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Wind farms turn Greece into net exporter of electricity

Wind energy played a crucial role in turning Greece into a net electricity exporter last year, for the first time since 2000.

The country used to import a significant part of its electricity in previous years. Back in 2019, net imports amounted to 10 TWh or 18% of total consumption, according to Minister of Environment and Energy Nikos Tsafos. The situation changed and Greece became a net exporter in 2024 with 307 GWh.

The economic benefits are important. The balance was a negative EUR 400 million in 2019, compared to EUR 122 million on the upside last year.

The change is also evident in wholesale electricity prices. Greece used to be 34% more expensive than Bulgaria six years ago. Now the price is about 2% lower.

Tsafos added that wind energy has been the secret behind the trend. Greece has different wind characteristics compared to the rest of Southeastern Europe. At times, wind farms produce large quantities while in neighboring markets their output is low.

Offshore wind to further increase exports

Indeed, Greece aims to utilize its advantage even further by developing offshore wind farms. The National Energy and Climate Plan (NECP) foresees the installation of 1.9 GW by 2030 and 6.2 GW by 2035.

So far, progress has been slow apart from a few pilot projects currently underway. Initial offshore development zones have been identified and the national plan has been updated. However, a presidential decree has yet to be signed to define the exact terms for offshore projects.

Stefatos: Benefits from balancing renewable energy through offshore wind

After the latest geopolitical and trade developments, the global offshore wind power market faces issues regarding increased costs and uncertainty. However, the head of the Hellenic Hydrocarbons and Energy Resources Management Company (HEREMA), Aristofanis Stefatos, believes the potential benefits in Greece outweigh such concerns. “We should include in our calculation the benefit of balancing renewable energy in our energy mix through offshore wind,” he said recently.

Given their large capacity factor, offshore wind parks are expected to operate more as base capacity power plants than the traditional intermittent renewable energy units. A large part could go to exports.

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Low consumption causes grid failure, power outage in North Macedonia

A grid failure caused a brief power outage in North Macedonia in the early hours on Sunday, May 18. Disruptions at the affected 400/110 kV transformer stations were triggered by high voltage levels in the grid, caused by low consumption, typical for nighttime hours and weekends at this time of year, according to a statement by the country’s transmission system operator, MEPSO.

MEPSO said its teams restored normal electricity supply in about an hour and were working to fully normalize the stability of the power system.

According to the update, grid instability caused by low consumption at nighttime and on weekends is a problem shared by almost all transmission system operators in the region and around Europe.

Bulgaria’s energy minister: Bulgaria played the crucial role in stabilizing North Macedonia’s grid

At the same time, Bulgarian Minister of Energy Zhecho Stankov said that a grid failure had affected several countries in Southeast Europe, though not Bulgaria. He added that his country’s balancing facilities were crucial in stabilizing North Macedonia’s grid, restoring supply, and preventing the crisis from spreading further. In Bulgaria, the Electricity System Operator (ESO) is responsible for the transmission network.

He claimed Serbia and Croatia have also experienced problems due to a lack of balancing facilities. “The colleagues from Serbia also had certain difficulties in the morning hours, and we managed to balance them out,” Stankov stated.

EMS has denied that any disruptions or outages occurred in Serbia

However, Serbia’s transmission system operator Elektromreža Srbije (EMS) told Balkan Green Energy news that the country’s grid did not experience any disruptions or outages and that there was no need for assistance from Bulgaria. EMS said it would not specifically comment on the Bulgarian minister’s statement because it was unclear what it was referring to.

In its reply to Balkan Green Energy News, EMS underscores that there were no consequences for the transmission system of the Republic of Serbia, explaining that EMS, at the request of MEPSO, to facilitate the repairs in North Macedonia, temporarily shut down the 400 kV transmission line between the Vranje 4 transformer station and the North Macedonian border.

Renewables had no share in the problem, according to Stankov

Stankov also stressed that solar power plants did not play a role in the crisis, unlike in Portugal and Spain in late April. The grid failure occurred in the early morning hours and amid low renewable energy generation, he said, adding that “renewable energy had no share in the problem.”

Bulgaria plans to build three new pumped storage hydropower plants

Bulgaria’s system remained stable thanks to its generating and balancing capacities, in Stankov’s view. He told the press that the country possesses 90% of all the reactive energy compensation capabilities in Southeast Europe.

Bulgaria is working with the European Investment Bank (EIB) to build at least three pumped storage hydropower plants in the Rhodope region, aimed at further enhancing regional grid resilience, Stankov pointed out. The minister vowed to keep the country’s grid on standby to support other regional networks in need of stabilization.

Stankov revealed that one such project is being developed for the Vacha dam. The other two pumped storage hydropower plants are planned to be built on the Dospat and Batak dams.

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PPC starts building two battery storage systems in northern Greece

Public Power Corp. (PPC Group) is launching construction on two battery energy storage systems (BESS) in northern Greece, of 48 MW / 96 MWh and 50 MW / 100 MWh. There is currently no larger BESS in Southeastern Europe, but the Oslomej solar park in North Macedonia is expected to get a battery system of 62 MW in operating power by the end of the year.

PPC’s Melitis 1 battery system will be located in the vicinity of its future photovoltaic plants in the Western Macedonia region, and Ptolemaida 4 will be built in the area of the former Ptolemaida coal mines. The energy storage units are intended to support the operation of adjacent photovoltaic plants.

The battery systems are targeted for completion within the year

The systems will use liquid-cooled batteries with the lithium iron phosphate (LFP) technology, maximizing both energy utilization and safety during operation, according to a statement from the Greek company, controlled by the government through a minority stake. It expects to complete the construction within the year.

PPC Group’s investment plan for the 2025-2027 period envisages BESS projects totaling 600 MW, which are currently at various stages of implementation in Greece and elsewhere in Southeastern Europe.

Konstantinos Mavros, the group’s deputy CEO responsible for renewable energy sources, said PPC is a leader in investing in energy storage systems. “In the coming years it will significantly increase investments in all flexible generation systems through energy storage,” he stated.

PPC plans 600 MW of battery projects in Southeastern Europe

PPC Group recently started building a battery system in neighboring Bulgaria with 25 MW in operating power and a capacity of 55 MWh. The facility would support the operation of a new solar power plant with a total capacity of 165 MW.

The company runs renewable energy systems with a total capacity of 6.2 GW in Greece, Romania, Italy, and Bulgaria. Its investment plan envisages increasing the capacity from renewables to 11.8 GW by 2027. PPC’s strategic goal is to expand into new renewable energy technologies, such as offshore wind farms and floating solar parks.

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Cities are driving the transition to climate neutral and fair housing

Author: Anna Iafisco, policy adviser for housing at Eurocities, EUSEW’s partner organisation

City governments are ready to lead the transition to climate-neutral buildings by 2050, but they cannot do it alone. To ensure a fair transition, they need EU and national support to help low- and middle-income households access renovation support. With better funding, aligned policies, and tools like one-stop shops, cities can deliver warmer homes, lower bills, and a liveable future for everyone.

The road to climate neutrality runs through our homes – and cities are taking the lead. Buildings account for 40% of Europe’s energy use and 36% of emissions, making the decarbonisation of our built environment both a major challenge and a vital opportunity.

By improving energy efficiency, particularly in the residential housing stock, cities are not only cutting emissions and boosting energy security, but they are also improving people’s quality of life. Crucially, this transformation offers a chance to tackle energy poverty, which still leaves too many households without adequate heating, cooling or lighting, while also addressing the question of equitable access to green and healthy living spaces.

For the transition to succeed, it must be fair. At Eurocities, we believe no one should be left behind, especially vulnerable and low- to middle-income households, often exposed to high energy bills and inadequate living conditions.

Reaching a climate-neutral building stock by 2050 will depend on inclusive, well-funded renovation policies that reflect the realities of Europe’s diverse housing systems, and on empowering cities to lead the way.

A diversity of housing systems, a common challenge

Europe’s housing systems are highly diverse, from strong social and cooperative housing sectors in some countries to more privatised or market-driven systems in others. Any EU-wide building policy must allow for flexibility, enabling local, regional and national governments to tailor solutions to their specific situations.

A one-size-fits-all approach to financing renovation risks excluding those who fall outside strict income thresholds or tenancy rules, particularly in private rental markets, where incentives often do not reach either landlords or tenants. Elsewhere, outdated ownership structures or limited municipal control over social housing create further obstacles.

This diversity must be explicitly acknowledged in EU policy frameworks. We need adaptable rules that empower local authorities to reach those most in need, protect tenants from the risk of displacement, and ensure that EU funding tools match the real conditions on the ground.

One-stop shops: making renovation simple and inclusive

One of the most effective ways cities can support households through the transition to energy-efficient and sustainable homes is by setting up one-stop shops. These local services provide clear, accessible information about renovation options, available grants and loans, technical support, and trusted contractors – all in one place.

In Milan, the ‘Sportello Energia’ (Energy Desk) helps residents navigate energy efficiency improvements, with a special focus on reaching low-income and energy-poor households. The city combines this advisory service with targeted financial support, enabling families to carry out renovations they otherwise could not afford.

Similarly, in Rotterdam, the ‘WoonWijzerWinkel’ offers a physical and digital one-stop-shop, where residents can get free independent advice tailored to their homes. The shop has become a trusted go-to point for citizens who may otherwise be excluded from renovation schemes.

These examples show how local services, when designed with people’s needs in mind, can build trust and boost the renovation rate, especially among the most vulnerable.

Targeting support where it matters most

We know that comprehensive renovations are costly, and many households cannot afford them. That is why targeted public investment is vital. Renovation efforts must focus first on the worst-performing buildings, which are often home to people at risk of energy poverty. This is where we can achieve the greatest impact, both for the climate and for residents’ wellbeing.

In Vienna, a long-standing commitment to affordable housing has positioned the city as a leader in socially inclusive climate action. The city is implementing a large-scale renovation programme for its social housing stock, combining energy efficiency improvements with tenant protection measures and cost control.

Meanwhile, in Ghent, Belgium, the city has partnered with social organisations to reach vulnerable households and co-develop tailored renovation plans. This collaborative model ensures that support reaches those who need it most, while building long-term capacity within communities.

These experiences offer valuable lessons for the implementation of the EU’s revised Energy Performance of Buildings Directive. Cities are ready to roll out building upgrades, but they need clear standards, funding and flexibility to adapt to their local realities.

Decarbonising heating, improving lives

Renovating buildings is only part of the solution. Most homes in Europe are still heated with fossil fuels, particularly natural gas. To meet the EU’s 2050 climate targets, we must rapidly phase out fossil fuel boilers and invest in renewable, efficient heating and cooling systems. This is a crucial step to reduce emissions and protect residents from rising fuel costs and energy insecurity.

Cities are already taking action. In Paris, the city is expanding its district heating network based on renewable energy sources, prioritising connections for social housing and public buildings. This approach not only cuts emissions but also shields residents from volatile energy prices, demonstrating the power of public infrastructure to deliver a just transition.

A vision for truly affordable climate-neutral homes

To fully realise the transformation of the built environment, Europe must also advance a shared agenda for affordable, inclusive, and healthy housing. The upcoming European Affordable Housing Plan presents an opportunity to address the affordability crisis by supporting investment in affordable housing, improving existing stock through deep renovation, and aligning climate, environment and social objectives.

Cities are implementing change, but they need greater support to deliver renovation programmes for social and affordable housing, to develop new housing construction that meets climate neutrality and environmental objectives, affordability and accessibility standards. At the same time, EU funding instruments must be better coordinated and easier to access, so they reflect local priorities and realities.

By embedding the principle of housing as a human right into the green transition, the EU can drive a shift towards housing systems that are not only sustainable, but also fair, resilient and inclusive.

A call to action

If we want to reach climate neutrality by 2050, there is no time to lose. A swift, ambitious implementation of the Energy Performance of Buildings Directive, in alignment with the EU Nature Restoration Law, is essential to meet the 2030 targets and to lay the foundation for a fair, sustainable future.

Despite political pressure, the EU should remain focused on putting the recently adopted directive and regulation into practice, rather than adding further uncertainty to an already complex political landscape.

Cities stand ready to lead this transformation. But they cannot do it alone. We call on the EU and Member States to work closely with city governments, empower them through direct access to funding, and ensure that climate, environment and housing policies support the same goal: better homes, healthier lives, and a liveable planet for all.

The building transition must be about more than cutting emissions. It must ensure that everyone, regardless of income or housing tenure, can live in a decent, energy-efficient and quality home.

If we get this right, we will not just reduce carbon and help restore nature, we will ensure a better future for the people of Europe.

This opinion editorial is produced in co-operation with the European Sustainable Energy Week (EUSEW) 2025. See ec.europa.eu/eusew for more details.

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Alarming rise in unpaid bills from electricity consumers in Greece

A steep rise in arrears was recorded last year in the Greek electricity supply market.

According to the latest report from the Regulatory Authority for Energy, Waste and Water (RAAEY or RAEWW), total debt for electricity rose by EUR 1 billion to EUR 3.4 billion in 2024.

It occurred despite a 10% reduction in retail electricity prices last year in the country.

Out of the total sum, existing customers owe EUR 1.74 billion to their suppliers. Another EUR 1.65 billion is debt by customers that have switched suppliers, leaving unpaid bills behind.

As for the EUR 1 billion of new debt, consumers in the mid-voltage account for EUR 400 million. They are large businesses and small industries. Another EUR 440 million is owed by various water utilities.

In December 2024, the Ministry of Environment and Energy passed a regulation subsidizing water utilities for EUR 200 million of their total debt. It means actual arrears in the segment were smaller, at EUR 240 million, but still sizeable.

Measures to reduce power theft

On top of increasing debt, the Greek market is also faced with a rise in electricity theft. In recent years, the phenomenon has worsened and is estimated to cost law-abiding consumers EUR 400 million per year.

The government and the regulator recently enacted strict fines to reduce theft. Offenders pay more than 100% over the normal power price for stolen quantities. The gradual installation of smart meters starting this year is also expected to help.

Suppliers warn of consequences

Power utilities must handle all the said liabilities. The Greek Energy Suppliers Association (ESPEN) has said that the issues indirectly increase power prices, as companies need to balance their budget through additional hedging and careful positioning.

ESPEN: Suffocating pressure as a result of high arrears

“The accumulation of large arrears causes suffocating pressure to the supply sector, raising prices and leading to negative effects for consumers,” it said.

Furthermore, suppliers asked the Hellenic Electricity Distribution Network Operator (HEDNO or DEDDIE) to waste no time in disconnecting consumers who owe money, in line with guidelines from the network code.

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Alteo’s Chikán: Aggregators have AI solutions for grid stability, production optimization (video)

Factors like power price volatility, the global shift in policy making and the need for flexible solutions for the integration of renewables are creating an important momentum for developers and aggregators, Chief Executive Officer of Alteo, Attila Chikán, said at Belgrade Energy Forum 2025. The company is expanding in Central and Southeastern Europe with investments in power plants and its AI-backed platform for operating third-party assets.

The electricity system needs to become more and more flexible to accommodate weather-dependent, intermittent sources – solar, wind and hydropower, Alteo’s CEO and Chairman of the Board Attila Chikán said and pointed out that the outage in Spain and Portugal on April 28 highlighted the need for investing in grid stability and upgrades.

In his keynote speech at Belgrade Energy Forum (BEF 2025), he stressed that a global shift in policy making in the sector, particularly in the United States and Europe, is bringing both challenges and opportunities. In Chikán’s view, the situation creates an important momentum for developers and aggregators.

“In the past five years we have seen a great deal of price volatility on the markets in the region. If you look into the future, taking into account the impact of the ambitious plans of regional countries to expand renewable power, one might expect even more pressure on balancing price volatility,” he asserted.

Role of international initiatives

Alteo’s CEO said tailored incentive mechanisms are essential for developing a balanced energy mix. There are also major endeavors on an international scale, Chikán added: connecting markets with diverse geographical characteristics, power plant portfolios and different supply-demand balances.

He explained that cross-border initiatives such as PICASSO and the Blue Sky project bring electricity exchanges in the region closer together. Interconnectors like the Pannonian Corridor and the proposed Black Sea green cable contribute to balancing and the management of energy price volatility, Chikán noted.

Future-proof tech solutions required for risk mitigation

In risk mitigation, the energy system’s stability benefits from future-proof technological solutions as well, namely smart metering, advanced weather forecasting and artificial intelligence–based production optimization, he said. This is where aggregator companies like Alteo come into the picture, its chief underscored.

As for its hardware, the company based in Budapest operates a diverse and balanced production portfolio of gas power plants and renewables, combined with storage, Chikán added.

Alteo runs a portfolio of gas power plants, renewables and storage facilities

“Sounds good, but without a well-designed and functional software, any hardware is purely a collection of materials. And even if they do operate, for sure they operate in a suboptimal way, without synchronization,” he stated.

That’s why Alteo developed its own production management platform, which it offers as a software-as-a-service (SaaS) solution as well. The company also supports the operation of 2 GW in third-party capacity, mostly photovoltaics.

“We optimize production in an automated way, using artificial intelligence, integrating real-time weather forecast data, capacity data and market data,” Chikán stressed.

The platform includes executing trading activities. The partners don’t have to deal with scheduling and the balancing energy costs, he said. The company makes a renewable electricity product closer to baseload, Alteo’s head asserted.

Slovakia, Croatia, Serbia are primary investment destinations in Alteo’s regional expansion

Early this year, the company unveiled a strategy for expansion in Hungary as well as into Slovakia, Croatia and Serbia as primary investment destinations. Alteo revealed it is interested in Poland, Czechia, Slovenia, Bosnia and Herzegovina, Montenegro and North Macedonia, too.

Chikán said it also aims to position itself in operations and maintenance (O&M), among other segments. Alteo is particularly seeking stable and reliable AI-based aggregator partnerships, he noted. The company has an investment target of up to EUR 3.5 billion by the end of the decade.