How Plug & Charge Supports Grid Services

Electric vehicles are changing the way we think about energy. Each EV on the road is both a mode of transport and a new load on the grid, with growing potential to serve as a storage asset. 

For utilities, energy managers, and grid operators, this creates both risk and opportunity. The challenge is to manage charging demand in a way that protects grid stability, while the opportunity lies in turning EVs into an integral part of the energy system. 

Plug & Charge is central to this transition. Built on the ISO 15118 standard, it enables secure, automated communication between the vehicle, the charger, and the backend system. For drivers, this means a smooth charging experience. For the energy sector, it creates a platform for smarter charging, load balancing, renewable integration, and eventually vehicle-to-grid services. 

If you want to understand how Plug & Charge works at a technical level, start with our guide to Plug & Charge. This article looks at Plug & Charge in the context of energy management, explaining why it matters for grid stability and how it supports the wider shift to flexible, data-driven energy systems. 

Why Energy Management Matters in EV Charging 

EV adoption is accelerating across Europe. According to the European Environment Agency, nearly 5 million EVs were registered in the EU by 2024, and forecasts expect this number to double within a few years. Every vehicle adds new electricity demand, often at the same times of day. 

Unmanaged charging creates several problems: 

• Local overloads: Residential neighbourhoods and car parks face peak demand when many EVs plug in simultaneously. 
   

• Grid stress: Distribution system operators (DSOs) must invest in costly reinforcements if demand cannot be smoothed. 

• Higher costs: Utilities and energy retailers face spikes in wholesale prices when demand clusters into peaks. 

Energy management in EV charging is the solution. It coordinates when and how vehicles draw power, avoiding overloads and shifting demand to times when energy is cheaper or cleaner. Plug & Charge makes this coordination possible by creating a secure, standardized way for vehicles and infrastructure to exchange data. 

How Plug & Charge Enables Smart Charging 

Smart charging depends on data. Utilities and energy managers need to know who is charging, when charging starts, and how much power is flowing. Plug & Charge provides this foundation. 

When a car connects to a charger, ISO 15118 enables: 

• Authentication: The vehicle identifies itself securely, linking the session to a verified contract. 
   

• Session data exchange: The car and charger share information about charging needs, capacity, and grid signals. 
   

• Automated billing: Transactions are settled in the background, without manual intervention. 

These features allow energy managers to implement smart charging strategies, including: 

• Adjusting charging speeds dynamically based on grid demand. 

• Aligning sessions with off-peak tariff windows. 

• Scheduling charging to maximize use of renewable generation. 

In practice, this means a fleet of company cars can automatically charge more slowly during peak hours, then increase charging when demand drops or renewable output rises. 

How Plug & Charge Supports Load Balancing 

One of the most immediate applications of Plug & Charge in energy management is load balancing. 

At the site level, imagine a supermarket car park with twenty chargers. If all cars start pulling maximum power at once, the site connection may overload. Plug & Charge allows the backend system to distribute power intelligently across all vehicles. Each driver receives enough energy for their needs, while the site avoids exceeding its grid connection limit. 

At the grid level, DSOs can send signals to slow charging in specific neighbourhoods when demand threatens to exceed capacity. Because Plug & Charge sessions are authenticated and standardized, the communication chain is secure and reliable. This helps operators maintain stability without investing in unnecessary infrastructure upgrades. 

Plug & Charge and Vehicle-to-Grid Explained 

While smart charging manages demand, the next frontier is vehicle-to-grid (V2G). ISO 15118 defines the principles for two-way energy flow, allowing EVs to not only consume but also supply electricity. 

For utilities, V2G provides a distributed storage resource. Instead of building new peaker plants, they can draw energy from thousands of connected EVs during peak demand. Later, the cars recharge when demand is low or renewable generation is high. 

For fleets, V2G can offset costs. A logistics company with hundreds of vans parked overnight could provide grid services and earn revenue, while still guaranteeing that the vehicles are ready for use in the morning. Plug & Charge is the trusted communication layer that makes these exchanges happen securely and automatically. 

Plug & Charge for Renewable Energy Integration 

The growth of renewable energy adds another layer of complexity. Solar and wind generation are variable, often failing to align with demand patterns. Without flexibility, excess renewable energy may be curtailed while fossil plants still cover evening peaks. 

Plug & Charge energy management helps close this gap. Because charging sessions are standardized and data-rich, they can be aligned with renewable output. A fleet depot, for example, can charge vehicles during midday solar peaks and reduce charging in the evening. Similarly, cars at workplace chargers can absorb surplus wind generation during the night. 

This makes EVs a flexible load that strengthens the integration of renewables rather than undermining it. 

Plug & Charge Data Transparency Benefits 

Energy managers value predictability. Plug & Charge sessions provide standardized, reliable data that can be integrated into forecasting and planning. 

With session-level information, utilities can: 

• Forecast demand more accurately. 

• Participate in demand response markets with aggregated EV loads. 

• Optimize grid investments by understanding when and where charging demand occurs. 

This transparency also supports regulators and policymakers by providing consistent data on EV charging patterns, helping guide infrastructure development and incentives. 

Operational Efficiency with Plug & Charge for Utilities 

The benefits extend beyond grid stability. Plug & Charge also streamlines operations: 

• Simplified billing: Automatic authentication reduces errors and disputes in settlements between CPOs, EMPs, and utilities. 

  
  

• Interoperability: ISO 15118 guarantees different vehicles and chargers speak the same language, reducing fragmentation. 

  
  

• Scalable infrastructure: As EV adoption grows, Plug & Charge provides a standard that can scale across networks and regions. 

For energy managers, this means fewer resources spent on troubleshooting and more capacity to focus on optimization and innovation. 

Plug & Charge Regulatory Deadlines in the EU 

The EU has set clear requirements through the Alternative Fuels Infrastructure Regulation (AFIR): 

• From January 2026, all newly installed public AC chargers must support ISO 15118-2. 
  
  

• From January 2027, the requirement extends to all new or renovated public and private AC chargers, which must support ISO 15118-20. 

For utilities and grid operators, these deadlines make Plug & Charge a near-term reality that requires immediate planning. Preparing infrastructure and systems now avoids compliance risks and guarantees readiness for the services customers and regulators will expect. 

Steps to Prepare for Plug & Charge as an Energy Manager 

In short, energy managers preparing for Plug & Charge should consider: 

• Infrastructure readiness: Confirm that chargers are ISO 15118-capable or plan for upgrades. 
   

• Backend integration: Make sure platforms can handle certificate management and secure data exchange. 
   

• Data strategy: Define how session data will be captured, stored, and used for forecasting. 
   

• Grid coordination: Engage with DSOs and TSOs to align Plug & Charge with demand response and flexibility markets. 
   

• Security governance: Establish processes for certificate lifecycle management to maintain trust in authentication. 

These steps lay the groundwork for turning EV charging from a challenge into an asset. 

Conclusion 

Plug & Charge delivers convenience for drivers and serves as a cornerstone of energy management and grid services. 

Through ISO 15118, it enables smart charging, dynamic load balancing, renewable integration, and vehicle-to-grid. It gives utilities and energy managers the data and control they need to maintain stability while unlocking new business models. With AFIR deadlines in 2026 and 2027 making ISO 15118 mandatory, the time to act is now. 

At eMabler, we help utilities, operators, and energy managers implement Plug & Charge with minimal disruption. Our API-first platform ensures ISO 15118 compliance, integrates with existing systems, and enables fast deployment at scale. 

👉 If you want to explore how Plug & Charge can strengthen your energy and grid management strategy, get in touch with us!