The principal role of Energy Cells, the operator of the electricity storage facilities, is to ensure the provision of the isolated standby power system operation service to Litgrid, the transmission system operator, which creates the conditions for reliable, stable and user-friendly operation of the Lithuanian power system until the completion of the CEN synchronisation project. Energy Cells provides this service at a full planned capacity of 200 MW from October 2023. 

The system of electricity storage facilities managed by the company consists of four battery farms with an equal
capacity of 50 MW and power of 50 MWh each in Vilnius, Šiauliai, Alytus and Utena districts. The operation of the
system consisting of four battery parks is monitored without interruption (24/7) from a control centre in Vilnius. In the event of disruptions in the transmission system network, the energy storage system can automatically, within 1 second, respond to the transmission system operator Litgrid’s need to ensure the security and stability of the electricity system by injecting or withdrawing power into or out of the network, thereby helping to regulate the frequency of the transmission system’s network. Once activated, the instant energy reserve service would continue to be available until the start-up of power generation sources of the other market participants.

UAB Energy Cells, a 100% subsidiary of the EPSO-G Group, was established in January 2021.