Slovenia plans 140 MW floating solar plant (PSE Družmirje)

Slovenia’s state-owned power generation company, Holding Slovenske Elektrarne (HSE), is developing a 140 MW floating solar power plant named PSE Družmirje on Lake Družmirje, a body of water formed by lignite mining near Šoštanj in northern Slovenia.

The Družmirje floating solar power plant (PSE Družmirje) is set to cover up to half of the surface of Lake Družmirje, a lake formed by decades of lignite mining near the town of Šoštanj, northern Slovenia. The project, with an estimated Capex of around €100 million (US$116.6 million), will be funded by HSE’s own funds, loans and support from the European Union’s Just Transition Fund. It will be owned solely by HSE and operated by one of its subsidiary companies, HSE SaŠa.

PSE Družmirje is also Slovenia’s largest solar project under development. The Slovenian market is dominated by residential and C&I-sized solar installations, with the utility-scale market still in its early stages of development. Once operational, it is anticipated that PSE Družmirje will generate up to 140 GWh of electricity annually, comparable to the annual supply for approximately 35,000 Slovenian households. It is likely to become Europe’s largest floating solar project to date, an accolade currently owned by a 74.3 MW array in France that was inaugurated in June 2025.

Construction works are currently planned to begin by Q3 of 2026, ahead of a scheduled production date within Q1 of 2027.