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Energy communities reduce power bills for members, improve electricity market

Citizen energy communities make the energy system greener and benefit society at a local level, Josh Roberts from European federation of energy communities REScoop said in his presentation, organized in Belgrade by Deutsche Gesellschaft für Internationale Zusammenarbeit (GIZ) GmbH. It is a form of association that also lowers costs for households, institutions and small firms and entrepreneurs, and contributes to the deployment of progressive technologies. Furthermore, it is a framework for democratic control.

The event included developers from the emerging segment of energy communities and cooperatives in Serbia. They outlined the current initiatives and pointed to challenges regarding market entry, financing and policies.

The establishment and operation of energy communities is arranged through the European Union’s latest legislation, as well as in Serbia and other Western Balkan countries, but they are not a new concept. For instance, such entities still accounted for almost half of wind power output in Denmark in late 1990s, according to Senior Policy Advisor Josh Roberts from REScoop, the European federation of energy communities and cooperatives.

Speaking at a gathering that GIZ organized in Belgrade he pointed to the benefits for citizens, small firms and entrepreneurs and for institutions from setting up or joining energy communities. Initiatives in Serbia were also presented, and their progress in the same field, and the event included dialogue on the necessary technical solutions for connecting to the distribution grid.

Brussels-based REScoop was founded in 2013. In its membership are organizations from 22 European countries. They include Serbian energy cooperative Elektropionir. It gained the most ground regarding association and the implementation of projects.

One coal town has put up signpost for energy communities in Slovenia

Among other examples, Roberts highlighted Slovenia’s first energy community with a rooftop solar power plant for joint use. The facility is on the roof of an elementary school. The project involves aid for people living in energy poverty and it is free to join the group.

It is in the town of Hrastnik in a former coal industry area. The participants already lowered their power bills by 30%, and the gains will be even greater when they pay off the loan, Roberts said.

There are more than 1,600 energy communities in Austria

The representative of the REScoop federation stressed that municipalities in the Belgian region of Wallonia have succeeded in obtaining the right for citizens to participate in investments in green energy projects. It resulted in the foundation of a range of energy communities.

Roberts especially commended Austria’s legal framework with regard to enabling citizens to participate. The country hosts more than 1,600 energy communities.

Udruzivanje energetske zajednice smanjuje troskove trziste elektricne energije Dzos Roberts Josh REScoop GIZ

Energy community eases grid operator’s job

Energy communities are envisaged to return the invested funds to society at the local level. Subsidies are especially favorable for that, Roberts explained. Income is directed to education, infrastructure and aid against energy poverty.

The essence is that the community controls the distribution of the proceeds. In addition, grid operators can communicate more easily with one entity than with a hundred prosumers, Roberts underscored. Prosumers – or buyers-consumers, as they are formally called in Serbia, generate electricity for their own needs.

Pooling together enables providing services in the market, where energy communities can supply and store energy as well as conduct energy efficiency services, among other activities.

It means an entity of such type can ease the evening grid load, in moments of the highest demand, using energy from its batteries. That way, price peak shaving is achieved.

Registration process must be separate from defining activity

As for the procedure, Roberts said registration needs to be only for acknowledgement, rather than for approving specific activities.

“It’s about acknowledging the legal form and it’s about checking about how that legal form ensures compliance with the eligibility criteria. We have found very complex registration procedures. This does not work. It needs to be simple,” he stressed.

There are many activities that energy communities can undertake and they need to be able to enter them gradually, without complex procedures for licenses and permits

Conversely, in some jurisdictions there are simplified ways to get a supplier license. It enables an energy community to enter the activity gradually, instead of having to fulfill the requirements for all segments, even without having a comprehensive business model, the members or a business case, Roberts said.

He mentioned at the same time that one of the basic ideas is promoting inclusiveness.

“It’s already hard to set up an energy community, but it’s even harder to involve members who may have a hard time paying their bills, or have a lot less disposable income. So we found that the best models at the moment are for energy communities either to front the membership fees or for local authorities to pay for this upfront. And in energy sharing, we’re seeing more and more of energy donated to vulnerable households,” he stated.

Energy cooperatives helping improve rural areas from which people are leaving

Energy communities are giving people an opportunity for climate action and to contribute to their community, Roberts said. He added that such projects improve the area where they are conducted, stressing that it is especially important for rural areas from which many people are leaving.

A key point is that they enable participants to control their costs, production, consumption and energy sharing.

 The main challenge in Serbia is how to obtain a grid connection, alongside the matter of accessibility of incentives and loans

Importantly, energy communities are linked to the tradition of cooperatives, for which Serbia used to be known, but there is still much left to do around the legal framework.

There was word at the said gathering with representatives of institutions about the complexity of adjusting the electricity network to the production’s decentralization, as well as about the possibility to streamline the procedure for the establishment of energy communities and their operation.

Serbia is yet to address the accessibility of subsidies and financing, while currently the main issue is how to get grid connection approvals.

Energetsko zadrugarstvo smanjuje troskove trziste elektricne energije GIZ

Enterprise, association or cooperative

The speakers and other participants in the event agreed that the electricity market isn’t complete without energy communities, while that they modernize and democratize it.

When it comes to Serbian regulations, such legal entities have the right to conduct aggregation, but they need a license for it. Notably, aggregators have balancing responsibility, so they need to cover the deviations from the forecasted output.

Energy communities were introduced in the latest version of the Law on Energy. When they become regular in practice, the framework will need to be adjusted gradually to the situation. Citizens, firms and municipal authorities establish energy communities as enterprises, associations or cooperatives.

The bottom line is to enable citizens to take part in the clean energy transition and achieve local environmental, economic and social benefits, as opposed to prioritizing profits. It implies collective ownership, democratic control and reinvestment into the community with the goal of reducing energy poverty and promote energy independence.

The basic technical requirement for members is to have a smart electricity meter.

Elektropionir pioneering agrisolar in Serbia

The event’s organizers gathered the people who achieved the first steps in Serbia – from the Sunčani krovovi (Sunny Roofs) energy cooperative, created in 2019, to Platform for Energy Transition, which participated in uniting three residential buildings in Niš, which have a joint solar power plant and electric vehicle chargers. It is one of the first six prosumers in Serbia in the category of homeowner associations.

The Elektropionir energy cooperative managed through crowdfunding to install two cooperative-owned rooftop solar power systems on the territory of the City of Pirot, on the buildings of a local community council and a cultural center. As part of the Solarna Stara project, on Mt. Stara planina, the two villages receive the income from the sale of surplus electricity.

Srem is set to become the main region in Serbia for community energy

Next, the same organization built the first agrisolar power plant in Serbia. The 20 kV facility is at an organic farm, Organela, near the city of Valjevo.

Another recent undertaking is a rooftop photovoltaic unit on a school in the town of Ruma, envisaged to be the basis for an energy community. In the same area, Elektropionir is working on the installation of several prosumer power plants on house roofs and on aggregating them, inspired by the enthusiasm and the solar system of its member Nenad Maričić.

Owners and neighbors can jointly invest and they will be able to become an energy community and share energy among themselves.

Center for Sustainable Development to integrate string of energy systems of various technologies

Near Ruma, which is in the Srem (Syrmia) region, the City of Sremska Mitrovica and Regional Development Agency Srem have launched a major project. It is for the establishment of renewable energy communities (RECs), which are essentially a subset of citizen energy communities (CECs).

The local authority provided land for research and development. It is next to the regional waste landfill and a wastewater treatment plant. The plan is that the Center for Sustainable Development builds and integrates a string of energy systems.

They would include combined heat and power (CHP) production – cogeneration – from biomass, small wind turbines and a PV plant. The project also involves heat pumps and a storage facility assembled from old batteries.

There would be a facility running on biogas from the landfill within the center, and a magnet electric generator. Residents of the adjacent village of Jarak would be able to join the energy community.

Belgrade Energy Community is focused on equity, solidarity

Another group emerging in community energy is Belgrade Energy Community. It intends to apply a model of collective self-consumption in an urban area, with a focus on trust, equity and solidarity.

Its idea is to enable people to generate, share and use green energy. The plan is to map roofs and consumption and set up the first pilot installations.

According to the Belgrade Energy Community, it will donate 5% of the output to households affected by energy poverty. It consists of a cooperative, a civil society organization, two small enterprises, several prosumers and citizens.

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Virtual power plants: How they work and who can benefit from extra income

Virtual power plants, aggregators, and flexibility are gaining increasing attention, and not just within the energy sector. The growth and volatility of electricity prices have forced many businesses and institutions to install solar panels to cut costs. Virtual power plants – set up by aggregators to provide flexibility services – can generate additional income for new electricity producers and consumers capable of reducing or increasing consumption or storing energy.

The deployment of solar panels across Europe, including the Western Balkans, is experiencing remarkable growth, bringing numerous benefits to all who choose to produce electricity for self-consumption and become prosumers. Two of the four D’s of the energy transition are already underway – democratization and decentralization – resulting in increasing numbers of small energy producers and growing amounts of distributed (decentralized) production from renewable energy sources.

This has led to the emergence of aggregators – firms that connect multiple small producers, or even large-scale solar power plants or wind farms, with energy consumers capable of reducing or increasing consumption on demand, and with energy storage systems. The result is the virtual power plant, which functions like a real power plant thanks to software that connects and harmonizes all these actors.

Such a system can “iron out” the variability of renewable energy sources – solar or wind, and offer a more predictable energy delivery to the market as well as auxiliary services and on-demand flexibility to the system.

Naturally, this brings revenue, which is distributed among the members. For all this to work in practice, a lot of regulation is needed, and it is slowly being adopted in this region. Although they have not yet reached their full potential, there are already virtual power plants and aggregators in Bosnia and Herzegovina, Croatia, Hungary… But how does it all look in practice?

Energy Institute Hrvoje Požar joins virtual power plant KOER

By concluding an aggregation agreement, Energy Institute Hrvoje Požar (EIHP) has joined the KOER virtual power plant. Specifically, EIHP made available its 50 kW solar power plant, installed on the roof of its office building, to KOER, an aggregator on the Croatian electricity market.

Minea Skok, head of the Scientific Council and senior researcher at EHIP, explains to Balkan Green Energy News that KOER has conducted preparations for including the EIHP solar power plant in the virtual power plant.

The aggregator has installed control and metering equipment that enables the reading of electricity production from the existing electricity meter, along with software that enables data aggregation and forwarding to the transmission system operator, real-time 24/7 monitoring and alerting, reporting to the operator and the owner, and cost calculation.

It also conducted internal tests of the EIHP solar power plant’s balancing energy.

KOER provides services to Croatia’s transmission system operator HOPS

KOER’s virtual power plant, along with eight other providers on the Croatian market (aggregators and network users), provides services to the Croatian Transmission System Operator (HOPS), which is responsible for organizing the balancing market throughout Croatia, Skok explains.

Currently, the service involves balancing through the activation of balancing energy from a contracted mFRR (manual frequency restoration reserve), and soon also from aFRR (automatic frequency restoration reserve), according to her.

These system services are essential for any country’s transmission system operator to maintain power system balance, ensuring that all consumers have enough electricity at all times. These services also provide flexibility, which is increasingly in demand due to the growing share of solar power plants and wind farms – energy sources that are not flexible, since they only generate electricity when the sun is shining or the wind is blowing.

KOER and EIHP split the earnings 50-50

As for EHIP’s compensation for providing these services, Skok revealed that the contract defines the compensation received by KOER, as the aggregator, is split 50-50 with EHIP.

For the provision of these services, HOPS organizes tenders in which KOER competes with other service providers.

Skok emphasizes that EHIP’s solar power plant is profitable on its own, as it brings savings through lower electricity bills, which means the service fee is additional income.

On top of all that, gaining practical experience is an added value for EIHP, says Skok.

EIHP will also install a heat pump and a battery

The 50 kW photovoltaic power plant, matching the maximum available roof space of the EIHP building, was put into operation nearly a year ago.

Its average annual output is about 50,000 kWh. The EIHP building’s electricity consumption used to be 186,539 kWh, but thanks to energy renovation and the option of working from home, it was reduced. As a result, in the first ten months of operation, the power plant covered 53% of EIHP’s electricity consumption.

Following the energy renovation and the installation of solar panels, EHIP now plans to install a heat pump and a battery.

With its solar power plant, EIHP makes an additional contribution to power system balancing. By adding flexibility on the consumption side through the planned installation of a battery system and a heat pump, and in cooperation with KOER, the aggregator, EIHP contributes to system stability and the integration of new renewable energy sources, according to Skok.

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CyberGrid is committed to energy transition in SEE with its aggregation solutions

Project Manager and Market Intelligence Specialist Nikolaj Candellari from CyberGrid said at the Belgrade Energy Forum 2025 that the company believes in the energy transition in Southeastern Europe and is contributing with its VPP solutions. The Austrian software developer is open to partnerships with aggregators or future aggregators and the region’s electricity transmission and distribution system operators.

CyberGrid connects different energy resources to different markets. It uses cloud-based flexibility management technology and provides software as a service (SaaS).

“Our core belief is that every energy resource should be renewable, or at least green, and flexible. And to support this transition which we are in at the moment, we have developed our own product called CyberNoc,” Project Manager and Market Intelligence Specialist Nikolaj Candellari said at Belgrade Energy Forum (BEF 2025).

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CyberNoc in real time aggregates the assets – batteries, renewables and even loads and is putting them to the markets, Candellari explained.  In this way, the company supports grid stability and resilience and generates additional revenue streams for owners.

“We are heavily present in the region because we believe in this transition in Southeastern Europe. We helped partners in Croatia, Bulgaria and North Macedonia to connect to different markets,” he stressed and added that the firm has established cooperation in Slovenia and Greece.

Candellari called on aggregators or future aggregators, transition and distribution system operators and all other entities in the electricity system to contact CyberGrid.

The company, founded in 2010 and headquartered in Vienna, is one of the friends of the Belgrade Energy Forum, organized in Serbia’s capital city by Balkan Green Energy News.

CyberNoc enables trading, balancing services

CyberNoc manages battery storage, power plants and consumption, optimizing them in line with market and grid conditions. The platform continuously communicates with the transmission system operator (TSO). It facilitates energy trading as well as the provision of balancing services including frequency control reserve (FCR), automatic frequency restoration reserve (aFRR) and manual frequency restoration reserve (mFRR).

Candellari also participated in a panel discussion at BEF 2025 called Market Flexibility: The Backbone of a Resilient Energy System. He recalled that the market went from 15-minute time intervals all the way down to just two seconds and stressed the significance of real-time data for TSOs and other participants.

“I think we can connect everything, including households,” Candellari underscored.

Notably, CyberGrid is part of the SPRINT project, launched at the beginning of the year, for the development of innovative quasi-solid-state sodium-ion batteries for stationary purposes. The endeavor received funding through the Horizon Europe program.

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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.

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“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.