From household flexibility to an open European energy market

Households are adding solar panels, batteries, electric vehicles (EVs) and heat pumps that can help balance electricity supply and demand. Unlocking their flexibility at scale means connecting these devices to the energy market in ways that let households participate without managing every detail.

The European Commission’s Citizens Energy Package sets out measures to protect and empower consumers. That ambition raises a practical question: how can millions of household devices take part in an open flexibility market without making energy more complicated for consumers?

Making flexibility simple for consumers

Household flexibility often depends on consumers managing their assets or providers bundling devices and services. Both models can add value, but neither model alone is likely to deliver the scale European markets need.

Most consumers do not want to decide every day when to charge their EV or discharge a battery. Flexibility should largely work in the background.

Freedom of choice is part of this. Consumers should be able to choose who manages their flexibility and switch providers easily. That requires connecting flexible devices and creating a competitive market for the services built around them.

Interoperability as a prerequisite for competition

Standards and protocols such as EEBUS, Open Automated Demand Response (OpenADR) and the Open Charge Point Protocol (OCPP) address different aspects of device communication, flexibility signals and EV charging. But they cover different parts of a market that remains fragmented.

In my work across European energy markets, I see a need for greater convergence around open, standardized interfaces. Flexible assets should be able to communicate with different service providers through common interfaces. The same applies to aggregators, energy communities and other market participants.

Interoperability may sound like a technical issue, but its implications are primarily commercial. When providers do not need separate integrations for every device or platform, barriers to entry fall. New providers can develop services, and consumers can switch providers more easily. Competition can focus on service value rather than control of the technology.

Competing for consumers, not control of their assets

Flexibility creates value when assets can contribute to markets and consumers retain control over who acts on their behalf. An open flexibility market can enable:

• Consumers to switch providers more easily.
• New market participants to develop services without building custom integrations for every technology.
• Providers to compete on service, value and innovation.
• Flexible assets to participate in a wider range of markets and services.

The Citizens Energy Package aims to give consumers a greater role in the energy transition. Achieving that requires market structures and technical foundations that make participation simple and scalable.

From technical flexibility to a scalable market

The discussion across European energy markets is shifting from whether household flexibility is technically possible to how it can work at scale. Open interfaces and interoperability are central to that effort. Providers need to be able to compete without exclusive control over consumers’ assets.

With the right foundations, flexibility can evolve from individual technology projects into a mature market, giving consumers more choice while helping the energy system make better use of a growing number of distributed energy resources.

Reliable data for an open flexibility market

An open flexibility market needs more than devices that can communicate. It needs meter data that is processed consistently, validated and kept traceable, so market participants can verify energy volumes and settle flexibility services.

When households can switch providers without replacing their devices or rebuilding their setup, providers must compete on service. At scale, interoperable devices and reliable data can turn household flexibility into a resource that helps balance electricity supply and demand and integrate more renewable energy, while giving consumers a meaningful role in the energy transition.