Electric Vehicle Storage to Grid

Vehicle to grid (V2G) technologies being installed on the UK distribution networks are relatively at their infancy stage with trials being undertaken to understand and demonstrate the impacts and benefits of the technology. Under current requirements and regulations electric vehicles with V2G capability are to be treated as both a demand (when the grid is charging the EV) and a generator (when the EV is discharging into the grid. With regards to connecting to the distribution network, these requirements form the basis for two separate and distinct application requirements: application to connect as a generator, and application to connect as an abnormal load. The basic process and guidance for each application is summarised below.

Generation requirements

The generator application will depend on the power export capacity of the V2G and what generation or storage devices are already connected at the designated charging point. Where the total of all generation, fixed storage and the power export capacity of the V2G is < 50 kW 3-phase or 17 kW single-phase, the G99 simplified application Form A1-1 can be used. Where the total of all generation, fixed storage and the power export capacity of the V2G is > 50 kW 3-phase, the connection application should be made using the G99 Standard Application Form. It is likely that V2G export capacity will be > 16 A/phase and therefore G98 is not applicable and G99 should be used.

If the Vehicle to Grid technology also includes an export limiting device, the applicant must also include the relevant G100 form. 


Note: If your EV charge point is not capable of exporting to the grid, a generation application is not required.

Demand requirements

The installation of the EV charge point must be notified to the local DNO, as per the requirements for connecting an abnormal load. A number of considerations need to be taken into account when notifying the DNO, and a full description of the process, application forms and frequently asked questions can be found on the following page:



ENA are considering how to combine these two processes and make the customer journey for the notification of EV charge point installations simpler and easier. Further announcement will be made through the relevant website and communications channels when these processes are revised.