Energy transition in Southeastern Europe is accelerating, and the progress depends on individual countries’ strategies and legal frameworks. At the Belgrade Energy Forum (BEF 2025), representatives of state-owned power utilities and private producers discussed the different approaches to decarbonization. The domination of investments in renewable energy is unquestionable, but there are also ambitions to develop nuclear capacities, spearheaded by Slovenia. The country is already operating one nuclear reactor and is developing a project for another one.

The electricity sector in Southeast Europe still depends for a large part on thermal power plants that burn fossil fuels. In 2023, they accounted for 43% of overall output, of which two-thirds were from lignite and the rest from gas. There is a need for accelerated decarbonization, and the speed of the transition will depend on financial possibilities and the political will and decisions, said the panel’s moderator and Director of Zagreb-based Energy Institute Hrvoje Požar Dražen Jakšić.

The acceleration trend in decarbonization is also evident in the electricity market projections for the region until 2030. The plans for the period until the end of the decade include shutting down 6.2 GW of thermal power plant capacity and installing 42.3 GW from renewable sources. Greece, Romania, Serbia and Bulgaria are expected to add the most.

Top executives of state-owned utilities in Serbia, Slovenia and Montenegro and independent power producers that invest in renewables in the region gathered at a panel called Decarbonisation strategies for power generation in Southeast Europe 2040/2050 at Belgrade Energy Forum 2025.

They agreed that decarbonization is well underway and an unstoppable process already speeding up significantly. The participants in the discussion presented the different strategies their companies will act upon in the following years and decades, leading the process to fulfilment.

Among the messages that they shared is that they expect each government to promote investments and make the legal framework clear and certain, while the countries strengthen their ties and exchange experiences. Green energy is the pillar of the energy transition and decarbonization in the region, but several states are also interested in building their first nuclear power plants—conventional ones or small modular reactors (SMRs)—or expanding the existing capacity.

EPS’s Živković: Decarbonization requires energy storage, nuclear plants

Chief Executive Officer of Serbia’s Elektroprivreda Srbije (EPS) Dušan Živković pointed out that the state-controlled electricity producer is committed to its goals regarding green energy and emission reductions as well as to the country’s targets. “We will work on that, of course, believing in these objectives, but without compromising energy security and the energy sovereignty of Serbia. It was proven to be the only sustainable path,” he asserted.

The company particularly counts on the project for solar power plants with a total connection capacity of 1 GW, with batteries of 200 MW in combined capability. The investment is conducted through a strategic partnership with Hyundai Engineering and UGT Renewables (UGTR).

A study is underway in Serbia on the potential for the construction of large nuclear power plants and small modular reactors

The decarbonization process won’t be easily feasible without serious energy storage capacity, Živković warned and added that nuclear energy wouldn’t be unrealistic. A study is underway on the possibilities of building large nuclear plants and small modular reactors in Serbia.

The head of EPS expressed the belief that “the quality of that energy needs to be visualized” for citizens of every country and that they should be explained that it is necessary to provide energy for the economy and its security.

No dilemma in Serbia about energy transition

Country Manager of WV-International in Serbia Neda Lazendić highlighted the said strategic partnership for solar power plants with battery energy storage systems (BESS), saying Hyundai Engineering is a world-renowned company.

In her view, the endeavor will be a milestone for the entire region and it is exceptionally important for gaining experience at the domestic level.

The recent second round of auctions for electricity from renewable sources showed that Serbia opted for the energy transition “and there is not any dilemma about it anymore,” Lazendić stressed and said the country is an example for the region. The prices from the bidding that were accepted are appealing and they match European trends, she noted.

Lignite is highly unprofitable

Slovenia and GEN energija, one of the state-owned power utilities, are relying on both renewable sources and nuclear energy in their decarbonization investments, the company’s CEO Dejan Paravan pointed out.

“We want to get rid of coal as soon as possible. And in the short term, renewables are the only option. Why get rid of coal? The current production of domestic lignite is highly unprofitable, and because of climate goals,” he explained.

Nevertheless, it is exceptionally complicated to get permits for renewables and place them in the environment, Paravan added. On the other hand, nuclear energy is emissions-free and very stable and reliable, he asserted. The technology takes up the least space and enables the production of huge amounts of electricity, the head of GEN energija said.

Nuclear power plant Krško 2 could come online in 2040

Paravan recalled that two years ago nuclear power plant Krško marked four decades since it was commissioned and that its operating life was extended by 20 years. GEN energija is working on the Krško 2 project. The chief executive expects construction to begin in 2022 or 2023 and that the reactor could be connected to the grid in 2040.

In parallel, the company is studying SMRs. Still, the development of the technology will take a long time and, importantly, such facilities won’t have the advantage of scale like large reactors, he said. One who expects electricity from SMRs to be cheaper than from big nuclear plants is wrong, in Paravan’s view.

As for the dilemma between renewable sources and nuclear energy, he expressed the belief that they are not mutually exclusive. “We need renewables and they can provide us a lot of CO2-free electricity in the short run. But let’s make it clear that once we come to 70%, 80%, 90% based on renewables, that we have a problem of seasonal storage, that things will get very difficult,” Paravan stated.

Batteries are ten times cheaper than ten years ago

Conversely, Akuo Energy’s CEO Eric Scotto pointed out that nuclear power is expensive. “It’s over. We won the race. Renewable is the cheapest way to produce energy,” he underscored.

The price of energy storage capacity is ten times lower than ten years ago, the head of the French company noted. Moreover, operating power of a battery system in a standard TEU container, twenty feet or 6.1 meters long, now reaches 6 MW, which is three times more than three years ago, according to Scotto.

To attract investments, stability is necessary, he stressed. Scotto went on to highlight some “simple things” that could help Akuo, which was one of the winners at the last auction round in Serbia, to materialize its projects for two wind parks. He mentioned the speed of permitting for telecommunication systems and road construction, for power plants.

Turning to the slowness of the energy transition in Balkan countries, he emphasized its positive side. “We are late. Then we will benefit from the cheapest resource, the cheapest way to produce energy,” Scotto concluded.

EPCG’s Solari project kicked off energy transition in Montenegro

Technical Director of Elektroprivreda Crne Gore (EPCG) Ljubiša Đurković called the state-owned power utility’s projects Solari 3000+ and Solari 500+ the start of the energy transition in Montenegro. Since the beginning of 2023 and including Solari 5000+, launched later, the company set up photovoltaic systems on 7,380 structures, he revealed.

Total peak capacity reached 76 MW and another 125 MW will be installed by the end of the year, EPCG’s official said.

Among its projects, the company is building the Gvozd wind farm, and the Kapino polje solar park near Nikšić.

There is already 10 MW on roofs in the former Željezara steel plant in Nikšić, and before the end of the year another 15.5 MW will be connected to the grid, Đurković said. A contract has been signed for the construction of the eighth generator in the Perućica hydropower plant, of 58 MW. It is scheduled for completion in 2027.

Đurković: A realistic date for the closure of the Pljevlja thermal power plant is between 2045 and 2050

The energy transition is about a single and connected system, including storage capacities and measures to improve energy efficiency, he underscored. “You have to create the conditions for a swift integration of renewable energy sources into the distribution and transmission networks. We were supposed to do that already. We didn’t do it, particularly in the Western Balkans. We didn’t reconstruct the distribution and transmission networks,” he stated.

As for the current reconstruction of the coal-fired Pljevlja thermal power plant, the only one in Montenegro, Đurković said the project wouldn’t make sense if the facility were to keep operating only for a short while longer.

žAccording to the National Energy and Climate Plan (NECP), which is almost complete, it will remain active at least until 2041, although the realistic date for its closure is only between 2045 and 2050, in the opinion of EPCG’s technical director. The main phase of the reconstruction began at the end of March.