and user tokens that move through authorization workflows. Identifier mapping within the eMIP connects MSPs, CPOs, and clearing houses through shared operator IDs and structured routing rules. Mandatory elements in the eMIP include operator ID, contract reference, and user token. Authorization checks in the eMobility Interoperation Protocol (eMIP) validate identifiers by matching contract details with active records stored by the MSP.
Contract and user identification prevents conflicts or duplication through controlled namespaces and fixed ID formats. Revoked, expired, or updated identifiers in the eMIP are managed through update messages that replace out-of-date entries with valid versions. Protection of contract and user data in the eMIP relies on encryption and secure transport channels. Integration of identification within the eMobility Interoperation Protocol (eMIP) links contract data to session initiation, session tracking, and billing, ensuring that all charging activities remain associated with the correct user and contract.
Roaming and network access
Roaming and network access in the eMIP is the protocol-driven process that enables EV drivers to use charging stations outside their home network by facilitating standardized authorization, data exchange, and settlement between CPOs, MSPs, and clearing houses. Roaming functions in the eMIP operate by transmitting contract identifiers, operator IDs, and authorization messages across networks that follow shared schemas. Network access rights in the eMobility Interoperation Protocol (eMIP) are granted through steps that validate the mobility contract held by the MSP, confirm user permissions, and deliver authorization responses to the CPO. Authorization workflows in the eMIP match contract details with active entries stored by the MSP. Compatibility across heterogeneous networks in the eMIP comes from standardized fields, routing rules, and uniform message structures.
Roaming and network access exchange session information for billing, monitoring, and clearing through structured updates sent during and after charging. Support for roaming hubs and clearing houses in the eMIP appears through routed authorization messages, session data, and settlement records transmitted via centralized or operator-to-operator paths. Reliability and security in the eMobility Interoperation Protocol (eMIP) rely on encrypted transport, validation rules, and real-time communication for session-critical actions. Enforcement of roaming restrictions, permissions, and contract validity in the eMIP occurs through identifier checks and contract status matching.
Reporting and settlement
Reporting and settlement in the eMIP is the standardized process for exchanging charging session summaries, financial records, and reconciliation data between CPOs, MSPs, and clearing houses to ensure accurate invoicing, cost allocation, and roaming settlement. Reporting data in the eMIP is structured through schemas that include session identifiers, meter values, tariffs applied, duration, contract IDs, and operator IDs. Settlement support in the eMIP relies on messages that transmit final costs, applied pricing models, and consumption records to clearing houses. Reporting triggers in the eMIP include end-of-session events, periodic batches, and scheduled intervals. Discrepancies across partners are addressed in the eMIP through validation steps and reconciliation rules.
Reporting and settlement ensure accuracy, auditability, and non-repudiation through strict field definitions, timestamps, and version controls. Currency data, taxation fields, and regional pricing variations are managed within the settlement schema of the eMIP. Protection of reporting and financial data in the eMobility Interoperation Protocol (eMIP) uses encryption, secure transport, and integrity checks. Links between settlement reports and active contracts or operator roles are maintained in the eMIP through shared identifiers that keep financial workflows aligned across roaming networks.
What are the core market roles in the eMobility Interoperation Protocol (eMIP)?
The core market roles in the eMobility Interoperation Protocol (eMIP) are the actors that manage authorization, session data exchange, tariff handling, and settlement across interoperable charging networks. The eMIP roles include charge point operators, mobility service providers, roaming hubs, and clearing houses that work together through standardized identifiers and structured messages.
- Charge point operator (CPO): The eMIP assigns the CPO responsibility for delivering authorization checks, sending session data, applying tariffs, and providing settlement information.
- Mobility service provider (MSP): The eMIP assigns the MSP responsibility for managing contract IDs, validating user rights, receiving session updates, and presenting tariffs to drivers.
- Roaming hub: The eMIP assigns the roaming hub responsibility for routing authorization messages, session data, and settlement records across multiple networks.
- Clearing house: The eMIP assigns the clearing house responsibility for processing financial records, reconciling costs, and generating settlement outputs.
- Supporting registries or directories: The eMIP assigns these supporting roles responsibility for maintaining operator identifiers, contract namespaces, or routing tables when required by roaming agreements.
What is the role of eMIP in the eMobility ecosystem?
The role of eMIP in the eMobility ecosystem is to provide a formal, high-level interoperability framework that enables roaming, standardized communication, and consistent data exchange across EV charging networks. The eMIP facilitates roaming by linking disparate charging systems through uniform identifiers, shared authorization steps, and structured session workflows. The eMobility Interoperation Protocol (eMIP) supports standardized communication between CPOs, MSPs, and clearing houses through fixed message schemas that transmit authorization, session data, tariff details, and settlement records. The eMIP ensures consistency by enforcing validation rules, synchronized identifiers, and predictable routing behavior.
The role of eMIP in the eMobility ecosystem improves transparency, reliability, and compatibility across networks that use different platforms or regional standards. The eMIP complements protocols such as OCPI, OCPP, and ISO 15118 by operating in the roaming and settlement layer rather than charger control or EV-to-charger communication. The eMobility Interoperation Protocol (eMIP) contributes to ecosystem scalability by enabling networks to add roaming partners without bespoke integrations.
What are the main use cases of the eMIP?
The main use cases of eMIP are listed below.
- Roaming authorization: The eMIP verifies contract rights across networks and enables users to start charging on foreign CPO systems.
- Session data exchange: The eMIP transmits session events and meter values that support monitoring, billing, and operational transparency.
- Tariff distribution: The eMIP shares pricing rules between operators and service providers to ensure consistent roaming cost presentation.
- Billing and settlement: The eMIP delivers structured financial records to clearing houses for reconciliation and cost allocation.
- Operator-to-operator communication: The eMIP connects CPOs and MSPs through routing rules that manage identifiers, authorization steps, and session updates.
What is the difference between eMIP, OCPP, OCPI and OCSP?
The difference between eMIP, OCPP, OCPI and OCSP is the distinct purpose each protocol serves within the EV charging communication stack. The eMIP operates in the roaming and settlement layer where CPOs, MSPs, and clearing houses exchange authorization data, tariff details, session information, and financial records. The OCPP operates in the charger control layer where the CPO communicates directly with the charging station to manage technical commands, status events, and configuration. The OCPI operates in the roaming API layer where CPOs and MSPs exchange location data, tariff information, token validation results, and session summaries. The OCSP operates in the certificate validation layer where systems verify the status of digital certificates used for secure communication.
The difference between eMIP, OCPP, OCPI and OCSP becomes clear when examining the actors, data types, and workflow boundaries. The eMIP connects MSPs, CPOs, and clearing houses through roaming and billing workflows. The OCPP connects CPO systems with physical chargers through technical commands and device events. The OCPI connects CPOs and MSPs through roaming interfaces that share pricing, token rules, and session updates. The OCSP connects systems with certificate authorities by confirming whether a digital certificate is valid or revoked. Each protocol influences interoperability in its layer and cannot replace the others because each provides unique functions that span charger control, roaming, financial settlement, and security validation.
What are the main benefits of using the eMIP?
The main benefits of using the eMIP are listed below.
- Improved roaming access: The eMIP enables seamless charging across networks through standardized authorization and structured roaming workflows.
- Higher data accuracy: The eMIP increases reliability in session reporting and tariff exchange through fixed fields and validation rules.
- Clear tariff communication: The eMIP reduces billing ambiguity by sending structured pricing data that aligns CPO and MSP views.
- Consistent settlement processes: The eMIP simplifies reconciliation by routing financial records through unified settlement messages.
- Better interoperability: The eMIP strengthens compatibility across systems through shared identifiers and uniform message formats.
- Stronger security: The eMIP protects sensitive contract, billing, and session data through secure transport and encryption.
- Enhanced scalability: The eMIP reduces integration effort by allowing new partners to join roaming networks without custom interfaces.
- Improved driver experience: The eMIP delivers stable authorization, predictable billing, and dependable roaming access that support consistent charging journeys.
Benefits for EV drivers and eMSPs
The main benefits for EV drivers and eMSPs, that the eMIP provides, are stable roaming access, transparent pricing, and consistent authorization. The eMIP improves interoperability for EV drivers and eMSPs by linking networks through shared identifiers and structured authorization steps. The eMIP streamlines session management, tariff visibility, and billing workflows for EV drivers and eMSPs by transmitting uniform session updates and pricing fields. The eMobility Interoperation Protocol (eMIP) increases reliability for EV drivers and eMSPs through validation checks that reduce errors during roaming.
Benefits for EV drivers and eMSPs from the use of the eMIP include reduced friction in cross-network charging, clearer session information, and fewer inconsistencies in tariff presentation. The eMIP supports long-term growth for EV drivers and eMSPs through standardized data exchange that enables broader roaming coverage and better platform compatibility.
Benefits for charge point operators (CPOs)
The main benefits for charge point operators (CPOs), that the eMIP provides, are accurate authorization, structured session reporting, and simplified settlement. The eMIP improves interoperability for CPOs by standardizing communication with MSPs and clearing houses. eMIP streamlines processes for CPOs by delivering predictable authorization responses, session updates, and tariff synchronization. The eMobility Interoperation Protocol (eMIP) increases reliability for CPOs through fixed message schemas that reduce system mismatches.
Benefits for charge point operators (CPOs) from the use of the eMIP include lower integration effort, clearer financial reconciliation, and improved support for roaming users. The eMIP supports long-term growth for CPOs through scalable communication rules that accommodate new partners and expanding roaming networks.
Benefits for the eMobility ecosystem
Benefits for the eMobility ecosystem, that the eMIP offers, are improved interoperability, consistent data exchange, and aligned roaming workflows. The eMobility Interoperation Protocol (eMIP) improves ecosystem reliability by defining shared formats for authorization, session events, tariffs, and settlement. The eMIP streamlines cross-network communication by enabling predictable behavior across diverse systems. The eMIP also increases compatibility across the ecosystem through identifiers and routing rules that unify CPOs, MSPs, and clearing houses.
Benefits for the eMobility ecosystem include lower fragmentation, more stable roaming access, and clearer financial settlement across markets. The eMIP supports long-term growth for the ecosystem by enabling scalable roaming frameworks and encouraging innovation across EV charging services.
What are the challenges and limitations of the eMIP?
The main challenges and limitations of the eMIP are listed below.
- Uneven market adoption: The eMIP depends on broad ecosystem participation, which creates gaps when networks adopt different standards or delay implementation.
- Integration overhead: The eMIP requires mapping internal systems to standardized schemas, which increases workload for partners with legacy platforms.
- Protocol complexity: The eMIP contains structured fields and routing rules that increase the effort required to maintain compliance.
- Inconsistent data interpretation: The eMIP limits reliability when networks interpret fields differently or fail to align identifiers across partners.
- Latency and scalability constraints: The eMIP introduces delays or performance issues when hubs or operators process high volumes of roaming traffic.
- Dependency on roaming hubs or clearing houses: The eMIP relies on external intermediaries that create bottlenecks or single points of failure.
- Regional pricing and taxation variability: The eMIP encounters settlement challenges when partners use different pricing rules, tax structures, or regional formats.
What are the key steps for eMIP implementation?
The key steps for eMIP implementation are listed below.
- System assessment and data mapping: The eMIP requires partners to review internal platforms and map their data fields to standardized schemas.
- Identifier preparation: The eMIP requires correct setup of operator IDs, contract IDs, and routing identifiers that enable consistent communication.
- Authorization workflow configuration: The eMIP requires partners to implement contract validation logic that supports roaming access and session initiation.
- Session data exchange setup: The eMIP requires configuration of real-time and asynchronous message flows for session start, updates, and completion.
- Tariff structure alignment: The eMIP requires partners to format pricing models according to standardized fields used in roaming workflows.
- Settlement and reporting integration: The eMIP requires systems to deliver financial records to clearing houses through validated settlement messages.
- Testing and validation procedures: The eMIP requires functional tests, field validation, and controlled message checks to ensure interoperability.
- Operational documentation: The eMIP requires partners to maintain documentation that explains routing behavior, identifier rules, and support processes.
How does Monta position itself regarding the eMIP and the other roaming protocols?
The way Monta positions itself regarding the eMIP and the other roaming protocols is through a focus on widely adopted and interoperable standards that deliver stable roaming, clear authorization, and reliable settlement. Monta prioritizes protocols such as OCPI because they provide strong adoption, predictable data exchange, and consistent support across partners, platforms, and clearing houses. Monta’s strategic outlook centers on standards that enable broad compatibility, streamlined integrations, and scalable roaming operations.
The position Monta adopts regarding the eMIP and the other roaming protocols highlights platform-level abstraction, unified roaming interfaces, and compatibility layers that maintain interoperability across diverse networks. The evaluation framework used by Monta considers standardization progress, ecosystem readiness, and long-term value for CPOs and eMSPs when assessing new protocols. Guidance offered by Monta reflects a commitment to interoperability, future-proof integration paths, and support for partners seeking roaming standards with strong market relevance.