Too much clean energy? The next challenge for Europe’s energy transition

Europe is adding renewable energy at a remarkable pace. But as wind and solar power become a larger part of the electricity mix, another challenge is becoming increasingly important: how can the energy system make the best use of electricity when renewable generation is high?

The issue is already visible in electricity markets. Germany recorded 573 hours of negative wholesale electricity prices in 2025, up from 457 hours in 2024. Spain, Sweden, the Netherlands and France also recorded more than 500 negative-price hours by the end of October 2025.

Negative electricity prices occur when available electricity supply exceeds demand within a market area. Increasing renewable generation can contribute to these situations, particularly when wind and solar production is high while demand is relatively low. Grid constraints can make the situation more difficult by limiting how much electricity can be transported to where it is needed.

This does not mean that renewable energy is failing. Instead, it highlights a new challenge for an electricity system undergoing rapid transformation.

The flexibility challenge

As the share of renewable electricity increases, the ability to balance supply and demand becomes increasingly important.

According to the European Commission, renewable energy could account for around 69% of the EU electricity system by 2030 and around 80% by 2050, compared with 47% in 2024. At the same time, the Commission estimates that the need for electricity-system flexibility will rise from 11% of total EU electricity demand in 2021 to 24% in 2030 and 30% in 2050.

Flexibility means being able to adjust electricity generation, consumption, storage or network operation in response to changing conditions.

This can involve several different solutions: storing electricity when production is high, shifting electricity consumption to periods when more renewable power is available, or using smarter networks to manage electricity flows more efficiently.

The European Commission identifies energy storage as an important source of flexibility, stability and reliability for the future energy system.

Storage can turn surplus into a resource

Energy storage is one of the most direct ways to address periods when renewable electricity production is high.

Batteries and other storage technologies can absorb electricity when it is available and release it later when demand increases. According to the European Commission, increasing storage capacity can help integrate renewable energy, support congestion management and reduce renewable-energy curtailment.

The EU is now taking concrete steps in this direction. On 26 June 2026, the first EU tripartite agreement dedicated to energy storage was signed. The agreement brings together governments, financial institutions, renewable-energy and storage developers, manufacturers and energy-intensive industries to accelerate the deployment of storage.

The European Commission estimates that around 200 GW of energy storage capacity will be needed in the EU by 2030, compared with around 55 GW installed at the beginning of 2026. Storage, however, is only one part of the picture.

The grid needs to become smarter

Electricity does not only need to be generated and stored. It also needs to move efficiently between producers and consumers.

The European Commission describes smart grids as networks capable of monitoring energy flows and responding to changes in supply and demand. When combined with smart meters, they can provide consumers and suppliers with near real-time information about electricity use.

This can help integrate variable renewable sources such as wind and solar, while also accommodating new electricity demand from technologies such as heat pumps and electric vehicles.

Smart grids can also support demand-side flexibility. Consumers can adjust when they use electricity in response to prices or system conditions, while network operators gain better information about how infrastructure is being used.

The need for smarter infrastructure is also reflected in EU investment plans. The European Commission estimates that around €584 billion of electricity infrastructure investment was needed between 2020 and 2030 to support the EU's renewable-energy and energy-efficiency objectives, with a particular need for investment in distribution grids.

From curtailment to better use of energy

When the electricity system cannot accommodate all available renewable generation, some electricity may have to be curtailed — meaning that generation is reduced even though the renewable resource is available.

The European Commission explicitly identifies storage, smart grids and demand-side flexibility as tools that can help reduce renewable-energy curtailment.

This is becoming increasingly relevant as renewable generation expands.

Recent market developments illustrate the challenge. Reuters reported that grid constraints and the rapid deployment of new generation are contributing to congestion in several electricity markets, while periods of negative prices are becoming more frequent. The analysis also points to storage, flexible electricity demand and better grid integration as increasingly important for renewable-energy assets.

What does this mean for a circular energy system?

The concept of circularity can be applied not only to materials, but also to the way energy systems are designed and operated.

A more circular approach seeks to reduce unnecessary losses and make better use of resources already available. In the energy system, this can mean using storage to retain surplus electricity, shifting demand to periods of high renewable generation, sharing electricity through interconnected grids and integrating different energy sectors.

The European Commission is already promoting this type of system integration. Its 2026 work on smart grids highlights the role of flexibility across generation, demand, storage, heating and mobility. It also points to digital technologies and smart-grid solutions as ways to improve the utilisation of existing infrastructure and reduce renewable-energy curtailment.

This approach can also connect electricity with other parts of the economy. For example, flexible electricity demand can come from electric vehicles, heating systems or industrial processes, allowing energy consumption to respond more closely to when renewable electricity is available.

The next step in the energy transition

Europe's renewable-energy transition is entering a new phase.

Building more wind and solar capacity remains important, but the European Commission's data show that flexibility, storage and smarter electricity networks will become increasingly important as the renewable share grows.

The first EU agreement dedicated to energy storage, the growing focus on smart grids and the increasing attention to negative electricity prices all point in the same direction: the future energy system will need to do more than simply produce clean electricity. It will need to use it intelligently.

For the circular energy transition, this creates a clear opportunity. The challenge is no longer just to generate more renewable energy. It is to capture more of its value, reduce unnecessary losses and connect generation, storage, infrastructure and demand into a more flexible system. That is where circular thinking can help shape the next stage of Europe's energy transition.

Sources

• European Commission, Key facts on energy storage

• European Commission, EU-level tripartite agreements – Energy storage

• European Commission, Smart grids and meters

• European Commission, 2026 Communication on the EU electricity system and smart grids

• Reuters, “Negative power prices expose a market opportunity”, 27 July 2026