Slovenia Opens Tender for Solar-Plus-Storage Project at Former Landfill Site

November 3, 2026 | Slovenia | Solar & Energy Storage

Slovenian state-owned energy company Holding Slovenske Elektrarne (HSE) has launched a tender for a hybrid solar-plus-storage project at a former municipal landfill in central Slovenia, highlighting the potential to repurpose brownfield sites for renewable energy development.

The project, located at Kamnolom Zagorje in the municipality of Zagorje ob Savi, will combine a 1.38 MW solar power plant with a 1.25 MW / 5 MWh battery energy storage system (BESS).

According to the tender details, the selected contractor will be responsible for the design, supply, assembly, testing, and grid connection of the integrated facility. The project forms part of HSE's broader efforts to develop renewable energy assets in brownfield areas across Slovenia's Zasavje region.

Repurposing Brownfield Sites for Clean Energy

The project demonstrates how previously used or environmentally constrained land can be considered for renewable energy deployment, potentially creating new uses for sites that may be unsuitable for conventional development.

HSE has already secured a building permit, with implementation planned for 2027. Part of the project funding is expected to come from the European Union's Just Transition Fund, which supports regions facing economic and industrial transformation.

In addition to renewable energy generation and storage, the project includes measures to improve stormwater drainage and reduce water seepage into the landfill.

Energy Storage Adds Flexibility

The co-located battery system will complement the solar installation by providing a means to store electricity and shift energy delivery. Depending on operating arrangements and market conditions, the system could help improve the utilization of solar generation and provide greater flexibility in managing electricity output.

The tender represents a practical example of how smaller-scale solar-plus-storage projects can contribute to local energy development while making use of existing industrial or brownfield sites.