The Lošinj system will be housed within the Lošinj 110/35 kV Transformer Station, with a capacity of 13 MVA and 26.5 MWh of energy storage. On Cres, the BESS will be installed at the Orlec Solar Power Plant, with a capacity of 3 MVA and 7.7 MWh of storage.

The Lošinj site was selected to provide reliable backup power in the event of failure on the 110 kV Krk–Lošinj transmission line, which currently feeds both Cres and Lošinj via the Krk 110/35/20 kV Transformer Station. 

On Cres, the installation will optimize solar energy production, improve voltage control, reduce strain on grid infrastructure during peak loads, minimize losses, and potentially enable future autonomous island operations. By incorporating battery energy storage systems into the islands’ power grids, we can effectively narrow the gap between peak and base load demand, strengthening the security of electricity supply. 

Typically, energy grids are designed to handle peak loads, which results in underuse for much of the year. Battery energy storage systems help to reduce peak seasonal demand, optimize existing infrastructure, and decrease the need for new investments. The preliminary design and location permits will need to incorporate the technical solutions required to connect these battery systems to the grid, in accordance with the findings of the Study on Optimal Technical Connection Solutions (EOTRP) and the issued Electric Power Approvals (EES). 

Moreover, later this year on the island of Vis, we plan to install a 1 MW battery energy storage system with a capacity of 1.44 MWh alongside the existing solar power plant.