Plug and Charge EV: How It Works, Benefits and Adoption in India

Public EV charging usually requires a driver to identify themselves before a session begins. Depending on the charging network, that may involve opening an app, scanning a QR code, presenting an RFID card or completing another authentication step.

A well-designed Plug and Charge EV experience aims to remove much of that friction. When a compatible electric vehicle is connected to a compatible charging station, the vehicle and charging infrastructure can exchange the information needed for authentication and authorization automatically.

CharIN describes Plug & Charge as a standardized approach that enables automated communication and billing between the electric vehicle and charging station without requiring external identification such as an RFID card, payment card or charging app.

The underlying technology is closely associated with the ISO 15118 family of vehicle-to-charger communication standards.

For Indian drivers, charging operators and charger manufacturers, the important question is not simply whether Plug and Charge sounds convenient. The real questions are:

• How does authentication work?

• Which vehicles and chargers support it?

• What role do digital certificates play?

• How does it connect with OCPP?

• Is it secure?

• Does India already support the relevant standards?

• How quickly could adoption grow?

Quick Answer: What Is Plug and Charge?

Plug and Charge EV technology enables a compatible vehicle to identify and authenticate itself to compatible charging infrastructure after the charging cable is connected.

Instead of manually authenticating through an app or RFID card, the charging ecosystem can use digital credentials associated with the vehicle and charging contract.

A simplified user journey is:

Connect vehicle → Vehicle and charger communicate → Credentials are validated → Charging is authorized → Session begins

The concept should not be confused with simply starting electricity flow when a cable is connected.

True standardized Plug & Charge involves:

• Vehicle-to-EVSE communication

• Authentication

• Authorization

• Digital certificates

• Contract information

• Supporting backend systems

• Secure trust relationships

ISO 15118 defines the communication architecture that makes this type of interaction possible. ISO confirms that ISO 15118-2 specifies IP-based communication between the electric vehicle communication controller and the charging station communication controller.

Why Plug and Charge Exists

Charging an ICE vehicle at a fuel station is relatively straightforward.

EV charging introduces additional digital steps because a charging network may need to know:

• Who is using the charger?

• Which charging contract applies?

• Which mobility provider should be billed?

• Is the user authorized?

• Which charging session belongs to which account?

Traditional public charging can solve these questions using:

• Apps

• RFID cards

• QR codes

• Web interfaces

• Payment terminals

These methods can work well, but they also introduce friction.

Drivers may face:

• Forgotten passwords

• Weak mobile signal

• App-registration problems

• RFID-card compatibility issues

• Multiple charging-network accounts

• Payment failures

Plug & Charge attempts to move more of the authentication process into the vehicle-to-infrastructure communication layer.

How Plug and Charge Works Step by Step

In a Plug and Charge EV session, several technical systems cooperate behind what appears to the driver as a simple cable connection.

Step 1: The Driver Connects the Vehicle

The charging connector is inserted into a compatible EV.

The vehicle and EVSE begin communication.

For drivers who first want to understand connectors such as CCS2 and Type 2, review EV Charger Types in India: CCS2, Type 2 & Connector Guide.

Step 2: High-Level Communication Begins

ISO 15118 supports digital communication between the vehicle and charging equipment.

This communication can exchange information beyond basic current limits, including information relevant to charging control and authorization.

India has also recognized the ISO 15118 series within its EV standards framework. A Government response listing BIS standards includes IS/ISO 15118 Parts 1, 2, 3, 4, 5 and 8 under communication protocols.

Step 3: The Vehicle Presents Its Digital Identity

The ecosystem can use certificate-based credentials to establish identity and authorization.

Rather than the driver manually identifying themselves, the vehicle can present information associated with its charging contract.

Step 4: Certificates Are Validated

The infrastructure checks whether the relevant credentials can be trusted.

This is where Public Key Infrastructure, or PKI, becomes important.

The ecosystem needs mechanisms for:

• Certificate issuance

• Certificate validation

• Trust chains

• Certificate renewal

• Certificate revocation

• Secure communication

Step 5: The Charging Contract Is Authorized

Once the applicable credentials are validated, the charging session can be associated with the appropriate contract or mobility-service account.

Step 6: Charging Starts

After authorization succeeds, the charger can begin supplying energy according to the vehicle, charger and charging-management requirements.

The driver experiences something much simpler than the technical process occurring in the background.

ISO 15118 Is the Technical Foundation

ISO 15118 is a family of standards covering communication between electric vehicles and EV supply equipment.

ISO 15118-2:2014 specifies network and application protocol requirements between the EV and charging equipment and remains a published standard while a newer edition is under development.

ISO 15118-20:2022 is the second-generation network and application layer standard. It expands the communication framework and includes requirements related to bidirectional power transfer, wireless communication and additional charging-control capabilities.

This distinction is important because Plug & Charge should not be treated as one isolated feature.

The wider standards ecosystem can also support capabilities related to:

• Smart charging

• Energy management

• Bidirectional charging

• Charging schedules

• Vehicle-to-grid communication

Plug and Charge vs Autocharge

These terms are sometimes used as though they mean the same thing, but they should not automatically be treated as equivalent.

Plug & Charge

Typically refers to standardized ISO 15118-based authentication using digital certificates and a structured trust ecosystem.

Autocharge

May refer to other automatic vehicle-identification methods implemented by a charging network.

The practical user experience can look similar:

Plug in → charging starts

But the authentication architecture underneath may be different.

When evaluating a charger or charging network, operators should ask:

• Is this ISO 15118 Plug & Charge?

• What authentication mechanism is being used?

• Is certificate-based authorization supported?

• Which vehicles have been tested?

Major Benefits for EV Drivers

For a Plug and Charge EV user, the biggest advantage is reducing steps between arriving at a charger and starting the charging session.

Less App Dependency

Drivers may not need to open an app every time they charge.

Less RFID Dependency

A compatible setup can reduce dependence on physical charging cards.

Faster Authentication Experience

Automatic vehicle authentication can make the start-of-session workflow more seamless.

Better Charging Experience

The process can become closer to:

arrive → connect → charge

rather than:

arrive → open app → find charger → authenticate → initiate session → troubleshoot

Potential for Better Interoperability

When standards are implemented consistently across vehicles, EVSE and backend systems, the ecosystem can become easier to scale across multiple participants.

CharIN specifically emphasizes standardized and interoperable Plug & Charge implementation.

Why Security Is Central to Plug and Charge

The security model behind a Plug and Charge EV system is important because authentication and billing information can move automatically between multiple digital systems.

These may include:

• Vehicle

• Charging station

• Charging backend

• Certificate infrastructure

• Mobility-service provider

• Charging operator

The ecosystem therefore requires more than simply recognizing a vehicle.

Important security areas include:

• Certificate authenticity

• Encrypted communication

• Certificate expiry

• Revocation

• Private-key protection

• Secure backend access

• Firmware security

• Operational monitoring

OCPP 2.0.1 certification includes an optional ISO 15118 Support profile covering ISO 15118 smart charging and Plug & Charge authorization.

For the broader charging-security layer, review EV Charging Station Security: Cybersecurity Guide for India.

What Role Does OCPP Play?

ISO 15118 and OCPP operate across different communication relationships.

A simplified architecture is:

Vehicle ↔ ISO 15118 ↔ Charger ↔ OCPP ↔ Charging Management System

ISO 15118 primarily addresses communication between:

EV ↔ EVSE

OCPP primarily addresses communication between:

Charging Station ↔ CSMS

Open Charge Alliance confirms that OCPP 2.0.1 includes native support for ISO 15118 Plug & Charge functionality.

This means a Plug & Charge deployment needs more than compatible vehicle-to-charger communication.

Backend systems also need to support the required:

• Authorization workflows

• Certificate handling

• Transaction processing

• Charging-management logic

For a detailed protocol comparison, review OCPP vs OCPI: EV Charging Protocols Explained for India.

Does Every EV Support Plug and Charge?

No.

Compatibility depends on the complete ecosystem.

The vehicle must support the necessary communication and credential functions.

The charging station must support the relevant ISO 15118 functionality.

The backend must be capable of handling the authentication process.

The charging contract and certificate ecosystem must also be configured correctly.

A charger saying:

“ISO 15118 supported”

does not automatically prove that every Plug & Charge workflow is operational with every compatible vehicle.

Operators should verify the exact:

• Charger model

• Firmware

• Vehicle model

• Backend

• ISO 15118 implementation

• Certificate infrastructure

• Tested use cases

Does Every CCS2 Charger Support Plug and Charge?

No.

CCS2 connector compatibility and Plug & Charge capability solve different problems.

CCS2 defines the physical charging interface used by many DC fast-charging vehicles.

Plug & Charge requires an additional communication and authentication capability.

Therefore:

CCS2 compatible ≠ automatically Plug & Charge enabled

Infrastructure buyers should avoid assuming that the connector type alone proves digital interoperability.

The Role of EV Charging Software

Plug & Charge may reduce visible user steps, but it actually increases the importance of dependable backend software.

The network still needs systems capable of:

• Managing charging sessions

• Associating sessions with accounts

• Processing authorization

• Tracking charger status

• Recording energy delivered

• Handling billing

• Monitoring faults

• Maintaining security

For the broader software architecture behind charging networks, review How EV Software in India Is Making Electric Mobility Easier.

What Happens if Authentication Fails?

Automatic authentication should not be treated as the only possible access mechanism unless the charging network has deliberately designed the service that way.

Possible failure scenarios include:

• Expired certificate

• Missing charging contract

• Backend communication failure

• Certificate validation failure

• Vehicle incompatibility

• Charger firmware problem

• Network outage

A public charging operator may therefore need fallback options such as:

• App authentication

• QR access

• RFID

• Other supported payment methods

A seamless feature should not create a single point of failure.

What Plug and Charge Means for Charging Operators

For CPOs, the technology can potentially improve user experience, but implementation adds technical responsibilities.

Operators may need to manage:

• ISO 15118-compatible chargers

• Backend integration

• Certificate lifecycle

• PKI connectivity

• Security monitoring

• Interoperability testing

• Vehicle compatibility

• Contract authorization

A deployment should therefore be treated as an ecosystem integration project rather than merely a charger feature.

Adoption in India

For Plug and Charge EV adoption in India, the standards foundation is more developed than the availability data.

Indian government material confirms recognition of IS/ISO 15118 communication standards. PIB’s August 2025 response on EV standardization lists multiple IS/ISO 15118 parts under communication protocols.

A recent Technology Development Board-supported Indian charger project also reported PLC communication hardware partially compliant with ISO 15118 and an OCPP communication controller compliant with OCPP 2.0.1, showing that relevant communication technologies are being developed domestically.

However, these examples should not be interpreted as evidence that standardized Plug & Charge is already available across India’s entire public charging network.

There is currently no authoritative nationwide public dataset establishing:

• Number of Plug & Charge-enabled stations

• Percentage of compatible Indian EV models

• Number of active certificate-based charging contracts

• Nationwide network coverage

The correct conclusion is therefore:

India has the relevant standards and an increasingly capable charging-technology ecosystem, but nationwide Plug & Charge availability should not be assumed.

Global Adoption Is Moving Forward

International markets provide useful evidence of where the technology is heading.

The European Union’s 2025 delegated regulation identifies Plug & Charge as a technology enabled by ISO 15118-2 and ISO 15118-20 and defines interoperability requirements for future charging infrastructure offering automatic authentication.

This does not create a requirement for India.

It does, however, demonstrate that ISO 15118-based authentication is becoming part of long-term charging-infrastructure planning in major EV markets.

What Indian Charger Buyers Should Verify

Before purchasing equipment marketed as future-ready, ask:

Vehicle Communication

• Which ISO 15118 version is supported?

• Has Plug & Charge been tested?

• Which vehicles have been validated?

OCPP

• Which OCPP version is implemented?

• Does the backend support ISO 15118 workflows?

• Is the required OCPP profile certified?

Certificates

• How are certificates provisioned?

• How are they renewed?

• How are revoked credentials handled?

Backend

• Which CSMS platforms have been tested?

• How are charging contracts mapped?

• What happens during connectivity loss?

Security

• Is encrypted communication supported?

• How are private keys protected?

• How are firmware updates secured?

Fallback

• Can users still start a session if automatic authentication fails?

What Drivers Should Check

Drivers should verify:

• Whether their EV supports the feature

• Whether their charging contract supports it

• Whether the specific charging network supports it

• Whether activation is required

• Whether a backup payment or authentication method is available

For the complete conventional public-charging process, see How to Use Public EV Charging Stations in India.

Plug and Charge and Smart Charging

Automatic authentication and smart charging are different functions, although they can exist within the same technology ecosystem.

Authentication answers:

Who is authorized to charge?

Smart charging answers:

When and at what power should charging occur?

ISO 15118 can support richer communication between the vehicle and charger, including information relevant to charging control.

This becomes particularly important as charging infrastructure develops toward:

• Managed charging

• Renewable integration

• Bidirectional charging

• Vehicle-to-grid services

ISO 15118-20 explicitly addresses bidirectional power transfer communication requirements.

Common Plug and Charge Misconceptions

Myth 1: Every CCS2 Charger Supports It

False. Physical connector compatibility does not automatically mean certificate-based authentication is implemented.

Myth 2: No Backend Is Required

False. The visible user interaction is simpler, but substantial backend infrastructure can exist behind it.

Myth 3: It Eliminates Cybersecurity Risk

False. Certificate-based systems still require secure implementation, lifecycle management and operational monitoring.

Myth 4: Every Compatible Vehicle Works Everywhere

Not automatically. Interoperability depends on the complete vehicle, EVSE, backend and contract ecosystem.

Myth 5: It Is Already Available Across India

There is not enough authoritative nationwide data to support that claim.

How SpeedCharge Fits Into the Connected-Charging Journey

As charging networks mature, user experience will increasingly depend on the combination of:

• Compatible hardware

• Reliable software

• Charging protocols

• Authentication

• Payments

• Network monitoring

• Cybersecurity

SpeedCharge’s technology content covers these layers individually so businesses and drivers can understand how modern connected charging infrastructure operates.

The long-term opportunity is to reduce charging friction without sacrificing security, interoperability or fallback access.

Final Thoughts

A reliable Plug and Charge EV ecosystem can make public charging feel significantly simpler because authentication occurs as part of the vehicle-to-infrastructure interaction rather than requiring a separate manual step every time.

But the user experience depends on a complex system underneath:

compatible EV + ISO 15118-capable EVSE + digital certificates + PKI + backend integration + charging contract + secure operations

India already recognizes important ISO 15118 standards and has domestic charging technology being developed around advanced communication protocols.

The next challenge is not simply adding “Plug & Charge” to charger specification sheets.

It is building tested, interoperable and secure implementations that work reliably across vehicles, charging stations, CPOs and mobility-service providers.