The OCPP Challenge: Connecting Electric Vehicles to the Grid

Electric vehicles (EVs) are quickly becoming a part of everyday life.

As of June 2021, 14.5% of new car sales in the UK were plug-in vehicles, including Battery Electric Vehicles (BEVs) and Plug-in Hybrid Electric Vehicles (PHEVs). By 2035, the UK will ban the sale of petrol and diesel cars, signaling a clear shift toward an EV-dominant future across Europe.

But this EV revolution raises critical questions: How will national grids manage increasing electricity demand? Can Charging Station Management Systems (CSMSes) control all the charge points on their networks effectively? Can Distribution Network Operators (DNOs) anticipate demand to prevent grid overloads?

The Open Charge Point Protocol (OCPP) offers a solution, providing a universal standard for communication between charge points and CSMSes.

As the number of EVs grows, so does the network of charge points. Without a standard, multiple charge points may respond to different CSMSes, leaving some unable to communicate—a “stranded asset.”

OCPP benefits manufacturers by providing open-source software standards. Charge points remain network-compatible even if a CSMS ceases operation, reducing software development costs and obsolescence risk. Manufacturers also don’t need large in-house development teams to maintain connectivity.

CSMSes face similar challenges: ensuring charge points are compatible, avoiding obsolescence, and maintaining operational control.

OCPP standardizes communication between CSMSes and charge points. Using a shared, open-source language compliant with ISO 15118, operators can manage diverse charge points from a single dashboard. OCPP also ensures long-term software compatibility across brands, reducing replacement costs and expanding business opportunities.

DNOs balance electricity supply and demand. More home-installed EV charge points increase grid strain.

OCPP, combined with Open Automated Demand Response (OpenADR), allows EVs to become demand-response assets. CSMSes can send smart charging messages, enabling EV drivers to charge efficiently and reduce electricity use during peak hours. ISO 15118 further guides charge/discharge control, load leveling, and energy optimization.

Vehicle-to-Grid (V2G) technology enhances this by allowing EVs to feed electricity back into the grid or adjust charging rates during high-demand periods.

With more charge points deployed daily, DNOs, CSMSes, and manufacturers need solutions that are interoperable, cost-effective, and energy-efficient. Critical Software’s OCPP stack enables rapid communication between charge points and CSMSes while integrating seamlessly with any OCPP back office, creating an interoperable network quickly and efficiently.