Renalfa Advances Oslomej Solar Project with 50 MW Battery Storage Installation

Austria-based developer and independent power producer Renalfa IPP has commenced the installation of a battery energy storage system (BESS) at its solar power plant in Oslomej, North Macedonia. The system will have an operating power of 50 MW and a storage capacity of 200 MWh, marking a significant step in enhancing grid flexibility and renewable integration.

The co-located BESS is being deployed alongside the 65.8 MW Oslomej solar power plant, which is situated on the site of a former coal mine. The project reflects ongoing efforts to repurpose legacy fossil fuel infrastructure into clean energy assets. The solar facility was developed through a public-private partnership with state-owned utility Elektrani na Severna Makedonija (ESM).

Financing for the solar plant was provided by the Green for Growth Fund, which has also committed €24 million to support the deployment of the battery storage system. The combined investment forms part of a broader initiative to transition North Macedonia’s coal-based energy complex toward sustainable generation.

In 2025, Renalfa secured a €315 million loan facility from a consortium led by the European Bank for Reconstruction and Development. The financing underpins the company’s €1.2 billion regional investment program, which targets the development of approximately 1.6 GW of renewable generation capacity and 3.3 GWh of co-located battery storage across Bulgaria, Hungary, Romania, and North Macedonia.

These assets are expected to produce around 2.3 TWh of green electricity annually—sufficient to meet the energy needs of approximately 920,000 households—while supporting grid stability through integrated storage solutions.

Beyond North Macedonia, Renalfa is also advancing a major hybrid renewable project in Hungary. The company is developing a 450 MW solar power plant in Szihalom, complemented by a BESS with an operating power of 250 MW and a capacity of 1 GWh. The battery system is being supplied by HiTHIUM.

According to Renalfa, the Szihalom project represents the largest hybrid renewable energy development undertaken in Hungary to date and ranks among the most significant such projects in Europe.