Renewables

Slovenia’s HESS inks 9.2 MW deal for two solar power plants near HPP Brežice

slovenia hess hpp brezice solar power plant febr-d koncar

HPP Brežice (photo: HESS)

Published

August 13, 2025

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Published:

August 13, 2025

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Hydropower plant operator Hidroelektrarne na Spodnji Savi will build two solar power plants with a combined capacity of 9.2 MW near its Brežice hydropower plant. It picked Končar as the contractor.

Two new photovoltaic facilities in the pipeline are the continuation of investments in solar near the Brežice hydropower plant. Hidroelektrarne na Spodnji Savi (HESS), owned by GEN and HSE, installed a 6 MW PV plant in May 2023 next to the reservoir of its HPP Brežice’s.

At the time, it was the largest in Slovenia, and it remains the largest hybrid system in the country.

The existing PV plant is FEBR-D3, while the two new ones are called FEBR-D1 and FEBR-D2.

“We’re excited to announce a new chapter in our collaboration with HESS,” Croatia-based Končar said.

Končar will install the two solar power plants

Končar, an engineering company, signed a contract in July for the construction of FEBR-D1 and FEBR-D2. It said the endeavor extends the partnership established at HPP Brežice. Of note, it supplied generators for the 47.4 MW HPP, which began operating in 2017.

Located just a few kilometers upstream from HPP Brežice, on the left bank of the Sava River, the two units will have a combined peak capacity of 9.2 MW, powered by 14,790 PV modules, Končar added.

The Croatian firm revealed that the contract is worth EUR 4.5 million. It sets an ambitious goal: both plants are scheduled to be fully operational and handed over to the client by the end of next year, according to Končar.

The largest solar power plant in Slovenia has a capacity of 7.1 MW

In late May, on World Sun Day, HESS announced that it obtained construction permits for the FEBR-D1 and FEBR-D2 solar plants. It is the continuation of the story within which, on June 21, 2023, Slovenia’s largest hybrid solar power plant FEBR-D3 began production, it added.

Of note, the largest solar power plant in Slovenia has a capacity of 7.1 MW. It came online last month on the border with Italy.

Hydropower and solar energy make an excellent combination, so numerous power utilities, including the ones in the Western Balkans, decided to invest. The latest example comes again from Slovenia, where Soške Elektrarne Nova Gorica (SENG), part of HSE, commissioned its first PV unit at its Avče pumped storage hydropower plant.

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