Europe’s Electricity Grid Is Not Ready for What’s Coming

On a windy Sunday morning in October last year, Denmark’s wind turbines produced more electricity than the entire country consumed. The surplus was sold to Norway, Germany, and Sweden at negative prices — the grid operator paid neighbouring countries to take the power. This should have been a moment of celebration. Instead, it illustrated a problem that no amount of turbine installation can solve: Europe’s electricity grid was not built for the energy system it is building.

The Architecture Problem

Europe’s transmission network was designed in an era of large, centralised fossil fuel plants. Power flowed in one direction: from big generators down through the grid to consumers. The network’s architecture — its topology, its switching equipment, its control systems — reflects this assumption.

Renewable energy breaks every premise of that design.

• Generation is decentralised — wind and solar farms are built where the resource is, not where the population is. The best wind is offshore Scotland and the Danish coast. The best solar is in Spain and southern Italy. The demand is in Germany, France, and the Benelux.
• Generation is intermittent — the grid must balance supply and demand in real time. With renewables, the supply side can change by 40 GW in an hour as a weather front passes.
• Power flows in every direction — rooftop solar, community wind projects, and industrial-scale farms all feed into the same grid, creating bidirectional flows the network was never designed to handle.

The Numbers Behind the Gap

The European Commission’s own estimates suggest that the EU needs to double its grid capacity by 2030 to meet climate targets. Current investment falls roughly €50 billion per year short of what is needed. Permitting processes for new transmission infrastructure in most member states take between seven and twelve years from application to energisation.

“We are building the car faster than we are building the roads. At some point the car has nowhere to go, and you have to slow down production — or the whole system jams.”

— Clara Mäkinen, Director of Grid Development, European Network of Transmission System Operators

What Happens When the Grid Can’t Cope

Grid operators have three tools when supply exceeds the network’s capacity to move power: curtailment, interconnection, and storage.

Curtailment

Curtailment means paying wind or solar operators to switch off their generation even when they could produce. In 2023, curtailment across Europe cost approximately €4 billion and wasted an estimated 30 TWh of clean electricity — enough to power the Netherlands for three months.

Interconnection

Interconnectors between national grids allow surplus power to flow to where it is needed. The problem is capacity. The planned subsea cable connecting Spanish solar to French and German markets — the so-called Pyrenean bottleneck — has been in discussion since 2016 and has not broken ground.

Storage

Battery storage is growing quickly but remains too small to absorb the scale of surplus that renewable overproduction generates. Pumped hydro — the most mature large-scale storage technology — is geographically constrained. Hydrogen storage is not yet economically viable at grid scale.

The Policy Gap

This is ultimately a governance and investment problem as much as a technical one. The key issues:

1. Permitting reform — the EU passed emergency permitting rules in 2023 to accelerate grid approvals. Implementation varies dramatically by member state. Poland and Hungary have moved slowly; Germany and Denmark have implemented effectively.
2. Cross-border planning — grid planning remains largely national. A transmission project that makes economic sense across three countries requires three separate permitting processes under three separate legal frameworks.
3. Financing — regulated network businesses operate under return-on-equity frameworks that do not reward the risk-taking required for large, novel infrastructure investments.

The Stakes

The consequences of failing to solve this problem are not abstract. Every gigawatt of renewable capacity that cannot be connected to the grid is a gigawatt that must be replaced by gas or coal. Every year of permitting delay extends the period during which fossil fuels remain necessary. The grid is not a side issue in the energy transition — it is the transition.

This is the first in a series of reports from Brussels and Berlin on the infrastructure gap at the heart of Europe’s climate ambitions.