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Maguire: The solar boom in Europe is masking an increasing strain on the power markets.

Solar power in Europe is soaring to new heights, but the power markets of this region are under increasing stress.

Solar generation in the European Union is on track to break new records this year. Capacity additions are continuing at a rapid pace, and favorable weather conditions have boosted outputs across key markets, such as Germany, Spain, and France.

Solar power now accounts for more than half the midday electricity mix in some areas.

The surge in output is an indication of the success of Europe’s clean energy drive, but it also reveals a growing mismatch between the time when electricity is generated and the time when it is required.

This imbalance is pushing prices down during peak production, which in turn reduces revenues for renewable generators. Grid operators are also forced to curtail their supply.

Europe has learned that producing cheap, clean energy at scale is just part of the problem - capturing their value is much harder.

SOLAR RAPID RISE

There are few comparables to the scale of Europe's expansion in solar power. Solar capacity in both residences and utilities has risen dramatically due to policy support provided by the Green Deal, REPowerEU and falling installation costs.

Spain is a solar powerhouse that exports surplus production to neighbouring markets. Germany, on the other hand, continues to be a leader in distributed solar deployment.

Southern Europe's increased irradiation is accelerating this shift. However, even the northern markets are experiencing strong growth.

This results in a system that is increasingly shaped and influenced by the daily solar production profile. There are sharp spikes around noon, followed by steep drops in the evening.

Especially in areas with limited storage or interconnection, the midday production sometimes exceeds local demand.

CAPTURE LOSS

The power price is being reshaped by this. Solar's capture rate, or the price that it earns in relation to wholesale prices on average, is declining across Europe.

It's simple: When solar overwhelms the grid at peak hours, the prices are depressed. In extreme situations, prices can turn negative. This means generators have to pay in order to remain online.

LSEG data show that the average capture price during the first six months of 2026 - across Germany, France and the Netherlands as well as Belgium, Italy, Spain, is down by 42% compared with the same period in 2023.

The implications for solar developers and utilities are huge. The production of solar panels does not guarantee a rise in revenue. Each additional megawatt of power cannibalizes existing production.

Merchant projects, or those exposed to wholesale markets, are particularly vulnerable. Even projects that are contracted feel the pressure as counterparties hesitate to lock in prices for long-term in a volatile market.

CUTTING GROWTH

Grid constraints force operators to waste more clean electricity.

In high-solar areas, curtailment is more common. It has reached record levels in Germany and Spain in 2026.

According to LSEG, in May, Germany's energy firms cut back on solar output by an estimated 1,28 terawatt-hours (TWh), while utilities in Spain curtailed more than 2.4 TWh.

When prices drop below zero, many producers will simply stop production rather than lose money.

UTILITY STRAIN

Solar boom has become a double-edged blade for utilities.

One side of the equation is that renewable energy generation continues to grow rapidly. This supports decarbonization and asset growth over time. The revenue profile for these assets is also deteriorating.

The price of power is becoming more volatile. There are deep troughs in sunny hours, and sharp peaks when there are low renewable output periods.

This volatility is good for flexible generation, such as hydro, gas and storage, but can be a problem for solar-heavy portfolios.

Utilities respond by investing in balance and flexibility services and seeking to increase revenue stability via power purchase agreements.

These strategies do not fully offset the structural decline of capture prices.

FLEXIBLE FIX

Too much solar is not the problem, but rather too little flexibility.

Battery storage is growing rapidly, but it's not at the scale required to absorb midday excesses.

The demand-side response is still underdeveloped. Industrial consumption remains relatively rigid, and new sources of demand such as heat pumps and electric vehicles are not fully optimized to balance the grid.

Another bottleneck is the expansion of transmission. To move power from "surplus regions" in the south, to the demand centers of the north, requires major infrastructure investment that is often slowed down by permit delays and public resistance.

The system will struggle until these gaps are filled to convert the growing renewable energy into valuable and usable electricity.

This creates a balancing act for policymakers.

Europe cannot afford to delay its solar rollout in order to achieve climate targets and reduce its dependence on imported fossil fuels.

Adding capacity to grids without improving storage, market design and grids risks undermining economics.

There are many potential solutions, such as incentives for co-located energy storage, reforms in electricity pricing and stronger signals to encourage flexible demand.

Implementing them at scale and quickly enough to keep up with solar growth remains a challenge.

The continent has mostly solved the problem of producing clean electricity at scale and low cost. Next comes the harder part: integrating that power into an existing system.

If flexibility, infrastructure and market structures do not evolve simultaneously, the paradox will become worse - cleaner power but with less value per unit produced.

Or, to put it another way, Europe's solar power is not limited by the amount it can produce. It is only constrained by its ability to use it effectively when all of it arrives at once.

These are the opinions of the columnist, who is also an author. This column is great! Open Interest (ROI) is your new essential source of global financial commentary. Follow ROI on LinkedIn, X and X. Listen to the Morning Bid podcast daily on Apple, Spotify or the app. Subscribe to the Morning Bid podcast and hear journalists discussing the latest news in finance and markets 7 days a weeks.

(source: Reuters)