June 27, 2025
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Solar power exceeds Bulgaria’s entire electricity demand for first time

For the first time, photovoltaic production alone surpassed power consumption in Bulgaria – for two hours. Interestingly, even more electricity was exported at the same time.

On Friday, June 20, the active photovoltaic capacity in Bulgaria between 10:00 and 11:00 before noon was 2,935 MW, and in the following hour it grew to 3,230 MW, state news agency BTA reported. According to data from the Electricity System Operator (ESO) and the European Network of Transmission System Operators for Electricity (ENTSO-E), it exceeded the country’s entire consumption for the first time ever, by 17 MW and 313 MW, respectively.

Even more electricity was exported at the same time, as total domestic production amounted to 6,567 MW and 6,736 MW.

Of note, not all solar power went to Bulgarian consumers, given that some traders and customers have long-term contracts with other suppliers, like the National Electricity Co. (NEK) and nuclear power plant Kozloduy, the article adds.

“This is a significant event and a great success for Bulgaria and the Bulgarian energy sector. Positioning us this way – as a leading country in the production of photovoltaic energy – not only supports the implementation and fulfillment of the commitments that Bulgaria has made for decarbonization, but it also has a positive effect on the country’s investment climate. Thanks to the solar energy that we transform into electricity, we are modernizing the entire Bulgarian energy sector,” Chairwoman of the Bulgarian Photovoltaic Association Meglena Rusenova commented.

Photovoltaics are perhaps the fastest-growing private investment sector in Bulgaria, she said.

Photovoltaics are biggest factor lowering prices at the electricity exchange

Over the past two years, over EUR 2 billion have been invested in electricity production, according to Rusenova. On top of that there are capital investments in energy storage and infrastructure, she pointed out.

Solar energy contributes to reducing prices for end users, and in practice, photovoltaics are the most significant factor for lower prices on the Independent Bulgarian Energy Exchange (IBEX), Rusenova underscored.

According to ESO, a total of 3.5 GW of photovoltaic capacity has been connected in the last three years, bringing the total to 4.7 GW.

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June 24, 2025
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North Macedonia, Kosovo* planning 400 kV power interconnection

The transmission system operators (TSOs) of North Macedonia and Kosovo* are developing a project for a 400 kV interconnection line between Tetovo and Prizren. The investment would include other grid upgrades and expansion.

Director-General of North Macedonia’s MEPSO Burim Latifi and Acting Chief Executive Officer of Transmission, System and Market Operator (KOSTT) of Kosovo* Shaban Neziri signed a memorandum of cooperation in Skopje. The two transmission system operators intend to jointly upgrade the high-voltage network. The emphasis is on a strategic project for a 400 kV interconnection line from Tetovo to Prizren.

The endeavor aligns with the European Union’s energy transition goals by 2050, North Macedonia’s TSO said. The project is nominated through the planning platform of the European Network of Transmission System Operators for Electricity (ENTSO-E) for increasing transmission capacities.

New interconnection to encourage investments in renewables

North Macedonia and Kosovo* have only one interconnection now, of 220 kV. According to ENTSO-E, Southeastern Europe needs to at least double transmission capacities and, in some cases, increase them even more than that, MEPSO stressed.

On that note, the bilateral project includes additional investments in the transmission network, such as the construction of a 400/110 kV transformer station in Tetovo, in North Macedonia’s northwest, and 400 kV transmission lines from Tetovo to Ohrid and Skopje.

“The 400 kV Tetovo-Prizren transmission line project will not only increase the system’s capacity and reliability but also enable greater electricity exchange, encouraging new investments in renewable energy sources,” Latifi said.

Investment to bolster East-West energy corridor

Regarding the other benefits, the heads of the two TSOs agreed that the project would bolster the transmission infrastructure in the region, strengthen the so-called East-West energy corridor and improve system flexibility.

The new document confirms the joint commitment to creating a modern and reliable energy infrastructure, Neziri stressed. “With this project, we are enhancing energy connectivity in the region and contributing to achieving the energy goals of the Western Balkans,” he added.

Strong interconnections are essential for the integration of the electricity market in the Western Balkans

The project is in the planning and technical preparation phase. The start of construction depends on securing financial resources and coordination with all relevant stakeholders, MEPSO explained.

Strong interconnections are essential for the integration of the electricity systems and markets in the region with the EU, through market coupling. Together with Albania and Greece, North Macedonia and Kosovo* are part of one such regional project, which has been suffering delays.

Market coupling is a prerequisite for the exemption of the power markets in the Western Balkans and the rest of the Energy Community from the EU’s Carbon Border Adjustment Mechanism, or CBAM, under which a CO2 tax is set to start being charged on January 1.

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* This designation is without prejudice to positions onstatus and is in line with UNSCR 1244/99 and the ICJ Opinion on the Kosovo declaration of independence.
June 3, 2025
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Third Regional Power Sector Exchange in Ohrid: Power grids at core of energy transition

The third Regional Power Sector Exchange of the Western Balkans in Ohrid in North Macedonia gathered over 80 energy professionals from the region to discuss the future of electricity decarbonization and the urgent need to modernize power infrastructure.

Organised under the framework of the Regional Climate Partnership between Germany and the Western Balkans, the conference brought together representatives of transmission and distribution system operators, energy regulators, and energy ministries to accelerate coordinated action toward a greener, more resilient power system.

“No grids, no glory. This slogan captures the challenge in front of us. Without investment in power grids, adaptable regulation, and skilled professionals, the renewable energy transition cannot succeed,” Project Manager at GIZ Nicolas Heger said in his welcoming remarks.

Oberhuber: The Western Balkans have the potential to become a major exporter of clean electricity

Opening addresses were delivered by David Oberhuber, GIZ Country Director in North Macedonia, Anca-Iulia Cimpeanu, European Commission (DG ENER), and Davor Bajs, Energy Community Secretariat.

In his keynote speech, Oberhuber stressed the region’s strategic importance in the Regional Climate Partnership.

The Western Balkans has the potential to become a major exporter of clean electricity to Western Europe and a hub for investment and innovation in renewable energy, he said.

North Macedonia is advancing its energy transition by expanding renewables – solar power capacity reached 506 MW in 2023 – and reducing coal dependency, although thermal power plants still accounted for 47.3% of total electricity production in early 2024.

In 2023, renewables made up 33.15% of electricity generation, with households, transport, and industry as the top energy consumers.

To accelerate the shift, tailored support projects were launched. The Energy, Water Services and Municipal Waste Management Services Regulatory Commission is tackling the surge in renewables applications. Distribution system operator (DSO) EVN is focusing on smart grids and energy quality, and transmission system operator (TSO) MEPSO is exploring options to reduce balancing costs through regional market mechanisms.

Six tailored support projects presented

The event included three sessions on tailored support projects.

Professor Nermin Suljanović presented the project Concept on Data Exchange Between System Operators in Bosnia and Herzegovina.

The data platform enables automatic data exchange among all actors in the electricity market in Bosnia and Herzegovina, ensuring data interoperability and harmonized communication interfaces, according to Suljanović.

He also outlined the project Technical Specification and Requirements for Integration of Renewables into DSO Telecommunication Network.

E-mobility is not only related to energy but also to transportation, telecommunication, data security

A project titled Procedure for Handling RES Connection Requests to the Grid – Queue Management was presented by expert Miltos Aslanoglou, and the Roadmap for Creating a Legal and Regulatory Framework for EV Charging by expert Dejan Stojadinović.

“EU legislation on this matter is a good base for the Western Balkan countries to prepare relevant legal and regulatory frameworks. E-mobility is not only related to energy but also to transportation, telecommunication, data security, and other issues,” Stojadinović said.

Goran Majstrović, Deputy Director and Head of the Energy Transmission and Distribution Department at Energy Institute Hrvoje Požar (EIHP), gave an insight into the project Feasibility Analysis and Funding Assessment for using Dynamic Line Rating (DLR) on the Kosovo* Transmission Grid.

Simplification of Procedures for Prosumer Connection to the Distribution Network in the Federation of BiH was the name of the project introduced by expert Goran Dobrić.

The need for regionally integrated networks has never been greater

Blackouts in both Southern and Southeastern Europe have highlighted vulnerabilities in grid infrastructure amidst growing shares of renewable energy. The need for modern, flexible, and regionally integrated networks has never been greater.

The event was part of a wider regional project implemented by GIZ on behalf of the German government, supporting the integration of renewables and enhancing energy security across the WB6.

In just two years, the project has supported over 30 institutions, trained more than 135 energy professionals, and facilitated the development of the Action Plan for Power Grids in the Western Balkans, in cooperation with the Energy Community Secretariat.

Network redesigns are lagging behind renewables by seven to ten years

Goran Majstrović from Energy Institute Hrvoje Požar presented the Action Plan for Power Grids in the Western Balkans.

“The path to integration of renewables is not just replacing power plants but redesigning the entire system to accommodate them. Network redesigns are lagging behind renewables by seven to ten years,” he asserted.

In the plan, the required grid investments by 2030 in the six countries of the Western Balkans (WB6) are estimated at EUR 10 billion to EUR 14 billion. Investments in primary equipment are seen at EUR 6 billion to EUR 8 billion. As for secondary equipment (digitalization), the forecasted tally is EUR 4 billion to EUR 6 billion.

Phase 2 of the project Green Agenda: Decarbonisation of the Electricity Sector in the Western Balkans is scheduled for completion in 2028. The Regional Power Sector Exchange will remain a key platform for cooperation, helping ensure the energy transition in the region is just and inclusive.

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* This designation is without prejudice to positions onstatus and is in line with UNSCR 1244/99 and the ICJ Opinion on the Kosovo declaration of independence.
May 30, 2025
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Western Balkans power markets: hope for coupling with EU, concerns about CBAM

Energy Community contracting parties are doing their best to meet the challenging requirements and use the opportunity to couple their electricity markets with the European Union in Q4 2026 or Q1 2027. Apart from other benefits, coupling could represent a strong incentive for investment in renewables. However, the introduction of CBAM could be a step back for electricity markets, investments and energy transition in the region, according to representatives of transmission system operators, regulators, and power exchanges who spoke at Belgrade Energy Forum 2025.

The third Belgrade Energy Forum, BEF 2025, organized by Balkan Green Energy News, welcomed four hundred participants from more than 30 countries from the region, Europe, and beyond.

Participants in the panel called Integration of Western Balkans electricity markets into internal European market through market coupling were:

  • Anže Predovnik, ADEX Group, CEO,
  • Jasmina Trhulj, Energy Community Secretariat, Head of Electricity Unit,
  • Ivan Asanović, TSO Crnogorski Elektroprenosni Sistem (CGES), CEO,
  • Marko Bislimoski, Energy, Water Services and Municipal Waste Management Services Regulatory Commission of the Republic of North Macedonia (RKE or ERC), President,
  • Zoran Vujasinović, EU Agency for the Cooperation of Energy Regulators (ACER), Policy Officer.

They discussed very hot topics including market coupling, the Carbon Border Adjustment Mechanism (CBAM), and blackouts.

Market coupling: The first go-live window scheduled for Q4 2026 or Q1 2027

Dejan Stojčevski and Jasmina Trhulj (photo: Balkan Green Energy News)

In his opening remarks, panel moderator Dejan Stojčevski, CTO of the SEEPEX power exchange, emphasized the importance of integrating the electricity markets of the Energy Community contracting parties (EnC CPs) with the EU internal electricity market as a key element in the energy transition process.

“Market coupling, which is a prerequisite for a successful energy transition, brings about greater transparency, increased competition, the establishment of a unified regional reference price, and stronger incentives for investment in renewable energy sources,” he stressed.

However, in his words, the integration is not without challenges. Countries in the region must address several issues, including the transposition of relevant regulations, the designation of nominated electricity market operators (NEMOs), and the operational connection process through the implementation of local projects, Stojčevski underlined.

Trhulj: The transposition of EIP enables accelerated electricity market integration into the single EU electricity market

The most important regulation is the Energy Integration Package (EIP). Jasmina Trhulj, Head of Electricity Unit of the Energy Community Secretariat, recalled that the transposition of EIP by the contracting parties enables their accelerated electricity market integration into the single EU electricity market before accession into the EU takes place.

To achieve that, EnC CPs have to adopt and implement the laws in a compliant manner, including extending ACER’s jurisdiction to the cross-border issues between EU member states and EnC CPs, she noted.

With regard to regional methodologies, ACER is competent to the extent that neighboring EU countries are involved, which is most often the case.

The preparation of the Market Coupling Operator Integration Plan is underway

Another important piece of the puzzle is the Market Coupling Operator Integration Plan (MCO IP), which will set guidelines and timelines for the implementation of the day-ahead and intraday market coupling of EnC CPs. Trhulj confirmed that the preparation is currently underway.

According to the draft MCO IP, the first go-live window is scheduled for Q4 2026 or potentially by Q1 2027, provided that the following prerequisites are met, she revealed.

The prerequisites are the transposition of the EIHP completed and its compliance verified; NEMO designated in a compliant manner; operational readiness of transmission system operators (TSOs) and NEMOs confirmed; and full contractual adherence completed.

“Provided that the legislation is transposed and its compliance verified and MCO IP approved by ACER, a NEMO may submit requests for accession to market coupling. This is followed by an accession process lasting up to 18 months,” Trhulj explained.

Serbia, Montenegro “locked and ready” for the first go-live window

Anže Predovnik and Zoran Vujasinović (photo: Balkan Green Energy News)

ADEX Group CEO Anže Predovnik shared Slovenia’s experience in various market coupling processes within the internal European electricity market, including different products such as day-ahead, intraday continuous, and intraday auction market coupling.

He particularly emphasized the importance of market coupling and its impact on liquidity, transparency, competition, and increased investments in renewable energy sources.

Predovnik presented HUPX’s integration into the ADEX Group, which was completed in late 2024, and highlighted the benefits ADEX brings to the market and its participants through the unification of the power exchanges of Slovenia, Serbia, and Hungary.

Enhanced transparency, the use of a unified trading and clearing technology, a single market operation, a harmonized market access process across the ADEX markets, alignment of rules, and improved client services are just some of the advantages offered by the formation of ADEX Group, he pointed out.

One immediate benefit already implemented is that market participants active in one ADEX market do not pay entry fees when accessing another market within the group.

Predovnik: Market participants active in one ADEX market don’t pay entry fees when accessing another market within the group

“Additionally, all resources within the group are contributing to the implementation of the local project for coupling the Serbian and Hungarian day-ahead markets, with the project expected to be completed at the first available slot, anticipated for Q4 2026 or Q1 2027,” Predovnik noted.

CEO of Montenegro’s TSO Crnogorski Elektroprenosni Sistem (CGES) Ivan Asanović also spoke about the market coupling project timeframe.

After compliance of the transposition of EIP is verified and provided that the necessary adaptations of the Day-ahead Operations Agreement (DAOA) and the Intraday Operations Agreement (IDOA) regarding the extension to the price zones of EnC CPs are adopted at the Market Coupling Steering Committee (MCSC) level, CGES and power exchange BELEN could sign these contracts, becoming non-operating parties in the MCSC, he revealed.

According to Asanović, obtaining the status in MCSC is a precondition for the submission of a request for change, and it is extremely important to carry it out in a timely manner, to complete the process, which lasts 18 months, until Q4 2026 or Q1 2027.

Of note, a week ago, North Macedonia’s Minister of Energy, Mining and Mineral Resources Sanja Božinovska said it is realistic to aim for coupling in the fourth quarter of 2026 or the first quarter of 2027.

CBAM and blackouts are looming

Anže Predovnik, Zoran Vujasinović and Ivan Asanović (photo: Balkan Green Energy News)

Apart from market coupling, the stakeholders in the region are also concerned about the developments regarding the Carbon Border Adjustment Mechanism (CBAM) as well as about blackouts.

Dejan Stojčevski (SEEPEX) sees the potential effect of CBAM on the electricity sector, starting on January 1, 2026, as a major issue.

The mechanism could pose a serious threat to the overall energy transition in the region, he added.

In addition, it is crucial to discuss system security and the root causes of the blackouts that recently occurred across Europe, Stojčevski pointed out.

“As there was no announcement that the application of CBAM will be postponed, we are operating under the assumption that it will apply to electricity as of January 1, 2026, given that the contracting parties will not be ready for market coupling by that date,” Jasmina Trhulj (Energy Community Secretariat) underlined.

Trhulj: There is a risk that certain stakeholders may shift their trading activities and renewable investments away from the region

In her words, it creates a number of risks to the functioning of the regional electricity market and the energy transition process that the secretariat has been raising on behalf of the contracting parties, electricity traders, power utilities, renewable energy developers, and other stakeholders.

She warned of a risk that certain stakeholders shift their trading activities and investments in renewables away from the region, thereby potentially undermining integration and decarbonization efforts.

Dejan Stojčevski, Jasmina Trhulj and Marko Bislimoski (photo: Balkan Green Energy News)

In addition, market participants are raising the issue of the considerable uncertainty regarding the exact technical implementation of CBAM for electricity – inherently unique within a group of goods, Trhulj recalled.

It is crucial for the countries in the region to speak openly with Brussels, said Marko Bislimoski, president of the Energy, Water Services and Municipal Waste Management Services Regulatory Commission of the Republic of North Macedonia. In addition, they need to come up with an action plan, together with the Energy Community Secretariat, defining the phases for the introduction of carbon pricing, in his view.

Bislimoski: We need to define the items for which we need financial assistance from the EU

“We need a serious approach and to say what we can do ourselves, and then immediately make it happen. At the same time, we need to define the items for which we will need financial assistance from the EU,” Bislimoski asserted.

The panelists agreed the region needs to present a single coordinated position on CBAM at an upcoming meeting on July 1 in Brussels.

Bislimoski recalled that North Macedonia recently adopted the new Law on Energy and added that bylaws would follow. The end goal is to provide security and stability in the transmission and distribution of electricity like in the EU, but also to lower the prices of electricity for consumers, he added.

Asanović: It is necessary to take urgent measures to improve coordination in the region

Regarding the issue of blackouts, Ivan Asanović (CGES) emphasized the importance of coordinating transmission capacities and maintenance plans for transmission lines across the wider Balkan region.

He recalled the challenging operational conditions experienced last winter, when exchanges planned along the Greece-Bulgaria-Romania-Hungary corridor were largely physically realized via the southwestern Balkans, leading to significant network stress. Such situations must be avoided through more comprehensive coordination, he warned.

It is necessary, in his words, to take urgent measures to improve coordination in the region to alleviate the current problems until the establishment of the mechanisms and structures prescribed in the CACM and SOGL regulations.

“These rules will fully harmonize the operation of the system in the region with the rest of Europe and significantly improve the security of functioning and create the necessary preconditions for connecting the markets of the WB6 countries with the single European market,” Asanović stressed.

Vujasinović (ACER): Full operational readiness of CCRs is not a prerequisite for market coupling

Zoran Vujasinović and Ivan Asanović

TSOs made a breakthrough in December. They agreed on a Joint Declaration on Regional Coordination. The declaration, facilitated by ENTSO-E, outlined a new comprehensive cooperation framework for the Western Balkans TSOs within South-East Europe.

Zoran Vujasinović, Policy Officer at the EU Agency for the Cooperation of Energy Regulators (ACER), mentioned that in January the body submitted a request to the TSOs to propose the configuration of capacity calculation regions (CCRs), incorporating the bidding zone borders of EnC CPs within the framework of the EU CCR methodology.

The TSOs’ proposal is expected by the end of July, after which ACER will issue a decision within six months, he said.

The current TSO proposal envisions:

  • the inclusion of the southeastern bidding zone borders in the Balkans into the South East Europe (SEE) region, which already includes the borders between Romania, Bulgaria, and Greece.
  • the formation of a separate region in the northwestern part (covering the mutual borders of bidding zones of Serbia, Bosnia and Herzegovina, and Montenegro, as well as their bidding zone borders with the EU), with a perspective of integration into the Central Europe region.
  • the Italy-Montenegro region and the Eastern Europe region (including Ukraine, Moldova, Poland, Slovakia, Hungary, and Romania) to remain unchanged, as defined by the CACM Regulation of the Energy Community.

According to Vujasaninović, ACER’s position is that the entire region should, over time, transition to flow-based capacity calculation and allocation methodologies. However, the initial step will be participation in market coupling based on Net Transfer Capacity (NTC) values.

“It is important to note that full operational readiness of CCRs is not a prerequisite for market coupling. The coupling can proceed based on existing NTC calculation procedures, provided that regional operational security is not compromised at any time and that maximum coordination in capacity calculation is ensured,” Vujasinović stressed.

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May 28, 2025
by in News

BEF 2025: Digitalization, open markets, time are major preconditions for flexibility services mainstreaming

Digitalization and massive use of data are crucial for providing flexibility services that bring benefits for transmission system operators and renewable energy producers. Aggregators and software firms have developed the technological solutions. However, the process, together with the introduction of flexibility platforms, requires a long time. The reforms also have to be accompanied by market liberalization and end consumers acting as active buyers, according to the participants of Belgrade Energy Forum 2025.

The panel on flexibility services called Market Flexibility: The Backbone of a Resilient Energy System was one of eight that were held at Belgrade Energy Forum 2025 (BEF 2025).

The conference, organized by Balkan Green Energy News, welcomed four hundred participants from more than 30 countries from the region, Europe, and beyond.

“Flexibility has been promoted in Europe as a buzzword, sometimes reflected as demand-side flexibility, but it represents so much more. It includes supply-side flexible assets like hydro, biomass, storage, as well as grid-side flexibility,” according to panel moderator Elena Boškov Kovacs, co-founder and CEO of Blueprint Energy Solutions, and a leading voice on market flexibility in Europe.

Serbia will introduce a flexibility services market

Elena Boškov Kovač and Roman Bernard (photo: Balkan Green Energy News)

Serbia’s transmission system operator (TSO) Elektromreža Srbije (EMS) is preparing to liberalize the ancillary services market. The country adopted the Law on Energy in November and implemented a large proportion of the European Union’s Electricity Integration Package (EIP) while the remaining parts will be transposed through bylaws.

“The balancing capacity market will be liberalized from next year. We will have new participants – active buyers and independent aggregators,” said Marko Zarić, Head of the Market Operations sector of EMS.

He stressed that the TSO is trying to ensure that no market participant is impaired by engaging flexibility resources or demand side response or a balancing service.

“EMS has finished drafting the new market code, which envisages dual balancing responsibility. We will launch a public debate on the act. The TSO estimates that it is the best solution to open the market of flexibility services,” he noted.

Bernard: Technology is on our side

NGEN CEO Roman Bernard expressed the opinion that the region is moving in the right direction, and suggested to regulators to look around and implement best practices. If the participants in the market are motivated, things will go forward, he added.

Back in 2019-2020, when NGEN started its operations in Slovenia, flexibility services were a pioneering job. The Slovenian energy company, the technology sponsor of the BEF 2025 conference, specializes in premium battery energy storage systems (BESS) and smart energy solutions.

According to Bernard, the balancing services market in the EU is well developed thanks to balancing platforms MARI (Manually Activated Reserves Initiative) and PICASSO (Platform for the International Coordination of Automated Frequency Restoration and Stable System Operation).

“We have 150 employees, and we can do everything. Technology is on our side and the sky’s the limit,” he stressed.

For example, NGEN solutions can provide monetization of battery energy storage systems (BESS), and the only thing that is needed is investors in such facilities.

Digitalization is the only way forward

Roman Bernard, Luka Renko and Magdolna Tokai (photo: Balkan Green Energy News)

The representatives of aggregators KOER and Alteo and software company CyberGrid all agreed that digitalization and the use of data are crucial for the energy transition.

Compared to NGEN and its use of BESS, Croatia-based KOER, a pioneer in virtual power plants in the region, is utilizing existing assets, like diesel generators, or employing the flexibility intrinsic to most manufacturing companies; for example, cement factories and wood manufacturers.

Existing assets work well, not just batteries, KOER COO Luka Renko stressed.

The only problem, in his words, is digitalization. The majority of the said firms aren’t ready to connect to the platform to be automatically switched on and off. The markets are getting faster and faster, so digitalization is the only way forward, Renko claimed.

Alteo, a leading Hungarian aggregator, also believes in lots and lots of data, which back up its scheduling and contribute to the security of supply.

Tokai: Alteo is looking for partners in the region

“Our superpower is providing scheduling services with the support of AI, including lots of data,” said Magdolna Tokai, Deputy CEO for International Relations and Corporate Services of Alteo.

Hungary has experienced a photovoltaic boom in the past four or five years, with the installation of almost 8,000 MW. It’s good for greening power production, but not from the perspective of a TSO, and that is where aggregators come into the picture, she added.

Alteo is combining conventional resources like gas-fired power plants with renewables. It currently has 140 MW in renewable resources, it manages 2,000 MW of third-party solar, and operates two virtual power plants. The company is providing the service to small photovoltaic facilities and the TSO.

Alteo is integrating solar energy in a product that is close to baseload, and placing it on the market. It translates to lower balancing costs for solar and a more stable product for the TSO, she explained.

Serbia is facing a challenge from the upcoming 1.2 GW of solar power

Alteo has just started implementing its new strategy for regional growth by exporting know-how on balancing services and providing flexibility to market players.

According to Nikolaj Candellari, Project Manager and Market Intelligence of CyberGrid, real-time data gives a TSO and other market participants the possibility to understand where they are.

He recalled that, over the years, the market went from 15-minute time stamps, down to one minute, and that now it is only two seconds. The improvement helps dealing with challenges, and CyberGrid knows a lot about such issues.

“For Serbia, the challenge comes with 1.2 GW of solar, which will be installed next year. So if you don’t see it as a challenge, ask yourself who needs 1.2 GW of energy at noon on Sunday,” Nikolaj said.

Over its 15 years of existence, CyberGrid developed good examples of how to exchange data with assets and TSOs.

“Assets are always the same, no matter the country, but to have this data exchange with TSOs, or even market platforms, that is something I think we need to do in the future in Southeastern Europe,” he stressed.

How to get to the future: properly liberalize markets

Luka Renko, Magdolna Tokai and Nikolaj Candellari (photo: Balkan Green Energy News)

Elena Boškov Kovač (Blueprint Energy Solutions) asked the panel participants what the solution is for addressing different types of flexibility assets including prosumers.

“How do we avoid getting stuck in the easy-to-commercialize part of the aggregation, and postpone the true demand response, which is needed to avoid the issues with negative pricing and electricity market swings?” she asked.

There is no dilemma for Nikolaj Candellari (CyberGrid): “I think we can connect everything, including households.”

It is something futuristic, he said. “We have to try to go as low as possible and connect everybody because, in the end, it’s not different if you have a 1 MW battery or 100 smaller residential ones” of 1 MW combined, Candellari asserted.

His company is currently implementing a project to integrate 150 batteries of 2 MW overall and put them on the market.

The batteries can drive the prices for end users down by 25% within five years

Candellari and Roman Bernard (NGEN) alike highlighted the factor of market motivation.

Bernard said motivation is created by the market. The imbalance price can go up to EUR 15,000 per MWh, and it is the signal and the motivation to fix everything, in his opinion.

He is convinced that batteries can lower the prices for end users by 25% within five years if dynamic prices are applied.

According to Nikolaj Candellari, participants will come to the market, as long as it’s not too regulated. As an example of a non-functional market, he mentioned Bulgaria, where the capacity price for downward regulation is zero.

“So, why would anybody join the market, if the capacity price is zero? Get the market running and you will get participants and capacity needed to balance it,” he said.

Tokai: We need a proper energy mix

Magdolna Tokai (Alteo) has a slightly different view of the markets. She recalled that episodes of negative prices are happening in Hungary, while that last August and September very high prices were recorded on HUPX, up to EUR 1,000 per MWh, and above EUR 500 per MWh in Croatia and Serbia.

“We have to be prepared for that, which is data, data, data, and the cooperation of all the market players, providing the proper energy mix, and the proper product for the TSO,” she pointed out.

Marko Zarić (EMS) stressed time as a vital ingredient for developing markets. A transition from the regulated market to the truly open market envisages multiple steps that take time, he said.

Flexibility platforms need time for implementation

Nikolaj Candellari and Marko Zarić (photo: Balkan Green Energy News)

Another big change are the balancing platforms developed by aggregators. Traditionally, TSOs were buying the same kind of standardized product, for example, SCADA, EMS, and other market applications, with more or less the same kind of functionalities.

Elena Boškov Kovač (Blueprint Energy Solutions) brought up the question of a more standardized approach. “Before we start talking about interoperability and connecting with everything else, would it be good to at least have platforms with similar kinds of functionalities and services provided?” she asked.

According to Luka Renko (KOER), every platform is structured in line with the needs of the operator. The communication platforms are more or less standardized, but it depends on what one needs in the background and what kind of assets they drive.

Piloting a flexibility platform can take years

The two aggregators, KOER and Alteo, developed their platforms because they couldn’t find a ready-made solution on the market.

A platform must have the ability to communicate with any other solution and to integrate new types of power plants and customers, Magdolna Tokai (Alteo) added.

Elena Boškov Kovač (Blueprint Energy Solutions) recalled that her company has implemented flexibility platforms since 2019, at the dawn of the opening of the flexibility market in Europe, and added that pilot projects for them take a long time.

“They require an immense amount of data. There’s a multitude of different stakeholders that need to support this, unlock the data, provide data resources. Piloting is incredibly important, and it can take years,” she pointed out.

Luka Renko (KOER) added that it took his company three to four years to start working as an aggregator in Croatia.

The future is bright, but we need to work on it

The panelists with Branislava Jovičić, Founder and Editor of Balkan Green Energy News (photo: Balkan Green Energy News)

Summarized, here are the messages of the session’s participants:

Bernard (NGEN): The end consumer will start acting as an active buyer.

Zarić (EMS): We see changes in the future.

Candellari (CyberGrid): Open the markets.

Tokai (Alteo): Give a chance to all market participants and types of production.

Renko (KOER): Digitalization will help.

Elena Boškov Kovač (Blueprint Energy Solutions) praised the companies that had their representatives at the panel for starting to develop solutions ahead of the market reform.

“It’s also a good message to the system of sometimes sleepy energy companies waiting for their proprietary vendors to offer them solutions,” Boškov Kovač stated.

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May 27, 2025
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Greece launches Attica-Crete subsea power interconnector

The Attica-Crete subsea power interconnector has been put into trial operation, marking a milestone for Greece’s transmission system. The country now has a high-voltage direct current (HVDC) interconnection, and its largest island is fully integrated into the national electricity system, according to an announcement by the Independent Power Transmission Operator (IPTO or Admie).

The Ariadne subsea power interconnector entered into operation on May 24 with the successful transfer of direct current electricity, said IPTO, whose subsidiary Ariadne implemented the project. The trial operation phase is expected to last throughout the summer, IPTO added.

The two submarine power links have ended Crete’s electrical isolation

Combined with the existing interconnection via the Peloponnese peninsula, the new cable has completely ended Crete’s electrical isolation, making it an energy hub with significant environmental and economic benefits for the country and the local community, according to IPTO.

The first power link between Crete and the mainland is the 174-kilometer alternating current (AC) cable linking the island with the Peloponnese. It was completed in 2021, following an investment of EUR 380 million.

The EUR 1.1 billion Ariadne interconnector is among the deepest in the world

The Ariadne interconnector, which cost over EUR 1.1 billion to build, is one of the deepest subsea power cables in the world. It consists of two 500 kV cables of 500 MW each, laid at depths of up to 1,200 meters. The construction lasted 4.5 years.

Greek Minister of Environment and Energy Stavros Papastavrou stated that the new power link has made Crete a “central pillar in the country’s energy transition,” and IPTO CEO Manos Manousakis claimed it is opening “a new chapter for the island’s energy security.”

The project was co-financed through the National Strategic Reference Framework (NSRF 2014-2020 and NSRF 2021-2027), via the European Union, with up to EUR 535.5 million.

IPTO recalled that the project consisted of many large subprojects, with contractors including Siemens, Terna, Nexans, Prysmian, NKT, and Hellenic Cables.

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May 17, 2025
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Works beginning on North Macedonian side of gas interconnector with Greece

The North Macedonian section of the gas interconnector with Greece is expected to be completed by early 2027. The construction contract was signed by the Ministry of Energy, Mining and Mineral Resources, domestic contractor Rapid Build and the country’s gas transmission system operator Nomagas.

The construction of the gas pipeline connecting North Macedonia with Greece is set to begin in a month, according to officials. Land expropriation is 90% complete. The initial capacity of the interconnector would be 1.5 billion cubic meters per year, with a potential to double it. The works are expected to be completed within 22 months.

„With the signing of the contract for the construction of the Macedonian section of the gas interconnector with Greece, we are marking the beginning of the largest energy investment in North Macedonia in the last ten years. The interconnector is proof that when there is political will, regional trust, and professional dedication – the results are real and tangible,” said Minister of Energy, Mining and Mineral Resources Sanja Božinovska.

The contract was signed by the ministry, contractor Rapid bild, based in Kumanovo in North Macedonia, and the country’s gas transmission system operator Nomagas. The future pipeline would be able to carry both natural gas and hydrogen.

Repeated tender slashes price by EUR 12 million

The winning bid was EUR 59.9 million or EUR 12 million less than in the initial tender, which was annulled.

The project is worth over MKD 5.1 billion (EUR 82.9 million). It is financed by the European Investment Bank (EIB) and the European Bank for Reconstruction and Development (EBRD). It includes grants of EUR 2.5 million for technical assistance and another EUR 9.9 million via the Western Balkans Investment Framework (WBIF).

The project is financed by the EIB and EBRD

„This contract ensures diversification and access to a greater number of natural gas sources, enables economic development, progress and environmental protection, and contributes to the security of energy supply,” said Executive Director of Nomagas Muhamet Elmazi.

Gasification would significantly improve air quality, especially in areas where wood and fuel oil are currently used for heating.

Greek section of interconnector under construction since February

On the North Macedonian side, the interconnector route is 68 kilometers long, out of a total of 123 kilometers. It will run from Nea Mesimvria in Greece through Evzoni (Mačukovo) and Gevgelija at the border, to Negotino. The next phase involves building gas links from Gostivar to Kičevo (34 kilometers) and from Sveti Nikole to Veles (28 kilometers).

Greek company Terna began constructing its country’s section of the pipeline in February.

Nomagas and Greece’s National Natural Gas System Operator (DESFA) made their final investment decision a year and a half ago.

The companies leaned the investment on the project for the Alexandroupolis LNG Terminal. The liquefied natural gas facility in northeastern Greece was opened on October 1. However, due to a malfunction, it has been out of operation for more than three months. According to the latest update, gradual reactivation is expected to begin by the end of May.

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May 11, 2025
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Serbia’s TSO EMS signs grid connection contracts for 11 renewable power plants

Serbia’s transmission system operator Elektromreža Srbije signed grid connection contracts today for 11 renewable power plants.

TSO Elektromreža Srbije (EMS) noted that the contracts were signed after the second interval for the preparation of studies for the connection of power plants to the transmission grid. The total capacity of the facilities within the new deals is 2,052 MW, the company added.

They include four self-balancing solar power plants that state-owned power utility Elektroprivreda Srbije (EPS) is developing with the consortium Hyundai Engineering – UGT Renewables under a strategic partnership. The contracts were signed by EMS CEO Jelena Matejić and EPS CEO Dušan Živković.

The grid connection contracts were signed for Salaš and Sikole (490 MW in combined capacity), Jablanica (421.5 MW), Bački Gračac (65.9 MW) and Srpska Kuća (27 MW). Their total approved connection capacity is 1,004.4 MW.

Two projects with grid connection contracts are for hybrid power plants

Five other projects on the list are also for photovoltaic plants: East One (49.5 MW), South Two (44 MW), Erdevik (74 MW), Solar Knjaževac (136 MW) and Palić (110 MW). Two are for energy parks – hybrid power plants combining wind and solar energy – Vida Power with 150 MW and Equinox with 277 MW.

Projects East One and South Two are developed by Hive Energy, Erdevik by Fortis and Solar Knjaževac by Central Europe Energy Company, owned by China’s GCL. CWP Europe is in charge for two hybrid power plants.

Of note, in October 2024, the Government of Serbia launched the strategic partnership with the consortium Hyundai Engineering – UGT Renewables, which was selected at a tender for the investment. It envisages solar power plants with a total connected power of 1,000 MW, or 1,200 MW in nominal terms, and battery energy storage systems (BESS) of 200 MW in overall capability and 400 MWh in capacity.

UGT Renewables CEO Adam Cortese told Balkan Green Energy News that the consortium’s strategic partnership with Serbia for the six photovoltaic facilities is worth EUR 1.6 billion.

Minister of Mining and Energy Dubravka Đedović Handanović said in January that the first works on the project are expected by early 2026.

EMS has two intervals per year for the preparation of grid connection studies

Every year EMS organizes two intervals for grid connection studies: from March 1 to June 30 and from September 1 to December 31. After the contract for the grid connection study is signed and the study is completed, investors must submit bank guarantees to sign the grid connection contract.

The grid connection contract that has been signed now is part of the interval initiated on September 1, 2024.  The contracts for the grid connection studies have been signed for 22 projects, and grid connection contracts have been signed for 11.

In the next interval that started on March 1, 2025, EMS has received eight applications, including two for batteries, the first such projects in Serbia.

In July of last year, EMS announced that September 1 would mark the start of the new interval for the preparation of studies for the connection of power plants and other facilities to the transmission grid.

In the previous interval, bank guarantees for solar, wind and hydropower projects and substations, within the transmission system in Serbia, were provided for 28 facilities with an overall capacity of 4,000 MW, according to EMS.

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April 30, 2025
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Investors in BiH developing 3,800 MW of wind, 12,500 MW of solar

Wind farms with a capacity of 3,800 MW and solar power plants with a capacity of 12,500 MW are currently in various stages of development in Bosnia and Herzegovina, according to the indicative plan for the development of production  2026-2035, published by the Independent System Operator in Bosnia and Herzegovina.

The goal of the ten-year plan is to provide information on projects initiated for the construction of new production capacities to be connected to the transmission system, according to the transmission system operator (TSO), Independent System Operator in Bosnia and Herzegovina (NOSBiH).

The plan is supposed to prioritize covering domestic consumption and capacity needs with domestic resources.

NOSBiH said investors continued in 2024 to apply with their renewable energy projects. The interest in grid connections wasn’t affected by the significant reduction in electricity purchase prices, especially for the hours when solar power plants typically produce, it added in the plan

A lack of transmission capacities could become an obstacle to the export of electricity

According to the register of the applications for grid connections, which Elektroprenos BiH manages, there are about 3,800 MW of proposed wind farms and 12,500 MW of photovoltaic facilities in various stages of development, NOSBiH underlined.

Results of an adequacy assessment showed that increasing production makes it possible to increase exports. BiH’s TSO warned that in such a scenario, the currently planned transmission capacity expansion wouldn’t be sufficient.

Another 100 MW of solar is seen coming online in BiH by the end of 2025

With the current production development plans, the system could be left without sufficient balancing capacities. NOSBiH therefore called for developing balancing capacities in parallel.

The document shows that four solar power plants of 206 MW in total were added last year to the transmission network in BiH: FNE Zvizdan (28.5 MW), SE Bileća (55 MW), FNE Hodovo (92.47 MW), and FNE Deling invest 1 (29.75 MW), together with one wind farm, VE Ivovik, of 84 MW. In February of this year, the Ivan Sedlo wind farm (25 MW) was also put online.

By the end of 2025, the start of trial operation of another five PV plants is expected, the plan showed. They would have 100 MW altogether: FNE Hodovo F1-F4 (11.96 MW), FNE Brotnjo (9.98 MW), FNE Polog 1-8 (7.99 MW), FNE Plavo Sunce 1-2 (40 MW) and FNE Livno 1-6 (27.6 MW).

Batteries can bridge the period until the transmission grid capacity becomes adequate

The plan anticipates a similar tempo of grid connections for 2026, too.

In that case, along with the integration of renewables into the distribution network and similar power plants coming online in neighboring countries, a congestion can appear in the transmission network, together with complications in operating the country’s transmission system from a regulatory point of view, NOSBiH said.

Battery energy storage systems can solve both potential issues in the medium term, until investments get the transmission grid to an adequate level, it suggested.

BiH needs battery capability of 225 MW and 450 MWh in total capacity

The company recalled that a year ago it produced a study, together with the Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ), provisionally called Operational Models for Battery Energy Storage Systems in the Balancing Market of NOS BiH.

They estimated the need for additional balancing based on hour-by-hour production profiles for facilities of 1,500 MW in total photovoltaic capacity and 1,000 MW of wind. The authors said a combined 225 MW in battery operating power is required and an overall capacity of 450 MWh.

The study also explored revenue generation opportunities for BESS, particularly through participation in the ancillary services market.

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April 17, 2025
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Montenegro’s EPCG, DSO, TSO to establish Consolidated Data Center

The three key companies in the electricity sector of Montenegro – Elektroprivreda Crne Gore (EPCG), distribution system operator (DSO) CEDIS, and transmission system operator (TSO) CGES – have signed a letter of intent to start strategic cooperation on the installation of the Consolidated Data Center (CDC).

The initiative for the construction of the Consolidated Data Center represents a significant step towards the digital transformation of the Montenegrin power system and the establishment of a modern information hub, according to EPCG, CEDIS, and CGES.

Within the partnership, the three companies are jointly invest resources and know-how to create a technologically advanced data management system and digital services. The Consolidated Data Center will be located in the Željezara Nikšić industrial complex.

CDC’s capacity could be used commercially for the needs of other institutions and businesses

Apart from CDC’s primary role, the modernization of the state-owned power companies, its capacity could offer services to other institutions and companies.

The signatories have already initiated the first step – the preparation of a feasibility study that will define the technical and economic parameters of the project. Based on its results, a special agreement will be adopted to specify the next steps.

EPCG CEO Ivan Bulatović said the Consolidated Data Center isn’t just an infrastructure project.

Bulatović: The goal is to create a system set for the challenges of the future

“It is the foundation of digital transformation that will enable more accurate data analysis, greater efficiency in decision making, and a safer power system. Our goal is to create a system set for future challenges. Digitalization is an inevitable step in the modernization of the sector, and CDC is a key segment of that process,” Bulatović stressed.

According to Vladimir Ivanović, CEDIS CEO, the cooperation of key Montenegrin energy companies is significant, as is providing support to other businesses.

Ivanović: CDC to enable better coordination between companies

“The development of the power system doesn’t only mean investments in the grid and capacities, but also in smart solutions enabling greater flexibility and safety in operations,” Ivanović noted.

He underlined the CDC’s role in improving coordination between companies, reduction of operating costs, and improvement of IT infrastructure.

Asanović: A strong step forward in the modernization of the sector

CGES CEO Ivan Asanović stressed the project’s importance for digitalization and the creation of a system that will enable more efficient management of power resources at the level of the entire country.

CDC represents a strong step forward in upgrading the sector and ensures a better connection between all key participants in the power system, according to Asanović.

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