Romania | Renalfa Starts Construction of Horia 2 Solar Plant as 2 GWh Storage Cluster Advances

October 26, 2026

Renalfa Solarpro Group has started construction of the Horia 2 solar photovoltaic (PV) plant in Arad County, western Romania, marking a key milestone in the development of a large-scale solar-plus-storage cluster planned to integrate renewable generation with multi-hour battery energy storage.

The Horia 2 project has an installed solar capacity of 365 MWp and a planned grid injection capacity of 269 MW. Solarpro Holding is responsible for engineering, procurement and construction (EPC) works. The plant forms part of the broader Horia–Arad energy cluster being developed by Renalfa and French investment manager RGREEN INVEST.

Under the first expansion phase, the wider cluster is planned to reach 568 MWp of solar capacity, supported by a battery energy storage system (BESS) with 669 MW of power capacity and 2,000 MWh of energy storage. A second phase could add a further standalone battery facility rated at 400 MW / 1,608 MWh, potentially alongside additional solar generation.

The development follows Renalfa Power Clusters’ acquisition of the Horia 2 solar project and a separate 400 MW / 800 MWh battery storage project in April 2026. The company plans to integrate and expand these assets into a coordinated hybrid energy complex, with the initial projects expected to support commercial operations from 2027.

Renalfa is also considering a combination of lithium-ion and sodium-ion battery technologies. The planned cluster could incorporate grid-forming inverters and an AI-driven energy management platform to coordinate solar generation, battery charging and discharging, and electricity exports to the grid.

By combining solar generation with large-scale storage, the project aims to improve the flexibility of renewable electricity delivery and support grid balancing. Battery systems can store electricity during periods of high solar output and release it when generation falls or market conditions favour dispatch, subject to system design and operating constraints.

The project reflects Romania’s growing role in Europe’s utility-scale solar and battery storage market. As renewable capacity expands, hybrid developments combining generation, storage and advanced grid controls are becoming an increasingly important option for managing variable power output and improving the integration of clean energy.