Decentralised Flexibility in Energy: From Households to Grid Services

Decentralised energy flexibility is reshaping how grid stability is delivered, shifting the focus from large infrastructure to everyday households. As energy systems become more complex, distributed assets such as electric vehicles, batteries and solar PV are emerging as active contributors to system balancing.

This new model was explored during Energy Week Black Sea 2026, where innovative approaches to flexibility and grid services were presented through real-world case studies.

How households deliver decentralised energy flexibility

Jan Hicl, Co-founder and Chief Product Officer of Delta Green, presented a live case study developed with a Czech transmission system operator.

By aggregating around 300 households equipped with EVs, batteries and solar PV systems, Delta Green successfully delivered automatic Frequency Restoration Reserve (aFRR) services — a role traditionally reserved for large-scale assets.

Through this model, revenues generated from ancillary services are shared directly with participating households, turning consumers into active market participants.

The economics of decentralised flexibility

The economic potential of decentralised energy flexibility is significant.

Balancing the Romanian electricity system currently costs approximately 5 billion lei annually, driven by rapid solar expansion, limited forecasting capabilities for prosumers and excess generation during peak periods.

According to Delta Green’s analysis, a household equipped with flexible assets can earn up to 12,000 lei per year by participating across day-ahead, imbalance and reserve markets.

Virtual aggregation and fast deployment

A key advantage of decentralised systems is speed.

The model relies on virtual batteries created through cloud-based coordination of household devices. Instead of waiting years for large storage projects to be developed and permitted, decentralised assets can be deployed within months.

Approximately 200 to 300 households can deliver 1 MW of flexible capacity, responding to transmission system operator signals in real time.

This makes decentralised energy flexibility particularly relevant in regions facing grid congestion and permitting delays.

Households as active grid participants

Jan Hicl highlighted that residential flexibility potential may already exceed industrial flexibility by a factor of six or seven when electric vehicles and home storage systems are included.

As IoT adoption increases and consumers become more engaged, households are evolving from passive electricity users into active participants in the energy system.

This shift represents a fundamental change in how flexibility is sourced and managed across modern electricity markets.

A complementary solution for grid stability

The broader implication is systemic.

Decentralised flexibility does not replace investments in transmission infrastructure or utility-scale storage. However, it can significantly reduce balancing costs, improve system resilience and create new revenue streams for consumers.

For regions such as the Black Sea area, where grid expansion faces delays and congestion challenges, decentralised energy flexibility offers a complementary pathway to stabilising energy systems.

As highlighted during Energy Week Black Sea 2026, part of the solution to grid instability may already exist — distributed across thousands of connected households.