Electricity Aggregation: A Key Service for a Stable and Resilient Energy System
Series: Essential Services of Critical Infrastructure
For decades, the electricity system was built on the principle of a few large power plants supplying millions of consumers. Today, however, the energy sector is changing faster than ever before. Thousands of photovoltaic power plants, wind sources, battery storage systems, heat pumps, smart buildings, and charging stations for electric vehicles are entering the grid. Electricity no longer flows in only one direction – from producer to consumer. The modern electricity system is becoming a dynamic ecosystem in which both producers and consumers are active market participants.
Coordinating such a large number of devices would not be possible without modern digital technologies. This is precisely why electricity aggregation is gaining ever greater importance. It ranks among the essential services of the energy sector and represents one of the pillars of the future stability of the electricity system.
Classification under the Act on Critical Infrastructure
In Annex No. 1 of Act No. 367/2024 Coll. on Critical Infrastructure, this essential service is classified as follows:
Sector: Energy
Subsector: Electric Power Industry
Essential Service: Electricity aggregation
Category of Entities: Electricity market participants pursuant to a special regulation (§ 3 letter b), points twelve, seventeen, and twenty of Act No. 251/2012 Coll. on Energy, as amended)
Central Authority: Ministry of Economy of the Slovak Republic
What Is Electricity Aggregation?
Electricity aggregation is a service through which an aggregator combines the generation, consumption, or storage of electricity from a larger number of devices and manages them as a single unit. This may involve photovoltaic power plants, battery storage systems, industrial technologies, smart buildings, electric vehicle charging stations, or other flexible resources.
Instead of the transmission or distribution system operator communicating with thousands of individual devices, it communicates with a single aggregator, which ensures their coordinated management.
In real time, an aggregator can:
- increase or decrease electricity consumption,
- activate battery storage systems,
- coordinate generation from renewable sources,
- provide ancillary services to the transmission system operator,
- help maintain the stability of the electricity system.
This is a service that interconnects the energy sector, digital technologies, automation, telecommunications, and cybersecurity.
Why Is Aggregation So Important?
Electricity generation from renewable sources depends on the weather. At the same time, electricity consumption constantly changes throughout the day. For the electricity system to remain stable, a balance between generation and consumption must be ensured at every moment.
It is precisely aggregators that provide the necessary flexibility.
If, for example, there is a sudden drop in generation from photovoltaic power plants due to cloud cover, the aggregator can, within a few seconds, activate battery storage systems or coordinate a reduction in consumption among selected customers. In this way, it helps prevent power outages and contributes to the reliable operation of the grid.
Without aggregation, the further development of decentralized energy and smart electricity grids (Smart Grids) would not be possible.
Did You Know That…?
- The Continental European electricity system is among the largest synchronized power grids in the world and supplies electricity to more than 400 million inhabitants.
- The frequency of the electricity system must remain as close as possible to 50 Hz. Even small deviations may signal an imbalance between electricity generation and consumption.
- At the end of 2025, approximately half of the electricity generated in the European Union came from renewable energy sources, significantly increasing the need for flexibility services.
- A single aggregator can coordinate thousands of devices located in different places and create flexible capacity comparable to a large generation source.
- Seconds matter. In the event of unexpected changes in the electricity system, it is necessary to respond practically immediately in order to maintain grid stability.
What Risks Does Electricity Aggregation Bring?
The development of this service brings significant benefits, but at the same time creates new security challenges.
Technological Risks
Aggregation depends on extensive digital infrastructure, smart metering systems, communication networks, and automated control algorithms. A failure of any of these elements can affect the aggregator's ability to provide flexibility services.
Software errors, the failure of cloud solutions, or an outage of data connections also pose risks.
Cyber Risks
Aggregators work with thousands of devices connected to the grid. Their information systems represent an attractive target for cyber attackers.
A successful attack can lead to:
- disruption of flexibility management,
- unauthorized manipulation of generation or consumption devices,
- disabling of communication systems,
- leakage of sensitive operational data,
- threats to the stability of the electricity system.
As the digitalization of the energy sector grows, cybersecurity will be one of the decisive factors in the resilience of this essential service.
Geopolitical and Supply Chain Risks
Modern energy technologies are largely dependent on global supply chains.
Many battery technologies, semiconductors, communication components, and control systems come from abroad. Geopolitical conflicts, trade restrictions, or disruptions to supply chains can negatively affect the ability of aggregators to develop or operate their solutions.
For this reason, ever greater emphasis is being placed on diversifying suppliers, assessing strategic dependencies, and building resilient supply chains.
Aggregation as Part of Energy Security
Electricity aggregation is no longer merely a commercial service on the electricity market. It is becoming an important tool of energy security.
It helps to:
- increase the stability of the electricity system,
- use renewable energy sources more efficiently,
- reduce the need to build new peak power plants,
- support the development of smart distribution grids,
- strengthen the energy resilience of the state.
With the growing number of decentralized sources, the importance of aggregation will continue to increase.
The Perspective of the Critical Infrastructure Association of the Slovak Republic
The development of electricity aggregation brings new opportunities, but at the same time also new security challenges. Critical entities will have to pay ever greater attention to the resilience of the digital systems, supply chains, and technologies on which the provision of this service is based.
The Critical Infrastructure Association of the Slovak Republic supports its members primarily through expert analyses, monitoring of strategic risks, the exchange of experience, and professional consultations aimed at increasing the resilience of critical entities. An important part of this support is also the identification of new risks arising from the digitalization of the energy sector and the preparation of organizations for their effective management.
The Future of Energy Will Be Flexible
The energy sector is undergoing one of the greatest transformations in its history. Electricity aggregation represents a technology that makes it possible to safely integrate a growing number of renewable sources, battery storage systems, and smart devices into the electricity system.
From the perspective of critical infrastructure, this is not merely a modern energy service. It is an important element whose reliable operation will increasingly influence the continuity of electricity supply, the resilience of the energy sector, and the safe functioning of the state.
In the next installment of the series, we will present another of the essential services of critical infrastructure and outline its importance for the safe functioning of the state, the economy, and everyday life.
